10-K 1 mrtn20151231_10k.htm FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 0R 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 20 15

Commission file number 0-15010

MARTEN TRANSPORT, LTD.

(Exact name of registrant as specified in its charter)

DELAWARE |  | 39-1140809
(State of incorporation) |  | (I.R.S. Employer Identification no.)
129 MARTEN STREET |  |
MONDOVI, WISCONSIN | 54755 | (715) 926-4216
(Address of principal executive offices) | (Zip Code) | (Registrant’s telephone number)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class: | Name of each exchange on which registered:
COMMON STOCK, PAR VALUE $.01 PER SHARE | THE NASDAQ STOCK MARKET LLC
| (NASDAQ GLOBAL SELECT MARKET)

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 Exchange 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 (Section 232.405 of this chapter) 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 if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ☒

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. Large accelerated filer ☐ Accelerated filer ☒ Non-accelerated filer (do not check if a smaller reporting company) ☐ Smaller reporting company ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Exchange Act Rule 12b-2). YES ☐ NO ☒

As of June 30, 2015 (the last business day of the Registrant’s most recently completed second fiscal quarter), the aggregate market value of the Common Stock of the Registrant (based upon the closing price of the Common Stock at that date as reported by the NASDAQ Global Select Market), excluding outstanding shares beneficially owned by directors and executive officers, was $566,530,000.

As of February 29, 2016, 32,390,025 shares of Common Stock of the Registrant were outstanding.

Part III of this Annual Report on Form 10-K incorporates by reference information (to the extent specific sections are referred to in this Report) from the Registrant’s Proxy Statement for the annual meeting to be held May 10, 2016, or 2015 Proxy Statement.

TABLE OF CONTENTS

|  | Page
PART I
ITEM 1. | BUSINESS | 1
ITEM 1A. | RISK FACTORS | 7
ITEM IB. | UNRESOLVED STAFF COMMENTS | 12
ITEM 2 | PROPERTIES | 12
ITEM 3 | LEGAL PROCEEDINGS | 12
ITEM 4. | MINE SAFETY DISCLOSURES | 12
ITEM 4A. | EXECUTIVE OFFICERS OF THE REGISTRANT | 13
PART II
ITEM 5. | MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES | 14
ITEM 6. | SELECTED FINANCIAL DATA | 17
ITEM 7. | MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS | 18
ITEM 7A. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK | 35
ITEM 8. | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA | 36
ITEM 9. | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE | 60
ITEM 9A. | CONTROLS AND PROCEDURES | 60
ITEM 9B. | OTHER INFORMATION | 60
PART III
ITEM 10. | DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE | 61
ITEM 11. | EXECUTIVE COMPENSATION | 62
ITEM 12. | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS | 62
ITEM 13. | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE | 62
ITEM 14. | PRINCIPAL ACCOUNTANT FEES AND SERVICES | 62
PART IV
ITEM 15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES | 63
OTHER
Signature Page | 65
Exhibit Index | 67

FORWARD-LOOKING INFORMATION

This Annual Report on Form 10-K contains certain forward-looking statements. Such statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Any statements not of historical fact may be considered forward-looking statements. Writ ten words such as “may” “expect,” “believe,” “anticipate,” “plan,” “goal,” or “estimate,” or other variations of these or similar words, identify such statements. These statements by their nature involve substantial risks and uncertainties, and actual results may differ materially from those expressed in such forward-looking statements. Important factors known to us that could cause such material differences are identified in this Annual Report on Form 10-K under the heading “Risk Factors” beginning on page 7. We undertake no obligation to correct or update any forward-looking statements, whether as a result of new information, future events, or otherwise. You are advised, however, to consult any future disclosures we make on related subjects in future filings with the Securities and Exchange Commission.

References in this Annual Report to “we,” “us,” “our,” or the “Company” or similar terms refer to Marten Transport, Ltd. and its consolidated subsidiaries unless the context otherwise requires.

PART I

ITEM 1. BUSINESS

Overview

We are one of the leading temperature-sensitive truckload carriers in the United States. We specialize in transporting and distributing food and other consumer packaged goods that require a temperature-controlled or insulated environment. In 2015, we generated $665.0 million in operating revenue, which consists of revenue from our Truckload, Dedicated, Intermodal and Brokerage operations. Approximately 69% of our Truckload and Dedicated revenue resulted from hauling temperature-sensitive products and 31% from hauling dry freight. We operate throughout the United States and in parts of Canada and Mexico, with substantially all of our revenue generated from within the United States. We provide regional truckload carrier services in the Southeast, West Coast, Midwest, South Central and Northeast regions. Our primary medium-to-long-haul traffic lanes are between the Midwest and the West Coast, Southwest, Southeast, and the East Coast, as well as from California to the Pacific Northwest. In 2015, our average length of haul was 547 miles.

Our growth strategy is to expand our business organically by offering shippers a high level of service and significant freight capacity. We market primarily to shippers that offer consistent volumes of freight in the lanes we prefer and are willing to compensate us for a high level of service. With our fleet of 2,740 company and independent contractor tractors, we are able to offer service levels that include up to 99% on-time performance and delivery within the narrow time windows often required when shipping perishable commodities.

We have four reporting segments – Truckload, Dedicated, Intermodal and Brokerage. Financial information regarding these segments can be found in Footnote 17 to the Notes to Consolidated Financial Statements under Item 8 of this Form 10-K.

The primary source of our operating revenue is provided by our Truckload segment through a combination of regional short-haul and medium-to-long-haul full-load transportation services. We transport food and other consumer packaged goods that require a temperature-controlled or insulated environment across the United States and into and out of Mexico and Canada.

Our Dedicated segment provides customized transportation solutions tailored to meet individual customers’ requirements, utilizing temperature-controlled trailers, dry vans and other specialized equipment within the United States. Our customer contracts range from three to five years and are subject to annual rate reviews.

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Our Intermodal segment transports our customers’ freight within the United States primarily utilizing our temperature-controlled trailers and also, previously, our dry containers on railroad flatcars for portions of trips, with the balance of the trips using our tractors or, to a lesser extent, contracted carriers. In March 2015, we disposed of the overhead-intensive dry containers that were used in a portion of our intermodal operations.

Our Brokerage segment arranges for smaller third-party carriers to transport freight for our customers in temperature-controlled trailers and dry vans within the United States and into and out of Mexico while we retain the billing, collection and customer management responsibilities. Our Brokerage segment also included the revenue of MW Logistics, LLC, or MWL, a third-party provider of logistics services to the transportation industry, until we deconsolidated our 45% interest in MWL effective March 28, 2013.

Organized under Wisconsin law in 1970, we are a successor to a sole proprietorship Roger R. Marten founded in 1946. In 1988, we reincorporated under Delaware law. Our executive offices are located at 129 Marten Street, Mondovi, Wisconsin 54755. Our telephone number is (715) 926-4216.

We maintain a website at www.marten.com. We are not including the information contained on our website as a part of, nor incorporating it by reference into, this Annual Report on Form 10-K. We post on our website, free of charge, documents that we file with or furnish to the Securities and Exchange Commission, including our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and proxy statements, as soon as reasonably practicable after we electronically file such material with, or furnish such material to, the Securities and Exchange Commission. We also provide a link on our website to Forms 3, 4 and 5 that our officers, directors and 10% stockholders file with the Securities and Exchange Commission pursuant to Section 16(a) of the Securities Exchange Act of 1934.

Marketing and Operations

We approach our business as an integrated effort of marketing and operations. Our emphasis in marketing is directed to the temperature-sensitive market, which is generally service-sensitive, as opposed to being solely price competitive. We target food and consumer packaged goods companies whose products require temperature-sensitive services and who ship multiple truckloads per week. By emphasizing high-quality service, we seek to become a core carrier for our customers. In 2015, our largest customer was Wal-Mart.

