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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K

☒ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2021
or

☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _____________________________ to _____________________________
Commission file number: 0-18953
AAON, INC.
(Exact name of registrant as specified in its charter)

| Nevada | 87-0448736 |
| (State or other jurisdiction | (IRS Employer |
| of incorporation or organization) | Identification No.) |
| 2425 South Yukon Ave., | Tulsa, | Oklahoma | 74107 |  |
(Address of principal executive offices) (Zip Code) |

Registrant’s telephone number, including area code: (918) 583-2266
Securities registered pursuant to Section 12(b) of the Act:

Title of each class | Trading Symbol(s) | Name of each exchange on which registered
Common Stock | AAON | NASDAQ

Securities registered pursuant to Section 12(g) of the Act: None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.
☐ Yes ☒ No
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.
☐ Yes ☒ No
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
☒ Yes ☐ No
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).
☒ Yes ☐ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company (as defined in Rule 12b-2 of the Securities Exchange Act of 1934).

Large accelerated filer | ☒ | Accelerated filer | ☐
Non-accelerated filer | ☐ | Smaller reporting company | ☐
|  | Emerging growth company | ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒
Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Act.)
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The aggregate market value of the common equity held by non-affiliates computed by reference to the closing price of registrant’s common stock on the last business day of registrant’s most recently completed second quarter June 30, 2021 was $2,682.9 million based upon the closing price reported for such date on the Nasdaq Global Select Market.
As of February 23, 2022, registrant had outstanding a total of 52,529,320 shares of its $.004 par value Common Stock.
DOCUMENTS INCORPORATED BY REFERENCE
Portions of registrant’s definitive Proxy Statement to be filed in connection with the 2022 Annual Meeting of Stockholders to be held May 12, 2022, incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein.

TABLE OF CONTENTS
Item Number and Caption | Page Number
PART I |  |  |
| 1. | Business. | 1
| 1A. | Risk Factors. | 9
| 1B. | Unresolved Staff Comments. | 14
| 2. | Properties. | 14
| 3. | Legal Proceedings. | 15
| 4. | Mine Safety Disclosure. | 15
PART II |  |  |
| 5. | Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities. | 15
| 6. | Reserved. | 18
| 7. | Management’s Discussion and Analysis of Financial Condition and Results of Operations. | 18
| 7A. | Quantitative and Qualitative Disclosures About Market Risk. | 31
| 8. | Financial Statements and Supplementary Data. | 32
| 9. | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure. | 70
| 9A. | Controls and Procedures. | 70
| 9B. | Other Information. | 73
PART III |  |  |
| 10. | Directors, Executive Officers and Corporate Governance. | 73
| 11. | Executive Compensation. | 73
| 12. | Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters. | 73
| 13. | Certain Relationships and Related Transactions, and Director Independence. | 73
| 14. | Principal Accountant Fees and Services. | 73
PART IV |  |  |
| 15. | Exhibits and Financial Statement Schedules. | 74

Forward-Looking Statements
This Annual Report includes “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Words such as “expects”, “anticipates”, “intends”, “plans”, “believes”, “seeks”, “estimates”, “should”, “will”, and variations of such words and similar expressions are intended to identify such forward-looking statements. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions, which are difficult to predict. Therefore, actual outcomes and results may differ materially from what is expressed or forecasted in such forward-looking statements. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date on which they are made. We undertake no obligations to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise. Important factors that could cause results to differ materially from those in the forward-looking statements include (1) the timing and extent of changes in raw material and component prices, (2) the effects of fluctuations in the commercial/industrial new construction market, (3) the timing and extent of changes in interest rates, as well as other competitive factors during the year, (4) general economic, market or business conditions, and (5) the correction of certain of our previously issued consolidated financial statements, which may affect investor confidence and raise reputational issues.
PART I
Item 1. Business.
Overview
AAON, Inc., a Nevada corporation, (“AAON Nevada”) was incorporated on August 18, 1987. Our operating subsidiaries include AAON, Inc., an Oklahoma corporation ("AAON Oklahoma"), AAON Coil Products, Inc., a Texas corporation ("AAON Coil Products"), and BasX, Inc. (dba BasX Solutions, formerly BasX, LLC), an Oregon corporation ("BasX"). Unless the context otherwise requires, references in this Annual Report to “AAON”, the “Company”, “we”, “us”, “our”, or “ours” refer to AAON Nevada and our subsidiaries.
We are engaged in the engineering, manufacturing, marketing, and sale of premium air conditioning and heating equipment consisting of standard, semi-custom, and custom rooftop units, data center cooling solutions, cleanroom systems, chillers, packaged outdoor mechanical rooms, air handling units, makeup air units, energy recovery units, condensing units, geothermal/water-source heat pumps, coils, and controls.
Business Segments
The Company conducts its business through three business segments: AAON Oklahoma, AAON Coil Products, and BasX.
AAON Oklahoma: AAON Oklahoma designs, manufactures, sells, and services standard, semi-custom, and custom heating, ventilation, and air conditioning ("HVAC") systems, designs and produces controls solutions for all of our HVAC units, and sells retail parts to customers through our two retail part stores in Tulsa, Oklahoma. Through our Norman Asbjornson Innovation Center ("NAIC") research and development laboratory facility in Tulsa, Oklahoma, the Company is able to test units under various environmental conditions. AAON Oklahoma includes the operations of our Tulsa, Oklahoma and Parkville, Missouri facilities, our NAIC research and development laboratory facility and two retail parts locations.
AAON Coil Products: AAON Coil Products designs and manufactures a selection of our standard, semi-custom, and custom HVAC systems. In addition, AAON Coil Products designs and manufactures various heating and cooling coils to be used in HVAC systems, mostly for the benefit of AAON Oklahoma and AAON Coil Products. AAON Coil Products consists of operations at our Longview, Texas facilities.
BasX: BasX provides product development design and manufacturing of custom engineered air handling systems including high efficiency data center cooling solutions, cleanroom HVAC systems, commercial/industrial HVAC systems, and modular solutions. Additionally, BasX designs and manufactures cleanroom environmental control systems to support hospital surgical suites, pharmaceutical process facilities, semiconductor and electronics manufacturing, laboratory and isolation and modular cleanrooms for facility flexibility. BasX consists of operations at our Redmond, Oregon facility.
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For more information on our business segments' financial position and results of operations, refer to Note 23, "Segments," of the notes to consolidated financial statements.
Business and Marketing Strategy
Our products serve the commercial, industrial, data center cooling solutions, and cleanroom new construction and replacement markets within the HVAC equipment industry. Our business strategy involves mass customization that uses flexible computer-aided manufacturing systems to produce standard, semi-custom, and custom equipment and combines the low unit costs of mass production processes with the flexibility of individual customization. Through a collaborative effort with our independent representative sales offices, we design and manufacture the precise semi-custom product offering that best serves the customer's needs.
Our marketing strategy focuses on customers and markets that demand HVAC equipment with higher performance, greater energy efficiency, and best indoor air quality. We manufacture equipment with more capabilities than the standard offerings found in the HVAC equipment industry. We further focus on developing a company culture focused upon customer satisfaction, reducing product delivery channel time and cost, and continuing with the goal of product and manufacturing technology leadership and innovation. Our product mix, with a heavy investment in research and development, has an emphasis on energy efficiency, environment, and indoor air quality.
Products - AAON Oklahoma and AAON Coil Products
Our rooftop and condensing unit markets primarily consist of units installed on commercial or industrial structures of generally less than ten stories in height. Our air handling units, self-contained units, geothermal/water-source heat pumps, chillers, and coils are suitable for all sizes of commercial and industrial buildings.
The size of these markets is determined primarily by the number of commercial and industrial building completions and replacement demand from existing buildings. The replacement market consists of products installed to replace existing units/components that are worn or damaged and products to upgrade certain components, such as low leakage dampers, high efficiency heat exchangers and modern controls components. Currently, close to two-thirds of the industry’s market consists of replacement units.
The commercial and industrial new construction market is subject to cyclical fluctuations in that it is generally tied to housing starts and the general economy, but has a lag factor of six to 18 months. Housing starts, in turn, are affected by such factors as interest rates, the state of the economy, population growth and the relative age of the population. When new construction is down, we emphasize the replacement market.
Based on our 2021 combined sales of $530.4 million at AAON Oklahoma and AAON Coil Products, we estimate that we have approximately a 10% share of the greater than five ton rooftop market and a 2% share of the less than five ton market. During 2021, approximately 60% of our sales were generated from the renovation and replacement markets and 40% from new construction. The ratio of sales for new construction vs. replacement to particular customers is related to various factors. Generally, the cyclicality of the new construction market impacts this ratio the most over an economic cycle.
To date, our sales have been primarily to the domestic market. Foreign sales accounted for approximately $14.8 million, $11.7 million, and $14.8 million of our net sales in 2021, 2020, and 2019, respectively. As a percentage of net sales, foreign sales accounted for approximately 3%, 2%, and 3% of our net sales in each of those years, respectively.
We purchase certain components, fabricate sheet metal and tubing and then assemble and test the finished products. Our primary finished products consist of a single unit system containing heating and cooling in a self-contained cabinet, referred to in the industry as “unitary products”. Our other finished products are chillers, coils, air handling units, condensing units, makeup air units, energy recovery units, rooftop units, geothermal/water-source heat pumps, and controls.
We offer three groups of rooftop units: the RQ Series, consisting of five cooling sizes ranging from two to six tons; the RN Series, offered in 28 cooling sizes ranging from six to 140 tons; and the RZ Series, which is offered in 15 cooling sizes ranging from 45 to 261 tons.
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We also offer the SA, SB and M2 Series as indoor packaged, water-cooled or geothermal/water-source heat pump self-contained units with cooling capacities of three to 70 tons.
Our small packaged geothermal/water-source heat pump units consist of the WH Series horizontal configuration and WV Series vertical configuration, from one-half to 12 1/2 tons, with options specifically for the replacement market and the new construction market. The replacement systems are designed to be installation friendly for most competitor water source heat pump models.
We manufacture an LF Series air-cooled chiller covering a range of four to 55 tons.
We offer two groups of condensing units: the CB Series, two to five tons and the CF Series, two to 70 tons.
Our air handling units consist of the indoor F1, H3, and V3 Series and the modular M2 Series, as well as air handling unit configurations of the RQ, RN, RZ, and SA Series units.
AAON is committed to designing and manufacturing innovative HVAC products of the highest quality, efficiency, and performance. As such, we are committed to meeting certification standards of the relevant standard setting bodies, including the Air-Conditioning, Heating, and Refrigeration Institute (“AHRI”); the American National Standards Institute ("ANSI"); American Society of Heating, Refrigeration and Air-Conditioning Engineers ("ASHRAE"); and the International Organization for Standardization ("ISO").
Our energy recovery option applicable to our RQ, RN, RZ, and SB units, as well as our H3, V3, and M2 Series air handling units, responds to the U.S. Clean Air Act mandate to increase fresh air in commercial structures. Our products are designed to compete on the higher quality end of standardized products.
Our air-cooled chillers (LF Series) are certified with the AHRI in accordance with AHRI Standard 550/590. Our RN, RQ, M2, and SB Series, including our water-source heat pump products (WH, and WV Series), are AHRI certified in accordance with ANSI/AHRI/ASHRAE/ISO 13256.
Our unitary products (RQ, RN, and CB Series) are certified with AHRI and the US Department of Energy to ANSI/AHRI 210/240 up to 5 tons capacity and ANSI/AHRI 340/360 up to 63 tons capacity.
Performance characteristics of our products range in cooling capacity from one-half to 261 tons and in heating capacity from 7,200 to 4,500,000 British Thermal Units ("BTUs"). Many of our units far exceed these minimum standards and are among the highest efficiency units currently available.
A typical commercial building installation requires one ton of air conditioning for every 300-400 square feet or, for a 100,000 square foot building, 250 tons of air conditioning, which can involve multiple units.
Our water-source heat pump products recover otherwise wasted energy and employ it to cool, heat, and provide dehumidification to a building, making it one of the most efficient and environmentally friendly systems. AAON packaged rooftop units with two stage compressors are optimized with high efficiency evaporator and condenser coils and variable speed fans, leading to an AHRI Certified performance up to 20.3 SEER and 22.5 IEER. AAON H3/V3 Series energy recovery wheel air handling units provide energy efficient 100% outside air ventilation by recovering energy that would otherwise be exhausted from a building.
AAON designs and produces controls solutions for all of our HVAC units including rooftop units, air handlers, chillers, and water-source heat pumps. We provide factory-developed and tested controls options for variable air volume systems associated with those units and other HVAC related equipment.
We offer several controls options: the Orion Controller, Pioneer Gold, Pioneer Silver, terminal block for field installed controls, and factory installed customer provided controls. Most of our controls are Underwriters Laboratories category ZPVI2 compliant and BACnet Testing Laboratories certified which ensures our products meet internationally recognized standards for safety, traceability, conformance, and production quality. Our economizer function is California Title 24 certified to minimize energy consumption. AAON’s proven sequences of operation optimize the performance of our HVAC units.
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Out of the box, our controls are user-friendly and configurable to provide a variety of HVAC unit application options, but we are also able to customize our controls to meet customers’ unique requirements. We have controls solutions that enhance AAON’s unique features and capabilities.
Products - BasX
The acquisition of BasX brings the Company exposure to attractive end-markets into which the Company has historically had minimal exposure. The products BasX manufactures are highly engineered and customized products, fully complementing our existing business.
BasX data center cooling solutions are focused on providing highly configurable, purpose-built equipment with a focus on efficiency, speed of deployment, and quality. High-performance air-cooled chiller solutions are provided with indirect airside economization and optional adiabatic assisted cooling, and are designed to integrate with high performance computing systems requiring direct to chip cooling. White space process cooling solutions include fan coil walls, computer room air handling ("CRAH") units, overhead fan coils, in-row coolers, and chilled water air handlers. Packaged solutions include coupled economizing chillers with integrated air handling units, direct evaporative coolers, and packaged direct expansion ("DX") solutions with airside economizers.
BasX cleanroom products are built to provide environmental control serving critical processes and high-fidelity control for precise industry requirements. Process cooling solutions include recirculation air handling units and make up air handling units including integration of piping systems and controls. Environmental control solutions include modular cleanroom environments, fan filter units, filtered ceiling grids with integral flush mount lighting, pressurized plenums with integral ceiling grids, and hospital surgical suites.
BasX custom air handling products are primarily used in commercial, industrial, healthcare, and institutional facilities employing chilled water cooling, packaged direct expansion, heating hot water, indirect gas direct heat, humidification, dehumidification, filtration, and integrated controls. BasX manufactures plenum fans for integration into air handling units as well as for replacement applications. BasX offers integrated sound performance solutions.
Air Quality Products
The Coronavirus Disease 2019 ("COVID-19") pandemic has fueled a great deal of concern over best practices in the design and operation of building HVAC systems. In order to mitigate the spread of COVID-19, influenza, and other similar type respiratory diseases, we have done a great deal of research on what affects the transmission of these diseases and how AAON HVAC systems can be best designed. The American Society of Heating, Refrigeration and Air-Conditioning Engineers ("ASHRAE"), a professional association with a goal of advancing HVAC systems designs and construction, established an Epidemic Task Force in 2020 and determined several recommendations to mitigate the spread of the virus, including humidity control, air filtration, increased outdoor air ventilation, and air disinfection.
Humidity control - AAON continues to lead the market in developing energy efficient humidity control with the use of variable capacity compressors and modulating hot gas reheat. Designing HVAC systems with superior humidity control allows building management to maintain ASHRAE’s recommended ambient relative humidity levels of 40%-60%, the ideal level to inactivate viruses in the air and on surfaces.
Air Filtration - AAON standardizes a design that uses a backward curved fan wheel, which can accommodate higher airflow required for the ASHRAE recommended MERV 13 filtration, the minimum filter level for virus mitigation, with very little reconfiguration. Prior to 2020, a vast majority of commercial buildings used filtration levels of MERV 4 to MERV 8, which has always been acceptable for filtering out typical particulates in the air stream.
Outdoor Air Ventilation - AAON’s innovative use of energy recovery wheels and energy recovery plates combined with its superior humidity control design can help building management follow outdoor ventilation air recommendations while limiting an increase of energy usage and maintaining recommended humidity levels.
Air Disinfection - AAON has basic design characteristics that allow for an easy installation of ultraviolet lighting equipment. In addition to this equipment offered as options in new AAON units sold, AAON has basic design characteristics that allow for easy installation in AAON units already used in the field.
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Overall, AAON is well positioned to accommodate the heightened demand for features that can help mitigate virus transmission and improve indoor air quality. The features that ASHRAE recommends require premium designs and configurations that are standard in AAON units. As a result, we are able to incorporate air quality features into our units, at a minimal price premium and with no delivery delay.
Representatives
As of December 31, 2021, we employ a sales staff of 65 individuals and utilize approximately 64 independent manufacturer representatives’ organizations (“Representatives”) having 128 offices to market our products in the United States and Canada. We also have one international sales organization, which utilizes 28 distributors in other countries. Sales are made directly to the contractor or end user, with shipments being made from our Tulsa, Oklahoma, Longview, Texas, Parkville, Missouri, or Redmond, Oregon facilities to the job site.
Historically, our products and sales strategy focused on niche markets. However, secular market trends related to the pandemic and indoor air quality, decarbonization and energy efficiency, and higher energy prices, have positioned the Company to focus on a wider spectrum of the nonresidential HVAC equipment industry. The targeted markets for our equipment are customers seeking products of higher performance and better quality than those offered, and/or options not offered, by standardized manufacturers.
To support and service our customers and the ultimate consumer, we provide parts availability through our Representatives' sales offices, as well as our two Tulsa, Oklahoma AAON operated retail parts stores, to serve the local markets. We also have factory service organizations at each of our facilities. Additionally, a number of the Representatives we utilize have their own service organizations, which, in connection with us, provide the necessary warranty work and/or normal service to customers.
Warranties
Our product warranty policy is the earlier of one year from the date of first use or 18 months from date of shipment for parts only, including controls; 18 months for data center cooling solutions and cleanroom systems; five years for compressors (if applicable); 15 years on aluminized steel gas-fired heat exchangers (if applicable); 25 years on stainless steel heat exchangers (if applicable); and ten years on gas-fired heat exchangers in our historical RL products (if applicable). Our warranty policy for the RQ series covers parts for two years from date of unit shipment. Our warranty policy for the WH and WV Series geothermal/water-source heat pumps covers parts for five years from the date of installation.
The Company also sells extended warranties on parts for various lengths of time ranging from six months to ten years. Revenue for these separately priced warranties is deferred and recognized on a straight-line basis over the separately priced warranty period.
Major Customers
One customer, Texas AirSystems, accounted for 10% or more of our sales during 2021, 2020, and 2019. No other customer accounted for more than 10% of our sales during 2021, 2020, and 2019.
Backlog
Our backlog as of February 1, 2022 was approximately $347.6 million, compared to approximately $103.8 million as of February 1, 2021. The current backlog consists of orders considered by management to be firm and our goal is to fill orders within approximately 60 to 90 days after an order is deemed to become firm; however, the orders are subject to cancellation by the customers in which case, cancellation charges apply up to the full price of the equipment.
Competition
At AAON Oklahoma and AAON Coil Products, we compete primarily with Lennox (Lennox International, Inc.), Trane (Trane Technologies plc), York International (Johnson Controls International plc), Carrier (Carrier Global Corporation), and Daikin (Daikin Industries). At BasX, we compete primarily with Vertiv (Vertiv Holdings Co.), STULZ (STULZ Air Technology Systems, Inc.), Munters, Silent Aire (Johnson Controls Internations plc), Nortek (Nortek Air Management), and Engineered Air.
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All of these competitors are substantially larger and have greater resources than we do. Our products compete on the basis of total value, quality, function, serviceability, efficiency, availability of product, reliability, product line recognition, and acceptability of sales outlets. Historically, our premium equipment was sold at a higher average price compared to most of the competition. In the replacement market and other owner-controlled purchases, we have been successful at taking market share due to the total value proposition and lower cost of ownership our products provide to building owners over the life span of the equipment. In the new construction market where the contractor is the purchasing decision maker, we were often at a competitive disadvantage because of the emphasis placed on initial cost. However, due to operational efficiency improvements we have made over the last several years, we have been able to manage pricing so that the cost of our semi-custom equipment is more comparable to the standard equipment market. As a result, the value proposition of our higher quality equipment is more attractive, making us more competitive in both the new construction and replacement markets.
Resources
Sources and Availability of Raw Materials
The most important materials we purchase are steel, copper, and aluminum. We also purchase from other manufacturers certain components, including coils, compressors, electric motors, and electrical controls used in our products. We attempt to obtain the lowest possible cost in our purchases of raw materials and components, consistent with meeting specified quality standards. We are not dependent upon any one source for raw materials or the major components of our manufactured products. By having multiple suppliers, we believe that we will have adequate sources of supplies to meet our manufacturing requirements for the foreseeable future.
We attempt to limit the impact of price fluctuations on these materials by entering into cancellable and non-cancellable fixed price contracts with our major suppliers for periods of six to 18 months. We expect to receive delivery of raw materials from our fixed price contracts for use in our manufacturing operations.
We have not been significantly impacted by the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”) that contains provisions to improve transparency and accountability concerning the supply of certain minerals, known as “conflict minerals”, originating from the Democratic Republic of Congo and adjoining countries.
Working Capital Practices
Working capital practices in the industry center on inventories and accounts receivable. Our management regularly reviews our working capital with a view of maintaining the lowest level consistent with requirements of anticipated levels of operation. Our greatest needs arise during the months of May - October, the peak season for inventory (primarily purchased material) and accounts receivable. Our working capital requirements are generally met by cash flow from operations and a bank revolving credit facility, which currently permits borrowings up to $100.0 million and had a $40.0 million outstanding balance at December 31, 2021. Borrowings available under the revolving credit facility at December 31, 2021, were $58.2 million. We believe that we will have sufficient funds available to meet our working capital needs for the foreseeable future.
Research and Development
Our products are engineered for performance, flexibility, and serviceability. This has become a critical factor in competing in the HVAC equipment industry. We must continually develop new and improved products in order to compete effectively and to meet evolving regulatory standards in all of our major product lines.
AAON self-sponsors our Research and Development (“R&D”) activities, rather than needing to be customer-sponsored. R&D activities have involved the RQ, RN, and RZ (rooftop units), F1, H3, SA, V3, and M2 (air handling units), LF (chillers), CB and CF (condensing units), SA and SB (self-contained units), and WH and WV (water-source heat pumps), as well as component evaluation and refinement, development of control systems and new product development. R&D expenses incurred were approximately $16.6 million, $17.4 million, and $14.8 million in 2021, 2020, and 2019, respectively.
Our NAIC research and development laboratory facility that opened in 2019, includes many unique capabilities, which, to our knowledge, exist nowhere else in the world. A few features of the NAIC include supply, return, and
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outside sound testing at actual load conditions, testing of up to a 300 ton air conditioning system, up to a 540 ton chiller system, and 80 million BTU/hr of gas heating test capacity. Environmental application testing capabilities include -20 to 140°F testing conditions, up to 8 inches per hour rain testing, up to 2 inches per hour snow testing, and up to 50 mph wind testing. We believe we have the largest sound-testing chamber in the world for testing heating and air conditioning equipment and are not aware of any similar labs that can conduct this testing while putting the equipment under full environmental load. The unique capabilities of the NAIC will enable AAON to lead the industry in the development of quiet, energy efficient commercial and industrial heating and air conditioning equipment.
The NAIC currently houses twelve testing chambers. These testing chambers allow AAON to meet and maintain AHRI and U.S. Department of Energy ("DOE") certification and solidify the Company’s industry position as a technological leader in the manufacturing of HVAC equipment. Current voluntary industry certification programs and government regulations only go up to 63 tons of air conditioning as that is the largest environmental chamber currently available for testing outside of our facility. The NAIC contains both a 100 ton and a 540 ton chamber, allowing us to uniquely prove to customers our capacity and efficiency on these larger units.
The NAIC was designed to test units well beyond the standard AHRI rating points and allows us to offer testing services on AAON equipment throughout our range of product application. This capability is vital for critical facilities where the units must perform properly and allows our customers to verify the performance of our units in advance, rather than after installation. These same capabilities will enable AAON to develop a new extended range of operation equipment and prove its capabilities.
In 2021, we invested in our first Electronic Prototype Lab at our Parkville, Missouri, location. This lab allows the AAON Controls Engineering team to experiment with new technology and create its own prototypes. A pick-and-place machine gives us the ability to place the latest components quickly, accurately, and reliably. The Electronic Prototype Lab allows AAON to increase speed to market and incorporate cutting-edge technology into our controls offering.
Patents, Trademarks, Licenses, and Concessions
We do not consider any patents, trademarks, licenses, or concessions to be material to our business operations, other than those described below.
We hold several patents that relate to the design and use of our products. We consider these patents important, but no single patent is material to the overall conduct of our business. We proactively obtain patents to further our strategic intellectual property objectives. We own certain trademarks we consider important in the marketing of our products and services, and we protect our marks through national registrations and common law rights. Our patents have legal terms of 20 years with expiration dates ranging from 2022 to 2039.
The Company’s trademarks, certain of which are material to its business, are registered or otherwise legally protected in the U.S.
Seasonality
Sales of our products are moderately seasonal with the peak period being May-October of each year due to timing of construction projects being directly related to warmer weather.
Environmental & Regulatory Matters
Laws concerning the environment that affect or could affect our operations include, among others, the Clean Water Act, the Clean Air Act, the Resource Conservation and Recovery Act, the Occupational Safety and Health Act, the National Environmental Policy Act, the Toxic Substances Control Act, regulations promulgated under these Acts and any other federal, state or local laws or regulations governing environmental matters. We believe that we are in compliance with these laws and that future compliance will not materially affect our earnings or competitive position.
Since our founding in 1987, AAON has maintained a commitment to design, develop, manufacture, and deliver heating and cooling products to perform beyond all expectations and to demonstrate AAON’s quality and value to our customers. AAON equipment is designed with energy efficiency in mind, without sacrificing premium features
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and options. In addition to our high standard of product performance, is a commitment to sustainability for our employees, our stockholders, and our customers. At AAON, we strive to conduct our business in a socially responsible and ethical manner with a focus on environmental stewardship, team member safety and community engagement. We comply with industry regulations and requirements while pursuing responsible economic growth and profitability.
In 2021, we published our third annual environmental, social, and governance ("ESG") report highlighting sustainability practices, achievements, and long-term targets related to greenhouse gas emissions, hazardous waste recycling, and non-fossil fuel consuming products. AAON also participates in a sustainability benchmarking initiative (Sustainable Tulsa Scor3card) through which we monitor and report in the material areas of energy, material management, water, community stewardship, transportation, communication, and health. AAON achieved Platinum level in this program in 2021. We have an active ESG committee and an internal sustainability committee that provides education opportunities, communications and recommendations to the company on a regular basis.
In the area of energy efficiency and conservation, AAON Oklahoma and AAON Coil Products have transitioned to over 95% LED lighting in our facilities leading to considerable cost savings and reduced energy consumption. BasX is installing LED lights into any new fixtures in their current leased facility and working towards retrofitting old fixtures to LED. The Company participates in an energy demand response program through the public utility provider to reduce demand during peak hours. Approximately one-quarter of AAON’s energy portfolio is currently derived from renewable sources, and the Company’s Scope 1 and 2 emissions (emissions that occur from sources that are controlled or owned by an organization and emissions associated with the purchase of electricity, steam, heat, or cooling) are being tracked as part of the Scor3card sustainability benchmarking initiative. Energy efficiency has been a priority not only in product development, but also in capital investments which include the acquisition of new, energy efficient equipment for the production floor, new high-speed overhead facility doors, the installation of new HVAC equipment, building control systems, the application of heat and light reflective material to production facilities, along with other behavioral-based energy efficiency changes. We are tracking our energy usage intensity before and after these updates.
In the area of material management, we focus on recycling, reducing, reusing and sourcing more environmentally-friendly materials into our processes. AAON recycled over 13,793 tons and 11,741 tons of metal in 2021 and 2020, respectively. Through our partnership with a waste to energy facility, we successfully diverted over 460 tons and 556 tons of waste from landfills in 2021 and 2020, respectively. Our facilities also recycle paper, wood, and cardboard where available. We continue to innovate ways to reduce and reuse shipping packaging between facilities and identify new opportunities to reduce or reuse items in our production and administrative areas.
Human Capital Resources
Our employees are not represented by unions or other collective bargaining agreements. Management considers its relations with our employees to be good. The following table represents the number of our direct employees and contract personnel we employed on each respective date:

| As of |  | As of |  | As of |  |
| February 22, 2022 |  | February 23, 2021 |  | February 21, 2020 |  |
AAON Oklahoma | 1,979 |  |  | 1,778 |  | 1,889 |  |
AAON Coil Products | 574 |  |  | 490 |  | 401 |  |
BasX 1 | 328 |  |  | — |  |  | — |  |  |
Total employees | 2,881 |  |  | 2,268 |  |  | 2,290 |  |  |
1 BasX was acquired by the Company on December 10, 2021. |  |

We believe our employees are key to achieving our business objectives. In the early stages of the COVID-19 pandemic, we put COVID-19 prevention protocols in place to minimize the spread of COVID-19 in our workplaces. These protocols, which remain in place, meet or exceed state and local mandates.
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Our key human capital measures include employee safety, turnover, absenteeism, and production. We frequently benchmark our compensation practices and benefits programs against those of comparable industries and in the geographic areas where our facilities are located. We believe that our compensation and employee benefits are competitive and allow us to attract and retain skilled and unskilled labor throughout our organization. Some of our notable health, welfare, and retirement benefits include:
•Employee medical plan (with 175% employer health saving plan match)
•401(k) Plan (with 175% employer match)
•Profit sharing bonus plan
•Tuition assistance program
•Paid time off
Available Information
Our Internet website address is http://www.aaon.com. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, will be available free of charge through our Internet website as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. The information on our website is not a part of, or incorporated by reference into, this annual report on Form 10-K.
Copies of any materials we file with the SEC can also be obtained free of charge through the SEC’s website at http://www.sec.gov, at the SEC’s Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549, or by calling the SEC at 1-800-732-0330.
Item 1A. Risk Factors.
The following risks and uncertainties may affect our performance and results of operations. The discussion below contains “forward-looking statements” as outlined in the Forward-Looking Statements section above. Our ability to mitigate risks may cause our future results to materially differ from what we currently anticipate. Additionally, the ability of our competitors to react to material risks will affect our future results.
Risks Related to the Covid-19 Pandemic
Our business, results of operations, financial condition, cash flows, and stock price can be adversely affected by pandemics, epidemics, or other public health emergencies, such as COVID-19.
Our business, results of operations, financial condition, cash flows, and stock price can be adversely affected by pandemics, epidemics, or other public health emergencies, such as COVID-19. In March 2020, the World Health Organization characterized COVID-19 as a pandemic, and the President of the United States declared the COVID-19 outbreak a national emergency. The outbreak has resulted in governments around the world implementing increasingly stringent measures to help control the spread of the virus, including quarantines, “shelter in place” and “stay at home” orders, travel restrictions, business curtailments, school closures, vaccination or testing mandates and other measures. In addition, governments and central banks in several parts of the world have enacted fiscal and monetary stimulus measures to counteract the impacts of COVID-19.
We are considered a critical infrastructure industry, as defined by the U.S. Department of Homeland Security. Although we have continued to operate our facilities to date consistent with federal guidelines and state and local orders, the outbreak of COVID-19 and any preventive or protective actions taken by governmental authorities may have a material adverse effect on our operations, supply chain, customers, and transportation networks, including business shutdowns or disruptions. While we do continue to operate, during 2021 we experienced price increases in our raw materials, especially copper and steel, which appear to be a result of COVID-19, as well supply chain challenges related to certain manufacturing parts.
The extent to which COVID-19 may adversely impact our business depends on future developments, which are highly uncertain and unpredictable, depending upon the severity and duration of the outbreak and the effectiveness of actions taken globally to contain or mitigate its effects. Any resulting financial impact cannot be estimated reasonably at this time, but may materially adversely affect our business, results of operations, financial condition, and cash flows. Even after the COVID-19 pandemic has subsided, we may experience materially adverse impacts to our business due to any resulting economic recession or depression. Additionally, concerns over the economic
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impact of COVID-19 have caused extreme volatility in financial and other capital markets which may adversely impact our stock price and our ability to access capital markets. To the extent the COVID-19 pandemic adversely affects our business and financial results, it may also have the effect of heightening many of the other risks described in this Annual Report, such as those relating to our products and financial performance.
Risks Related to Our Business
Our business can be hurt by economic conditions.
Our business is affected by a number of economic factors, including the level of economic activity in the markets in which we operate. Sales in the commercial and industrial new construction markets correlate to the number of new homes and buildings that are built, which in turn is influenced by cyclical factors such as interest rates, inflation, consumer spending habits, employment rates, and other macroeconomic factors over which we have no control. In the HVAC business, a decline in economic activity as a result of these cyclical or other factors typically results in a decline in new construction and replacement purchases which could impact our sales volume and profitability.
Our results of operations and financial condition could be negatively impacted by the loss of a major customer.
From time to time in the past we derived a significant portion of our sales from a limited number of customers, and such concentration may continue in the future. In 2021, 2020, and 2019, one customer, Texas AirSystems, accounted for more than 10% of our sales. The loss of, or significant reduction in sales to, a major customer could have a material adverse effect on our results of operations, financial condition and cash flow. Further, the addition of new major customers in the future could increase our customer concentration risks as described above.
Our results of operations and financial condition could be negatively impacted by the loss of a major third-party representative.
We are dependent on our third-party representatives to market and sell our products. If such relationships were terminated for any reason, it could materially and adversely affect our ability to generate revenues and profits. Certain of our competitors with greater financial resources than us could target our third-party representatives for exclusive sales channels. We may not be able to secure additional third-party representatives who will effectively market our products in certain geographical areas. In addition, adding new representatives requires additional administrative efforts and costs. If we are unable to establish new representative relationships or continue current relationships, our business, financial condition, and results of operations could be materially and adversely affected.
We may incur material costs as a result of warranty and product liability claims that would negatively affect our profitability.
The development, manufacture, sale and use of our products involve a risk of warranty and product liability claims. Our product liability insurance policies have limits that, if exceeded, may result in material costs that would have an adverse effect on our future profitability. In addition, warranty claims are not covered by our product liability insurance and there may be types of product liability claims that are also not covered by our product liability insurance.
We depend on our senior leadership team and the loss of our chief executive officer or one or more key employees or an inability to attract and retain highly skilled employees could adversely affect our business.
Our success depends largely upon the continued services of our officers and senior leadership team. In particular, our chief executive officer, Gary D. Fields, is critical to our vision, strategic direction, culture, and overall business success. Furthermore, Mr. Fields' extensive industry knowledge and sales-channel experience would be difficult to replace. We also rely on our senior leadership team in the areas of research and development, marketing, production, sales, and general and administrative functions. From time to time, there may be changes in our senior leadership team resulting from the hiring or departure of senior leadership team members, which could disrupt our business. While we have have a robust succession plan in place for each one of our officers and senior leadership team members, the loss of one or more could have a serious adverse effect on our business.
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We do not maintain key-man insurance for Gary D. Fields or any other member of our senior leadership team. Other than the employment agreements negotiated with certain employees of BasX, we do not have employment agreements with our officers or senior leadership team members that require them to continue to work for us for any specified period and, therefore, they could terminate their employment with us at any time. The employment agreements with the employees of BasX guarantee certain compensation, such as salary and benefits, and employment terms. We do not believe the terms or conditions of these agreements are outside the standard expectation of another employee at a similar level.
Operations may be affected by natural disasters, especially since most of our operations are performed at a single location.
Natural disasters such as tornadoes, ice storms and fires, as well as accidents, acts of terror, infection, and other factors beyond our control could adversely affect our operations. Our facilities are in areas where tornadoes are likely to occur, and the majority of our operations are at our Tulsa facilities. With the acquisition of BasX in 2021, we now have operations in an area that is, historically, effected by wild fires. The effects of natural disasters and other events could damage our facilities and equipment and force a temporary halt to manufacturing and other operations, and such events could consequently cause severe damage to our business. We maintain insurance against these sorts of events at AAON Oklahoma and AAON Coil Products with $100 million of total coverage with a per occurrence deductible of $2.5 million and BasX with $20 million of total cover with a per occurrence deductible of $5 thousand; however, this is not guaranteed to cover all the losses and damages incurred. Furthermore, we may experience increases in our insurance premium costs in relation to these matters that may have a material adverse effect upon our business, liquidity, financial condition, or results of operations.
If we are unable to hire, develop or retain employees, it could have an adverse effect on our business.
We compete to hire new employees and then seek to train them to develop their skills. We may not be able to successfully recruit, develop, and retain the personnel we need. Unplanned turnover or failure to hire and retain a diverse, skilled workforce, could increase our operating costs and adversely affect our results of operations.
Variability in self-insurance liability estimates could impact our results of operations.
We self-insure for employee health insurance and workers’ compensation insurance coverage up to a predetermined level, beyond which we maintain stop-loss insurance from a third-party insurer for claims over $225,000 and $750,000 for employee health insurance claims and workers’ compensation insurance claims, respectively. Our aggregate exposure varies from year to year based upon the number of participants in our insurance plans. We estimate our self-insurance liabilities using an analysis provided by our claims administrator and our historical claims experience. Our accruals for insurance reserves reflect these estimates and other management judgments, which are subject to a high degree of variability. If the number or severity of claims for which we self-insure increases, it could cause a material and adverse change to our reserves for self-insurance liabilities, as well as to our earnings.
Risks Related to Our Brand and Product Offerings
We may not be able to compete favorably in the highly competitive HVAC business.
Competition in our various markets could cause us to reduce our prices or lose market share, which could have an adverse effect on our future financial results. Substantially all of the markets in which we participate are highly competitive. The most significant competitive factors we face are product reliability, product performance, service, and price, with the relative importance of these factors varying among our product line. Other factors that affect competition in the HVAC market include the development and application of new technologies and an increasing emphasis on the development of more efficient HVAC products. Moreover, new product introductions are an important factor in the market categories in which our products compete. Several of our competitors have greater financial and other resources than we have, allowing them to invest in more extensive research and development. We may not be able to compete successfully against current and future competition and current and future competitive pressures faced by us may materially adversely affect our business and results of operations.
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We may not be able to successfully develop and market new products.
Our future success will depend upon our continued investment in research and new product development and our ability to continue to achieve new technological advances in the HVAC industry. Our inability to continue to successfully develop and market new products or our inability to implement technological advances on a pace consistent with that of our competitors could lead to a material adverse effect on our business and results of operations. Furthermore, our continued investment in new product development may render certain legacy products and components obsolete resulting in increased inventory obsolescence expense that may have a material adverse effect upon our financial condition or results of operations.
Risks Related to Material Sourcing and Supply
We may be adversely affected by problems in the availability, or increases in the prices, of raw materials and components.
Problems in the availability, or increases in the prices, of raw materials or components could depress our sales or increase the costs of our products. We are dependent upon components purchased from third parties, as well as raw materials such as steel, copper and aluminum. Occasionally, we enter into cancellable and non-cancellable contracts on terms from six to 18 months for raw materials and components at fixed prices. However, if a key supplier is unable or unwilling to meet our supply requirements, we could experience supply interruptions or cost increases, either of which could have an adverse effect on our gross profit.
We risk having losses resulting from the use of non-cancellable fixed price contracts.
Historically, we have attempted to limit the impact of price fluctuations on commodities by entering into non-cancellable fixed price contracts with our major suppliers for periods of six to 18 months. We expect to receive delivery of raw materials from our fixed price contracts for use in our manufacturing operations. These fixed price contracts are not accounted for using hedge accounting since they meet the normal purchases and sales exemption.
Risks Related to Electronic Data Processing and Digital Information
Our business is subject to the risks of interruptions by cybersecurity attacks.
We depend upon information technology infrastructure, including network, hardware and software systems to conduct our business. Despite our implementation of network and other cybersecurity measures, our information technology system and networks could be disrupted due to technological problems, a cyber-attack, acts of terrorism, severe weather, a solar event, an electromagnetic event, a natural disaster, the age and condition of information technology assets, human error, or other reasons. To date, we have not experienced a material impact to our business or operations resulting from cyber-security or other similar information attacks, but due to the ever-evolving attack methods, as well as the increased amount and level of sophistication of these attacks, our security measures may not be adequate to protect against highly targeted sophisticated cyber-attacks, or other improper disclosures of confidential and/or sensitive information. Additionally, we may have access to confidential or other sensitive information of our customers, which, despite our efforts to protect, may be vulnerable to security breaches, theft, or other improper disclosure. Any cyber-related attack or other improper disclosure of confidential information could have a material adverse effect on our business, as well as other negative consequences, including significant damage to our reputation, litigation, regulatory actions, and increased cost.
Risks Related to Governmental Regulation and Policies
Exposure to environmental liabilities could adversely affect our results of operations.
Our future profitability could be adversely affected by current or future environmental laws. We are subject to extensive and changing federal, state and local laws and regulations designed to protect the environment in the United States and in other parts of the world. These laws and regulations could impose liability for remediation costs and result in civil or criminal penalties in case of non-compliance. Compliance with environmental laws increases our costs of doing business. Because these laws are subject to frequent change, we are unable to predict the future costs resulting from environmental compliance.
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We are subject to potentially extreme governmental regulations and policies.
We always face the possibility of new governmental regulations, policies and trade agreements which could have a substantial or even extreme negative effect on our operations and profitability. Several intrusive component part governmental regulations are in process. If these proposals become final rules, the effect would be the regulation of compressors and fans in products for which the Department of Energy does not have current authority. This could affect equipment we currently manufacture and could have an impact on our product design, operations, and profitability.
The Dodd-Frank Wall Street Reform and Consumer Protection Act contains provisions to improve transparency and accountability concerning the supply of certain minerals, known as “conflict minerals”, originating from the Democratic Republic of Congo and adjoining countries. As a result, in August 2012, the SEC adopted annual disclosure and reporting requirements for those companies who use conflict minerals in their products. Accordingly, we began our reasonable country of origin inquiries in fiscal year 2013, with initial disclosure requirements beginning in May 2014. There are costs associated with complying with these disclosure requirements, including for due diligence to determine the sources of conflict minerals used in our products and other potential changes to products, processes or sources of supply as a consequence of such verification activities. The implementation of these rules could adversely affect the sourcing, supply, and pricing of materials used in our products. As there may be only a limited number of suppliers offering “conflict free” conflict minerals, we cannot be sure that we will be able to obtain necessary conflict minerals from such suppliers in sufficient quantities or at competitive prices. Also, we may face reputational challenges if we determine that certain of our products contain minerals not determined to be conflict free or if we are unable to sufficiently verify the origins for all conflict minerals used in our products through the procedures we may implement.
Our operations could be negatively impacted by new legislation as well as changes in regulations and trade agreements, including tariffs and taxes. Unfavorable conditions resulting from such changes could have a material adverse effect on our business, financial condition and results of operations.
We are subject to adverse changes in tax laws.
Our tax expense or benefits could be adversely affected by changes in tax provisions, unfavorable findings in tax examinations, or differing interpretations by tax authorities. We are unable to estimate the impact that current and future tax proposals and tax laws could have on our results of operations. We are currently subject to state and local tax examinations for which we do not expect any major assessments.
We are subject to international regulations that could adversely affect our business and results of operations.
Due to our use of representatives in foreign markets, we are subject to many laws governing international relations, including those that prohibit improper payments to government officials and commercial customers, and restrict where we can do business, what information or products we can supply to certain countries and what information we can provide to a non-U.S. government, including but not limited to the Foreign Corrupt Practices Act, U.K. Bribery Act and the U.S. Export Administration Act. Violations of these laws, which are complex, may result in criminal penalties or sanctions that could have a material adverse effect on our business, financial condition and results of operations.
Changes in legislation or government regulations or policies could adversely effect on our results of operations.
Our sales, gross margins and profitability could be directly impacted by changes in legislation or government regulations or policies. Specifically, changes in environmental and energy efficiency standards and regulations related to global climate change are being implemented to curtail the use of hydrofluorocarbons which are used in refrigerants that are essential to many of our products. Our inability or delay in developing or marketing products that match customer demand while also meeting applicable efficiency and environmental standards may negatively impact our results.
We expect to start transitioning to a new refrigerant with lower global warming potential for our HVAC systems in 2023 and must be fully compliant under current governmental regulations by 2025. We expect to incur costs associated with this transition related to the purchase of the new refrigerant as well as additional sensors and
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detectors on our HVAC systems. In addition, we expect to incur cost to our facilities, specifically costs to store and use the new refrigerant in production; however, we do not expect these costs to be significant. Due to the increased flammability of the new refrigerant, the insurance industry may require higher premiums for companies once the conversion begins. Furthermore, due to the expected increased demand of the newer refrigerants as well as the older hydrofluorocarbon refrigerants (as they are phased out), we expect to see increased manufacturing costs related to purchases of refrigerants and could see higher costs for future warranty claims.
Future legislation or regulations relating to environmental policies, product certification, product liability, taxes, amount and availability of tax incentives and other matters, may impact the results of each of our operating segments and our consolidated results.
Item 1B. Unresolved Staff Comments.
None.
Item 2. Properties.
As of December 31, 2021, we own all of our Tulsa, Oklahoma, and Longview, Texas, facilities, consisting of approximately two million square feet of space for office, manufacturing, research and development, warehouse, assembly operations, and parts sales. We believe that our facilities are well maintained and are in good condition and suitable for the conduct of our business. Our Parkville, Missouri and Redmond, Oregon facilities were leased as of December 31, 2021, and as further described below.
Our manufacturing areas are heavy industrial type buildings, with some coverage by overhead cranes, containing manufacturing equipment designed for sheet metal fabrication and metal stamping. The manufacturing equipment contained in the facilities consists primarily of automated sheet metal fabrication equipment, supplemented by presses. Assembly lines consist of cart-type and roller-type conveyor lines with variable line speed adjustment, which are motor driven. Subassembly areas and production line manning are based upon line speed.
AAON Oklahoma
Our plant and office facilities in Tulsa, Oklahoma, consist of a 342,000 sq. ft. building (327,000 sq. ft. of manufacturing/warehouse space and 15,000 sq. ft. of office space) located on a 12-acre tract of land at 2425 South Yukon Avenue, a 940,000 sq. ft. manufacturing/warehouse building and a 70,000 sq. ft. office building located on an approximately 79-acre tract of land across the street from the original facility (2440 South Yukon Avenue), and a 40,000 sq. ft. building used as warehouse space, acquired in 2021, on located on a 6-acre tract (collectively, the “Tulsa facilities”).
In addition to a retail parts store location at our Tulsa facilities, we also own a 13,500 sq. ft. stand alone building (7,500 sq. ft. warehouse and 6,000 sq. ft. office) which is utilized as an additional retail parts store to provide our customers more accessibly to our products. The stand alone parts store building is on approximately one acre and is located at 9528 E 51st St in Tulsa, Oklahoma.
Our Tulsa location is also home to our engineering research and development laboratory, the Norman Asbjornson Innovation Center. The three-story 134,000 square foot stand alone facility is both an acoustical and a performance measuring laboratory. This facility currently consists of twelve test chambers, allowing AAON to meet and maintain industry certifications. This facility is located West of the 940,000 sq. ft. manufacturing/warehouse building at 2425 South Yukon Avenue.
Our operations in Parkville, Missouri, are conducted in a leased plant/office at 8500 NW River Park Drive, containing 51,000 sq. ft. We believe that the leased facility is well maintained and in good condition and suitable for the conduct of our business.
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AAON Coil Products
Our plant and office facilities in Longview, Texas, consist of a 263,000 sq. ft. building (256,000 sq. ft. of manufacturing/warehouse space and 7,000 sq. ft. of office space) located on a 13-acre tract of land at 203-207 Gum Springs Road and a 222,000 sq. ft. building (210,000 sq. ft. of manufacturing/warehouse space and 12,000 sq. ft. of office space) located on an approximately 22-acre tract of land at 201 Ford Lane. The facilities at Gum Springs and Ford Lane are directly adjacent to each other.
BasX
Our operations in Redmond, Oregon, are conducted in a leased plant/office at 3500 SW 21st Place, containing approximately 194,000 sq. ft. (169,000 sq. ft. of manufacturing/warehouse space and 25,000 sq. ft. of office space). We believe that the leased facility is well maintained and in good condition and suitable for the conduct of our business.
Item 3. Legal Proceedings.
We are not a party to any pending legal proceeding which management believes is likely to result in a material liability and no such action has been threatened against us, or, to the best of our knowledge, is contemplated.
Item 4. Mine Safety Disclosure.
Not applicable.
PART II
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.
Market Information - Our common stock is quoted on the NASDAQ Global Select Market under the symbol “AAON”. As of the close of business on February 23, 2022, there were 955 holders of record of our common stock.
Dividends - At the discretion of the Board of Directors, we pay semi-annual cash dividends. Board approval is required to determine the date of declaration and amount for each semi-annual dividend payment.
Our recent dividends are as follows:

Declaration Date | Record Date | Payment Date | Dividend per Share
May 20, 2019 | June 3, 2019 | July 1, 2019 | $0.16
November 6, 2019 | November 27, 2019 | December 18, 2019 | $0.16
May 15, 2020 | June 3, 2020 | July 1, 2020 | $0.19
November 10, 2020 | November 27, 2020 | December 18, 2020 | $0.19
May 17, 2021 | June 3, 2021 | July 1, 2021 | $0.19
November 9, 2021 | November 26, 2021 | December 17, 2021 | $0.19

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The following is a summary of our share-based compensation plans as of December 31, 2021:

EQUITY COMPENSATION PLAN INFORMATION
Plan category |  | (a) Number of securities to be issued upon exercise of outstanding options, warrants and rights |  | (b) Weighted-average exercise price of outstanding options, warrants and rights |  | (c) Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
The 2007 Long-Term Incentive Plan |  | 159,782 |  |  | $ | 20.19 |  |  | — |
The 2016 Long-Term Incentive Plan |  | 863,882 |  |  | $ | 39.01 |  |  | 3,973,680 |

Repurchases during the fourth quarter of 2021, which include repurchases from our open market, 401(k) and employee repurchase programs, were as follows:

ISSUER PURCHASES OF EQUITY SECURITIES
|  | (a) Total Number of Shares (or Units |  | (b) Average Price Paid (Per Share |  | (c) Total Number of Shares (or Units) Purchased as part of Publicly Announced |  | (d) Maximum Number (or Approximate Dollar Value) of Shares (or Units) that may yet be Purchased under the
Period |  | Purchased) |  | or Unit) |  | Plans or Programs |  | Plans or Programs
October 2021 |  | 19,426 |  |  | $ | 68.98 |  |  | 19,426 |  |  | — |
November 2021 |  | 15,372 |  |  | 76.44 |  |  | 15,372 |  |  | — |
December 2021 |  | 43,385 |  |  | 78.37 |  |  | 43,385 |  |  | — |
Total |  | 78,183 |  |  | $ | 75.66 |  |  | 78,183 |  |  | — |

Comparative Stock Performance Graph
The following performance graph compares our cumulative total shareholder return, the NASDAQ Composite and a peer group of publically traded U.S. industrial manufacturing companies in the air conditioning, ventilation, and heating exchange equipment markets from December 31, 2016 through December 31, 2021. Our peer group includes Lennox International, Inc., Trane Technologies plc (formerly Ingersoll-Rand plc), Johnson Controls International plc, Carrier Global Corporation (formerly United Technologies Corporation), and Vertiv (Vertiv Holding Co.). The graph assumes that $100 was invested at the close of trading December 31, 2016, with reinvestment of dividends. This table is not intended to forecast future performance of our Common Stock.
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1 On March 2, 2020, Trane Technologies PLC (formerly known as Ingersoll-Rand plc) spun off its industrial assets, which made up over 50% of the company’s sales. Thus, historical stock performance prior to the divestiture is not fully representative of the current company’s assets.
2 On April 3, 2020, Carrier Global Corporation was spun off from its parent company, United Technologies Corporation. We have included Carrier's cumulative total shareholder return from April 3, 2020 through December 31, 2021 assuming $100 was invested at the close of trading on April 3, 2020.
3 With its initial public offering in 2018, the first trading date for Vertiv Holdings Co. was July 30, 2018. We have included Vertiv's shareholder return from July 30, 2018 through December 31, 2021 assuming $100 was invested at the close of trading on July 30, 2018.
This stock performance graph is not deemed to be “soliciting material” or otherwise be considered to be “filed” with the SEC or subject to Regulation 14A or 14C under the Securities Exchange Act of 1934 (Exchange Act) or to the liabilities of Section 18 of the Exchange Act, and should not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Exchange Act, except to the extent the Company specifically incorporates it by reference into such a filing.
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Item 6. Reserved.
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.
Overview
The following discussion should be read in conjunction with the other sections of this Annual Report on Form 10-K, including the consolidated financial statements and related notes contained in Item 8, Financial Statements and Supplementary Data.
Description of the Company
We engineer, manufacture, market, and sell premium air conditioning and heating equipment consisting of standard, semi-custom, and custom rooftop units, data center cooling solutions, cleanroom systems, chillers, packaged outdoor mechanical rooms, air handling units, makeup air units, energy recovery units, condensing units, geothermal/water-source heat pump, coils, and controls. These products are marketed and sold to retail, manufacturing, educational, lodging, supermarket, data centers, medical and pharmaceutical, and other commercial industries. We market our products to all 50 states in the United States and certain provinces in Canada.
Our business can be affected by a number of economic factors, including the level of economic activity in the markets in which we operate. The recent rise in architectural billings and nonresidential building construction starts signal a 2022 recovery in nonresidential building construction after experiencing a downturn in 2021. Furthermore, general economic growth combined with pent-up demand from customers that delayed replacing old equipment is driving accelerated replacement demand. However, both the new construction and replacement markets are cyclical. If the domestic economy were to slow or enter a recession, this could result in a decrease in our sales volume and profitability. Sales in the commercial and industrial new construction markets correlate closely to the number of new homes and buildings that are built, which in turn is influenced by cyclical factors such as interest rates, inflation, consumer spending habits, employment rates, and other macroeconomic factors over which we have no control. Sales in the replacement markets are driven by various factors, including general economic growth, the Company’s new product introductions, fluctuations in the average age of existing equipment in the market, government regulations and stimulus, changes in market demand between more customized higher performing HVAC equipment and lower priced standard equipment, as well as many other factors. When new construction is down, we emphasize the replacement market. The replacement market in 2021 improved compared to 2020, while the new construction market was a bit slower.
We sell our products to property owners and contractors mainly through a network of independent manufacturers’ representatives. This go-to-market strategy is unique compared to most of our larger competitors in that most control their sales channel. We value the independent sales channel as we think it is a more effective way of attacking market share. Although we concede full control of the sales process with this strategy, the entrepreneurial aspect of the independent sales channel attracts the most talent and provides greater financial incentives for its salespeople. Furthermore, the independent sales channel sells different types of equipment from various manufacturers, allowing it to operate with more of a solutions-based mindset, as opposed to an internal sales department of a manufacturing company that is incentivized to only sell its equipment regardless if it is the best solution for the end customer. We also have a small internal sales force that supports the relationships between the Company and our sales channel partners. BasX sells highly customized products for unique applications for a more concentrated customer base and an internal sales force is more effective for such products. In total, our internal sales force makes up 65 individuals. The demand for our products is influenced by national and regional economic and demographic factors. The commercial and industrial new construction market is subject to cyclical fluctuations in that it is generally tied to housing starts, but has a lag factor of six to 18 months. Housing starts, in turn, are affected by such factors as interest rates, the state of the economy, population growth, and the relative age of the population.
The principal components of cost of sales are labor, raw materials, component costs, factory overhead, freight out, and engineering expense. The principal high volume raw materials used in our manufacturing processes are steel, copper, and aluminum. We also purchase from other manufacturers certain components, including coils, compressors, motors, and electrical controls.
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The price levels of our raw materials fluctuate given that the market continues to be volatile and unpredictable as a result of the uncertainty related to the U.S. economy and global economy. For the year ended December 31, 2021, the prices for copper, galvanized steel, and stainless steel increased approximately 35.3%, 50.9%, and 45.4%, respectively, and aluminum decreased approximately 4.5%, from 2020. For the year ended December 31, 2020, the prices for copper, galvanized steel and stainless steel increased approximately 0.6%, 12.2%, 8.5%, and 12.8%, respectively, from 2019. We occasionally increase the price of our equipment to help offset any inflationary headwinds. In 2021, given the unusual amount of inflation in our materials, we implemented three price increases.
We also attempt to limit the impact of price fluctuations on these materials by entering into cancellable and non-cancellable fixed price contracts with our major suppliers for periods of six to 18 months. We expect to receive delivery of raw materials from our fixed price contracts for use in our manufacturing operations.
Consolidated Results of Operations

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Net Sales | $ | 534,517 |  |  | $ | 514,551 |  |  | $ | 469,333 |
Cost of Sales | 396,687 |  |  | 358,702 |  |  | 349,908 |
Gross Profit | 137,830 |  |  | 155,849 |  |  | 119,425 |
Selling, general and administrative expenses | 68,598 |  |  | 60,491 |  |  | 52,077 |
(Gain) loss on disposal of assets and insurance recoveries | (21) |  |  | (6,478) |  |  | 337 |
Income from operations | $ | 69,253 |  |  | $ | 101,836 |  |  | $ | 67,011 |

The following are highlights of our results of operations, cash flows, and financial condition:
•Our backlog is at a record level due primarily to strong end-market demand.
•Organic bookings were up approximately 55% compared to 2020.
•On December 10, 2021, we completed the acquisition of BasX bringing the Company exposure to attractive end-markets into which the Company has historically had minimal exposure.
•Sales in 2021 grew year-over-year 3.9% to $534.5 million driven mainly by price increases.
Beginning in the fourth quarter of 2021, we report our financial results based on three reportable segments: AAON Oklahoma, AAON Coil Products, and BasX, which are further described in Item 1, due to the acquisition of BasX and internal leadership reporting changes. The Company's chief decision maker ("CODM"), our CEO, allocates resources and assesses the performance of each operating segment using information about the operating segment's net sales and income from operations. The CODM does not evaluate operating segments using asset or liability information.
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Segment Operating Results for the Years Ended December 31, 2021 and 2020

| For the years ended December 31, |  |  |  |  |
| 2021 |  | Percent of Sales 2 |  | 2020 |  | Percent of Sales 2 |  | $ Change |  | % Change |
| (in thousands) |
Net Sales 3 |  |  |  |  |  |  |  |  |  |  |  |
AAON Oklahoma | $ | 463,845 |  |  | 86.8 | % |  | $ | 458,957 |  |  | 89.2 | % |  | $ | 4,888 |  |  | 1.1 | % |
AAON Coil Products | 66,589 |  |  | 12.5 | % |  | 55,594 |  |  | 10.8 | % |  | 10,995 |  |  | 19.8 | % |
BasX 1 | 4,083 |  |  | 0.8 | % |  | — |  | — |  | 4,083 |  |  | — |
Net sales | $ | 534,517 |  |  |  |  | $ | 514,551 |  |  |  |  | $ | 19,966 |  |  | 3.9 | % |
Cost of Sales 3 |  |  |  |  |  |  |  |  |  |  |  |
AAON Oklahoma | $ | 336,977 |  |  | 72.6 | % |  | 318,858 |  |  | 69.5 | % |  | $ | 18,119 |  |  | 5.7 | % |
AAON Coil Products | 56,514 |  |  | 84.9 | % |  | 39,844 |  |  | 71.7 | % |  | 16,670 |  |  | 41.8 | % |
BasX 1 | 3,196 |  |  | 78.3 | % |  | — |  | — |  | 3,196 |  |  | — |
Cost of sales | $ | 396,687 |  |  | 74.2 | % |  | $ | 358,702 |  |  | 69.7 | % |  | $ | 37,985 |  |  | 10.6 | % |
Gross Profit 3 |  |  |  |  |  |  |  |  |  |  |  |
AAON Oklahoma | $ | 126,868 |  |  | 27.4 | % |  | $ | 140,099 |  |  | 30.5 | % |  | $ | (13,231) |  |  | (9.4) | % |
AAON Coil Products | 10,075 |  |  | 15.1 | % |  | 15,750 |  |  | 28.3 | % |  | (5,675) |  |  | (36.0) | % |
BasX 1 | 887 |  |  | 21.7 | % |  | — |  | — |  | 887 |  |  | — |
Gross profit | $ | 137,830 |  |  | 25.8 | % |  | $ | 155,849 |  |  | 30.3 | % |  | $ | (18,019) |  |  | (11.6) | % |
1 BasX was acquired on December 10, 2021. We have included the results of BasX's operations in our consolidated financial statements as of December 11, 2021.
2 Cost of sales and gross profit for each segment are calculated as a percentage of the respective segment's net sales. Total cost of sales and total gross profit are calculated as a percentage of total net sales.
3 Presented after intercompany eliminations. |

Total net sales increased $20.0 million or 3.9%, due primarily to price increases that totaled of approximately $26.3 million put into place over the last year that were realized during 2021. The acquisition of BasX in December 2021 added $4.1 million to net sales for the short period in December. AAON Coil Products saw a 16.5% increase in units sold, or approximately $9.7 million, due to the increase in capacity with the completion of the new manufacturing building at our Longview, Texas facility in early 2021. Those increases were offset by a total decrease in volumes of approximately $10.8 million due to challenges in COVID-19 related absenteeism, supply chain issues for certain parts, and challenges hiring additional production labor to achieve higher production rates. Additionally, our plants were shut down for several days in January 2021 for planned maintenance and in February 2021 for weather that resulted in lost volume of approximately $18.1 million. Part sales and other increased $9.6 million or 20.5%.
20

As shown in the table below, we've experienced increases in the cost of our raw materials. We put multiple price increases in place during the year to counteract the increased cost of material; however, it took time for those price increases to work through our backlog and be realized. For this reason, we started to see erosion in our gross profit. In the second and third quarters, we encountered challenges in hiring additional production labor, resulting in unfavorable labor and overhead efficiencies, including the Company's ability to absorb certain fixed costs. In order to attract new employees, we increased starting wages for our production workforce by 7.0% in July 2021. In order to retain our existing employees, we also put a cost of living increase of 3.5% in place in October 2021 for all employees below the Director level. The second half of the year was also impacted by various part shortages. This caused us to rearrange production schedules, incur delays and inefficiencies in production, and incur more expensive freight costs. All these things combined with lower production volumes resulted in poor absorption of overhead which caused declines in our gross profit.
Raw Material Costs
Twelve month average raw material cost per pound as of December 31:

|  | 2021 |  | 2020 |  | % Change
Copper |  | $ | 4.94 |  |  | $ | 3.65 |  |  | 35.3 | %
Galvanized Steel |  | $ | 0.83 |  |  | $ | 0.55 |  |  | 50.9 | %
Stainless Steel |  | $ | 2.05 |  |  | $ | 1.41 |  |  | 45.4 | %
Aluminum |  | $ | 1.93 |  |  | $ | 2.02 |  |  | (4.5) | %

Selling, General and Administrative Expenses

|  | Years Ended December 31, |  | Percent of Sales
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | (in thousands) |  |  |  |
Warranty |  | $ | 6,351 |  |  | $ | 6,621 |  |  | 1.2 | % |  | 1.3 | %
Profit Sharing |  | 8,526 |  |  | 11,593 |  |  | 1.6 | % |  | 2.3 | %
Salaries & Benefits |  | 23,458 |  |  | 20,159 |  |  | 4.4 | % |  | 3.9 | %
Stock Compensation |  | 5,543 |  |  | 5,341 |  |  | 1.0 | % |  | 1.0 | %
Advertising |  | 1,616 |  |  | 823 |  |  | 0.3 | % |  | 0.2 | %
Depreciation |  | 2,924 |  |  | 1,999 |  |  | 0.5 | % |  | 0.4 | %
Insurance |  | 3,010 |  |  | 1,066 |  |  | 0.6 | % |  | 0.2 | %
Professional Fees |  | 7,245 |  |  | 2,514 |  |  | 1.4 | % |  | 0.5 | %
Donations |  | 738 |  |  | 2,115 |  |  | 0.1 | % |  | 0.4 | %
Other |  | 9,187 |  |  | 8,260 |  |  | 1.7 | % |  | 1.6 | %
Total SG&A |  | $ | 68,598 |  |  | $ | 60,491 |  |  | 12.8 | % |  | 11.8 | %

Our profit sharing expenses decreased due to decreased earnings in 2021. Salaries & benefits increased due to increases in salaries and bonuses. Professional fees increased mostly due to the transaction costs associated with the acquisition of BasX (Note 4) of $4.4 million. Donations decreased due to the contribution of approximately $1.3 million to Winifred, Montana Public Schools in recognition of Norman H. Asbjornson's transition from CEO to Executive Chairman during 2020.
Gain/Loss on Disposals of Assets and Insurance Proceeds
On April 22, 2020, our plant and office facilities in Tulsa, Oklahoma experienced hail related weather damage and we filed a property insurance claim which carried a $500,000 deductible. We did not experience any significant structural damage or any operational interruption as a result of this weather event. In November 2020, we reached a final settlement with our insurance carrier, resulting in a net cumulative gain of $6.4 million for year ended
21

December 31, 2020. The received proceeds will be used in future periods to make improvements to the current roof at our plant and office facilities in Tulsa, Oklahoma to extend the overall useful life.
Income Taxes

|  | Years Ended December 31, |  | Effective Tax Rate
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | (in thousands) |  |  |  |
Income tax provision |  | $ | 10,424 |  |  | $ | 22,966 |  |  | 15.1 | % |  | 22.5 | %

On May 21, 2021, the State of Oklahoma enacted House Bill 2960, effectively reducing the corporate income tax rate in Oklahoma from 6% to 4%. As a result of these changes, the Company adjusted its state deferred tax assets and liabilities in the second quarter of 2021 using the newly enacted rate for the periods when they are expected to be realized resulting in a benefit of $0.8 million.
During the year ending December 31, 2021, the Company recorded an excess tax benefit of $5.4 million as compared to $3.2 million during 2020, an increase of 68.8%. The increase was primarily due to timing of stock option exercises as a result of our high stock price during the three months ended March 31, 2021 and three months ended December 31, 2021.
22

Segment Operating Results for the Years Ended December 31, 2020 and 2019

| For the years ended December 31, |  |  |  |  |
| 2020 |  | Percent of Sales 1 |  | 2019 |  | Percent of Sales 1 |  | $ Change |  | % Change |
| (in thousands) |
Net Sales 2 |  |  |  |  |  |  |  |  |  |  |  |
AAON Oklahoma | $ | 458,957 |  |  | 89.2 | % |  | $ | 418,669 |  |  | 89.2 | % |  | $ | 40,288 |  |  | 9.6 | % |
AAON Coil Products | 55,594 |  |  | 10.8 | % |  | 50,664 |  |  | 10.8 | % |  | 4,930 |  |  | 9.7 | % |
Net sales | $ | 514,551 |  |  |  |  | $ | 469,333 |  |  |  |  | $ | 45,218 |  |  | 9.6 | % |
Cost of Sales 2 |  |  |  |  |  |  |  |  |  |  |  |
AAON Oklahoma | $ | 318,858 |  |  | 69.5 | % |  | 311,441 |  |  | 74.4 | % |  | $ | 7,417 |  |  | 2.4 | % |
AAON Coil Products | 39,844 |  |  | 71.7 | % |  | 38,467 |  |  | 75.9 | % |  | 1,377 |  |  | 3.6 | % |
Cost of sales | $ | 358,702 |  |  | 69.7 | % |  | $ | 349,908 |  |  | 74.6 | % |  | $ | 8,794 |  |  | 2.5 | % |
|  |  | — | % |  |  |  | — | % |  |  |  |  |
Gross Profit 2 |  |  |  |  |  |  |  |  |  |  |  |
AAON Oklahoma | $ | 140,099 |  |  | 30.5 | % |  | $ | 107,228 |  |  | 25.6 | % |  | $ | 32,871 |  |  | 30.7 | % |
AAON Coil Products | 15,750 |  |  | 28.3 | % |  | 12,197 |  |  | 24.1 | % |  | 3,553 |  |  | 29.1 | % |
Gross profit | $ | 155,849 |  |  | 30.3 | % |  | $ | 119,425 |  |  | 25.4 | % |  | $ | 36,424 |  |  | 30.5 | % |
1 Cost of sales and gross profit for each segment are calculated as a percentage of the respective segment's net sales. Total cost of sales and total gross profit are calculated as a percentage of total net sales.
2 Presented after intercompany eliminations. |

Total net sales increased $45.2 million or 9.6%, mostly due to the increase of rooftop sales from AAON Oklahoma. AAON Oklahoma saw a increase in rooftop units volumes of 8.8%, or approximately $30.6 million, due in part to our increased sheet metal production from the additional Salvagnini machines that were placed into operation allowing increased production and from price increases put in place over the last year. Part sales and other decreased $3.4 million or 6.9%.
The principal components of cost of sales are labor, raw materials, component costs, factory overhead, freight out, and engineering expense. The principal high volume raw materials used in our manufacturing processes are steel, copper, and aluminum.
As shown below, our average raw material prices increased during the year. However, the Company had increased its inventory levels in 2019 and early 2020 at lower prices and was able to benefit from these lower priced raw materials as the inventory was consumed in 2020. The Company improved its labor and overhead efficiencies with our new sheet metal machines that were placed into service in the last quarter of 2019 and early 2020, eliminating any bottlenecks in our sheet metal production. The Company's headcount was also down compared to 2019, resulting in a higher production output per employee.
Raw Material Costs
Twelve month average raw material cost per pound as of December 31:

|  | 2020 |  | 2019 |  | % Change
Copper |  | $ | 3.65 |  |  | $ | 3.63 |  |  | 0.6 | %
Galvanized Steel |  | $ | 0.55 |  |  | $ | 0.49 |  |  | 12.2 | %
Stainless Steel |  | $ | 1.41 |  |  | $ | 1.30 |  |  | 8.5 | %
Aluminum |  | $ | 2.02 |  |  | $ | 1.79 |  |  | 12.8 | %

23

Selling, General and Administrative Expenses

|  | Years Ended December 31, |  | Percent of Sales
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (in thousands) |  |  |  |
Warranty |  | $ | 6,621 |  |  | $ | 8,047 |  |  | 1.3 | % |  | 1.7 | %
Profit Sharing |  | 11,593 |  |  | 7,448 |  |  | 2.3 | % |  | 1.6 | %
Salaries & Benefits |  | 20,159 |  |  | 13,394 |  |  | 3.9 | % |  | 2.9 | %
Stock Compensation |  | 5,341 |  |  | 6,690 |  |  | 1.0 | % |  | 1.4 | %
Advertising |  | 823 |  |  | 818 |  |  | 0.2 | % |  | 0.2 | %
Depreciation |  | 1,999 |  |  | 1,524 |  |  | 0.4 | % |  | 0.3 | %
Insurance |  | 1,066 |  |  | 805 |  |  | 0.2 | % |  | 0.2 | %
Professional Fees |  | 2,514 |  |  | 2,738 |  |  | 0.5 | % |  | 0.6 | %
Donations |  | 2,115 |  |  | 1,137 |  |  | 0.4 | % |  | 0.2 | %
Other |  | 8,260 |  |  | 9,476 |  |  | 1.6 | % |  | 2.0 | %
Total SG&A |  | $ | 60,491 |  |  | $ | 52,077 |  |  | 11.8 | % |  | 11.1 | %

The Company experienced a decrease in warranty claims paid of 15.6% in 2020. Our profit sharing expenses increased due to higher earnings in 2020. Salaries and benefits increased due to additional bonuses and employee incentives. Stock compensation was lower in 2020 because the valuation of the Company-wide equity grant awarded in March 2020 was less than the grant awarded in March 2019. Donations increased due to the contribution of approximately $1.3 million to Winifred, Montana Public Schools in recognition of Norman H. Asbjornson's transition from CEO to Executive Chairman.
Gain/Loss on Disposals of Assets and Insurance Proceeds
On April 22, 2020, our plant and office facilities in Tulsa, Oklahoma experienced hail related weather damage and we filed a property insurance claim which carried a $500,000 deductible. We did not experience any significant structural damage or any operational interruption as a result of this weather event. In November 2020, we reached a final settlement with our insurance carrier, resulting in a net cumulative gain of $6.4 million for the year ended December 31, 2020. The received proceeds will be used in future periods to make improvements to the current roof at our plant and office facilities in Tulsa, Oklahoma to extend the overall useful life.
Income Taxes

|  | Years Ended December 31, |  | Effective Tax Rate
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (in thousands) |  |  |  |
Income tax provision |  | $ | 22,966 |  |  | $ | 13,320 |  |  | 22.5 | % |  | 19.9 | %

Upon completion of the Company's 2018 tax return in 2019, the Company recorded additional benefit due to higher than expected research and development credit of $0.6 million. Additionally in 2019, the Company determined it could take advantage of an additional 1% tax credit in Oklahoma for years in which the Company's location was deemed to be within an enterprise zone. The additional Oklahoma Credit for being in an enterprise zone, or otherwise allowable under Oklahoma law, resulted in a benefit of $1.2 million.
Liquidity and Capital Resources
Our working capital and capital expenditure requirements are generally met through net cash provided by operations and the occasional use of the revolving bank line of credit based on our current liquidity at the time.
24

Working Capital - Our unrestricted cash and cash equivalents decreased $76.2 million from December 31, 2020 to December 31, 2021 primarily due to the use of available cash on hand to fund the acquisition of BasX (Note 4). As of December 31, 2021, we had $3.5 million in cash and cash equivalents and restricted cash.
Revolving Line of Credit - Our revolving credit facility (“Revolver”), as amended and restated, provides for maximum borrowings of $100.0 million. As of December 31, 2021, we had a $40.0 million balance outstanding under the Revolver. We have one standby letter of credit totaling $1.8 million as of December 31, 2021 and 2020. Borrowings available under the Revolver at December 31, 2021, were $58.2 million. The Revolver expires on November 24, 2026.
Any outstanding loans under the Revolver bear interest at the daily compounded secured overnight financing rate ("SOFR") plus the applicable margin. Applicable margin, ranging from 1.25% - 1.75%, is determined quarterly based on the Company's leverage ratio. The Company is also subject to letter of credit fees, ranging from 1.25% - 1.75%, and a commitment fee, ranging from 0.10% - 0.20%. The applicable fee percentage is determined quarterly based on the Company's leverage ratio. At December 31, 2021, the weighted average interest rate of the Revolver was 1.3%. Fees associated with the unused portion of the committed amount are included in interest expense on our consolidated statements of income and were not material for the year ended December 31, 2021.
If SOFR cannot be determined pursuant to the definition, as defined by the Revolver agreement, any outstanding effected loans will be deemed to have been converted into alternative base rate ("ABR") loans. ABR loans would bear interest at a rate per annum equal to the highest of (a) the Prime Rate in effect on such day, (b) the Federal Funds Rate in effect on such day plus 0.50%, or (c) daily simple SOFR for a one-month tenor in effect on such day plus 1.00%.
At December 31, 2021, we were in compliance with our financial covenants, as defined by the Revolver. These covenants require that we meet certain parameters related to our leverage ratio. At December 31, 2021, our leverage ratio was 0.42 to 1.0, which meets the requirement of not being above 3 to 1.
New Market Tax Credit Obligation - On October 24, 2019, the Company entered into a transaction with a subsidiary of an unrelated third-party financial institution (the “Investor”) and a certified Community Development Entity under a qualified New Markets Tax Credit (“NMTC”) program pursuant to Section 45D of the Internal Revenue Code of 1986, as amended, related to an investment in plant and equipment to facilitate the expansion of our Longview, Texas manufacturing operations (the “Project”). In connection with the NMTC transaction, the Company received a $23.0 million NMTC allocation for the Project and secured low interest financing and the potential for future debt forgiveness related to the expansion of its Longview, Texas facilities.
Upon closing of the NMTC transaction, the Company provided an aggregate of approximately $15.9 million to the Investor, in the form of a loan receivable, with a term of twenty-five years, bearing an interest rate of 1.0%. This $15.9 million in proceeds plus capital contributed from the Investor was used to make an aggregate $22.5 million loan to a subsidiary of the Company. This financing arrangement is secured by equipment at the Company's Longview, Texas facilities, and a guarantee from the Company, including an unconditional guarantee of NMTCs.
Stock Repurchase - The Board has authorized three stock repurchase programs for the Company.
The Company may purchase shares on the open market from time to time, up to a total of 5.7 million shares. The Board must authorize the timing and amount of these purchases and all repurchases are in accordance with the rules and regulations of the SEC allowing the Company to repurchase shares from the open market.
Our open market repurchase programs are as follows:

Agreement Execution Date |  | Authorized Repurchase $ |  | Expiration Date
May 16, 2018 1 |  | $15 million |  | March 1, 2019
March 5, 2019 1 |  | $20 million |  | March 4, 2020
March 13, 2020 |  | $20 million |  | ** 2
1 The 2018 and 2019 purchase authorizations were executed under 10b5-1 programs.
2 Expiration Date is at Board's discretion. The Company is authorized to effectuate repurchases of the Company's common stock on terms and conditions approved in advance by the Board.