Our marketing efforts are conducted by a staff of 210 sales, customer service and support personnel under the supervision of our senior management team. Marketing personnel travel within their regions to solicit new customers and maintain contact with existing customers. Customer service managers regularly contact customers to solicit additional business on a load-by-load basis.

Our operations and sales personnel strive to improve our asset productivity by seeking freight that allows for rapid turnaround times, minimizes non-revenue miles between loads, and carries a favorable rate structure. Once we have established a customer relationship, customer service managers work closely with our fleet managers to match customer needs with our capacity and the location of revenue equipment. Fleet managers use our optimization system to assign loads to satisfy customer and operational requirements, as well as to meet the routing needs of our drivers. We attempt to route most of our trucks over selected operating lanes, which we believe assists us in meeting customer requirements, balancing traffic, reducing non-revenue miles, and improving the reliability of delivery schedules.

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We employ technology in our operations when we believe that it will allow us to operate more efficiently and the investment is cost-justified. Examples of the technologies we employ include:

| ● | Terrestrial- and satellite-based tracking and messaging that allows us to communicate with our drivers, obtain load position updates, provide our customers with freight visibility, and download operating information such as fuel mileage and idling time for the tractor engines and temperature setting and run time for the temperature-control units on our trailers.

| ● | Freight optimization software that assists us in selecting loads that match our overall criteria, including profitability, repositioning, identifying capacity for expedited loads, driver availability and home time, and other factors.

| ● | Electronic data interchange and internet communication with customers concerning freight tendering, invoices, shipment status, and other information.

| ● | Electronic logging devices in our tractors to monitor drivers’ hours of service.

| ● | Auxiliary power units installed on our company-owned tractors that allow us to decrease fuel costs associated with idling our tractors.

| ● | Fuel-routing software that optimizes the fuel stops for each trip to take advantage of volume discounts available in our fuel network.

We believe this integrated approach to our marketing and operations, coupled with our use of technology, has allowed us to provide our customers with a high level of service and support our revenue growth in an efficient manner. For example, we had a non-revenue mile percentage of 7.5% during 2015, which points to the efficiency of our operations and we believe compares favorably to other temperature-sensitive and dry van trucking companies.

Major Customers

A significant portion of our revenue is generated from our major customers. In 2015, our top 30 customers accounted for approximately 59% of our revenue, and our top ten customers accounted for 38% of our revenue. We have emphasized increasing our customer diversity which is shown by the decrease in the portion of our revenue with our top customers. In 2010, our top 30 customers accounted for approximately 78% of our revenue, and our top ten customers accounted for 52% of our revenue. Each of our top ten customers has been a significant customer of ours for the last ten years. We believe our relationships with these key customers are sound, but we are dependent upon them and the loss of some or all of their business could have a materially adverse effect on our results.

Drivers and Other Personnel

We believe that maintaining a safe and productive professional driver group is essential to providing excellent customer service and achieving profitability. As of December 31, 2015, 135 of our drivers have driven more than one million miles for us without a preventable accident, while 40 of our drivers have driven more than two million miles and 11 have driven more than three million miles for us without a preventable accident.

We select drivers, including independent contractors, using our specific guidelines for safety records, including drivers’ Compliance, Safety, Accountability, or CSA, scores, driving experience, and personal evaluations. We maintain stringent screening, training, and testing procedures for our drivers to reduce the potential for accidents and the corresponding costs of insurance and claims. We train new drivers at a number of our terminals in all phases of our policies and operations, as well as in safety techniques and fuel-efficient operation of the equipment. All new drivers also must pass DOT required tests prior to assignment to a vehicle.

We primarily pay company-employed drivers a fixed rate per mile. The rate increases based on length of service. We also compensate drivers after one hour of detention, for inclement weather and for road service delays. Drivers also are eligible for bonuses based upon safe, efficient driving. We pay independent contractors a fixed rate per mile. Independent contractors pay for their own fuel, insurance, maintenance, and repairs.

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Competition in the trucking industry for qualified drivers is normally intense and is expected to increase. Our operations have been impacted, and from time-to-time we have experienced under-utilization and increased expense, as a result of a shortage of qualified drivers. We place a high priority on the recruitment and retention of an adequate supply of qualified drivers.

As of December 31, 2015, we had 3,577 employees. This total consists of 2,716 drivers, 312 mechanics and maintenance personnel, and 549 support personnel, which includes management and administration. As of that date, we also contracted with 65 independent contractors. None of our employees are represented by a collective bargaining unit. We consider relations with our employees to be good.

Revenue Equipment

Our revenue equipment programs are an important part of our overall goal of profitable growth. We evaluate our equipment decisions based on factors such as initial cost, useful life, warranty terms, expected maintenance costs, fuel economy, driver comfort, customer needs, manufacturer support, and resale value. We generally operate newer, well-maintained equipment with uniform specifications to minimize our spare parts inventory, streamline our maintenance program, and simplify driver training.

As of December 31, 2015, we operated a fleet of 2,740 tractors, including 2,675 company-owned tractors and 65 tractors supplied by independent contractors. The average age of our company-owned tractor fleet at December 31, 2015 was approximately 1.5 years. In 2015, we replaced our company-owned tractors within an average of 4.1 years after purchase.

Peterbilt and Freightliner manufacture most of our company-owned tractors. Maintaining a relatively new and standardized fleet allows us to operate most miles while the tractors are under warranty to minimize repair and maintenance costs. It also enhances our ability to attract drivers, increases fuel economy, and improves customer acceptance by minimizing service interruptions caused by breakdowns. We adhere to a comprehensive maintenance program during the life of our equipment. We perform most routine servicing and repairs at our terminal facilities to reduce costly on-road repairs and out-of-route trips. We do not have any agreements with tractor manufacturers pursuant to which they agree to repurchase the tractors or guarantee a residual value, and we therefore could incur losses upon disposition if resale values of used tractors decline.

The EPA adopted revised emissions control regulations, which required progressive reductions in exhaust emissions from diesel engines through 2010, for engines manufactured in October 2002 and thereafter. The revised regulations decrease the amount of emissions that can be released by tractor engines and affect tractors produced after the effective date of the regulations. The last of three stepped reductions in exhaust emissions was effective for engines manufactured in January 2010 and thereafter. As of December 31, 2015, 2,664 tractors, representing over 99% of the company-owned tractors in our fleet, have tractor engines which were manufactured in January 2010 or thereafter and, therefore, were required to meet the revised design requirements. Compliance with these regulations has increased the cost of new tractors as manufacturers have significantly increased new equipment prices, in part to meet the more stringent engine design requirements imposed by the EPA.

We historically have contracted with independent contractors to provide and operate a portion of our tractor fleet. Independent contractors own their own tractors and are responsible for all associated expenses, including financing costs, fuel, maintenance, insurance, and taxes. The percentage of our fleet provided by independent contractors was 2.4% as of December 31, 2015 compared to 2.1% as of December 31, 2014 and 2.2% as of December 31, 2013.

As of December 31, 2015, we operated a fleet of 4,700 trailers, consisting of 3,977 refrigerated trailers and 723 dry trailers. Most of our trailers are equipped with Thermo-King refrigeration units, air ride suspensions, and anti-lock brakes. The average age of our trailer fleet at December 31, 2015 was approximately 2.6 years. In 2015, we replaced our company-owned trailers within an average of 5.1 years after purchase.

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Insurance and Claims

We self-insure for a portion of our claims exposure resulting from workers’ compensation, auto liability, general liability, cargo and property damage claims, as well as employees’ health insurance. We are responsible for our proportionate share of the legal expenses relating to such claims as well. We reserve currently for anticipated losses and expenses. We periodically evaluate and adjust our insurance and claims reserves to reflect our experience. We have $10.4 million in standby letters of credit to guarantee settlement of claims under agreements with our insurance carriers and regulatory authorities. We maintain insurance coverage for per-incident and total losses in excess of the amounts for which we self-insure up to specified policy limits with licensed insurance carriers. Insurance carriers have raised premiums for many businesses, including trucking companies. As a result, our insurance and claims expense could increase, or we could raise our self-insured retention when our policies are renewed. We believe that our policy of self-insuring up to set limits, together with our safety and loss prevention programs, are effective means of managing insurance costs.

Fuel

Our operations are heavily dependent upon the use of diesel fuel. The price and availability of diesel fuel can vary and are subject to political, economic, and market factors that are beyond our control. Fuel prices fluctuated dramatically and quickly at various times during the last three years. We actively manage our fuel costs by purchasing fuel in bulk in Mondovi, Wisconsin and at a number of our other maintenance facilities throughout the country and have volume purchasing arrangements with national fuel centers that allow our drivers to purchase fuel at a discount while in transit. During 2015, over 99% of our fuel purchases were made at these designated locations. To help further reduce fuel consumption, we have equipped our company-owned tractors with auxiliary power units since 2007. These units reduce fuel consumption by providing quiet climate control and electrical power for our drivers without idling the tractor engine. We have also invested in satellite tracking equipment for the temperature-control units on our trailers that has improved fuel usage through management of required temperature settings and run time of the units.

We further manage our exposure to changes in fuel prices through fuel surcharge programs with our customers and other measures that we have implemented. We have historically been able to pass through a significant portion of long-term increases in fuel prices and related taxes to customers in the form of fuel surcharges. These fuel surcharges, which adjust with the cost of fuel, enable us to recover a substantial portion of the higher cost of fuel as prices increase, except for non-revenue miles, out-of-route miles or fuel used while the tractor is idling. As of December 31, 2015, we had no derivative financial instruments to reduce our exposure to fuel price fluctuations.

Competition

We are one of the leading carriers operating in the temperature-sensitive segment of the truckload market. This market is highly competitive and fragmented. We compete with many other truckload carriers that provide temperature-sensitive service of varying sizes and, to a lesser extent, with less-than-truckload carriers, railroads, and other transportation companies, many of which have more equipment, a wider range of services, and greater capital resources than we do or have other competitive advantages. In particular, several of the largest truckload carriers that offer primarily dry-van service also offer temperature-sensitive service, and these carriers could attempt to increase their business in the temperature-sensitive market. We also compete with other motor carriers for the services of drivers, independent contractors, and management employees. We believe that the principal competitive factors in our business are service, freight rates, capacity, use of technology and financial stability. As one of the largest and best-capitalized carriers focused on the temperature-sensitive segment, we believe we are well positioned to compete in that segment.

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Regulation

The United States Department of Transportation, or DOT, and various state and local agencies exercise broad powers over our business, generally governing such activities as authorization to engage in motor carrier operations, safety and insurance requirements. Our company drivers and independent contractors also must comply with the safety and fitness regulations promulgated by the DOT, including those relating to drug and alcohol testing and hours-of-service.

The DOT, through the Federal Motor Carrier Safety Administration, or FMCSA, imposes safety and fitness regulations on us and our drivers. In December 2010, the FMCSA introduced the Compliance, Safety, Accountability, or CSA, system to measure and evaluate the on-road safety performance of commercial carriers and individual drivers. CSA’s Motor Carrier Safety Measurement System replaced the former SafeStat system and has removed a number of drivers from the industry as carriers are less willing to hire and retain drivers with marginal ratings, which has increased competition for qualified drivers. The FMCSA issued in January 2016 a proposed Safety Fitness Determination rule that would replace the current system utilizing CSA scores. The proposed methodology would integrate on-road safety data from inspections with the results of carrier investigations and accident reports. A final rule is expected in 2016 or 2017.

The FMCSA issued a regulatory rule effective in July 2013 that revised the hours-of-service requirements for drivers, which designate the length of time that drivers are allowed to drive and work. The rule retained the 11-hour driving maximum under which the industry has been operating since 2004. However, changes to the “34-hour restart” provision and required breaks effectively reduced the maximum workweek for drivers. These changes reduced on-duty non-driving time and moderately decreased industry productivity. Omnibus bills adopted in December 2014 and December 2015 have suspended the additional restrictions effective in July 2013 to the “34-hour restart” provision. The restart rules are required by law to remain suspended until a comprehensive study on the impact of the rules is presented to Congress, who will determine any policy changes based on their review. This review is expected to take place in 2016.

In January 2011, the FMCSA issued a regulatory proposal that would require commercial carriers to track compliance with hours-of-service regulations using electronic logging devices, or ELD’s, which was vacated and sent back to the FMCSA for further analysis and review in September 2011 by the 7th U.S. Circuit Court of Appeals. The Moving Ahead for Progress in the 21st Century Act, or MAP-21 Act, included a provision directing the FMCSA to develop a final ELD rule in 2013, which was delayed until its issuance in December 2015. The final rule requires compliance beginning in December 2017. Our entire tractor fleet has been equipped with ELD’s since early 2011.

The EPA adopted revised emissions control regulations, which required progressive reductions in exhaust emissions from diesel engines through 2010, for engines manufactured in October 2002 and thereafter. The revised regulations decrease the amount of emissions that can be released by tractor engines and affect tractors produced after the effective date of the regulations. The last of three stepped reductions in exhaust emissions was effective for engines manufactured in January 2010 and thereafter. As of December 31, 2015, 2,664 tractors, representing over 99% of the company-owned tractors in our fleet, have tractor engines which were manufactured in January 2010 or thereafter and, therefore, were required to meet the revised design requirements. Compliance with these regulations has increased the cost of new tractors as manufacturers have significantly increased new equipment prices, in part to meet the more stringent engine design requirements imposed by the EPA.

We are also subject to various environmental laws and regulations dealing with the handling of hazardous materials, fuel storage tanks, air emissions from our facilities, engine idling, and discharge and retention of storm water. These regulations did not have a significant impact on our operations or financial results in 2013 through 2015.

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ITEM 1A. RISK FACTORS

The following factors are important and should be considered carefully in connection with any evaluation of our business, financial condition, results of operations, prospects, or an investment in our common stock. The risks and uncertainties described below are those that we currently believe may materially affect our company or our financial results. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also impair our business operations or affect our financial results.

Our business is subject to general economic and business factors that are largely beyond our control, any of which could have a materially adverse effect on our operating results. Our business is dependent on a number of general economic and business factors that may have a materially adverse effect on our results of operations, many of which are beyond our control. These factors include excess capacity in the trucking industry, strikes or other work stoppages, and significant increases or fluctuations in interest rates, fuel taxes, fuel prices, and license and registration fees. We are affected by recessionary economic cycles and downturns in customers’ business cycles, particularly in market segments and industries where we have a significant concentration of customers. Economic conditions may adversely affect our customers and their ability to pay for our services.

It is not possible to predict the effects of actual or threatened armed conflicts or terrorist attacks, efforts to combat terrorism, military action against any foreign state, heightened security requirements, or other related events and the subsequent effects on the economy or on consumer confidence in the United States, or the impact, if any, on our future results of operations.

I nstability of the credit markets and the resulting effects on the economy could have a material adverse effect on our operating results. If the credit markets and the economy weaken, our business, financial results, and results of operations could be materially and adversely affected, especially if consumer confidence declines and domestic spending decreases. We may need to incur additional indebtedness, which may include drawing on our credit facility, or issue debt securities in the future to fund working capital requirements, make investments, or for general corporate purposes. Additionally, stresses in the credit market causes uncertainty in the equity markets, which may result in volatility of the market price for our securities.