25

The Company also has a stock repurchase arrangement by which employee-participants in our 401(k) savings and investment plan are entitled to have shares in AAON, Inc. stock in their accounts sold to the Company. The maximum number of shares to be repurchased is contingent upon the number of shares sold by employee-participants.
Lastly, the Company repurchases shares of AAON, Inc. stock from certain of its directors and employees for payment of statutory tax withholdings on stock transactions. All other repurchases from directors or employees are contingent upon Board approval. All repurchases are done at current market prices.
Our repurchase activity is as follows:

|  | 2021 |  | 2020 |  | 2019
|  | (in thousands, except share and per share data)
Program |  | Shares | Total $ | $ per share |  | Shares | Total $ | $ per share |  | Shares | Total $ | $ per share
Open market |  | — |  | $ | — |  | $ | — |  |  | 103,689 |  | $ | 4,987 |  | $ | 48.10 |  |  | 5,799 |  | $ | 200 |  | $ | 34.46 |
401(k) |  | 297,772 |  | 20,876 |  | 70.11 |  |  | 438,921 |  | 25,073 |  | 57.12 |  |  | 419,963 |  | 19,386 |  | 46.16 |
Directors and employees |  | 22,526 |  | 1,590 |  | 70.59 |  |  | 23,272 |  | 1,169 |  | 50.23 |  |  | 28,668 |  | 1,207 |  | 42.11 |
Total |  | 320,298 |  | $ | 22,466 |  | $ | 70.14 |  |  | 565,882 |  | $ | 31,229 |  | $ | 55.19 |  |  | 454,430 |  | $ | 20,793 |  | $ | 45.76 |

|  | Inception to Date
|  | (in thousands, except share and per share data)
Program |  | Shares | Total $ | $ per share
Open market |  | 4,205,255 |  | $ | 74,793 |  | $ | 17.79 |
401(k) |  | 8,204,432 |  | 165,876 |  | 20.22 |
Directors and employees |  | 2,027,727 |  | 22,341 |  | 11.02 |
Total |  | 14,437,414 |  | $ | 263,010 |  | $ | 18.22 |

Dividends - At the discretion of the Board of Directors, we pay semi-annual cash dividends. Board approval is required to determine the date of declaration and amount for each semi-annual dividend payment.
Our recent dividends are as follows:

Declaration Date | Record Date | Payment Date | Dividend per Share
May 20, 2019 | June 3, 2019 | July 1, 2019 | $0.16
November 6, 2019 | November 27, 2019 | December 18, 2019 | $0.16
May 15, 2020 | June 3, 2020 | July 1, 2020 | $0.19
November 10, 2020 | November 27, 2020 | December 18, 2020 | $0.19
May 17, 2021 | June 3, 2021 | July 1, 2021 | $0.19
November 9, 2021 | November 26, 2021 | December 17, 2021 | $0.19

Based on historical performance and current expectations, we believe our cash and cash equivalents balance, the projected cash flows generated from our operations, our existing committed revolving credit facility (or comparable financing), and our expected ability to access capital markets will satisfy our working capital needs, capital expenditures and other liquidity requirements associated with our operations in 2022 and the foreseeable future.
Off-Balance Sheet Arrangements - We are not party to any off-balance sheet arrangements that have or are reasonably likely to have a material current or future effect on our financial condition, changes in financial condition, revenues, expenses, results of operations, liquidity, capital expenditures, or capital resources.
26

Statement of Cash Flows
The table below reflects a summary of our net cash flows provided by operating activities, net cash flows used in investing activities, and net cash flows used in financing activities for the years indicated.

| 2021 |  | 2020 |  | 2019
| (in thousands)
Operating Activities |  |  |  |  |
Net Income | $ | 58,758 |  |  | $ | 79,009 |  |  | $ | 53,711 |
Income statement adjustments, net | 46,566 |  |  | 44,793 |  |  | 42,440 |
Changes in assets and liabilities: |  |  |  |  |
Accounts receivable | (9,737) |  |  | 19,859 |  |  | (13,412) |
Income tax receivable | (1,136) |  |  | (3,815) |  |  | 5,129 |
Inventories | (45,955) |  |  | (9,726) |  |  | 2,557 |
Contract assets | 1,886 |  |  | — |  |  | — |
Prepaid expenses and other | 1,374 |  |  | (2,364) |  |  | (329) |
Accounts payable | 10,899 |  |  | (2,155) |  |  | 280 |
Contract liabilities | (229) |  |  | — |  |  | — |
Deferred revenue | 447 |  |  | 1,010 |  |  | 425 |
Accrued liabilities and donations | (1,690) |  |  | 2,203 |  |  | 7,124 |
Net cash provided by operating activities | 61,183 |  |  | 128,814 |  |  | 97,925 |
Investing Activities |  |  |  |  |
Capital expenditures | (55,362) |  |  | (67,802) |  |  | (37,166) |
Insurance proceeds | — |  |  | 6,417 |  |  | — |
Cash paid in business combination, net of cash acquired | (103,430) |  |  | — |  |  | — |
Purchases of investments | — |  |  | — |  |  | (6,000) |
Maturities of investments and proceeds from called investments | — |  |  | — |  |  | 6,000 |
Other | 73 |  |  | 112 |  |  | 120 |
Net cash used in investing activities | (158,719) |  |  | (61,273) |  |  | (37,046) |
Financing Activities |  |  |  |  |
Borrowings under revolving credit facility | 40,000 |  |  | — |  |  | — |
Proceeds from financing obligation, net of issuance costs | — |  |  | — |  |  | 6,614 |
Payment related to financing costs | — |  |  | — |  |  | (301) |
Stock options exercised | 21,148 |  |  | 21,418 |  |  | 12,625 |
Repurchase of stock | (20,876) |  |  | (30,060) |  |  | (19,586) |
Employee taxes paid by withholding shares | (1,590) |  |  | (1,169) |  |  | (1,207) |
Cash dividends paid to stockholders | (19,947) |  |  | (19,815) |  |  | (16,645) |
Net cash provided by (used in) financing activities | $ | 18,735 |  |  | $ | (29,626) |  |  | $ | (18,500) |

Cash Flows from Operating Activities
The decrease in cash flows from receivables was due to the increase in sales in the fourth quarter of 2021 as compared to 2020, as a result of the planned Company shutdown during the last week of December 2020. The decrease in cash flows from inventory is a result of increased costs of materials and some larger purchases made in the year to help deter supply chain issues and long lead times. The increase in cash flows from accounts payable is primarily driven by the timing of payments.
Cash Flows from Investing Activities
Cash flows from investing activities increased in 2021 as compared to 2020 and 2019 primarily due to the cash paid for the acquisition of BasX (Note 4) in December 2021. This increase is offset by decreased capital expenditures in 2021 compared to 2020 and insurance proceeds received in November 2020. The capital expenditures for 2020
27

relate to the completion of our Longview facility expansion as well as the addition to and replacement of sheet metal manufacturing equipment.
Our capital expenditure program for 2022 is estimated to be approximately $100.4 million. Many of these projects are subject to review and cancellation at the discretion of our CEO and Board of Directors without incurring substantial charges.
Cash Flows from Financing Activities
Cash flows from financing activities is historically affected by the timing of stock options exercised by our employees and repurchases of the Company's stock. However, in 2021, the increase in cash from financing activities is primarily related to borrowings under our revolving credit facility to manage our working capital needs after our available cash on hand was used to fund the BasX acquisition.
Our stock buyback program and dividends paid were $22.5 million and $19.9 million for the year ended December 31, 2021, respectively. We expect to continue the buyback program as well as paying semi-annual dividends at historical rates. The future costs of the buyback program could fluctuate based on market conditions including our published stock price and buyback transaction volume.
Commitments and Contractual Agreements
We had no material contractual purchase agreements as of December 31, 2021.
Contingencies
We are subject to various claims and legal actions that arise in the ordinary course of business. We closely monitor these claims and legal actions and frequently consult with our legal counsel to determine whether they may, when resolved, have a material adverse effect on our financial position, results of operations or cash flows and we accrue and/or disclose loss contingencies as appropriate. We have concluded that the likelihood is remote that the ultimate resolution of any pending litigation or claims will be material or have a material adverse effect on the Company’s business, financial position, results of operations, or cash flows.
Critical Accounting Estimates
The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“US GAAP”) requires management to make estimates and assumptions about future events, and apply judgments that affect the reported amounts of assets, liabilities, revenue, and expenses in our consolidated financial statements and related notes. We base our estimates, assumptions, and judgments on historical experience, current trends, and other factors believed to be relevant at the time our consolidated financial statements are prepared. However, because future events and their effects cannot be determined with certainty, actual results could differ from our estimates and assumptions, and such differences could be material. We believe the following critical accounting policies affect our more significant estimates, assumptions and judgments used in the preparation of our consolidated financial statements. We discuss these estimates with the Audit Committee of the Board of Directors periodically.
Inventory Reserves – We establish a reserve for inventories based on the change in inventory requirements due to product line changes, the feasibility of using obsolete parts for upgraded part substitutions, the required parts needed for part supply sales and replacement parts, and for estimated shrinkage. Assumptions used to estimate inventory reserves include future manufacturing requirements and industry trends. Evolving technology and changes in product mix or customer demand can significantly affect the outcome of this analysis.
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Warranty – A provision is made for estimated warranty costs at the time the product is shipped and revenue is recognized. Our product warranty policy is the earlier of one year from the date of first use or 18 months from date of shipment for parts only; 18 months for data center cooling solutions and cleanroom systems; an additional four years for compressors (if applicable); 15 years on aluminized steel gas-fired heat exchangers (if applicable); 25 years on stainless steel heat exchangers (if applicable); and ten years on gas-fired heat exchangers in our historical RL products (if applicable). Our warranty policy for the RQ series covers parts for two years from date of unit shipment. Our warranty policy for the WH and WV Series geothermal/water-source heat pumps covers parts for five years from the date of installation. Warranty expense is estimated based on the warranty period, historical warranty trends and associated costs, and any known identifiable warranty issue.
Due to the absence of warranty history on new products, an additional provision may be made for such products. Our estimated future warranty cost is subject to adjustment from time to time depending on changes in actual warranty trends and cost experience. Should actual claim rates differ from our estimates, revisions to the estimated product warranty liability would be required.
Share-Based Compensation – We measure and recognize compensation expense for all share-based payment awards made to our employees and directors, including stock options, restricted stock awards, performance stock units ("PSUs"), and key employee awards ("Key Employee Awards") based on their fair values at the time of grant. Compensation expense is recognized on a straight-line basis over the service period of stock options, restricted stock awards, and PSUs. Compensation expense is recognized for the Key Employee Awards on a straight line basis over the service period when the performance condition is determined to be probable. Forfeitures are accounted for as they occur. The fair value of each option award is estimated on the date of grant using the Black-Scholes-Merton option pricing model. The fair value of the PSUs is estimated on the date of grant using the Monte Carlo Model. The use of the Black-Scholes-Merton option valuation model and the Monte Carlo Model requires the input of subjective assumptions such as: the expected volatility, the expected term of the grant, forward-looking market conditions, risk-free rate, and expected dividend yield for stock options. The fair value of restricted stock awards and Key Employee Awards is based on the fair market value of AAON common stock on the respective grant dates. The fair value of restricted stock awards is reduced for the present value of dividends.
Definite-Lived Intangible Assets
Definite-lived intangible assets include various customer relationships and intellectual property acquired in business combinations. The fair value of customer relationships and intellectual property is estimated based on management’s judgments and assumptions or third party valuation models. These models requires the use of subjective inputs and assumptions such as expected useful lives, growth of existing customers, attrition of customers, future margins and expenses, discount rates, and future revenue growth. These inputs and assumptions can be inherently uncertain and can significantly affect the outcome of the estimates and analysis. We amortize our definite-lived intangible assets on a straight-line basis over the estimated useful lives of the assets. Our definite-lived intangible assets have estimated used lives of between 14 and 30 years. We evaluate the carrying value of our amortizable intangible assets for potential impairment when events and circumstances warrant such a review.
Goodwill and Indefinite-Lived Intangible Assets
Goodwill represents the excess of the consideration paid for the acquired businesses over the fair value of the individual assets acquired, net of liabilities assumed. Indefinite-lived intangible assets consist of trademarks and trade names. The fair value of trademarks and trade names is estimated based on management’s judgments and assumptions or third party valuations. These models requires the us of subjective inputs such as royalty rate, discount rate, and terminal value.
Goodwill and indefinite-lived intangible assets are not amortized, but instead are evaluated for impairment at least annually. We perform our annual assessment of impairment during the fourth quarter of our fiscal year, and more frequently if circumstances warrant.
To perform this assessment, we first consider qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit and indefinite-lived intangible assets exceeds their carrying amount. If we conclude that it is more likely than not that the fair value of a reporting unit and indefinite-lived assets does not exceed their carrying amount, we calculate the fair value for the report unit and indefinite-lived assets and compare the amount to their carrying amount. If the fair value of a reporting unit and indefinite-lived asset exceeds their
29

carrying amount, the reporting unit and indefinite-lived assets are not considered impaired. If the carrying amount of the reporting unit and indefinite-lived assets exceeds their fair value, the reporting unit and indefinite-lived assets are considered to be impaired and the balance is reduced by the difference between the fair value and carrying amount of the reporting unit and indefinite-lived assets.
We performed a qualitative assessment as of December 31, 2021 to determine whether it was more likely than not that the fair value of the reporting unit and indefinite-lived assets was greater than the carrying value of the reporting unit and indefinite-lived assets. Based on these qualitative assessments, we determined that the fair value of the reporting unit and indefinite-lived assets was more likely than not greater than the carrying value of the reporting unit and indefinite-lived assets.
Estimates and assumptions used to perform the impairment evaluation are inherently uncertain and can significantly affect the outcome of the analysis. The estimates and assumptions we use in the annual impairment assessment included macro-industry trends, market participant considerations, historical profitability, including free cash flows, and forecasted multi-year operating results. Changes in operating results and other assumptions could materially affect these estimates. A considerable amount of management judgment and assumptions are required in performing the impairment tests.
Contingent Consideration - As part of a business combination, we agreed to issue shares of the Company's common
stock based on certain milestones in accordance with the acquisition agreement. This contingent consideration is valued at fair value on the acquisition date and is included in goodwill and additional paid-in capital on the consolidated balance sheets.
The fair value of the contingent consideration was determined using the Option Pricing Method through a Monte Carlo simulation, as this model is appropriate for contingent considerations for which the payoff structure is nonlinear. The use of this model requires the input of subjective inputs and assumptions such as: future earnings, the expected volatility of future earnings, risk-free rate, discount rate, and future stock performance. These inputs and assumptions can be inherently uncertain and can significantly affect the outcome of the estimates and analysis.
New Accounting Pronouncements
Changes to U.S. GAAP are established by the Financial Accounting Standards Board (“FASB”) in the form of accounting standards updates (“ASUs”) to the FASB’s Accounting Standards Codification.
We consider the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial statements and notes thereto.
In October 2021, the FASB issued ASU No. 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers which requires contract assets and contract liabilities acquired in a business combination to be recognized and measured by the acquirer on the acquisition date in accordance with ASC 606, Revenue from Contracts with Customers. Generally, this new guidance will result in the acquirer recognizing contract assets and contract liabilities at the same amounts recorded by the acquiree. Historically, such amounts were recognized by the acquirer at fair value in acquisition accounting. The guidance should be applied prospectively to acquisitions occurring on or after the effective date. The guidance is effective for years beginning after December 15, 2022, including interim periods within those years. Early adoption is permitted, including in interim periods, for any financial statements that have not yet been issued. We adopted this standard at the beginning of the fourth quarter of 2021. Upon adoption, this update did not have a material effect on our consolidated financial position or result of operations.
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Item 7A. Quantitative and Qualitative Disclosures About Market Risk.
Commodity Price Risk
We are exposed to volatility in the prices of commodities used in some of our products and, occasionally, we use fixed price cancellable and non-cancellable contracts with our major suppliers for periods of six to 18 months to manage this exposure.
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Item 8. Financial Statements and Supplementary Data.
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

| Page
Report of Independent Registered Public Accounting Firm (PCAOB ID Number 248) | 33
Consolidated Balance Sheets | 35
Consolidated Statements of Income | 36
Consolidated Statements of Stockholders’ Equity | 37
Consolidated Statements of Cash Flows | 38
Notes to Consolidated Financial Statements | 39

32

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
Board of Directors and Stockholders
AAON, Inc.
Opinion on the financial statements
We have audited the accompanying consolidated balance sheets of AAON, Inc. (a Nevada corporation) and subsidiaries (the “Company”) as of December 31, 2021 and 2020, the related consolidated statements of income, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2021, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2021 and 2020, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2021, in conformity with accounting principles generally accepted in the United States of America.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2021, based on criteria established in the 2013 Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”), and our report dated February 28, 2022 expressed an unqualified opinion.
Basis for opinion
These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
Critical audit matters
The critical audit matters communicated below are matters arising from the current period audit of the financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.
Inventory – manual inventory adjustments
As described in Note 2 to the financial statements, the Company reports inventory using the first in, first out (“FIFO”) method, which involves manual adjustments recorded to the general ledger such as inventory variance, inventory allowance and labor and overhead adjustments, which had the potential to be larger or require more judgment during the year ended December 31, 2021, where the Company experienced changes in the prices of certain raw materials due to the COVID-19 pandemic. These manual adjustments have been identified as a critical audit matter.
The principal considerations for our determination such manual inventory adjustments as a critical audit matter are these manual adjustments require substantial use of management estimates and requires the Company to have effective inventory valuation processes. Significant management judgments and estimates utilized to determine manual inventory adjustments are subject to estimation uncertainty and require significant auditor subjectivity in evaluating the reasonableness of those judgments and estimates.
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Our audit procedures related to the manual inventory adjustments included the following, among others.
•We tested the design and operating effectiveness of controls over inventory valuation, including the standard cost updates in the accounting system and the completeness and accuracy of the inputs to the inventory variance calculation and any related adjustments.
•We recalculated the Company’s standard costing of inventory which approximated FIFO by obtaining FIFO buildups and inspected underlying documents for a sample of raw materials.
•We assessed the reasonableness of management’s inventory reserve by recalculating the reserve using management’s inputs, and evaluated those inputs for reasonableness.
•We tested labor and overhead rate changes by recalculating the rates used and tested any adjustments recorded to the general ledger.
BasX, LLC Acquisition
As described in Note 4 to the financial statements, the Company acquired a controlling interest in BasX, LLC (“BasX”) in December 2021 and the assets acquired, the liabilities assumed and contingent consideration payable were estimated and recorded at fair value as of the transaction date, for which the Company utilized a valuation specialist. We identified the estimation of the fair value of the intangible assets acquired and contingent consideration payable in the acquisition of BasX as a critical audit matter.
The principal considerations for our determination that the estimation of the fair value of the intangible assets acquired and contingent consideration payable in the acquisition of BasX as a critical audit matter are that there was a high degree of estimation uncertainty due to significant judgments with respect to the selection of the valuation methodologies applied, the assumptions used to estimate the future revenues and cash flows, including revenue growth rates and forecasted costs, discount rates, royalty rates, and obsolescence of intellectual property. This required an increased extent of effort when performing audit procedures to evaluate the reasonableness of management’s estimates and assumptions related to the fair value of the intangible assets acquired and contingent consideration payable, including the need to involve valuation specialists.
Our audit procedures responsive to the estimation of the fair value of the intangible assets acquired and contingent consideration payable for the acquisition of BasX included the following procedures, among others.
•We tested the design and operating effectiveness of controls relating to management’s review of the assumptions used to develop the future revenues and cash flows, the reconciliation of future revenues and cash flows prepared by management to the data used in the third-party valuation report, and the aforementioned valuation inputs and methodologies applied.
•Utilized a valuation specialist to evaluate:
◦The methodologies used and whether they were acceptable for the underlying assets or operations by performing an independent calculation.
◦The appropriateness of the royalty rates attributed to both intellectual property and trademarks and the obsolescence of intellectual property using our understanding of BasX’s business and historical financial results, intellectual property and trademarks and the Company’s future plans.
◦The appropriateness of the discount rates by recalculating the weighted average costs of capital.
◦The qualifications of the Company’s valuation specialist based on their credentials and experience.
•Tested the revenue growth rates and forecasted costs of BasX by comparing such items to the historical operating results of the acquired entity and by assessing the likelihood or capability of the acquired entity to undertake activities or initiatives underpinning significant drivers of growth in the forecasted period.
/s/ GRANT THORNTON LLP
We have served as the Company’s auditor since 2004.
Tulsa, Oklahoma
February 28, 2022
34