We operate in a highly competitive and fragmented industry, and numerous competitive factors could impair our ability to maintain our current profitability. We compete with many other truckload carriers that provide temperature-sensitive service of varying sizes and, to a lesser extent, with less-than-truckload carriers, railroads and other transportation companies, many of which have more equipment, a wider range of services and greater capital resources than we do or have other competitive advantages. In particular, several of the largest truckload carriers that offer primarily dry-van service also offer temperature-sensitive service, and these carriers could attempt to increase their business in the temperature-sensitive market. Many of our competitors periodically reduce their freight rates to gain business, especially during times of reduced growth rates in the economy, which may limit our ability to maintain or increase freight rates or maintain significant growth in our business. In addition, many customers reduce the number of carriers they use by selecting so-called “core carriers” as approved service providers, or conduct bids from multiple carriers for their shipping needs, and in some instances we may not be selected as a core carrier or to provide service under such bids.

In addition, the trend toward consolidation in the trucking industry may create other large carriers with greater financial resources and other competitive advantages relating to their size. Competition from freight logistics and brokerage companies may negatively impact our customer relationships and freight rates. Furthermore, economies of scale that may be passed on to smaller carriers by procurement aggregation providers may improve such carriers’ ability to compete with us.

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If the growth in our region al operations declines, or if we expand into a market with insufficient econ omic activity, our results of operations could be adversely affected. We operate regional service centers which are located in a number of cities within the United States. In order to support future growth, these regional operations require the commitment of additional capital, revenue equipment and facilities along with qualified management, drivers and other personnel. Should the growth in our regional operations decline, the results of our operations could be adversely affected. It may become more difficult to identify additional cities that can support service centers, and we may expand into cities where there is insufficient economic activity, reduced capacity for growth or less driver and non-driver personnel to support our operations. We may encounter operating conditions in these new markets that materially differ from our current operations and customer relationships may be difficult to obtain at appropriate freight rates. Also, we may not be able to apply our regional operating strategy successfully in additional cities, and it might take longer than expected or require a more substantial financial commitment than anticipated to establish our operations in the additional cities.

Increased prices and restricted availability of new revenue equipment could cause our financial condition, results of operations and cash flows to suffer. We have experienced higher prices for new tractors and trailers over the past few years, primarily as a result of higher commodity prices and government regulations applicable to newly manufactured tractors and diesel engines. We expect to continue to pay increased prices for revenue equipment for the foreseeable future. Our business could be harmed if we are unable to continue to obtain an adequate supply of new tractors and trailers or if we have to pay increased prices for new revenue equipment.

The EPA adopted revised emissions control regulations, which required progressive reductions in exhaust emissions from diesel engines through 2010, for engines manufactured in October 2002 and thereafter. The revised regulations decrease the amount of emissions that can be released by tractor engines and affect tractors produced after the effective date of the regulations. The last of three stepped reductions in exhaust emissions was effective for engines manufactured in January 2010 and thereafter. As of December 31, 2015, 2,664 tractors, representing over 99% of the company-owned tractors in our fleet, have tractor engines which were manufactured in January 2010 or thereafter and, therefore, were required to meet the revised design requirements. Compliance with these regulations has increased the cost of new tractors as manufacturers have significantly increased new equipment prices, in part to meet the more stringent engine design requirements imposed by the EPA.

We have significant ongoing capital requirements that could harm our financial condition, results of operations and cash flows if we are unable to generate sufficient cash from our operations. The truckload industry is capital intensive, and our policy of operating newer equipment requires us to expend significant amounts annually. If we elect to expand our fleet in future periods, our capital needs would increase. We expect to pay for projected capital expenditures with cash flows from operations and borrowings under our revolving credit facility. If we are unable to generate sufficient cash from operations and obtain financing on favorable terms in the future, we may have to limit our growth, enter into less favorable financing arrangements, or operate our revenue equipment for longer periods, any of which could have a materially adverse effect on our profitability.

We derive a significant portion of our revenue from our major customers, the loss of one or more of which could have a materially adverse effect on our business. A significant portion of our revenue is generated from our major customers. For 2015, our top 30 customers, based on revenue, accounted for approximately 59% of our revenue; our top ten customers accounted for approximately 38% of our revenue; our top five customers accounted for approximately 28% of our revenue; and our top two customers accounted for approximately 18% of our revenue. Generally, other than for our Dedicated operations, we enter into one-year contracts with our major customers, the majority of which do not contain any firm obligations to ship with us. We cannot ensure that, upon expiration of existing contracts, these customers will continue to use our services or that, if they do, they will continue at the same levels. Many of our customers periodically solicit bids from multiple carriers for their shipping needs, and this process may depress freight rates or result in loss of business to our competitors. Some of our customers also operate their own private trucking fleets, and they may decide to transport more of their own freight. A reduction in or termination of our services by one or more of our major customers could have a materially adverse effect on our business and operating results.

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Ongoing insurance and claims expenses could significantly affect our earnings. Our future insurance and claims expense might exceed historical levels, which could reduce our earnings. We self-insure for a portion of our claims exposure resulting from workers’ compensation, auto liability, general liability, cargo and property damage claims, as well as employees’ health insurance. We also are responsible for our legal expenses relating to such claims. We reserve currently for anticipated losses and expenses. We periodically evaluate and adjust our claims reserves to reflect our experience. However, ultimate results may differ from our estimates, which could result in losses over our reserved amounts.

We maintain insurance above the amounts for which we self-insure with licensed insurance carriers. Although we believe the aggregate insurance limits should be sufficient to cover reasonably expected claims, it is possible that one or more claims could exceed our aggregate coverage limits. Insurance carriers have raised premiums for many businesses, including trucking companies. As a result, our insurance and claims expense could increase, or we could raise our self-insured retention when our policies are renewed. If these expenses increase, or if we experience a claim in excess of our coverage limits, or we experience a claim for which coverage is not provided, results of our operations and financial condition could be materially and adversely affected.

We operate in a highly regulated industry and increased costs of compliance with, or liability for violation of, existing or future regulations could have a materially adverse effect on our business. The DOT and various state and local agencies exercise broad powers over our business, generally governing such activities as authorization to engage in motor carrier operations, safety and insurance requirements. Our company drivers and independent contractors also must comply with the safety and fitness regulations promulgated by the DOT, including those relating to drug and alcohol testing and hours-of-service. We also may become subject to new or more restrictive regulations relating to fuel emissions, ergonomics, or other matters affecting safety or operating methods. Other agencies, such as the EPA and the Department of Homeland Security, or DHS, also regulate our equipment, operations, and drivers. Future laws and regulations may be more stringent and require changes in our operating practices, influence the demand for transportation services, or require us to incur significant additional costs. Higher costs incurred by us or by our suppliers who pass the costs onto us through higher prices could adversely affect our results of operations.

The DOT, through the Federal Motor Carrier Safety Administration, or FMCSA, imposes safety and fitness regulations on us and our drivers. In December 2010, the FMCSA introduced the Compliance, Safety, Accountability, or CSA, system to measure and evaluate the on-road safety performance of commercial carriers and individual drivers. CSA’s Motor Carrier Safety Measurement System replaced the former SafeStat system and has removed a number of drivers from the industry as carriers are less willing to hire and retain drivers with marginal ratings, which has increased competition for qualified drivers. The FMCSA issued in January 2016 a proposed Safety Fitness Determination rule that would replace the current system utilizing CSA scores. The proposed methodology would integrate on-road safety data from inspections with the results of carrier investigations and accident reports. A final rule is expected in 2016 or 2017.

The FMCSA issued a regulatory rule effective in July 2013 that revised the hours-of-service requirements for drivers, which designate the length of time that drivers are allowed to drive and work. The rule retained the 11-hour driving maximum under which the industry has been operating since 2004. However, changes to the “34-hour restart” provision and required breaks effectively reduced the maximum workweek for drivers. These changes reduced on-duty non-driving time and moderately decreased industry productivity. Omnibus bills adopted in December 2014 and December 2015 have suspended the additional restrictions effective in July 2013 to the “34-hour restart” provision. The restart rules are required by law to remain suspended until a comprehensive study on the impact of the rules is presented to Congress, who will determine any policy changes based on their review. This review is expected to take place in 2016.

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In January 2011, the FMCSA issued a regulatory proposal that would require commercial carriers to track compliance with hours-of-service regulations using electronic logging devices, or ELD’s, which was vacated and sent back to the FMCSA for further analysis and review in September 2011 by the 7th U.S. Circuit Court of Appeals. The Moving Ahead for Progress in the 21st Century Act, or MAP-21 Act, included a provision directing the FMCSA to develop a final ELD rule in 2013, which was delayed until its issuance in December 2015. The final rule requires compliance beginning in December 2017. Our entire tractor fleet has been equipped with ELD’s since early 2011.

From time to time, various federal, state, or local taxes are increased, including taxes on fuels. We cannot predict whether, or in what form, any such increase applicable to us will be enacted, but such an increase could adversely affect our profitability.

Increases in compensation or difficulty in attracting drivers could affect our profitability and ability to grow. The transportation industry has historically experienced substantial difficulty in attracting and retaining qualified drivers, including independent contractors. With increased competition for drivers, including the impact that regulatory changes mandated by CSA have on the number of drivers in the transportation industry, we could experience greater difficulty in attracting sufficient numbers of qualified drivers. In addition, the available pool of independent contractor drivers is smaller than it has been historically. Accordingly, we may face difficulty in attracting and retaining drivers for all of our current tractors and for those we may add. Additionally, we may face difficulty in increasing the number of our independent contractor drivers. In addition, our industry suffers from high turnover rates of drivers. Our turnover rate requires us to recruit a substantial number of drivers. Moreover, our turnover rate could increase. If we are unable to continue to attract drivers and contract with independent contractors, we could be required to continue adjusting our driver compensation package beyond the norm or let trucks sit idle. An increase in our expenses or in the number of tractors without drivers could materially and adversely affect our growth and profitability.

Fluctuations in the price or availability of fuel may increase our cost of operation, which could materially and adversely affect our profitability. We require large amounts of diesel fuel to operate our tractors and to power the temperature-control units on our trailers. Fuel is one of our largest operating expenses. Fuel prices tend to fluctuate, and prices and availability of all petroleum products are subject to political, economic and market factors that are beyond our control. We depend primarily on fuel surcharges, auxiliary power units for our tractors, satellite tracking equipment for the temperature-control units on our trailers, volume purchasing arrangements with truck stop chains and bulk purchases of fuel at our terminals to control and recover our fuel expenses. There can be no assurance that we will be able to collect fuel surcharges, enter into volume purchase agreements, or execute successful hedges in the future. Additionally, we may encounter decreases in productivity that may offset or eliminate savings from auxiliary power units or satellite tracking equipment, or may incur unexpected maintenance or other costs associated with such units. The absence of meaningful fuel price protection through these measures, fluctuations in fuel prices, or a shortage of diesel fuel, could materially and adversely affect our results of operations.

Seasonality and the impact of weather can affect our profitability. Our tractor productivity generally decreases during the winter season because inclement weather impedes operations and some shippers reduce their shipments. At the same time, operating expenses generally increase, with harsh weather creating higher accident frequency, increased claims and more equipment repairs. We can also suffer short-term impacts from weather-related events such as hurricanes, blizzards, ice-storms, and floods that could harm our results or make our results more volatile.

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Lack of capacity and service instability in the railroad industry could increase our operating costs and reduce our ability to offer intermodal services, which could adversely affect our revenue, results of operations, and customer relationships. Our Intermodal segment is dependent on railroad services and their capacity to transport freight for our customers. We expect our dependence on railroads will continue to increase as we expand our Intermodal services. We compete for the availability of railroad services with other intermodal operators as well as certain industries reliant on the use of rail cars, such as oil and agricultural, whose consumption of railroad capacity has significantly fluctuated over the past several years. In most markets, rail service is limited to a few railroads or even a single railroad. Any capacity constraints, service problems or reduction in service by the railroads with which we have, or in the future may have, relationships is likely to increase the cost of the rail-based services we provide and reduce the reliability, timeliness, and overall attractiveness of our rail-based services, which could adversely affect our revenue, results of operations and customer relationships. Furthermore, railroads are relatively free to adjust shipping rates up or down as market conditions permit. Price increases could result in higher costs to our customers and reduce or eliminate our ability to offer Intermodal services. In addition, we cannot assure you that we will be able to negotiate additional contracts with railroads to expand our capacity, add additional routes, or obtain multiple providers, which could limit our ability to provide this service.

Our operations are subject to various environmental laws and regulations, the violation of which could result in substantial fines or penalties. We are subject to various environmental laws and regulations dealing with the handling of hazardous materials, fuel storage tanks, air emissions from our vehicles and facilities, engine idling, and discharge and retention of storm water. We operate in industrial areas, where truck terminals and other industrial activities are located, and where groundwater or other forms of environmental contamination have occurred. Our operations involve the risks of fuel spillage or seepage, environmental damage, and hazardous waste disposal, among others. Although we have instituted programs to monitor and control environmental risks and promote compliance with applicable environmental laws and regulations, if we are involved in a spill or other accident involving hazardous substances or if we are found to be in violation of applicable laws or regulations, we could be subject to liabilities, including substantial fines or penalties or civil and criminal liability, any of which could have a materially adverse effect on our business and operating results.

If we are unable to retain our executive officers and key management employees, o ur business, financial condition and resul ts of operations could be adversely affected. We are highly dependent upon the services of our executive officers and key management employees, including our Chief Executive Officer. Currently, we do not have employment agreements with these employees and the loss of their services for any reason could have a materially adverse effect on our operations and future profitability. We have entered into agreements with our executive officers that require us to provide compensation to them in the event of termination of their employment without cause in connection with or within a certain period of time after a “change in control” of our Company. In addition, we must continue to develop and retain a core group of managers if we are to realize our goal of expanding our operations and continuing our growth. While our Board regularly engages in succession planning for our Chief Executive Officer and executive leadership team, there is no guarantee that a candidate or plan will be successful. Although we strive to reduce the potential negative impact of any such changes, the loss of any executive officers or key management employees could result in disruptions to our operations. In addition, hiring, training, and successfully integrating replacement personnel, whether internal or external, could be time consuming, may cause additional disruptions to our operations, and may be unsuccessful, which could negatively impact our business, financial condition and results of operations.

We depend on the stability, availability and security of the technology related to our management information and communication systems, which may prove to be inadequate. We depend upon our management information and communication systems for the efficient operation of our business. Our systems are used for receiving, planning and optimizing loads, communicating with and monitoring our drivers, tractors and trailers, billing customers and financial reporting. In addition, some of our key software has been developed internally by our programmers or by adapting purchased software to our needs and this software may not be easily modified or integrated with other software and systems. Although we have taken steps to prevent and mitigate service interruptions and data security threats, the operational and security risks associated with information technology systems have increased in recent years because of the complexity of the systems and the sophistication and amount of cyber attacks. Our business will be materially and adversely affected if our management information and communication systems are compromised or disrupted by a failure or security breach or if we are unable to improve, upgrade, integrate or expand our systems as we continue to execute our growth strategy.

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ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2. PROPERTIES

Our executive offices and principal terminal are located on approximately seven acres in Mondovi, Wisconsin. This facility consists of 39,000 square feet of office space and 21,000 square feet of equipment repair and maintenance space. We added additional equipment repair and maintenance facilities in 2007 and in 2009 in Mondovi, Wisconsin which consist of 15,000 square feet of space located on approximately 11 acres and 50,000 square feet of space located on approximately three acres, respectively. We operate facilities in or near the following cities at which we perform the following operating activities:

| Owned or |  |
Company Locations | Leased | Office | Maintenance
Mondovi, Wisconsin | Owned | X | X
Phoenix, Arizona | Owned | X | X
Jurupa Valley, California | Owned |  | X
Tampa, Florida | Owned | X | X
Atlanta, Georgia | Owned | X | X
Indianapolis, Indiana | Owned | X | X
Kansas City, Kansas | Owned | X | X
Portland, Oregon | Owned | X | X
Memphis, Tennessee | Owned | X | X
Desoto, Texas | Owned | X | X
Laredo, Texas | Owned | X | X
Colonial Heights, Virginia | Owned | X | X
Otay Mesa, California | Leased | X |
Carlisle, Pennsylvania | Leased | X | X

Our Truckload, Dedicated and Brokerage segments operate out of a majority of our facilities while our Intermodal segment operates out of a small number of our locations. We believe the nature, size and location of our properties are suitable and adequate for our current business needs.