AAON, Inc. and Subsidiaries
Consolidated Balance Sheets
| December 31,
| 2021 |  | 2020
Assets | (in thousands, except share and per share data)
Current assets: |  |  |
Cash and cash equivalents | $ | 2,859 |  |  | $ | 79,025 |
Restricted cash | 628 |  |  | 3,263 |
Accounts receivable, net of allowance for credit losses of $549 and $506, respectively | 70,780 |  |  | 47,387 |
Income tax receivable | 5,723 |  |  | 4,587 |
Inventories, net | 130,270 |  |  | 82,219 |
Contract assets | 5,749 |  |  | — |
Prepaid expenses and other | 2,071 |  |  | 3,770 |
Total current assets | 218,080 |  |  | 220,251 |
Property, plant and equipment: |  |  |
Land | 5,016 |  |  | 4,072 |
Buildings | 135,861 |  |  | 122,171 |
Machinery and equipment | 318,259 |  |  | 281,266 |
Furniture and fixtures | 23,072 |  |  | 18,956 |
Total property, plant and equipment | 482,208 |  |  | 426,465 |
Less: Accumulated depreciation | 224,146 |  |  | 203,125 |
Property, plant and equipment, net | 258,062 |  |  | 223,340 |
Intangible assets, net | 70,121 |  |  | 38 |
Goodwill | 85,727 |  |  | 3,229 |
Right of use assets | 16,974 |  |  | 1,571 |
Other long-term assets | 1,216 |  |  | 579 |
Total assets | $ | 650,180 |  |  | $ | 449,008 |
Liabilities and Stockholders’ Equity |  |  |
Current liabilities: |  |  |
Accounts payable | $ | 29,020 |  |  | $ | 12,447 |
Accrued liabilities | 50,206 |  |  | 46,586 |
Contract liabilities | 7,542 |  |  | — |
Total current liabilities | 86,768 |  |  | 59,033 |
Revolving credit facility, long-term | 40,000 |  |  | — |
Deferred tax liabilities | 31,993 |  |  | 28,324 |
Other long-term liabilities | 18,843 |  |  | 4,423 |
New market tax credit obligation (a) | 6,406 |  |  | 6,363 |
Commitments and contingencies (Note 19) |  |  |
Stockholders’ equity: |  |  |
Preferred stock, $.001 par value, 5,000,000 shares authorized, no shares issued | — |  |  | — |
Common stock, $.004 par value, 100,000,000 shares authorized, 52,527,985 and 52,224,767 issued and outstanding at December 31, 2021 and 2020, respectively | 210 |  |  | 209 |
Additional paid-in capital | 81,654 |  |  | 5,161 |
Retained earnings | 384,306 |  |  | 345,495 |
Total stockholders’ equity | 466,170 |  |  | 350,865 |
Total liabilities and stockholders’ equity | $ | 650,180 |  |  | $ | 449,008 |
(a) Held by variable interest entities (Note 18) |  |  |

The accompanying notes are an integral part of these consolidated financial statements.
35

AAON, Inc. and Subsidiaries |  |
Consolidated Statements of Income |  |
| Years Ended December 31, |  |
| 2021 |  | 2020 |  | 2019 |  |
| (in thousands, except share and per share data) |  |
Net sales | $ | 534,517 |  |  | $ | 514,551 |  |  | $ | 469,333 |  |  |
Cost of sales | 396,687 |  |  | 358,702 |  |  | 349,908 |  |  |
Gross profit | 137,830 |  |  | 155,849 |  |  | 119,425 |  |  |
Selling, general and administrative expenses | 68,598 |  |  | 60,491 |  |  | 52,077 |  |  |
(Gain) loss on disposal of assets and insurance recoveries | (21) |  |  | (6,478) |  |  | 337 |  |  |
Income from operations | 69,253 |  |  | 101,836 |  |  | 67,011 |  |  |
Interest (expense) income, net | (132) |  |  | 88 |  |  | 66 |  |  |
Other income (expense), net | 61 |  |  | 51 |  |  | (46) |  |  |
Income before taxes | 69,182 |  |  | 101,975 |  |  | 67,031 |  |  |
Income tax provision | 10,424 |  |  | 22,966 |  |  | 13,320 |  |  |
Net income | $ | 58,758 |  |  | $ | 79,009 |  |  | $ | 53,711 |  |  |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 1.12 |  |  | $ | 1.51 |  |  | $ | 1.03 |  |  |
Diluted | $ | 1.09 |  |  | $ | 1.49 |  |  | $ | 1.02 |  |  |
Cash dividends declared per common share: | $ | 0.38 |  |  | $ | 0.38 |  |  | $ | 0.32 |  |  |
Weighted average shares outstanding: |  |  |  |  |  |  |
Basic | 52,404,199 |  |  | 52,168,679 |  |  | 52,079,865 |  |  |
Diluted | 53,728,989 |  |  | 53,061,169 |  |  | 52,635,415 |  |  |

The accompanying notes are an integral part of these consolidated financial statements.
36

AAON, Inc. and Subsidiaries
Consolidated Statements of Stockholders’ Equity
| Common Stock |  | Paid-in |  | Retained |  |
| Shares |  | Amount |  | Capital |  | Earnings |  | Total
| (in thousands)
Balance at December 31, 2018 | 51,991 |  |  | $ | 208 |  |  | $ | — |  |  | $ | 249,235 |  |  | $ | 249,443 |
Net income | — |  |  | — |  |  | — |  |  | 53,711 |  |  | 53,711 |
Stock options exercised and restricted | 542 |  |  | 2 |  |  | 12,623 |  |  | — |  |  | 12,625 |
stock awards granted |  |  |  |  |  |  |  |  |
Share-based compensation | — |  |  | — |  |  | 11,799 |  |  | — |  |  | 11,799 |
Stock repurchased and retired | (454) |  |  | (2) |  |  | (20,791) |  |  | — |  |  | (20,793) |
Dividends | — |  |  | — |  |  | — |  |  | (16,645) |  |  | (16,645) |
Balance at December 31, 2019 | 52,079 |  |  | 208 |  |  | 3,631 |  |  | 286,301 |  |  | 290,140 |
Net income | — |  |  | — |  |  | — |  |  | 79,009 |  |  | 79,009 |
Stock options exercised and restricted | 712 |  |  | 3 |  |  | 21,415 |  |  | — |  |  | 21,418 |
stock awards granted |  |  |  |  |  |  |  |  |
Share-based compensation | — |  |  | — |  |  | 11,342 |  |  | — |  |  | 11,342 |
Stock repurchased and retired | (566) |  |  | (2) |  |  | (31,227) |  |  | — |  |  | (31,229) |
Dividends | — |  |  | — |  |  | — |  |  | (19,815) |  |  | (19,815) |
Balance at December 31, 2020 | 52,225 |  |  | 209 |  |  | 5,161 |  |  | 345,495 |  |  | 350,865 |
Net income | — |  |  | — |  |  | — |  |  | 58,758 |  |  | 58,758 |
Stock options exercised and restricted | 623 |  |  | 2 |  |  | 21,146 |  |  | — |  |  | 21,148 |
stock awards granted |  |  |  |  |  |  |  |  |
Share-based compensation | — |  |  | — |  |  | 11,812 |  |  | — |  |  | 11,812 |
Stock repurchased and retired | (320) |  |  | (1) |  |  | (22,465) |  |  | — |  |  | (22,466) |
Contingent consideration (Note 4) | — |  |  | — |  |  | 66,000 |  |  | — |  |  | 66,000 |
Dividends | — |  |  | — |  |  | — |  |  | (19,947) |  |  | (19,947) |
Balance at December 31, 2021 | 52,528 |  |  | $ | 210 |  |  | $ | 81,654 |  |  | $ | 384,306 |  |  | $ | 466,170 |

The accompanying notes are an integral part of these consolidated financial statements.
37

AAON, Inc. and Subsidiaries
Consolidated Statements of Cash Flows
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Operating Activities | (in thousands)
Net income | $ | 58,758 |  |  | $ | 79,009 |  |  | $ | 53,711 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Depreciation and amortization | 30,343 |  |  | 25,634 |  |  | 22,766 |
Amortization of debt issuance costs | 43 |  |  | 43 |  |  | 7 |
Amortization of right of use assets | 73 |  |  | — |  |  | — |
Provision for credit losses on accounts receivable, net of adjustments | 43 |  |  | 153 |  |  | 91 |
Provision for excess and obsolete inventories | 629 |  |  | 1,108 |  |  | 1,454 |
Share-based compensation | 11,812 |  |  | 11,342 |  |  | 11,799 |
(Gain) loss on disposition of assets and insurance recoveries | (21) |  |  | (6,478) |  |  | 337 |
Foreign currency transaction gain | (1) |  |  | (12) |  |  | (27) |
Interest income on note receivable | (24) |  |  | (24) |  |  | (25) |
Deferred income taxes | 3,669 |  |  | 13,027 |  |  | 6,038 |
Changes in assets and liabilities: |  |  |  |  |
Accounts receivable | (9,737) |  |  | 19,859 |  |  | (13,412) |
Income tax receivable | (1,136) |  |  | (3,815) |  |  | 5,129 |
Inventories | (45,955) |  |  | (9,726) |  |  | 2,557 |
Contract assets | 1,886 |  |  | — |  |  | — |
Prepaid expenses and other | 1,374 |  |  | (2,364) |  |  | (329) |
Accounts payable | 10,899 |  |  | (2,155) |  |  | 280 |
Contract liabilities | (229) |  |  | — |  |  | — |
Deferred revenue | 447 |  |  | 1,010 |  |  | 425 |
Accrued liabilities and donations | (1,690) |  |  | 2,203 |  |  | 7,124 |
Net cash provided by operating activities | 61,183 |  |  | 128,814 |  |  | 97,925 |
Investing Activities |  |  |  |  |
Capital expenditures | (55,362) |  |  | (67,802) |  |  | (37,166) |
Cash paid in business combination, net of cash acquired | (103,430) |  |  | — |  |  | — |
Proceeds from sale of property, plant and equipment | 19 |  |  | 60 |  |  | 69 |
Insurance proceeds | — |  |  | 6,417 |  |  | — |
Investment in certificates of deposits | — |  |  | — |  |  | (6,000) |
Maturities of certificates of deposits | — |  |  | — |  |  | 6,000 |
Principal payments from note receivable | 54 |  |  | 52 |  |  | 51 |
Net cash used in investing activities | (158,719) |  |  | (61,273) |  |  | (37,046) |
Financing Activities |  |  |  |  |
Borrowings under revolving credit facility | 40,000 |  |  | — |  |  | — |
Proceeds from financing obligation, net of issuance costs | — |  |  | — |  |  | 6,614 |
Payment related to financing costs | — |  |  | — |  |  | (301) |
Stock options exercised | 21,148 |  |  | 21,418 |  |  | 12,625 |
Repurchase of stock | (20,876) |  |  | (30,060) |  |  | (19,586) |
Employee taxes paid by withholding shares | (1,590) |  |  | (1,169) |  |  | (1,207) |
Dividends paid to stockholders | (19,947) |  |  | (19,815) |  |  | (16,645) |
Net cash provided by (used in) financing activities | 18,735 |  |  | (29,626) |  |  | (18,500) |
Net (decrease) increase in cash, cash equivalents and restricted cash | (78,801) |  |  | 37,915 |  |  | 42,379 |
Cash, cash equivalents and restricted cash, beginning of year | 82,288 |  |  | 44,373 |  |  | 1,994 |
Cash, cash equivalents and restricted cash, end of year | $ | 3,487 |  |  | $ | 82,288 |  |  | $ | 44,373 |

The accompanying notes are an integral part of these consolidated financial statements.
38

AAON, Inc. and Subsidiaries
Notes to Consolidated Financial Statements
December 31, 2021
1. Business Description
AAON, Inc. is a Nevada corporation which was incorporated on August 18, 1987. Our operating subsidiaries include AAON, Inc., an Oklahoma corporation, AAON Coil Products, Inc., a Texas corporation, and BasX, Inc. (dba BasX Solutions), an Oregon corporation (collectively, the “Company”). The consolidated financial statements include our accounts and the accounts of our subsidiaries.
We are engaged in the engineering, manufacturing, marketing, and sale of premium air conditioning and heating equipment consisting of standard, semi-custom, and custom rooftop units, data centers cooling solutions, cleanroom systems, chillers, packaged outdoor mechanical rooms, air handling units, makeup air units, energy recovery units, condensing units, geothermal/water-source heat pumps, coils, and controls.
Recent Developments
On December 10, 2021, we closed on the acquisition of all of the issued and outstanding equity ownership of BasX, LLC, doing business as BasX Solutions ("BasX") (Note 4). We have included the results of BasX’s operations in our consolidated financial statements beginning December 11, 2021.
On December 29, 2021, BasX, LLC converted to a C-Corporation, BasX, Inc., and is subject to income tax.
2. Summary of Significant Accounting Policies
Principles of Consolidation
These financial statements are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All inter-company accounts and transactions have been eliminated.
Our financial statements consolidate all of our affiliated entities in which we have a controlling financial interest. Because we hold certain rights that give us the power to direct the activities of two variable interest entities ("VIEs") (Note 18) that most significantly impact the VIEs economic performance, combined with a variable interest that gives us the right to receive potentially significant benefits or the obligation to absorb potentially significant losses, we have a controlling financial interest in those VIEs.
Impact of COVID-19 Pandemic
In March 2020, the World Health Organization characterized the coronavirus ("COVID-19") a pandemic, and the President of the United States declared the COVID-19 outbreak a national emergency. The rapid spread of the pandemic and the continuously evolving responses to combat it have had an increasingly negative impact on the global economy.
Our manufacturing operations are considered a critical infrastructure industry, as defined by the U.S. Department of Homeland Security, as such, the decrees issued by national, state, and local governments in response to the COVID-19 pandemic have had minimal impact on our operations except for higher than normal employee absenteeism in our manufacturing facilities. Notable absenteeism occurred the latter part of June 2020 at our Tulsa, OK facilities which resulted in reduced shipments and longer lead times in the second quarter 2020. Additionally, our Longview, TX facility suffered from COVID-19 related absenteeism during the quarter ending September 30, 2021, which reduced the production of coils that were needed to complete units at both our Longview, TX and Tulsa, OK facilities.
We had continuous operations during the years ended December 31, 2021 and December 31, 2020, except for events unrelated to COVID-19 described below. Additional precautions have been taken to social distance workers that
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work in close environments and we have facilitated voluntary on-site COVID-19 vaccine clinics. The Company utilizes sanitation stations and performs additional cleaning and sanitation throughout the day.
We witnessed increases in some of our raw material prices, especially in copper and steel, which appear to be an effect of COVID-19, and we continue to make strategic purchases of materials when we see opportunities. We have managed the increase in the cost of raw materials through price increases for our products which began to be realized in late 2021. Although we have experienced some supply chain challenges related to specific manufacturing parts, due to our strong vendor relationships as well as our favorable liquidity position, we have experienced minimal disruption to our supply chain due to COVID-19.
Additionally, we continue to experience challenges in a tight labor market, especially the hiring of both skilled and unskilled production labor. In July 2021, we increased starting wages for our production workforce by 7.0%. We also have put a cost of living increase of 3.5% in place in October 2021 for all employees below the Director level. We will continue to implement human resource initiatives to retain and attract labor to further improve productivity and production efficiencies.
The magnitude of the impact of COVID-19 remains unpredictable and we, therefore, continue to anticipate potential supply chain disruptions, increased employee absenteeism and additional health and safety costs related to the COVID-19 pandemic that could unfavorably impact our business. However, COVID-19 has had no significant impact on our planned cash outflows for raw materials, dividend payments, or capital expenditures.
Although these disruptions and costs are expected to be temporary, there is significant uncertainty around the duration and overall impact to our business operations. We are continually monitoring the progression of the pandemic, including new COVID-19 variants, and its potential effect on our financial position, results of operations and cash flows.
Planned Plant Maintenance
During the fourth quarter of 2020, we made the strategic decision to shut down our Tulsa, OK and Longview, TX manufacturing facilities to perform planned and necessary maintenance during the last week of December 2020 as well several days in early January 2021. Although we lost several production days due to this shut down, we do not believe that the impact of the shut down had a material adverse effect on the results of our operations, financial position and cash flows as of and for the year ending December 31, 2021.
Impact of February 2021 Weather
In February 2021, record-breaking winter storms affected Oklahoma and Texas, causing sustained below freezing temperatures, hazardous driving conditions, rolling blackouts, water main breaks, and a host of other weather related issues. In addition to significant absenteeism as a result of employees being unable to travel to and from work due to inadequate transportation and/or hazardous road conditions, the Company made the decision to shut down the Tulsa, OK and Longview, TX plants for several days. This decision was based on the expected employee absenteeism as well as the expected rolling blackouts caused by the increased demand on the electrical and natural gas power grids. Although we lost several production days in mid-February 2021, we do not believe that the impact of this weather event had a material adverse effect on the results of our operations, financial position and cash flows as of and for the year ending December 31, 2021.
Cash and Cash Equivalents
We consider all highly liquid temporary investments with original maturity dates of three months or less to be cash equivalents. Cash and cash equivalents consist of bank deposits and highly liquid, interest-bearing money market funds.
The Company’s cash and cash equivalents are held in a few financial institutions in amounts that exceed the insurance limits of the Federal Deposit Insurance Corporation. However, management believes that the Company’s counterparty risks are minimal based on the reputation and history of the institutions selected.
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Certificates of Deposit
We held no certificates of deposit at December 31, 2021 and 2020.
Restricted Cash
Restricted cash held at December 31, 2021 consist of bank deposits and highly liquid, interest-bearing money market funds held for the purpose of the Company's qualified New Markets Tax Credit program (Note 18) to benefit an investment in plant and equipment to facilitate the expansion of our Longview, Texas manufacturing operations.
The Company’s restricted cash is held in a financial institutions in amounts that exceed the insurance limits of the Federal Deposit Insurance Corporation. However, management believes that the Company’s counterparty risks are minimal based on the reputation and history of the institutions selected.
Accounts and Note Receivable
We adopted ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), as amended, as of January 1, 2020. The ASU requires a financial asset (or a group of financial assets) measured at amortized cost to be presented at the net amount expected to be collected, which would include accounts receivable. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. The adoption of this ASU did not have a material effect on our financial statements.
Accounts and note receivable are stated at amounts due from customers, net of an allowance for credit losses. We generally do not require that our customers provide collateral; however, our billings and customer payment terms can vary based on product type as a way to manage collections risk. The Company determines its allowance for credit losses by considering a number of factors, including the credit risk of specific customers, the customer’s ability to pay current obligations, historical trends, economic and market conditions, and the age of the receivable. Accounts are considered past due when the balance has been outstanding for ninety days past negotiated credit terms. Past due accounts are generally written-off against the allowance for credit losses only after all collection attempts have been exhausted.
Concentration of Credit Risk
Our customers are concentrated primarily in the domestic commercial and industrial new construction and replacement markets. To date, our sales have been primarily to the domestic market, with foreign sales accounting for approximately 3%, 2%, and 3% of revenues for the years ended December 31, 2021, 2020, and 2019, respectively.
One customer, Texas AirSystems LLC, accounted for more than 10% of our sales during 2021, 2020, and 2019. No other customer accounted for more than 10% of our sales during 2021, 2020, and 2019. No customers accounted for more than 10% of our accounts receivable balance at December 31, 2021. Two customers, Texas AirSystems LLC and Johnson Barrow Inc., accounted for more than 10% of our accounts receivable balance at December 31, 2020.
Inventories
Inventories are valued at the lower of cost or net realizable value using the first-in, first-out (“FIFO”) or average cost method. Cost in inventory includes purchased parts and materials, direct labor and applied manufacturing overhead. We establish an allowance for excess and obsolete inventories based on product line changes, the feasibility of substituting parts and the need for supply and replacement parts.
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Property, Plant and Equipment
Property, plant, and equipment, including significant improvements, are recorded at cost, net of accumulated depreciation; except for property, plant, and equipment acquired in a business combination which is recorded at fair value. Repairs and maintenance and any gains or losses on disposition are included in operations.
Depreciation is computed using the straight-line method over the following estimated useful lives:

Buildings | 3 - 40 years
Machinery and equipment | 3 - 20 years
Furniture and fixtures | 3 - 15 years

On April 22, 2020, our plant and office facilities in Tulsa, Oklahoma experienced hail related weather damage and we filed a property insurance claim which carried a $500,000 deductible. We did not experience any significant structural damage or any operational interruption as a result of this weather event. In November 2020, we reached a final settlement with our insurance carrier, resulting in a net cumulative gain of $6.4 million, which is included in the consolidated statements of income. The received proceeds will be used in future periods to make improvements to the current roof at our plant and office facilities in Tulsa, Oklahoma to extend the overall useful life.
Business Combinations
The Company applies the acquisition method of accounting for business acquisitions. The results of operations of the businesses acquired by the Company are included as of the respective acquisition date. The acquisition-date fair value of the consideration transferred, including the fair value of any contingent consideration, is allocated to the underlying assets acquired and liabilities assumed based upon their estimated fair values at the date of acquisition. To the extent the acquisition-date fair value of the consideration transferred exceeds the fair value of the identifiable tangible and intangible assets acquired and liabilities assumed, such excess is allocated to goodwill. The Company may adjust the preliminary purchase price allocation, as necessary, as it obtains more information regarding asset valuations and liabilities assumed that existed but were not available at the acquisition date, which is generally up to one year after the acquisition closing date. Acquisition related expenses are recognized separately from the business combination and are expensed as incurred.
Fair Value Financial Instruments and Measurements
The carrying amounts of cash and cash equivalents, receivables, accounts payable, and accrued liabilities approximate fair value because of the short-term maturity of the items. The carrying amount of the Company’s revolving line of credit, and other payables, approximate their fair values either due to their short term nature, the variable rates associated with the debt or based on current rates offered to the Company for debt with similar characteristics.
We adopted ASU No. 2018-13, Fair Value Measurements (Topic 820), as amended, as of January 1, 2020. The ASU includes additional disclosure requirements for unrealized gains and losses for Level 3 fair value measurements and significant observable inputs used to develop Level 3 fair value measurements. There was not a material impact to financial statements upon adoption. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Fair value is based upon assumptions that market participants would use when pricing an asset or liability. We use the following fair value hierarchy, which prioritizes valuation technique inputs used to measure fair value into three broad levels:
•Level 1: Quoted prices in active markets for identical assets and liabilities that we have the ability to access at the measurement date.
•Level 2: Inputs (other than quoted prices included within Level 1) that are either directly or indirectly observable for the asset or liability, including (i) quoted prices for similar assets or liabilities in active markets, (ii) quoted prices for identical or similar assets or liabilities in inactive markets, (iii) inputs other than quoted prices that are observable for the asset or liability, and (iv) inputs that are derived from observable market data by correlation or other means.
•Level 3: Unobservable inputs for the asset or liability including situations where there is little, if any, market activity for the asset or liability. Items categorized in Level 3 include the estimated fair values of
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property, plant and equipment, intangible assets, contingent consideration, and goodwill acquired in a business combination.
The fair value hierarchy gives the highest priority to quoted prices in active markets (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall into different levels of the fair value hierarchy. The lowest level input that is significant to a fair value measurement determines the applicable level in the fair value hierarchy. Assessing the significance of a particular input to a fair value measurement requires judgment, considering factors specific to the asset or liability.
Definite-Lived Intangible Assets
Our definite-lived intangible assets include various trademarks, service marks, and technical knowledge acquired in business combinations (Note 4). We amortize our definite-lived intangible assets on a straight-line basis over the estimated useful lives of the assets. We evaluate the carrying value of our amortizable intangible assets for potential impairment when events and circumstances warrant such a review.
Amortization is computed using the straight-line method over the following estimated useful lives:

Intellectual property | 30 years
Customer relationships | 14 years

Goodwill and Indefinite-Lived Intangible Assets
Goodwill represents the excess of the consideration paid for the acquired businesses over the fair value of the individual assets acquired, net of liabilities assumed. At December 31, 2021, approximately $19.7 million of goodwill Indefinite-lived intangible assets consist of trademarks and trade names and are also subject to at least annual impairment testing. Goodwill and indefinite-lived intangible assets are not amortized, but instead are evaluated for impairment at least annually. We perform our annual assessment of impairment during the fourth quarter of our fiscal year, and more frequently if circumstances warrant.
To perform this assessment, we first consider qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit and indefinite-lived intangible assets exceeds their carrying amount. If we conclude that it is more likely than not that the fair value of a reporting unit and indefinite-lived assets does not exceed their carrying amount, we calculate the fair value for the report unit and indefinite-lived assets and compare the amount to their carrying amount. If the fair value of a reporting unit and indefinite-lived asset exceeds their carrying amount, the reporting unit and indefinite-lived assets are not considered impaired. If the carrying amount of the reporting unit and indefinite-lived assets exceeds their fair value, the reporting unit and indefinite-lived assets are considered to be impaired and the balance is reduced by the difference between the fair value and carrying amount of the reporting unit and indefinite-lived assets.
We performed a qualitative assessment as of December 31, 2021 to determine whether it was more likely than not that the fair value of the reporting unit and indefinite-lived assets was greater than the carrying value of the reporting unit and indefinite-lived assets. Based on these qualitative assessments, we determined that the fair value of the reporting unit and indefinite-lived assets was more likely than not greater than the carrying value of the reporting unit and indefinite-lived assets.
Estimates and assumptions used to perform the impairment evaluation are inherently uncertain and can significantly affect the outcome of the analysis. The estimates and assumptions we use in the annual impairment assessment included market participant considerations and future forecasted operating results. Changes in operating results and other assumptions could materially affect these estimates. A considerable amount of management judgment and assumptions are required in performing the impairment tests.
Contingent Consideration
As part of a business combination, we agreed to issue shares of the Company's common stock based on certain milestones in accordance with the acquisition agreement. This contingent consideration is valued at fair value on the acquisition date and is included in additional paid-in capital on the consolidated balance sheets.
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Impairment of Long-Lived Assets
We review long-lived assets for possible impairment when events or changes in circumstances indicate, in management’s judgment, that the carrying amount of an asset may not be recoverable. Recoverability is measured by a comparison of the carrying amount of an asset or asset group to its estimated undiscounted future cash flows expected to be generated by the asset or asset group. If the undiscounted cash flows are less than the carrying amount of the asset or asset group, an impairment loss is recognized for the amount by which the carrying amount of the asset or asset group exceeds its fair value.
Research and Development
The costs associated with research and development for the purpose of developing and improving new products are expensed as incurred. For the years ended December 31, 2021, 2020, and 2019 research and development costs amounted to approximately $16.6 million, $17.4 million, and $14.8 million, respectively.
Advertising
Advertising costs are expensed as incurred. Advertising expense for the years ended December 31, 2021, 2020, and 2019 was approximately $1.6 million, $0.8 million, and $0.8 million, respectively.
Shipping and Handling
We incur shipping and handling costs in the distribution of products sold that are recorded in cost of sales. Shipping charges that are billed to the customer are recorded in revenues and as an expense in cost of sales. For the years ended December 31, 2021, 2020, and 2019 shipping and handling fees amounted to approximately $14.4 million, $14.3 million, and $14.4 million, respectively.
Income Taxes
Income taxes are accounted for under the asset and liability method. The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the book carrying amounts and the tax basis of assets and liabilities. Excess tax benefits and deficiencies are reported as an income tax benefit or expense on the statement of income and are treated as discrete items to the income tax provision in the reporting period in which they occur. We establish accruals for unrecognized tax positions when it is more likely than not that our tax return positions may not be fully sustained. The Company records a valuation allowance for deferred tax assets when, in the opinion of management, it is more likely than not that deferred tax assets will not be realized.
Share-Based Compensation
The Company recognizes expense for its share-based compensation based on the fair value of the awards that are granted. The Company’s share-based compensation plans provide for the granting of stock options, restricted stock, and performance stock units ("PSUs"). In conjunction with the acquisition of BasX (Note 4), we awarded performance awards to key employees ("Key Employee Awards") of BasX.
The fair values of stock options are estimated at the date of grant using the Black-Scholes-Merton option valuation model. The fair value of the PSUs is estimated on the date of grant using the Monte Carlo Model. The use of the Black-Scholes-Merton option valuation model and the Monte Carlo Model requires the input of subjective assumptions such as: the expected volatility, the expected term of the grant, expected market performance, risk-free rate, and expected dividend yield for stock options. The fair va lue of restricted stock awards and Key Employee Awards is based on the fair market value of AAON common stock on the respective grant dates. The fair value of restricted stock awards is reduced for the present value of dividends. The Key Employee Awards do not accrue dividends.
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Share-based compensation expense is recognized on a straight-line basis over the service period of the related share-based compensation award. Historically, stock options and restricted stock awards, granted to employees, vest at a rate of 20% per year. Restricted stock awards granted to directors historically vest one-third each year or, if granted on or after May 2019, vest over the shorter of directors' remaining elected term or one-third each year. As of March 2021, all new grants of stock options and restricted stock awards, granted to employees, vest at a rate of 33.3% per year. Forfeitures are accounted for as they occur.
Historically, if the employee or director is retirement eligible (as defined by the Long Term Incentive Plans) or becomes retirement eligible during service period of the related share-based compensation award, the service period is the lesser of 1) the grant date, if retirement eligible on grant date, or 2) the period between grant date and retirement eligible date. All share-based compensation awards granted on or after March 1, 2020 to retirement eligible employees or directors contain a one-year employment requirement (minimum service period) or the entire award is forfeited. Forfeitures are accounted for as they occur.
The PSUs cliff vest on December 31, 2023. Share-based compensation expense is recognized on a straight-line basis over the service period of PSUs. The PSUs are subject to several service and market conditions, as defined by the PSU agreement, which allows the holder to retain a pro-rata amount of awards as a result of certain termination conditions, retirement, change in common control, or death. Forfeitures are accounted for as they occur.
The Key Employee Awards cliff vest on December 31, 2023. Share-based compensation expense is recognized on a straight-line basis over the service period of the Key Employee Awards when it is probable that the performance conditions will be satisfied. The Key Employee Awards are subject to several service and performance conditions, as defined by the Key Employee Award agreement, which allows the holder to retain an amount of the awards as a result of certain termination conditions or change in common control. Forfeitures are accounted for as they occur.
Derivative Instruments
In the course of normal operations, the Company occasionally enters into contracts such as forward priced physical contracts for the purchase of raw materials that qualify for and are designated as normal purchase or normal sale contracts. Such contracts are exempted from the fair value accounting requirements and are accounted for at the time product is purchased or sold under the related contract. The Company does not engage in speculative transactions, nor does the Company hold or issue financial instruments for trading purposes.
Revenue Recognition
Due to the highly customized nature of many of the Company’s products and each product not having an alternative use to the Company without significant costs to the Company, the Company recognizes revenue over time as progress is made toward satisfying the performance obligations of each contract. The Company has formal cancellation policies and generally does not accept returns on these units. As a result, many of the Company’s products do not have an alternative use and therefore, for these products we recognize revenue over the time it takes to produce the unit. The Company measures a contract’s progress on the basis of the ratio that costs incurred bear to estimated total costs using the input method because, in the Company’s view, such method best depicts the progress toward completion.
Contract costs include direct materials, direct labor, installation, freight and delivery, commissions and royalties. Other costs not related to contract performance, such as indirect labor and materials, small tools and supplies, operating expenses, field rework and back charges are charged to expense as incurred. Provisions for estimated losses on contracts in progress are made in the period in which such losses are determined. Changes in job performance, job conditions, and estimated profitability, including those arising from contract penalty provisions and final contract settlements, may result in revisions to costs and income, and are estimated and recognized by the Company throughout the life of the contract. The aggregate of costs incurred and income recognized on uncompleted contracts in excess of billings is shown as a contract asset within our consolidated balance sheets, and the aggregate of billings on uncompleted contracts in excess of related costs incurred and income recognized is shown as a contract liability within out consolidated balance sheets.
For all other products that are part sales or standardized units, the Company recognizes revenue, presented net of sales tax, when it satisfies the performance obligation in its contracts. As the primary performance obligation in such a contract is delivery of the requested manufactured equipment, we satisfy the performance obligation when the
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control is passed to the customer, generally at time of shipment. Final sales prices are fixed based on purchase orders.
Sales allowances and customer incentives are treated as reductions to sales and are provided for based on historical experiences and current estimates. Sales of our products are moderately seasonal with the peak period being May-October of each year.
The Company also sells extended warranties on parts for various lengths of time ranging from six months to 10 years. Revenue for these separately priced warranties is deferred and recognized on a straight-line basis over the separately priced warranty period.
Representatives and Third Party Products
We are responsible for billings and collections resulting from all sales transactions, including those initiated by our independent manufacturer representatives (“Representatives”). Representatives are national companies that are in the business of providing heating, ventilation, and air conditioning (“HVAC”) units and other related products and services to customers. The end user customer orders a bundled group of products and services from the Representative and expects the Representative to fulfill the order. These other related products and services may include controls purchased from another manufacturer to operate the unit, start-up services, and curbs for supporting the unit (“Third Party Products”). All are associated with the purchase of a HVAC unit but may be provided by the Representative or another third party. Only after the specifications are agreed to by the Representative and the customer, and the decision is made to use an AAON HVAC unit, will we receive notice of the order. We establish the amount we must receive for our HVAC unit (“minimum sales price”), but do not control the total order price that is negotiated by the Representative with the end user customer. The Representatives submit the total order price to us for invoicing and collection. The total order price includes our minimum sales price and an additional amount which may include both the Representatives’ fee and amounts due for additional products and services required by the customer. The Company is considered the principal for the equipment we design and manufacture and records that revenue gross. The Company has no control over the Third Party Products to the end customer and the Company is under no obligation related to the Third Party Products. Amounts related to Third Party Products are not recognized as revenue but are recorded as a liability and are included in accrued liabilities on the consolidated balance sheets.
The Representatives’ fee and Third Party Products amounts (“Due to Representatives”) are paid only after all amounts associated with the order are collected from the customer. The amount of payments to our representatives was $43.9 million, $50.0 million, and $46.1 million for each of the years ended December 31, 2021, 2020, and 2019, respectively.
Insurance Reserves
Under the Company’s insurance programs, coverage is obtained for significant liability limits as well as those risks required to be insured by law or contract. It is the policy of the Company to self-insure a portion of certain expected losses related primarily to workers’ compensation and medical liability. Provisions for losses expected under these programs are recorded based on the Company’s estimates of the aggregate liabilities for the claims incurred.
Product Warranties
A provision is made for the estimated cost of maintaining product warranties to customers at the time the product is sold based upon historical claims experience by product line. The Company records a liability and an expense for estimated future warranty claims based upon historical experience and management’s estimate of the level of future claims. Changes in the estimated amounts recognized in prior years are recorded as an adjustment to the liability and expense in the current year.
Use of Estimates
The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Because these estimates and assumptions require significant judgment, actual results could differ
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from those estimates and could have a significant impact on our results of operations, financial position, and cash flows. We reevaluate our estimates and assumptions as needed, but at a minimum on a quarterly basis. The most significant estimates include, but are not limited to: revenue recognition, business combinations, the allowance for credit losses, inventory reserves, warranty accrual, workers compensation accrual, medical insurance accrual, share-based compensation, and income taxes. Actual results could differ materially from those estimates.
3. Revenue Recognition
The following tables show disaggregated net sales by reportable segment (see Note 23) by major source, net of intercompany sales eliminations. As the BasX segment was not applicable during the years ended December 31, 2020 and 2019, this segment has been excluded from the tables.
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| Year Ended December 31, 2021
| AAON Oklahoma |  | AAON Coil Products |  | BasX 1 |  | Total
| (in thousands)
Rooftop Units | $ | 398,461 |  |  | $ | — |  |  | $ | — |  |  | $ | 398,461 |
Condensing Units | 762 |  |  | 25,989 |  |  | — |  |  | 26,751 |
Air Handlers | — |  |  | 26,589 |  |  | 95 |  |  | 26,684 |
Outdoor Mechanical Rooms | 820 |  |  | 464 |  |  | — |  |  | 1,284 |
Cleanroom Systems | — |  |  | — |  |  | 2,288 |  |  | 2,288 |
Data Center Cooling Solutions | — |  |  | — |  |  | 1,688 |  |  | 1,688 |
Water-Source Heat Pumps | 10,831 |  |  | 10,343 |  |  | — |  |  | 21,174 |
Part Sales | 41,127 |  |  | 1 |  |  | — |  |  | 41,128 |
Other | 11,844 |  |  | 3,203 |  |  | 12 |  |  | 15,059 |
| $ | 463,845 |  |  | $ | 66,589 |  |  | $ | 4,083 |  |  | $ | 534,517 |
| Year Ended December 31, 2020
| AAON Oklahoma |  | AAON Coil Products |  | BasX 1 |  | Total
| (in thousands)
Rooftop Units | $ | 400,946 |  |  | $ | — |  |  | — |  | $ | 400,946 |
Condensing Units | 900 |  |  | 20,249 |  |  | — |  | 21,149 |
Air Handlers | — |  |  | 23,931 |  |  | — |  | 23,931 |
Outdoor Mechanical Rooms | 2,355 |  |  | 487 |  |  | — |  | 2,842 |
Water-Source Heat Pumps | 10,663 |  |  | 8,390 |  |  | — |  | 19,053 |
Part Sales | 32,561 |  |  | — |  |  | — |  | 32,561 |
Other | 11,532 |  |  | 2,537 |  |  | — |  | 14,069 |
| $ | 458,957 |  |  | $ | 55,594 |  |  | — |  | $ | 514,551 |
| Year Ended December 31, 2019
| AAON Oklahoma |  | AAON Coil Products |  | BasX 1 |  | Total
| (in thousands)
Rooftop Units | $ | 349,427 |  |  | $ | — |  |  | — |  | $ | 349,427 |
Condensing Units | 865 |  |  | 17,610 |  |  | — |  | 18,475 |
Air Handlers | — |  |  | 24,265 |  |  | — |  | 24,265 |
Outdoor Mechanical Rooms | 1,134 |  |  | 509 |  |  | — |  | 1,643 |
Water-Source Heat Pumps | 21,076 |  |  | 4,371 |  |  | — |  | 25,447 |
Part Sales | 33,331 |  |  | — |  |  | — |  | 33,331 |
Other | 12,836 |  |  | 3,909 |  |  | — |  | 16,745 |
| $ | 418,669 |  |  | $ | 50,664 |  |  | — |  | $ | 469,333 |
1 BasX was acquired by the Company on December 10, 2021, as such, the only applicable period presented for BasX is December 11, 2021 through December 31, 2021.

Other sales include freight, extended warranties and miscellaneous revenue.
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4. Business Combination
On November 18, 2021, the Company entered into a membership interest purchase agreement (the “MIPA Agreement”) to acquire of all of the issued and outstanding equity ownership of BasX, LLC, an Oregon limited liability company, doing business as BasX Solutions. We closed this transaction on December 10, 2021 for a purchase price of (i) $100.0 million payable in cash (not including working capital adjustments), and (ii) up to $80.0 million in the aggregate of contingent consideration payable in shares of the Company's stock, par value $0.004 per share (the "Shares").
The $80.0 million of contingent consideration payable consists of $78.0 million payable to the former owners of BasX and $2.0 million payable to key employees of BasX whom are now employed by the Company. The potential future issuance of the Shares is contingent upon BasX meeting certain post-closing earn-out milestones during each of 2021, 2022, and 2023 under the terms of the MIPA Agreement. The Company funded the BasX acquisition cash portion of the purchase price and related transaction costs with cash on hand.
Additionally, as a condition to closing, the Company entered into a real estate purchase agreement with BasX Properties, LLC, an affiliate of BasX, to acquire the principal real property and improvements utilized by BasX for an additional $22.0 million, subject to customary closing conditions and adjustments. The Company expects this real estate transaction to close by the end of the first quarter of 2022.
BasX specializes in the design, engineering and manufacturing of custom, energy efficient cooling solutions for the rapidly growing hyperscale data center market. BasX also designs and manufactures custom solutions for cleanroom environments for the bio-pharmaceutical, semiconductor, medical and agriculture markets, as well as custom, energy efficient air handlers and modular solutions for a vast array of markets. The acquisition of BasX brings the Company exposure to attractive end-markets into which the Company has historically had minimal exposure. The products BasX manufactures are highly engineered, customized products, fully complimenting AAON's existing business.
We incurred $4.4 million in transaction fees related to the acquisition of BasX which are included in selling, general, and administrative expenses on our consolidated statement of income. We have included the results of BasX’s operations in our consolidated financial statements beginning December 11, 2021.
We applied pushdown accounting, allowable under ASC 805 "Business Combinations," to "pushdown" our stepped-up basis in the assets acquired and liabilities assumed to BasX's subsidiary financial statements. The decision to apply pushdown accounting is irrevocable. Goodwill was calculated and recognized consistent with acquisition accounting, resulting in the pushdown of $82.5 million in goodwill as of December 31, 2021.
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The following table presents the allocation of the consideration paid to the assets acquired and liabilities assumed, based on their fair values as of December 10, 2021, in the acquisition of BasX described above, which was still preliminary at December 31, 2021. The provisional amounts are subject to change as the Company continues to evaluate the information required to complete the valuation through the measurement period. We expect to complete our valuation in the first quarter of 2022.

| (in thousands)
Accounts receivable | $ | 13,699 |
Inventories | 2,725 |
Contract assets | 7,635 |
Prepaid expenses and other | 341 |
Property, plant and equipment | 13,169 |
Right of use assets | 15,611 |
Intangible assets | 70,329 |
Goodwill | 82,498 |
Accounts payable | (9,388) |
Accrued liabilities | (3,807) |
Contract liabilities | (7,771) |
Lease liabilities | (15,611) |
Contingent Consideration - shares of AAON | (66,000) |
Consideration paid | $ | 103,430 |

The Company recognized the following definite and indefinite-lived intangible assets as part of the acquisition of BasX:

| (in thousands)
Definite-lived intangible assets |
Intellectual property | $ | 6,479 |
Customer relationships | 48,684 |
| 55,163 |
Indefinite-lived intangible assets |
Trademarks | 15,166 |
Total intangible assets acquired | $ | 70,329 |

Goodwill is the excess of the consideration paid for the acquired businesses over the fair value of the individual assets acquired, net of liabilities assumed. Goodwill represents a premium paid to acquire the skilled workforce and expanded market opportunities. Goodwill of $16.5 million is tax deductible upon close of the acquisition. Future additional amounts of goodwill related to the contingent consideration may become tax deductible in the future if the earn out provisions of the MIPA are achieved.
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Pro Forma Results of Operations (unaudited)
The operations of BasX have been included in our statements of income since the closing date on December 10, 2021. The following unaudited pro forma consolidated results of operations for the years ended December 31, 2021 and 2020 are presented as if the combination had been made on January 1, 2020.

| (unaudited)
| Years ended December 31,
| 2021 |  | 2020
| (in thousands, except per share data)
Revenues | $ | 611,158 |  |  | $ | 562,563 |
Net income | 63,491 |  |  | 80,507 |
Earnings per share: |  |  |
Basic | $ | 1.21 |  |  | $ | 1.54 |
Dilutive | $ | 1.18 |  |  | $ | 1.52 |

These unaudited pro forma results include adjustments necessary in connection with the acquisition.
The unaudited consolidated pro forma financial information was prepared in accordance with GAAP and is not necessarily indicative of the results of operations that would have occurred if the acquisition had been completed on the date indicated, nor is it indicative of the future operating results of the Company.
The unaudited pro forma results do not reflect events that either have occurred or may occur after the acquisition date, including, but not limited to, the anticipated realization of operating synergies in subsequent periods. These results also do not give effect to certain charges that the Company expects to incur in connection with the acquisition, including, but not limited to, additional professional fees and employee integration.
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5. Leases
We adopted ASU No. 2016-02, Leases (Topic 842), as amended, as of January 1, 2019, using the transition method, which became effective upon the date of adoption. The transition method allows entities to initially apply the new leases standard at the adoption date (January 1, 2019) and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to carry forward the historical lease classification. We have also elected the short-term lease measurement and recognition exemption which does not require balance sheet presentation for short-term leases.
All of our leases are classified as operating leases. As our leases do not provide an implicit interest rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. Our incremental borrowing rate represents the interest rate which we would pay to borrow, on a collateralized basis, an amount equal to the lease payments over a similar term in a similar economic environment.
We have entered into various short-term operating leases with an initial term of twelve months or less. These leases are not recorded on our consolidated balance sheets as of December 31, 2021 or 2020, and the rent expense for these short-term leases is not significant.
The Company’s leases generally require us to pay for insurance, taxes, utilities, and other operating costs. These payments are not included in the right-of-use asset or lease liability and are expensed as incurred.
Through the acquisition of BasX (Note 4), we acquired various leases for plant/office space and equipment. We also lease the plant/office space used by our operations in Parkville, MO. Expense related to these leases is recognized on straight-line basis over the lease term. Certain of our leases contain escalating lease payments based on predefined increases. Most leases contain options to renew or terminate. Right-of-use assets and lease liabilities reflect only the options which the Company is reasonably certain to exercise.
At December 31, 2021, we had operating lease right-of-use assets of $17.0 million and current and noncurrent operating lease obligations of $1.6 million and $15.5 million within accrued liabilities and other long-term liabilities, respectively, on our consolidated balance sheets. At December 31, 2020, we had operating lease right-of-use assets of $1.6 million and current and noncurrent operating lease obligations of $0.2 million and $1.4 million within accrued liabilities and other long-term liabilities, respectively, on our consolidated balance sheets.
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6. Accounts Receivable
Accounts receivable and the related allowance for credit losses are as follows:

| December 31,
| 2021 |  | 2020
| (in thousands)
Accounts receivable | $ | 71,329 |  |  | $ | 47,893 |
Less: Allowance for credit losses | (549) |  |  | (506) |
Total, net | $ | 70,780 |  |  | $ | 47,387 |

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Allowance for credit losses: | (in thousands)
Balance, beginning of period | $ | 506 |  |  | $ | 353 |  |  | $ | 264 |
Provisions (recoveries) for expected credit losses, net of adjustments | 43 |  |  | 153 |  |  | 91 |
Accounts receivable written off, net of recoveries | — |  |  | — |  |  | (2) |
Balance, end of period | $ | 549 |  |  | $ | 506 |  |  | $ | 353 |

7. Inventories
The components of inventories and the related changes in the allowance for excess and obsolete inventories are as follows:

| December 31,
| 2021 |  | 2020
| (in thousands)
Raw materials | $ | 124,480 |  |  | $ | 76,238 |
Work in process | 3,049 |  |  | 2,088 |
Finished goods | 4,528 |  |  | 7,154 |
| 132,057 |  |  | 85,480 |
Less: Allowance for excess and obsolete inventories | (1,787) |  |  | (3,261) |
Total, net | $ | 130,270 |  |  | $ | 82,219 |

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Allowance for excess and obsolete inventories: | (in thousands)
Balance, beginning of period | $ | 3,261 |  |  | $ | 2,644 |  |  | $ | 1,210 |
Provisions for excess and obsolete inventories | 629 |  |  | 1,108 |  |  | 1,454 |
Inventories written off | (2,103) |  |  | (491) |  |  | (20) |
Balance, end of period | $ | 1,787 |  |  | $ | 3,261 |  |  | $ | 2,644 |

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8. Intangible Assets
Our intangible assets consist of the following:

| December 31,
| 2021 |  | 2020
Definite-lived intangible assets | (in thousands)
Intellectual property | $ | 6,479 |  |  | $ | 700 |
Customer relationships | 48,684 |  |  | — |
Less: Accumulated amortization | (208) |  |  | (662) |
Total, net | 54,955 |  |  | 38 |
Indefinite-lived intangible assets |  |  |
Trademarks | 15,166 |  |  | — |
Total intangible assets, net | $ | 70,121 |  |  | $ | 38 |

Amortization expense recorded in cost of sales is as follows:

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Amortization expense | $ | 246 |  |  | $ | 234 |  |  | $ | 234 |

Excluding the impact of any future acquisitions, the Company anticipates amortization expense to be $3.7 million for each of the years ended 2022 through 2026.
9. Note Receivable
In connection with the closure of our Canadian facility on May 18, 2009, we sold land and a building in September 2010 and assumed a note receivable from the borrower secured by the property. The C$1.1 million, 15 year note has an interest rate of 4.0% and is payable to us monthly, and has a C$0.6 million balloon payment due in October 2025. Interest payments are recognized in interest income. The current and long-term portions of this note receivable are included in other prepaid expenses and other and other long-term assets, respectively, on our balance sheet.
We evaluate the note for impairment on a quarterly basis. We determine the note receivable to be impaired if we are uncertain of its collectability based on the contractual terms. At December 31, 2021 and 2020, there was no impairment.
10. Supplemental Cash Flow Information

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Supplemental disclosures: | (in thousands)
Interest paid | $ | — |  |  | $ | — |  |  | $ | — |
Income taxes paid, net | 7,891 |  |  | 13,754 |  |  | 2,172 |
Non-cash investing and financing activities: |  |  |  |  |
Non-cash capital expenditures | (3,714) |  |  | 2,843 |  |  | 863 |

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11. Warranties
The Company has warranties with various terms from 18 months for parts, data center cooling solutions, and cleanroom systems to 25 years for certain heat exchangers. The Company has an obligation to replace parts if conditions under the warranty are met. A provision is made for estimated warranty costs at the time the related products are sold based upon the warranty period, historical trends, new products, and any known identifiable warranty issues.
Changes in the warranty accrual are as follows:

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Warranty accrual: | (in thousands)
Balance, beginning of period | $ | 13,522 |  |  | $ | 12,652 |  |  | $ | 11,421 |
Payments made | (6,734) |  |  | (5,751) |  |  | (6,816) |
Provisions | 6,351 |  |  | 6,621 |  |  | 8,047 |
Assumed in business combination (Note 4) | 630 |  |  | — |  |  | — |
Balance, end of period | $ | 13,769 |  |  | $ | 13,522 |  |  | $ | 12,652 |
Warranty expense: | $ | 6,351 |  |  | $ | 6,621 |  |  | $ | 8,047 |