ITEM 3. LEGAL PROCEEDINGS

We are involved in ordinary routine litigation incidental to our operations. These lawsuits primarily involve claims for workers’ compensation, personal injury, or property damage incurred in the transportation of freight.

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable.

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ITEM 4A. EXECUTIVE OFFICERS OF THE REGISTRANT

Our executive officers, with their ages and the offices held as of February 29, 2016, are as follows:

Name | Age | Position
Randolph L. Marten | 63 | Chairman of the Board, Chief Executive Officer and Director
Timothy M. Kohl | 68 | President
Timothy P. Nash | 64 | Executive Vice President of Sales and Marketing
James J. Hinnendael | 52 | Executive Vice President and Chief Financial Officer
John H. Turner | 54 | Senior Vice President of Sales

Randolph L. Marten has been a full-time employee of ours since 1974. Mr. Marten has been a Director since October 1980, our Chairman of the Board since August 1993 and our Chief Executive Officer since January 2005. Mr. Marten also served as our President from June 1986 until June 2008, our Chief Operating Officer from June 1986 until August 1998 and as a Vice President from October 1980 to June 1986.

Timothy M. Kohl has been our President since June 2008 and joined the company in November 2007. Mr. Kohl served as Knight Transportation Inc.’s President from 2004 to 2007 and as its Secretary from 2000 to 2007. Mr. Kohl served as a director on Knight’s Board of Directors from 2001 to 2006, and he served as its Chief Financial Officer from 2000 to 2004. Mr. Kohl also served as Knight’s Vice President of Human Resources from 1996 through 1999. From 1999 through 2000, Mr. Kohl served as Vice President of Knight’s southeast region. Prior to his employment with Knight, Mr. Kohl was employed by Burlington Motor Carriers as Vice President of Human Resources. Prior to his employment with Burlington Motor Carriers, Mr. Kohl served as Vice President of Human Resources for J.B. Hunt.

Timothy P. Nash has been our Executive Vice President of Sales and Marketing since November 2000. Mr. Nash also served as our Vice President of Sales from November 1990 to November 2000 and as a Regional Sales Manager from July 1987 to November 1990. Mr. Nash served as a regional sales manager for Overland Express, Inc., a long-haul truckload carrier, from 1986 to 1987.

James J. Hinnendael has been our Executive Vice President since May 2015 and our Chief Financial Officer since January 2006 and served as our Controller from January 1992 to December 2005. Mr. Hinnendael served in various professional capacities with Ernst & Young LLP, a public accounting firm, from 1987 to December 1991. Mr. Hinnendael is a certified public accountant.

John H. Turner has been our Senior Vice President of Sales since December 2013, our Vice President of Sales from January 2007 to December 2013 and an executive officer since August 2007. He also served as our Vice President of Sales from October 2000 to February 2005, and as an executive officer from January 2002 to February 2005. Mr. Turner also served as our Director of Sales from July 1999 to October 2000 and in various professional capacities in our sales and marketing area from August 1991 to July 1999 and as our Operations Manager-West from October 1990 to August 1991. Previously, Mr. Turner served as a vice president for Naterra Land, Inc., a recreational land developer, from 2005 to 2006 and as the western fleet general manager and area sales manager for Munson Transportation, Inc., a long-haul truckload carrier, from 1986 to 1990.

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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Our common stock is listed on the NASDAQ Global Select Market under the symbol “MRTN.” The table below shows the range of high and low bid prices for the quarters indicated on the NASDAQ Global Select Market. Such quotations reflect inter-dealer prices, without retail markups, markdowns or commissions and, therefore, may not necessarily represent actual transactions.

|  | Common Stock Price |
|  | High |  |  | Low |
Year ended December 31, 20 15 |  |  |  |  |  |
Fourth Quarter |  | $ | 18.54 |  |  | $ | 14.50 |
Third Quarter |  |  | 22.87 |  |  |  | 9.03 |
Second Quarter |  |  | 24.88 |  |  |  | 10.30 |
First Quarter |  |  | 23.77 |  |  |  | 16.52 |
Year ended December 31, 20 14 |  |  |  |  |  |  |  |
Fourth Quarter |  | $ | 22.48 |  |  | $ | 13.95 |
Third Quarter |  |  | 22.98 |  |  |  | 15.94 |
Second Quarter |  |  | 25.67 |  |  |  | 14.43 |
First Quarter |  |  | 21.86 |  |  |  | 15.40 |

The prices do not include adjustments for retail mark-ups, mark-downs or commissions. On February 29, 2016, we had 154 record stockholders, and approximately 8,876 beneficial stockholders of our common stock. On June 14, 2013, we effected a three-for-two stock split in the form of a 50% stock dividend. The foregoing stock prices and the following cash dividends and share amounts have been adjusted to give retroactive effect to the stock split for all periods presented.

Dividend Policy

In August 2010, we announced a regular cash dividend program to our stockholders, subject to approval each quarter. Quarterly cash dividends of $0.025 per share of common stock were declared in each quarter of 2015 and 2014 and totaled $3.3 million in each of 2015 and 2014. Quarterly cash dividends of $0.017 per share were declared in each of the first and second quarters of 2013, and of $0.025 per share were declared in each of the third and fourth quarters of 2013, totaling $2.8 million. We currently expect to continue to pay quarterly cash dividends in the future. The payment of cash dividends in the future, and the amount of any such dividends, will depend upon our financial condition, results of operations, cash requirements, and certain corporate law requirements, as well as other factors deemed relevant by our Board of Directors. Our ability to pay cash dividends is currently limited by restrictions contained in our revolving credit facility, which prohibits us from paying, in any fiscal year, stock redemptions and dividends in excess of 25% of our net income from the prior fiscal year. A waiver of the 25% limitation for 2015 and 2016, should it apply, was obtained from the lender.

Share Repurchase Program

In December 2007, our Board of Directors approved and we announced a share repurchase program to repurchase up to one million shares of our common stock either through purchases on the open market or through private transactions and in accordance with Rule 10b-18 of the Exchange Act. On November 4, 2015, our Board of Directors approved and we announced an increase in the share repurchase program, providing for the repurchase of up to $40 million, or approximately 2 million shares, of our common stock. The timing and extent to which we repurchase shares depends on market conditions and other corporate considerations. The repurchase program does not have an expiration date.

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In the fourth quarter of 2015, we repurchased and retired 941,024 shares of our common stock for $16.2 million.

The following table shows our share repurchase activity during the three months ended December 31, 2015:

Period |  | Total Number of Shares Purchased |  |  | Average Price Paid per Share |  |  | Total Number of Shares Purchased as Part of a Publicly Announced Program |  |  | Maximum Dollar Amount of Shares that may yet be Purchased Under the Program (in thousands) |
October 1, 2015- October 31, 2015 |  |  | 69,000 |  |  | $ | 16.28 |  |  |  | 69,000 |  |  | $ | 38,067 |
November 1, 2015- November 30, 2015 |  |  | 634,727 |  |  |  | 17.28 |  |  |  | 634,727 |  |  |  | 27,101 |
December 1, 2015- December 31, 2015 |  |  | 237,297 |  |  |  | 17.22 |  |  |  | 237,297 |  |  |  | 23,015 |
Total |  |  | 941,024 |  |  | $ | 17.19 |  |  |  | 941,024 |  |  | $ | 23,015 |

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Comparative Stock Performance

The graph below compares the cumulative total stockholder return on our common stock with the NASDAQ Market index and the SIC code 4213 (trucking, except local) line-of-business index for the last five years. Research Data Group, Inc. prepared the line-of-business index. The graph assumes $100 is invested in our common stock, the NASDAQ Stock Market index and the line-of-business index on December 31, 2010, with reinvestment of dividends. The comparisons in the graph below are based on historical data and are not intended to forecast the possible future performance of our common stock. The information in the graph below shall be deemed “furnished” and not “filed” for purposes of Section 18 of the Exchange Act or otherwise subject to the liabilities of that section.