12. Accrued Liabilities and Other Long-Term Liabilities
At December 31, accrued liabilities were comprised of the following:

| December 31,
| 2021 |  | 2020
| (in thousands)
Warranty | $ | 13,769 |  |  | $ | 13,522 |
Due to representatives | 7,995 |  |  | 8,296 |
Payroll | 8,423 |  |  | 8,155 |
Profit sharing | 1,489 |  |  | 2,902 |
Workers' compensation | 308 |  |  | 594 |
Medical self-insurance | 1,943 |  |  | 1,546 |
Customer prepayments | 5,931 |  |  | 5,067 |
Donations, short-term | 438 |  |  | 570 |
Employee vacation time | 4,362 |  |  | 3,321 |
Operating lease liability, short-term | 1,580 |  |  | 202 |
Other | 3,968 |  |  | 2,411 |
Total | $ | 50,206 |  |  | $ | 46,586 |

At December 31, other long-term liabilities were comprised of the following:

| December 31,
| 2021 |  | 2020
| (in thousands)
Long-term operating lease obligation | $ | 15,467 |  |  | $ | 1,369 |
Long-term donations | 334 |  |  | 496 |
Extended warranties | 3,042 |  |  | 2,558 |
Total | $ | 18,843 |  |  | $ | 4,423 |

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13. Revolving Credit Facility
On November 24, 2021, we amended our revolving credit facility (“Revolver”), to provide for maximum borrowings of $100.0 million, with an option to increase to maximum borrowing of $200.0 million. As of December 31, 2021, we had a $40.0 million balance outstanding under the Revolver. We have one standby letter of credit totaling $1.8 million as of December 31, 2021 and 2020. Borrowings available under the Revolver at December 31, 2021, were $58.2 million. The Revolver expires on November 24, 2026.
Any outstanding loans under the Revolver bear interest at the daily compounded secured overnight financing rate ("SOFR") plus the applicable margin. Applicable margin, ranging from 1.25% - 1.75%, is determined quarterly based on the Company's leverage ratio. The Company is also subject to letter of credit fees, ranging from 1.25% - 1.75%, and a commitment fee, ranging from 0.10% - 0.20%. The applicable fee percentage is determined quarterly based on the Company's leverage ratio. At December 31, 2021, the weighted average interest rate of our the Revolver was 1.3%. Fees associated with the unused portion of the committed amount are included in interest expense on our consolidated statements of income and were not material for the year ended December 31, 2021.
If SOFR cannot be determined pursuant to the definition, as defined by the Revolver agreement, any outstanding effected loans will be deemed to have been converted into alternative base rate ("ABR") loans. ABR loans would bear interest at a rate per annum equal to the highest of (a) the Prime Rate in effect on such day, (b) the Federal Funds Rate in effect on such day plus 0.50%, or (c) daily simple SOFR for a one-month tenor in effect on such day plus 1.00%.
At December 31, 2021, we were in compliance with our financial covenants, as defined by the Revolver. These covenants require that we meet certain parameters related to our leverage ratio. At December 31, 2021, our leverage ratio was 0.42 to 1.0, which meets the requirement of not being above 3 to 1.
The previous revolving credit facility allowed for maximum borrowings of $30.0 million with an interest rate of LIBOR plus 2.0%. There were no fees associated with the unused portion of committed amounts under the previous revolving credit facility. As of December 31, 2020, we had no balance outstanding under our previous revolving credit facility. At December 31, 2020, the weighted average interest rate of our revolving credit facility was 2.6%.
On January 18, 2022, we updated our standby letter of credit to $820,000. As of February 28, 2022, we had $55,000,000 of outstanding borrowings under our Revolver.
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14. Income Taxes
The provision for income taxes consists of the following:

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Current | $ | 6,755 |  |  | $ | 9,939 |  |  | $ | 7,282 |
Deferred | 3,669 |  |  | 13,027 |  |  | 6,038 |
Total | $ | 10,424 |  |  | $ | 22,966 |  |  | $ | 13,320 |

The provision for income taxes differs from the amount computed by applying the statutory federal income tax rate before the provision for income taxes.
The reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Federal statutory rate | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State income taxes, net of federal benefit | 1.8 | % |  | 5.3 | % |  | 5.2 | %
Change in valuation allowance | 1.0 | % |  | — | % |  | — | %
Excess tax benefits related to share-based compensation | (7.8) | % |  | (3.2) | % |  | (2.6) | %
Return to provision | — | % |  | 0.1 | % |  | (1.4) | %
Oklahoma amended tax returns | — | % |  | — | % |  | (1.3) | %
Other | (0.9) | % |  | (0.7) | % |  | (0.9) | %
| 15.1 | % |  | 22.5 | % |  | 20.0 | %

On May 21, 2021, the State of Oklahoma enacted House Bill 2960, effectively reducing the corporate income tax rate in Oklahoma from 6% to 4%. As a result of these changes, the Company adjusted its state deferred tax assets and liabilities in the second quarter of 2021 using the newly enacted rate for the periods when they are expected to be realized. This resulted in a benefit of $0.8 million included in the table above under State income taxes, net of Federal benefit, for the year ending December 31, 2021.
During the year ending December 31, 2021, the Company recorded an excess tax benefit of $5.4 million as compared to $3.2 million during 2020, an increase of 68.8%. The increase was primarily due to timing of stock option exercises as a result of our high stock price during the three months ended March 31, 2021 and three months ended December 31, 2021.
We earn investment tax credits from the state of Oklahoma’s investment tax credit program for generally 1% of the qualified assets to be taken over 5 years. We use the flow-through method of accounting for the investment tax credits. We have credit carryforwards totaling $3.7 million that have estimated expirations starting in 2035.
Upon completion of the Company's 2018 tax return in 2019, the Company recorded additional benefit due to higher than expected research and development credit of $0.6 million. Additionally in 2019, the Company determined it could take advantage of an additional 1% tax credit in Oklahoma for years in which the Company's location was deemed to be within an enterprise zone. The additional Oklahoma credit for being in an enterprise zone, or otherwise allowable under Oklahoma law, resulted in a benefit of $1.2 million.
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amount used for income tax purposes.
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The significant components of the Company’s deferred tax assets and liabilities are as follows:

| December 31,
| 2021 |  | 2020
| (in thousands)
Deferred income tax assets (liabilities): |  |
Accounts receivable and inventory reserves | $ | 625 |  |  | $ | 1,052 |
Warranty accrual | 3,675 |  |  | 3,776 |
Other accruals | 1,406 |  |  | 1,044 |
Share-based compensation | 7,568 |  |  | 4,102 |
Intangibles | 993 |  |  | (33) |
Oklahoma investment credit carryforward | 3,404 |  |  | — |
Other, net | 3,119 |  |  | 2,608 |
| 20,790 |  |  | 12,549 |
Valuation allowance | (3,404) |  |  | — |
Net deferred income tax assets | 17,386 |  |  | 12,549 |
Property & equipment | (49,379) |  |  | (40,873) |
Total deferred income tax liabilities | (49,379) |  |  | (40,873) |
Net deferred income tax liabilities | $ | (31,993) |  |  | $ | (28,324) |

Realization of deferred tax assets, including the associated credit carryforwards, is dependent upon generating sufficient taxable income in the appropriate tax jurisdiction. We believe that it is more likely than not that we may not realize the benefit of our Oklahoma investment tax credit carryforward and, accordingly, have established a valuation allowance against this deferred tax asset.
The amount of income tax that we pay annually is dependent on various factors, including the timing of certain deductions. These deductions can vary from year to year and, consequently, the amount of income taxes paid in future years will vary from the amounts paid in prior years.
We file income tax returns in the U.S. and state tax returns jurisdictions. We are subject to U.S. examinations for tax years 2018 to present. In addition, we are subject to state and local income tax examinations for tax years 2017 to present. The Company continues to evaluate its need to file returns in various state jurisdictions. Any interest or penalties would be recognized as a component of income tax expense.
15. Share-Based Compensation
On May 22, 2007, our stockholders adopted a Long-Term Incentive Plan (as amended, “LTIP”) which provided an additional 3.3 million shares that could be granted in the form of stock options, stock appreciation rights, restricted stock awards, performance units and performance awards, in addition to the shares from the previous plan, the 1992 Plan. Since inception of the LTIP, non-qualified stock options and restricted stock awards have been granted with a five year vesting schedule. Under the LTIP, the exercise price of shares granted may not be less than 100% of the fair market value at the date of the grant.
On May 24, 2016, our stockholders adopted the 2016 Long-Term Incentive Plan (as amended, “2016 Plan”) which provides for approximately 8.9 million shares, comprised of 3.4 million new shares provided for under the 2016 Plan, approximately 0.4 million shares that were available for issuance under the previous LTIP that are now authorized for issuance under the 2016 Plan, approximately 2.6 million shares that were approved by the stockholders on May 15, 2018, and an additional 2.5 million shares that were approved by the stockholders on May 12, 2020.
Under the 2016 Plan, shares can be granted in the form of stock options, stock appreciation rights, restricted stock awards, performance awards, dividend equivalent rights, and other awards. Under the 2016 Plan, the exercise price of shares granted may not be less than 100% of the fair market value at the date of the grant. The 2016 Plan is
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administered by the Compensation Committee of the Board of Directors or such other committee of the Board of Directors as is designated by the Board of Directors (the “Committee”). Membership on the Committee is limited to independent directors. The Committee may delegate certain duties to one or more officers of the Company as provided in the 2016 Plan. The Committee determines the persons to whom awards are to be made, determines the type, size and terms of awards, interprets the 2016 Plan, establishes and revises rules and regulations relating to the 2016 Plan and makes any other determinations that it believes necessary for the administration of the 2016 Plan.
Options
The following weighted average assumptions were used to determine the fair value of the stock options granted on the original grant date for expense recognition purposes for options granted during December 31, 2021, 2020, and 2019 using a Black Scholes-Merton Model:

| 2021 |  | 2020 |  | 2019
Directors and SLT 1: |  |  |  |  |
Expected dividend yield | $ | 0.38 |  |  | $ | 0.33 |  |  | $ | 0.32 |
Expected volatility | 35.78 | % |  | 31.63 | % |  | 29.54 | %
Risk-free interest rate | 0.51 | % |  | 0.64 | % |  | 2.40 | %
Expected life (in years) | 4.00 |  | 5.00 |  | 5.00
Employees: |  |  |  |  |
Expected dividend yield | $ | 0.38 |  |  | $ | 0.32 |  |  | $ | 0.32 |
Expected volatility | 38.67 | % |  | 31.39 | % |  | 29.54 | %
Risk-free interest rate | 0.32 | % |  | 0.67 | % |  | 2.38 | %
Expected life (in years) | 3.00 |  | 5.00 |  | 5.00
1 Senior Leadership Team ("SLT") consists of officers and key members of management.

The expected term of the options is based on evaluations of historical and expected future employee exercise behavior. The risk-free interest rate is based on the U.S. Treasury rates at the date of grant with maturity dates approximately equal to the expected life at the grant date. Volatility is based on historical volatility of our stock over time periods equal to the expected life at grant date.
The following is a summary of stock options vested and exercisable as of December 31, 2021:

|  |  |  | Weighted Average |  | Weighted |  |
Range of |  | Number |  | Remaining |  | Average |  |
Exercise |  | of |  | Contractual |  | Exercise |  | Intrinsic
Prices |  | Shares |  | Life |  | Price |  | Value
|  |  |  |  |  |  |  | (in thousands)
$8.17 - 40.87 |  | 538,335 |  |  | 4.84 |  | $ | 30.32 |  |  | $ | 26,440 |
$41.37 - 41.37 |  | 361,231 |  |  | 6.37 |  | 41.37 |  |  | 13,748 |
$42.42 - 79.81 |  | 124,098 |  |  | 8.17 |  | 45.60 |  |  | 4,198 |
Total |  | 1,023,664 |  |  | 5.79 |  | $ | 36.07 |  |  | $ | 44,386 |

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The following is a summary of stock options vested and exercisable as of December 31, 2020:

|  |  |  | Weighted Average |  | Weighted |  |
Range of |  | Number |  | Remaining |  | Average |  |
Exercise |  | of |  | Contractual |  | Exercise |  | Intrinsic
Prices |  | Shares |  | Life |  | Price |  | Value
|  |  |  |  |  |  |  | (in thousands)
$7.18 - 36.95 |  | 543,646 |  |  | 5.33 |  | $ | 28.33 |  |  | $ | 20,820 |
$37.00 - 40.87 |  | 1,978 |  |  | 7.09 |  | 38.50 |  |  | 56 |
$41.37 - 66.98 |  | 194,697 |  |  | 7.87 |  | 41.59 |  |  | 4,875 |
Total |  | 740,321 |  |  | 6.00 |  | $ | 31.85 |  |  | $ | 25,751 |

The following is a summary of stock options vested and exercisable as of December 31, 2019:

|  |  |  | Weighted Average |  | Weighted |  |
Range of |  | Number |  | Remaining |  | Average |  |
Exercise |  | of |  | Contractual |  | Exercise |  | Intrinsic
Prices |  | Shares |  | Life |  | Price |  | Value
|  |  |  |  |  |  |  | (in thousands)
$7.18 - 34.10 |  | 451,077 |  |  | 5.44 |  | $ | 23.47 |  |  | $ | 11,702 |
$34.15 - 40.87 |  | 86,122 |  |  | 7.82 |  | 36.33 |  |  | 1,126 |
$41.37 - 50.68 |  | 1,750 |  |  | 1.81 |  | 41.59 |  |  | 14 |
Total |  | 538,949 |  |  | 5.81 |  | $ | 21.58 |  |  | $ | 12,842 |

A summary of option activity under the plans is as follows:

|  |  | Weighted Average Exercise
Options | Shares |  | Price
Outstanding at December 31, 2020 | 3,752,945 |  |  | $ | 39.00 |
Granted | 368,501 |  |  | 72.95 |
Exercised | (595,057) |  |  | 35.54 |
Forfeited or Expired | (160,920) |  |  | 48.44 |
Outstanding at December 31, 2021 | 3,365,469 |  |  | $ | 42.88 |
Exercisable at December 31, 2021 | 1,023,664 |  |  | $ | 36.07 |

The total pre-tax compensation cost related to unvested stock options not yet recognized as of December 31, 2021 is $17.2 million and is expected to be recognized over a weighted-average period of 2.25 years.
The total intrinsic value of options exercised during the years ended December 31, 2021, 2020, and 2019 was $22.6 million, $15.5 million, and $8.1 million, respectively. The cash received from options exercised during the year ended December 31, 2021, 2020, and 2019 was $21.1 million, $21.4 million, and $12.6 million, respectively. The impact of these cash receipts is included in financing activities in the accompanying consolidated statements of cash flows.
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Restricted Stock
The fair value of restricted stock awards is based on the fair market value of AAON common stock on the respective grant dates, reduced for the present value of dividends.
A summary of the unvested restricted stock awards is as follows:

|  |  | Weighted Average Grant date
Restricted stock | Shares |  | Fair Value
Unvested at December 31, 2020 | 224,691 |  |  | $ | 38.22 |
Granted | 36,234 |  |  | 69.46 |
Vested | (91,923) |  |  | 35.80 |
Forfeited | (7,777) |  |  | 49.27 |
Unvested at December 31, 2021 | 161,225 |  |  | $ | 46.08 |

At December 31, 2021, unrecognized compensation cost related to unvested restricted stock awards was approximately $4.3 million which is expected to be recognized over a weighted average period of 2.05 years.
PSUs
The Company has awarded performance stock units ("PSUs") to certain officers and employees under our 2016 Plan. Unlike our restricted stock awards, the PSUs are not considered legally outstanding and do not accrue dividends during the vesting period. The PSUs vest based on the level of achievement with respect to the Company's three year total shareholder return ("TSR") benchmarked against similar companies included in the capital goods sector of the S&P SmallCap 600 Index. The TSR measurement period is the three years ending December 31, 2023. At the end of the measurement period, each award will be converted into common stock at 0% to 200% of the PSUs held, depending on overall TSR as compared to the S&P SmallCap 600 Index benchmark companies.
The total pre-tax compensation cost related to unvested PSUs not yet recognized as of December 31, 2021 is $1.0 million and is expected to be recognized over a weighted average period of approximately 1.9 years.
The following weighted average assumptions were used to determine the fair value of the PSUs granted on the original grant date for expense recognition purposes for PSUs granted during the year ended December 31, 2021 using a Monte Carlo Model:

| Year Ended
| December 31, 2021
Expected dividend rate | $ | 0.38 |
Expected volatility | 39.10 | %
Risk-free interest rate | 0.28 | %
Expected life (in years) | 2.80

The expected term of the PSUs is based on the remaining service period ending December 31, 2023. The risk-free interest rate is based on the U.S. Treasury rates at the date of grant with maturity dates approximately equal to the expected life at the grant date. Volatility is based on historical volatility of our stock over time periods equal to the expected life at grant date.
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A summary of the unvested PSUs is as follows:

| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2020 | — |  |  | $ | — |
Granted | 18,483 |  |  | 87.78 |
Vested | — |  |  | — |
Forfeited | (1,632) |  |  | 87.78 |
Unvested at December 31, 2021 | 16,851 |  |  | $ | 87.78 |

Key Employee Awards
Subject to the MIPA Agreement (Note 4), the Company granted awards to key employees of BasX ("Key Employee Awards"). Unlike our restricted stock awards under the 2016 Plan, the Key Employee Awards are not considered legally outstanding and do not accrue dividends during the vesting period. The potential future issuance of the Key Employee Awards is contingent upon BasX meeting certain post-closing earn-out milestones during each of the years ending 2021, 2022, and 2023 as defined by the MIPA Agreement and continued employment with the Company. At the end of the earn-out period, ending December 31, 2023, each eligible Key Employee Award will vest and be converted into common stock. The fair value of Key Employee Awards is based on the fair market value of AAON common stock on the grant date.
The total pre-tax compensation cost related to unvested Key Employee Awards not yet recognized as of December 31, 2021 is $1.5 million and is expected to be recognized over a weighted average period of approximately 2.0 years.
A summary of the unvested Key Employee Awards is as follows:

| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2020 | — |  |  | $ | — |
Granted | 26,599 |  |  | 80.18 |
Vested | — |  |  | — |
Forfeited | — |  |  | — |
Unvested at December 31, 2021 | 26,599 |  |  | $ | 80.18 |

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Summary of Share-based Compensation
A summary of share-based compensation is as follows for the years ended December 31, 2021, 2020, and 2019:

| 2021 |  | 2020 |  | 2019
Grant date fair value of awards during the period: | (in thousands)
Options | $ | 7,010 |  |  | $ | 12,615 |  |  | $ | 20,442 |
Restricted stock | 2,517 |  |  | 3,316 |  |  | 4,631 |
PSUs | 1,622 |  |  | — |  |  | — |
Key employee awards | 1,572 |  |  | — |  |  | — |
Total | $ | 12,721 |  |  | $ | 15,931 |  |  | $ | 25,073 |

| 2021 |  | 2020 |  | 2019
Share-based compensation expense: | (in thousands)
Options | $ | 8,724 |  |  | $ | 8,312 |  |  | $ | 9,145 |
Restricted stock | 2,519 |  |  | 3,030 |  |  | 2,654 |
PSUs | 525 |  |  | — |  |  | — |
Key employee awards | 44 |  |  | — |  |  | — |
Total | $ | 11,812 |  |  | $ | 11,342 |  |  | $ | 11,799 |

| 2021 |  | 2020 |  | 2019
Income tax benefit related to share-based compensation: | (in thousands)
Options | $ | 4,571 |  |  | $ | 2,698 |  |  | $ | 1,197 |
Restricted stock | 837 |  |  | 519 |  |  | 575 |
Total | $ | 5,408 |  |  | $ | 3,217 |  |  | $ | 1,772 |

16. Employee Benefits
Defined Contribution Plan - 401(k)
We sponsor a defined contribution plan (the “Plan”). Eligible employees may make contributions in accordance with the Plan and IRS guidelines. In addition to the traditional 401(k), eligible employees are given the option of making an after-tax contribution to a Roth 401(k) or a combination of both. The Plan provides for automatic enrollment and for an automatic increase to the deferral percentage at January 1st of each year and each year thereafter. Eligible employees are automatically enrolled in the Plan at a 6% deferral rate and currently contributing employees deferral rates will be increased to 6% unless their current rate is above 6% or the employee elects to decline the automatic enrollment or increase. Administrative expenses are paid for by Plan participants. The Company paid no administrative expenses for the years ended 2021, 2020, and 2019.
The Company matches 175% up to 6% of employee contributions of eligible compensation. Additionally, Plan participant forfeitures are used to reduce the cost of the Company contributions.

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Contributions, net of forfeitures, made to the defined contribution plan | $ | 9,724 |  |  | $ | 9,091 |  |  | $ | 7,034 |

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Profit Sharing Bonus Plan
We maintain a discretionary profit sharing bonus plan under which approximately 10% of pre-tax profit from consolidated AAON Oklahoma and AAON Texas is paid to eligible employees on a quarterly basis in order to reward employee productivity. Eligible employees are regular full-time employees of AAON Oklahoma or AAON Texas who are actively employed and working on the first and last days of the calendar quarter and who were employed full-time for at least three full months prior to the beginning of the calendar quarter, excluding the Company's senior leadership team.

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Profit sharing bonus plan expense | $ | 8,526 |  |  | $ | 11,593 |  |  | $ | 7,448 |

Employee Medical Plan
We self-insure for our employees' health insurance. Eligible employees are regular full-time employees who are actively employed and working. Participants are expected to pay a portion of the premium costs for coverage of the benefits provided under the Plan. We estimate our self-insurance liabilities using an analysis provided by our claims administrator and our historical claims experience. In addition, the Company matches 175% of a participating employee's allowed contributions to a qualified health saving account to assist employees with our heath insurance plan deductibles.

| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Medical claim payments | $ | 9,640 |  |  | $ | 9,060 |  |  | $ | 5,898 |
Health saving account payments | 3,482 |  |  | 3,476 |  |  | 3,265 |

17. Stockholders’ Equity
Stock Repurchase
The Board has authorized three stock repurchase programs for the Company. The Company may purchase shares on the open market from time to time, up to a total of 5.7 million shares. The Board must authorize the timing and amount of these purchases and all repurchases are in accordance with the rules and regulations of the SEC allowing the Company to repurchase shares from the open market.
Our open market repurchase programs are as follows:

Agreement Execution Date |  | Authorized Repurchase $ |  | Expiration Date
May 16, 2018 1 |  | $15 million |  | March 1, 2019
March 5, 2019 1 |  | $20 million |  | March 4, 2020
March 13, 2020 |  | $20 million |  | ** 2
1 The 2018 and 2019 purchase authorizations were executed under 10b5-1 programs.
2 Expiration Date is at Board's discretion. The Company is authorized to effectuate repurchases of the Company's common stock on terms and conditions approved in advance by the Board.

The Company also has a stock repurchase arrangement by which employee-participants in our 401(k) savings and investment plan are entitled to have shares of AAON, Inc. stock in their accounts sold to the Company. The maximum number of shares to be repurchased is contingent upon the number of shares sold by employee-participants.
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Lastly, the Company repurchases shares of AAON, Inc. stock from certain of its directors and employees for payment of statutory tax withholdings on stock transactions. All other repurchases from directors or employees are contingent upon Board approval. All repurchases are done at current market prices.
Our repurchase activity is as follows:

|  | 2021 |  | 2020 |  | 2019
|  | (in thousands, except share and per share data)
Program |  | Shares | Total $ | $ per share |  | Shares | Total $ | $ per share |  | Shares | Total $ | $ per share
Open market |  | — |  | $ | — |  | $ | — |  |  | 103,689 |  | $ | 4,987 |  | $ | 48.10 |  |  | 5,799 |  | $ | 200 |  | $ | 34.46 |
401(k) |  | 297,772 |  | 20,876 |  | 70.11 |  |  | 438,921 |  | 25,073 |  | 57.12 |  |  | 419,963 |  | 19,386 |  | 46.16 |
Directors & employees |  | 22,526 |  | 1,590 |  | 70.59 |  |  | 23,272 |  | 1,169 |  | 50.23 |  |  | 28,668 |  | 1,207 |  | 42.11 |
Total |  | 320,298 |  | $ | 22,466 |  | $ | 70.14 |  |  | 565,882 |  | $ | 31,229 |  | $ | 55.19 |  |  | 454,430 |  | $ | 20,793 |  | $ | 45.76 |

|  | Inception to Date
|  | (in thousands, except share and per share data)
Program |  | Shares | Total $ | $ per share
Open market |  | 4,205,255 |  | $ | 74,793 |  | $ | 17.79 |
401(k) |  | 8,204,432 |  | 165,876 |  | 20.22 |
Directors & employees |  | 2,027,727 |  | 22,341 |  | 11.02 |
Total |  | 14,437,414 |  | $ | 263,010 |  | $ | 18.22 |

Subsequent to December 31, 2021 and through February 23, 2022, the Company repurchased 5,120 shares for $0.4 million from employees for payment of statutory tax withholdings on stock transactions and 37,923 shares for $2.4 million from our 401(k) savings and investment plan.
Dividends
At the discretion of the Board of Directors, we pay semi-annual cash dividends. Board approval is required to determine the date of declaration and amount for each semi-annual dividend payment.
Our recent dividends are as follows:

Declaration Date | Record Date | Payment Date | Dividend per Share
May 20, 2019 | June 3, 2019 | July 1, 2019 | $0.16
November 6, 2019 | November 27, 2019 | December 18, 2019 | $0.16
May 15, 2020 | June 3, 2020 | July 1, 2020 | $0.19
November 10, 2020 | November 27, 2020 | December 18, 2020 | $0.19
May 17, 2021 | June 3, 2021 | July 1, 2021 | $0.19
November 9, 2021 | November 26, 2021 | December 17, 2021 | $0.19

We paid cash dividends of $19.9 million, $19.8 million, and $16.6 million in 2021, 2020, and 2019, respectively.
Contingent Shares Issued in BasX Acquisition
On December 10, 2021, we closed on the acquisition of BasX (Note 4). Under the MIPA Agreement, we committed to $78.0 million in the aggregate of contingent consideration to the former owners of BasX, which is payable in approximately 1,037,000 shares of the Company's stock, par value $0.004 per share. The shares do not accrue dividends.
Under the MIPA Agreement, the potential future issuance of the shares is contingent upon BasX meeting certain post-closing earn-out milestones during each of the years ended 2021, 2022, and 2023. We estimated the fair value of contingent consideration related to these shares to be approximately $66.0 million, which is included in additional paid-in capital on the consolidated balance sheets. As of February 28, 2022, the Company has not issued any shares related to the contingent consideration to the former owners of BasX.
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18. New Markets Tax Credit
On October 24, 2019, the Company entered into a transaction with a subsidiary of an unrelated third-party financial institution (the “Investor”) and a certified Community Development Entity under a qualified New Markets Tax Credit (“NMTC”) program pursuant to Section 45D of the Internal Revenue Code of 1986, as amended, related to an investment in plant and equipment to facilitate the expansion of our Longview, Texas manufacturing operations (the “Project”). In connection with the NMTC transaction, the Company received a $23.0 million NMTC allocation for the Project and secured low interest financing and the potential for future debt forgiveness related to the Project.
Upon closing of the NMTC transaction, the Company provided an aggregate of approximately $15.9 million to the Investor, in the form of a loan receivable, with a term of twenty-five years, bearing an interest rate of 1.0%. This $15.9 million in proceeds plus capital contributed from the Investor was used to make an aggregate $22.5 million loan to a subsidiary of the Company. This financing arrangement is secured by equipment at the Company's Longview, Texas facilities and a guarantee from the Company, including an unconditional guarantee of NMTCs.
This transaction also includes a put/call feature that either of which can be exercised at the end of the seven-year compliance period. The Investor may exercise its put option or the Company can exercise the call, both of which could serve to trigger forgiveness of a portion of the debt. The value attributable to the put/call is nominal. The Investor's interest of $6.3 million is recorded in New market tax credit obligation on the consolidated balance sheets. The Company incurred approximately $0.3 million of debt issuance costs related to the above transactions, which are being amortized over the life of the transaction.
The Investor is subject to 100 percent recapture of the NMTC it receives for a period of seven years, as provided in the Internal Revenue Code and applicable U.S. Treasury regulations in the event that the financing facility of the Borrower under the transaction (AAON Coil Products, Inc.) becomes ineligible for NMTC treatment per the Internal Revenue Code requirements. The Company is required to be in compliance with various regulations and contractual provisions that apply to the NMTC arrangement. Noncompliance with applicable requirements could result in the Investor’s projected tax benefits not being realized and, therefore, require the Company to indemnify the Investor for any loss or recapture of the NMTC related to the financing until such time as the recapture provisions have expired under the applicable statute of limitations. The Company does not anticipate any credit recapture will be required in connection with this financing arrangement.
The Investor and its majority owned community development entity are considered VIEs and the Company is the primary beneficiary of the VIEs. This conclusion was reached based on the following:
•the ongoing activities of the VIEs, collecting and remitting interest and fees and NMTC compliance, were all considered in the initial design and are not expected to significantly affect performance throughout the life of the VIE;
•contractual arrangements obligate the Company to comply with NMTC rules and regulations and provide various other guarantees to the Investor and community development entity;
•the Investor lacks a material interest in the underling economics of the project; and
•the Company is obligated to absorb losses of the VIEs.
Because the Company is the primary beneficiary of the VIEs, they have been included in the consolidated financial statements. There are no other assets, liabilities or transaction in these VIEs outside of the financing transactions executed as part of the NMTC arrangement.
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19. Commitments and Contingencies
We are subject to various claims and legal actions that arise in the ordinary course of business. We closely monitor these claims and legal actions and frequently consult with our legal counsel to determine whether they may, when resolved, have a material adverse effect on our financial position, results of operations or cash flows and we accrue and/or disclose loss contingencies as appropriate. We have concluded that the likelihood is remote that the ultimate resolution of any pending litigation or claims will be material or have a material adverse effect on the Company’s business, financial position, results of operations, or cash flows.
We are occasionally party to short-term, cancellable and occasionally non-cancellable, fixed price contracts with major suppliers for the purchase of raw material and component parts. We expect to receive delivery of raw materials for use in our manufacturing operations. These contracts are not accounted for as derivative instruments because they meet the normal purchase and normal sales exemption. We had no material contractual purchase obligations as of December 31, 2021.
20. New Accounting Pronouncements
Changes to U.S. GAAP are established by the FASB in the form of accounting standards updates (“ASUs”) to the FASB’s Accounting Standards Codification.
We consider the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial statements and notes thereto.
In October 2021, the FASB issued ASU No. 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers which requires contract assets and contract liabilities acquired in a business combination to be recognized and measured by the acquirer on the acquisition date in accordance with ASC 606, Revenue from Contracts with Customers. Generally, this new guidance will result in the acquirer recognizing contract assets and contract liabilities at the same amounts recorded by the acquiree. Historically, such amounts were recognized by the acquirer at fair value in acquisition accounting. The guidance should be applied prospectively to acquisitions occurring on or after the effective date. The guidance is effective for years beginning after December 15, 2022, including interim periods within those years. Early adoption is permitted, including in interim periods, for any financial statements that have not yet been issued. We adopted this standard at the beginning of the fourth quarter of 2021. Upon adoption, this update did not have a material effect on our consolidated financial position or result of operations.
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21. Earnings Per Share
Basic net income per share is calculated by dividing net income by the weighted average number of shares of common stock outstanding during the period. Diluted net income per share assumes the conversion of all potentially dilutive securities and is calculated by dividing net income by the sum of the weighted average number of shares of common stock outstanding plus all potentially dilutive securities. Dilutive common shares consist primarily of stock options and restricted stock awards.
Dilutive shares related to the contingent consideration payable to former owners of BasX (Note 4) are included in the calculation of diluted weighted average shares once it is determinable that BasX will satisfy the post-closing earn-out milestones under the terms of the MIPA agreement. The shares will be included in basic weighted average share once they are legally issued and no longer contingent.
The following table sets forth the computation of basic and diluted earnings per share:

| 2021 |  | 2020 |  | 2019
Numerator: | (in thousands, except share and per share data)
Net income | $ | 58,758 |  |  | $ | 79,009 |  |  | $ | 53,711 |
Denominator: |  |  |  |  |
Basic weighted average shares | 52,404,199 |  |  | 52,168,679 |  |  | 52,079,865 |
Effect of dilutive shares related to stock based compensation 1 | 1,301,698 |  |  | 892,490 |  |  | 555,550 |
Effect of dilutive shares related contingent consideration 2 | 23,092 |  |  | — |  |  | — |
Diluted weighted average shares | 53,728,989 |  |  | 53,061,169 |  |  | 52,635,415 |
Earnings per share: |  |  |  |  |
Basic | $ | 1.12 |  |  | $ | 1.51 |  |  | $ | 1.03 |
Dilutive | $ | 1.09 |  |  | $ | 1.49 |  |  | $ | 1.02 |
Anti-dilutive shares: |  |  |  |  |
Shares | 304,029 |  |  | 364,787 |  |  | 1,868,087 |
1 Dilutive shares related to stock options, restricted stock, PSUs and Key Employee Awards (Note 17)
2 Dilutive shares related contingent shares issued to former owners of BasX (Note 4)

22. Related Parties
The Company purchases some supplies from an entity controlled by the Company’s Executive Chairman. The Company sometimes makes sales to the Executive Chairman and CEO/President. Additionally, the Company sells units to an entity owned by a member of the CEO/President's immediate family. This entity is also one of the Company’s Representatives and as such, the Company makes payments to the entity for Third Party Products. Through the acquisition of BasX (Note 4), at December 31, 2021, the Company leased an office in Redmond, Oregon from an entity in which certain members of management have an ownership interest.
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Following is a summary of transactions and balances with affiliates:

|  | Years Ended December 31,
|  | 2021 | 2020 | 2019
|  | (in thousands)
Sales to affiliates |  | $ | 3,752 |  | $ | 3,475 |  | $ | 886 |
Payments to affiliates |  | 185 |  | 256 |  | 332 |
|  |  | December 31,
|  |  | 2021 | 2020
|  |  | (in thousands)
Due from affiliates |  |  | $ | 547 |  | $ | 342 |

23. Segments
ASC 280, Segment Reporting, establishes the standards for reporting information about segments in financial statements. In applying the criteria set forth in ASC 280, the Company has determined that it has three reportable segments for financial reporting purposes. Management evaluates the performance of its business segments primarily on gross profit.
Beginning in the fourth quarter of 2021, due to the acquisition of BasX and internal leadership reporting changes, the Company reevaluated its reportable segments for disclosure purposes. The Company has conformed its segment reporting accordingly and has reclassified comparative prior period information to reflect this change. The Company's chief decision maker ("CODM"), our CEO, allocates resources and assesses the performance of each operating segment using information about the operating segment's net sales and income from operations. The CODM does not evaluate operating segments using asset or liability information.
AAON Oklahoma: AAON Oklahoma designs, manufactures, sells and services standard, semi-custom and custom HVAC systems, designs and produces controls solutions for all of our HVAC units and sells retail parts to customers through our two retail part stores. Through the NAIC research and development laboratory facility, AAON Oklahoma is able test units units under various environmental conditions. AAON Oklahoma includes the operations of both our Tulsa, Oklahoma and Parkville, Missouri facilities, our NAIC research and development laboratory facility and two retail parts locations.
AAON Coil Products: AAON Coil Products designs and manufactures a selection of our standard, semi-custom and custom HVAC systems. In addition, AAON Coil Products designs and manufactures various heating and cooling coils to be used in HVAC systems, mostly for the benefit of AAON Oklahoma and AAON Coil Products. AAON Coil Products consists of operations at our Longview, Texas facilities.
BasX: BasX provides product development design and manufacturing of custom engineered air handling systems including high efficiency data center cooling solutions, cleanroom solutions, HVAC systems and modular solutions. BasX consists of operations at our Redmond, Oregon facility.
The following table summarizes certain financial data related to our segments. Transactions between segments are recorded based on prices negotiated between the segments. The “Other and eliminations” category in the Total Assets table below includes assets at our non-operating entity AAON, Inc., Nevada corporation, that are not allocated to the reportable segments, as well as intercompany eliminations.
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| Years Ended December 31, |
| 2021 |  | 2020 |  | 2019 |
| (in thousands) |
Net Sales |  |  |  |  |  |
AAON Oklahoma |  |  |  |  |  |
External sales | $ | 463,845 |  |  | $ | 458,957 |  |  | $ | 418,669 |  |
Inter-segment sales | 2,504 |  |  | 2,683 |  |  | 2,261 |  |
AAON Coil Products |  |  |  |  |  |
External sales | 66,589 |  |  | 55,594 |  |  | 50,664 |  |
Inter-segment sales | 24,250 |  |  | 21,552 |  |  | 25,792 |  |
BasX 1 | 4,083 |  |  | — |  |  | — |  |
Eliminations | (26,754) |  |  | (24,235) |  |  | (28,053) |  |
Net sales | $ | 534,517 |  |  | $ | 514,551 |  |  | $ | 469,333 |  |
Gross Profit |  |  |  |  |  |
AAON Oklahoma | $ | 126,868 |  |  | $ | 140,099 |  |  | $ | 107,228 |  |
AAON Coil Products | 10,075 |  |  | 15,750 |  |  | 12,197 |  |
BasX 1 | 887 |  |  | — |  |  | — |  |
Gross profit | $ | 137,830 |  |  | $ | 155,849 |  |  | $ | 119,425 |  |

| December 31, |
| 2021 |  | 2020 |
| (in thousands) |
Long-lived assets |  |  |  |
AAON Oklahoma | $ | 183,840 |  |  | $ | 170,603 |  |
AAON Coil Products | 62,534 |  |  | 54,308 |  |
BasX 1 | 28,662 |  |  | — |  |
Total long-lived assets | $ | 275,036 |  |  | $ | 224,911 |  |
Intangible assets and goodwill |  |  |  |
AAON Oklahoma | $ | 3,229 |  |  | $ | 3,267 |  |
AAON Coil Products | — |  |  | — |  |
BasX 1 | 152,619 |  |  | — |  |
Total intangible assets and goodwill | $ | 155,848 |  |  | $ | 3,267 |  |
1 BasX was acquired on December 10, 2021. We have included the results of BasX's operations in our consolidated financial statements beginning December 11, 2021.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.
Not Applicable.
Item 9A. Controls and Procedures.
(a) Evaluation of Disclosure Controls and Procedures
Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of December 31, 2021.
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Based upon the evaluation, our principal executive and principal financial officers have concluded that our disclosure controls and procedures were effective at December 31, 2021 to ensure the information required to be disclosed by us in reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our principal executive and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure and is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC.
(b) Management’s Annual Report on Internal Control over Financial Reporting
Our management is responsible for establishing and maintaining adequate internal control over our financial reporting as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act. Our internal control over financial reporting is a process designed by, or under the supervision of, our principal executive and principal financial officers, and effected by our board of directors, management and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. GAAP.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
On December 10, 2021, we acquired BasX, LLC ("BasX"). Management acknowledges that it is responsible for establishing and maintaining a system of internal controls over financial reporting for BasX. We are in the process of integrating BasX, and we therefore have excluded BasX from our December 31, 2021 assessment of the effectiveness of internal control over financial reporting. BasX had total assets of $205.6 million as of December 31, 2021 and third party revenues of $4.1 million from December 11, 2021 to December 31, 2021, which are included in our consolidated financial statements as of and for the year ended December 31, 2021. The impact of the acquisition of BasX has not materially affected and is not expected to materially affect our internal control over financial reporting. As a result of these integration activities, certain controls are being evaluated and may be changed. We believe, however, that we will be able to maintain sufficient controls over the substantive results of our financial reporting throughout this integration process.
In making our assessment of internal control over financial reporting, management has used the criteria issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”) in the 2013 Internal Control—Integrated Framework. Based on our assessment, our management concluded that the Company maintained effective internal control over financial reporting as of December 31, 2021.
The effectiveness of the Company’s internal control over financial reporting as of December 31, 2021 has been audited by Grant Thornton LLP, our independent registered public accounting firm, as stated in their report which is included in this Item 9A of this report on Form 10-K.
(c) Changes in Internal Control over Financial Reporting
There have been no changes in internal control over financial reporting that occurred during the fourth quarter of 2021 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.
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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
Board of Directors and Stockholders
AAON, Inc.
Opinion on internal control over financial reporting
We have audited the internal control over financial reporting of AAON, Inc. (a Nevada corporation) and subsidiaries (the “Company”) as of December 31, 2021, based on criteria established in the 2013 Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2021, based on criteria established in the 2013 Internal Control—Integrated Framework issued by COSO.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the consolidated financial statements of the Company as of and for the year ended December 31, 2021, and our report dated February 28, 2022 expressed an unqualified opinion on those financial statements.
Basis for opinion
The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting (“Management’s Report”). Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.
Our audit of, and opinion on, the Company’s internal control over financial reporting does not include the internal control over financial reporting of BasX, Inc., a wholly-owned subsidiary, whose financial statements reflect total assets and revenues constituting 32 and 1 percent, respectively, of the related consolidated financial statement amounts as of and for the year ended December 31, 2021. As indicated in Management’s Report, BasX, Inc. (formerly BasX, LLC) was acquired during 2021. Management’s assertion on the effectiveness of the Company’s internal control over financial reporting excluded internal control over financial reporting of BasX, Inc.
Definition and limitations of internal control over financial reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
/s/ GRANT THORNTON LLP
Tulsa, Oklahoma
February 28, 2022
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Item 9B. Other Information.
None.
PART III
Item 10. Directors, Executive Officers and Corporate Governance.
The information required by Items 401, 405, 406 and 407(c)(3), (d)(4) and (d)(5) of Regulation S-K is incorporated by reference to the information contained in our definitive Proxy Statement to be filed with the Securities and Exchange Commission in connection with our annual meeting of stockholders scheduled to be held on May 12, 2022.
Code of Ethics
We adopted a code of ethics that applies to our principal executive officer, principal financial officer, and principal accounting officer or persons performing similar functions, as well as other employees and directors. Our code of ethics can be found on our website at www.aaon.com. We will also provide any person without charge, upon request, a copy of such code of ethics. Requests may be directed to AAON, Inc., 2425 South Yukon Avenue, Tulsa, Oklahoma 74107, attention Rebecca A. Thompson, or by calling (918) 382-6216.
Item 11. Executive Compensation.
The information required by Items 402 and 407(e)(4) and (e)(5) of Regulation S-K is incorporated by reference to the information contained in our definitive Proxy Statement to be filed with the Securities and Exchange Commission in connection with our annual meeting of stockholders scheduled to be held on May 12, 2022.
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.
The information required by Item 403 and Item 201(d) of Regulation S-K is incorporated by reference to the information contained in our definitive Proxy Statement to be filed with the Securities and Exchange Commission in connection with our annual meeting of stockholders scheduled to be held May 12, 2022.
Item 13. Certain Relationships and Related Transactions, and Director Independence.
The information required to be reported pursuant to Item 404 of Regulation S-K and paragraph (a) of Item 407 of Regulation S-K is incorporated by reference in our definitive proxy statement relating to our annual meeting of stockholders scheduled to be held May 12, 2022.
Our Code of Conduct guides the Board of Directors in its actions and deliberations with respect to related party transactions. Under the Code, conflicts of interest, including any involving the directors or any Named Officers, are prohibited except under any guidelines approved by the Board of Directors. Only the Board of Directors may waive a provision of the Code of Conduct for a director or a Named Officer, and only then in compliance with all applicable laws, rules and regulations. We have not entered into any new material related party transactions and have no preexisting material related party transactions in 2021, 2020, or 2019.
Item 14. Principal Accountant Fees and Services.
This information is incorporated by reference in our definitive Proxy Statement to be filed with the Securities and Exchange Commission in connection with our annual meeting of stockholders scheduled to be held May 12, 2022.
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PART IV

Item 15. | Exhibits and Financial Statement Schedules.

(a) |  | Financial statements. |
|  | (1) |  | The consolidated financial statements and the report of independent registered public accounting firm are included in Item 8 of this Form 10-K. |
|  | (2) |  | The consolidated financial statements other than those listed at item (a)(1) above have been omitted because they are not required under the related instructions or are not applicable. |
|  | (3) |  | The exhibits listed at item (b) below are filed as part of, or incorporated by reference into, this Form 10-K. |
(b) |  | Exhibits: |  |  |
|  | (3) |  | (A) |  | Amended and Restated Articles of Incorporation (ii) |
|  |  |  | (B) |  | Amended and Restated Bylaws (i) |
|  | (4) |  |  |  | Amended and Restated Loan Agreement (dated November 24, 2021) and related documents (iii) |
|  | (4.16) |  |  |  | Description of Securities |
|  | (10.1) |  |  |  | AAON, Inc. 1992 Stock Option Plan, as amended (v) |
|  | (10.2) |  |  |  | AAON, Inc. 2007 Long-Term Incentive Plan, as amended (vi) |
|  | (10.3) |  |  |  | AAON, Inc. 2016 Long-Term Incentive Plan (iv) |
|  | (21) |  |  |  | List of Subsidiaries |
|  | (23) |  |  |  | Consent of Grant Thornton LLP |
|  | (31.1) |  |  |  | Certification of CEO |
|  | (31.2) |  |  |  | Certification of CFO |
|  | (32.1) |  |  |  | Section 1350 Certification – CEO |
|  | (32.2) |  |  |  | Section 1350 Certification – CFO |
|  | (99.1) |  |  |  | Membership Interest Purchase Agreement - Acquisition of BasX, LCC (dated November 18, 2021) |
|  | (101) |  | (INS) |  | Inline XBRL Instance Document |
|  | (101) |  | (SCH) |  | Inline XBRL Taxonomy Extension Schema |
|  | (101) |  | (CAL) |  | Inline XBRL Taxonomy Extension Calculation Linkbase |
|  | (101) |  | (DEF) |  | Inline XBRL Taxonomy Extension Definition Linkbase |
|  | (101) |  | (LAB) |  | Inline XBRL Taxonomy Extension Label Linkbase |
|  | (101) |  | (PRE) |  | Inline XBRL Taxonomy Extension Presentation Linkbase |
|  | (104) |  |  |  | Cover Page Interactive Data File (embedded within the Inline XBRL Document and included in Exhibit 101) |
|  | (i) |  |  |  | Incorporated herein by reference to the exhibits to our Form 8-K dated May 15, 2020. |
|  | (ii) |  |  |  | Incorporated herein by reference to exhibits to our Annual Report on Form 10-K for the fiscal year ended December 31, 2014. |
|  | (iii) |  |  |  | Incorporated herein by reference to exhibit to our Form 8-K dated November 24, 2021. |
|  | (iv) |  |  |  | Incorporated herein by reference to our Form S-8 Registration Statement No. 333-212863 dated August 2, 2016, our Form S-8 Registration Statement No. 333-226512 dated August 2, 2018, and our Form S-8 Registration Statement No. 333-241538 dated August 6, 2020. |

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|  | (v) |  |  |  | Incorporated by reference to exhibits to our Annual Report on Form 10-K for the fiscal year ended December 31, 1991, and to our Form S-8 Registration Statement No. 333-52824. |
|  | (vi) |  |  |  | Incorporated herein by reference to our Form S-8 Registration Statement No. 333-151915, Form S-8 Registration Statement No. 333-207737. |

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SIGNATURES
Pursuant to the requirement of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

|  | AAON, INC.
Dated: | February 28, 2022 | By: | /s/ Gary D. Fields
|  |  | Gary D. Fields, Chief Executive Officer

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Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

Dated: | February 28, 2022 | /s/ Gary D. Fields
|  | Gary D. Fields Chief Executive Officer, President, and Director (principal executive officer)
Dated: | February 28, 2022 | /s/ Rebecca A. Thompson
|  | Rebecca A. Thompson Chief Financial Officer (principal financial officer)
Dated: | February 28, 2022 | /s/ Christopher D. Eason
|  | Christopher D. Eason Chief Accounting Officer (principal accounting officer)
Dated: | February 28, 2022 | /s/ Norman H. Asbjornson
|  | Norman H. Asbjornson Executive Chairman and Director
Dated: | February 28, 2022 | /s/ Angela E. Kouplen
|  | Angela E. Kouplen Director
Dated: | February 28, 2022 | /s/ Paul K. Lackey, Jr.
|  | Paul K. Lackey, Jr. Director
Dated: | February 28, 2022 | /s/ Caron A. Lawhorn
|  | Caron A. Lawhorn Director
Dated: | February 28, 2022 | /s/ Stephen O. LeClair
|  | Stephen O. LeClair Director
Dated: | February 28, 2022 | /s/ A.H. McElroy II
|  | A.H. McElroy II Director
Dated: | February 28, 2022 | /s/ David R. Stewart
|  | David R. Stewart Director
Dated: | February 28, 2022 | /s/ Bruce Ware
|  | Bruce Ware Director
Dated: | February 28, 2022 | /s/ Luke A. Bomer
|  | Luke A. Bomer Secretary

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