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ITEM 6. SELECTED FINANCIAL DATA

The following selected financial data should be read in conjunction with the consolidated financial statements and notes under Item 8 of this Form 10-K.

(Dollars in thousands, except per share amounts) |  | 201 5 |  |  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
FOR THE YEAR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ | 664,994 |  |  | $ | 672,929 |  |  | $ | 659,214 |  |  | $ | 638,456 |  |  | $ | 603,679 |
Operating income |  |  | 61,063 |  |  |  | 51,006 |  |  |  | 51,995 |  |  |  | 45,853 |  |  |  | 43,030 |
Net income |  |  | 35,745 |  |  |  | 29,834 |  |  |  | 30,147 |  |  |  | 27,267 |  |  |  | 24,285 |
Operating ratio(1) |  |  | 90.8 | % |  |  | 92.4 | % |  |  | 92.1 | % |  |  | 92.8 | % |  |  | 92.9 | %
PER-SHARE DATA(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share |  | $ | 1.07 |  |  | $ | 0.89 |  |  | $ | 0.91 |  |  | $ | 0.82 |  |  | $ | 0.74 |
Diluted earnings per common share |  |  | 1.06 |  |  |  | 0.89 |  |  |  | 0.90 |  |  |  | 0.82 |  |  |  | 0.73 |
Dividends declared per common share |  |  | 0.10 |  |  |  | 0.10 |  |  |  | 0.083 |  |  |  | 0.563 |  |  |  | 0.053 |
Book value |  |  | 12.50 |  |  |  | 11.61 |  |  |  | 10.78 |  |  |  | 10.01 |  |  |  | 9.71 |
AT YEAR END |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets(3) |  | $ | 631,528 |  |  | $ | 576,461 |  |  | $ | 522,387 |  |  | $ | 487,468 |  |  | $ | 467,841 |
Long-term debt |  |  | 37,867 |  |  |  | 24,373 |  |  |  | — |  |  |  | 2,726 |  |  |  | — |
Stockholders’ equity |  |  | 409,421 |  |  |  | 387,926 |  |  |  | 359,137 |  |  |  | 331,923 |  |  |  | 320,359 |

(1) | Represents operating expenses as a percentage of operating revenue.

(2) | Restated to reflect the three-for-two stock split effected in the form of a 50% stock dividend on June 14, 2013.

(3) | The amounts for December 31, 2011 through 2014 have been restated to reflect the reclassification of current deferred income tax assets to be consistent with the current presentation upon adoption of Financial Accounting Standards Board Accounting Standards Update No. 2015-17, “Income Taxes” effective December 31, 2015.

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and results of operations should be read together with the selected consolidated financial data and our consolidated financial statements and the related notes appe aring elsewhere in this report. This discussion and analysis contains forward-looking statements that involve risks, uncertainties and assumptions. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of many factors, including but not limited to those under the heading “Risk Factors” beginning on page 7. We do not assume, and specifically disclaim, any obligation to update any forward-looking statement contained in this report.

Overview

The primary source of our operating revenue is provided by our Truckload segment through a combination of regional short-haul and medium-to-long-haul full-load transportation services. We transport food and other consumer packaged goods that require a temperature-controlled or insulated environment across the United States and into and out of Mexico and Canada.

Our Dedicated segment provides customized transportation solutions tailored to meet individual customers’ requirements, utilizing temperature-controlled trailers, dry vans and other specialized equipment within the United States. Our customer contracts range from three to five years and are subject to annual rate reviews.

Generally, we are paid by the mile for our Truckload and Dedicated services. We also derive Truckload and Dedicated revenue from fuel surcharges, loading and unloading activities, equipment detention and other ancillary services. The main factors that affect our Truckload and Dedicated revenue are the rate per mile we receive from our customers, the percentage of miles for which we are compensated, the number of miles we generate with our equipment and changes in fuel prices. We monitor our revenue production primarily through average Truckload and Dedicated revenue, net of fuel surcharges, per tractor per week. We also analyze our average Truckload and Dedicated revenue, net of fuel surcharges, per total mile, non-revenue miles percentage, the miles per tractor we generate, our fuel surcharge revenue, our accessorial revenue and our other sources of operating revenue.

Our Intermodal segment transports our customers’ freight within the United States primarily utilizing our temperature-controlled trailers and also, through March 2015, our dry containers on railroad flatcars for portions of trips, with the balance of the trips using our tractors or, to a lesser extent, contracted carriers. The main factors that affect our Intermodal revenue are the rate per mile and other charges we receive from our customers.

Our Brokerage segment arranges for smaller third-party carriers to transport freight for our customers in temperature-controlled trailers and dry vans within the United States and into and out of Mexico while we retain the billing, collection and customer management responsibilities. The main factors that affect our Brokerage revenue are the rate per mile and other charges we receive from our customers.

In addition to the factors discussed above, our operating revenue is also affected by, among other things, the United States economy, inventory levels, the level of truck and rail capacity in the transportation market, a contracting driver market, severe weather conditions and specific customer demand.

Our operating revenue decreased $7.9 million, or 1.2%, in 2015, reflecting a 42.2% decrease in fuel surcharge revenue to $72.3 million from $125.2 million in 2014 due to lower fuel prices. Our operating revenue, net of fuel surcharges, increased $44.9 million, or 8.2%, compared with 2014. Truckload segment revenue, net of fuel surcharges, decreased 2.9% from 2014. Dedicated segment revenue, net of fuel surcharges, increased 89.5% primarily due to an increase in our average fleet size of 83.2% from 2014. Intermodal segment revenue, net of fuel surcharges, decreased 12.7% due to the disposal in March 2015 of the overhead-intensive dry containers that were used in our intermodal operations, partially offset by increased volume with our temperature-controlled intermodal trailer service. Brokerage revenue increased 24.8% in 2015 due to an increase in volume.

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Our profitability is impacted by the variable costs of transporting freight for our customers, fixed costs, and expenses containing both fixed and variable components. The variable costs include fuel expense, driver-related expenses, such as wages, benefits, training, and recruitment, and independent contractor costs, which are recorded under purchased transportation. Expenses that have both fixed and variable components include maintenance and tire expense and our cost of insurance and claims. These expenses generally vary with the miles we travel, but also have a controllable component based on safety, fleet age, efficiency and other factors. Our main fixed costs relate to the acquisition and subsequent depreciation of long-term assets, such as revenue equipment and operating terminals. We expect our annual cost of tractor and trailer ownership will increase in future periods as a result of higher prices of new equipment, along with any increases in fleet size. Although certain factors affecting our expenses are beyond our control, we monitor them closely and attempt to anticipate changes in these factors in managing our business. For example, fuel prices have significantly fluctuated over the past several years. We manage our exposure to changes in fuel prices primarily through fuel surcharge programs with our customers, as well as through volume fuel purchasing arrangements with national fuel centers and bulk purchases of fuel at our terminals. To help further reduce fuel expense, we have installed and tightly manage the use of auxiliary power units in our tractors to provide climate control and electrical power for our drivers without idling the tractor engine, and also have improved the fuel usage in the temperature-control units on our trailers. For our Intermodal and Brokerage segments, our profitability is impacted by the percentage of revenue we pay to providers for the transportation services we arrange, which is included within purchased transportation in our consolidated statements of operations.

Our operating expenses as a percentage of operating revenue, or “operating ratio,” improved to 90.8% in 2015 from 92.4% in 2014. Operating expenses as a percentage of operating revenue, with both amounts net of fuel surcharges, improved to 89.7% in 2015 from 9 0.7% in 2014. Our operating ratio for 2015, net of both the gain on the disposition of facilities of $4.1 million and fuel surcharges, improved to 90.4%. Our net income increased by 19.8% to $35.7 million, or $1.06 per diluted share, in 2015 from $29.8 million, or $0.89 per diluted share, in 2014. The increase in profitability in 2015 was primarily driven by the $0.07 per diluted share impact of the facilities disposition gains, the disposal in March 2015 of the overhead-intensive dry containers that were used in a portion of our intermodal operations, an improvement in net fuel expense with the lower fuel prices, the negative impact that the severe weather conditions had on the first quarter of 2014 on both freight volumes and operating costs, and costs associated with rail service interruption and delay issues in 2014 that constrained our intermodal operations, partially offset by a decrease in our Truckload average revenue per tractor within a soft freight market since the second quarter of 2015 and an increase in insurance and claims in 2015.

Our business requires substantial, ongoing capital investments, particularly for new tractors and trailers. At December 31, 2015, we had $434,000 of cash and cash equivalents, $37.9 million of long-term debt outstanding and $409.4 million in stockholders’ equity. In 2015, net cash flows provided by operating activities of $128.2 million and net borrowings under our credit facility of $13.5 million were primarily used to purchase new revenue equipment, net of proceeds from dispositions, in the amount of $118.2 million, to partially construct regional operating facilities in the amount of $8.6 million, to repurchase and retire 941,024 shares of our common stock for $16.2 million and to pay cash dividends of $3.3 million. We estimate that capital expenditures, net of proceeds from dispositions, will be approximately $130 million in 2016. We believe our sources of liquidity are adequate to meet our current and anticipated needs for at least the next twelve months. Based upon anticipated cash flows, existing cash and cash equivalents balances, current borrowing availability and other sources of financing we expect to be available to us, we do not anticipate any significant liquidity constraints in the foreseeable future.

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Our business strategy encompasses a multifaceted set of transportation service solutions, primarily regional Truckload temperature-controlled operations along with Dedicated, Intermodal and Brokerage services, with a diverse customer base that gains value from and expands each of these operating segments. We believe that we are well-positioned regardless of the economic environment with the services we provide combined with our competitive position, cost control emphasis, modern fleet and strong balance sheet.

This Management’s Discussion and Analysis of Financial Condition and Results of Operations includes discussions of operating revenue, net of fuel surcharge revenue; Truckload, Dedicated and Intermodal revenue, net of fuel surcharge revenue; operating expenses as a percentage of operating revenue, each net of fuel surcharge revenue and the sum of fuel surcharge revenue and the gain on disposition of facilities; and net fuel expense (fuel and fuel taxes net of fuel surcharge revenue and surcharges passed through to independent contractors, outside drayage carriers and railroads). We provide these additional disclosures because management believes these measures provide a more consistent basis for comparing results of operations from period to period. These financial measures in this report have not been determined in accordance with U.S. generally accepted accounting principles (GAAP). Pursuant to Item 10(e) of Regulation S-K, we have included the amounts necessary to reconcile these non-GAAP financial measures to the most directly comparable GAAP financial measures of operating revenue, operating expenses divided by operating revenue, and fuel and fuel taxes.

Stock Split

On June 14, 2013, we effected a three-for-two stock split of our common stock, $.01 par value, in the form of a 50% stock dividend. Our consolidated financial statements, related notes, and other financial data contained in this report have been adjusted to give retroactive effect to the stock split for all periods presented.

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Results of Operations

The following table sets forth for the years indicated certain operating statistics regarding our revenue and operations:

|  | 20 15 |  |  | 2014 |  |  | 2013 |
Truckload Segment: |  |  |  |  |  |  |  |  |  |  |  |
Revenue (in thousands) |  | $ | 398,361 |  |  | $ | 448,273 |  |  | $ | 464,959 |
Average revenue, net of fuel surcharges, per tractor per week(1) |  | $ | 3,529 |  |  | $ | 3,618 |  |  | $ | 3,471 |
Average tractors(1) |  |  | 1,892 |  |  |  | 1,900 |  |  |  | 2,027 |
Average miles per trip |  |  | 666 |  |  |  | 682 |  |  |  | 645 |
Total miles (in thousands) |  |  | 186,268 |  |  |  | 199,168 |  |  |  | 211,122 |
Dedicated Segment: |  |  |  |  |  |  |  |  |  |  |  |
Revenue (in thousands) |  | $ | 118,272 |  |  | $ | 70,352 |  |  | $ | 42,320 |
Average revenue, net of fuel surcharges, per tractor per week(1) |  | $ | 3,433 |  |  | $ | 3,322 |  |  | $ | 3,396 |
Average tractors(1) |  |  | 599 |  |  |  | 327 |  |  |  | 189 |
Average miles per trip |  |  | 347 |  |  |  | 337 |  |  |  | 350 |
Total miles (in thousands) |  |  | 57,381 |  |  |  | 31,543 |  |  |  | 19,046 |
Intermodal Segment: |  |  |  |  |  |  |  |  |  |  |  |
Revenue (in thousands) |  | $ | 76,958 |  |  | $ | 97,092 |  |  | $ | 92,513 |
Loads |  |  | 36,404 |  |  |  | 44,336 |  |  |  | 38,316 |
Average tractors |  |  | 89 |  |  |  | 110 |  |  |  | 83 |
Brokerage Segment: |  |  |  |  |  |  |  |  |  |  |  |
Total revenue (in thousands) |  | $ | 71,403 |  |  | $ | 57,212 |  |  | $ | 59,422 |
Marten Transport |  |  |  |  |  |  |  |  |  |  |  |
Revenue (in thousands) |  | $ | 71,403 |  |  | $ | 57,212 |  |  | $ | 52,746 |
Loads |  |  | 48,060 |  |  |  | 36,712 |  |  |  | 35,140 |
MWL |  |  |  |  |  |  |  |  |  |  |  |
Revenue (in thousands) |  | $ | — |  |  | $ | — |  |  | $ | 6,676 |
Loads |  |  | — |  |  |  | — |  |  |  | 3,758 |

(1) | Includes tractors driven by both company-employed drivers and independent contractors. Independent contractors provided 65, 52 and 49 tractors as of December 31, 2015, 2014 and 2013, respectively.

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Comparison of Year Ended December 31, 2015 to Year Ended December 31, 2014

The following table sets forth for the years indicated our operating revenue, operating income and operating ratio by segment, along with the change for each component:

|  |  |  |  |  |  |  |  |  | Dollar Change |  |  | Percentage Change |
(Dollars in thousands) |  | 20 15 |  |  | 2014 |  |  | 2015 vs. 2014 |  |  | 2015 vs. 2014 |
Operating revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Truckload revenue, net of fuel surcharge revenue |  | $ | 348,101 |  |  | $ | 358,458 |  |  | $ | (10,357 | ) |  |  | (2.9 | )%
Truckload fuel surcharge revenue |  |  | 50,260 |  |  |  | 89,815 |  |  |  | (39,555 | ) |  |  | (44.0 | )
Total Truckload revenue |  |  | 398,361 |  |  |  | 448,273 |  |  |  | (49,912 | ) |  |  | (11.1 | )
Dedicated revenue, net of fuel surcharge revenue |  |  | 107,264 |  |  |  | 56,609 |  |  |  | 50,655 |  |  |  | 89.5 |
Dedicated fuel surcharge revenue |  |  | 11,008 |  |  |  | 13,743 |  |  |  | (2,735 | ) |  |  | (19.9 | )
Total Dedicated revenue |  |  | 118,272 |  |  |  | 70,352 |  |  |  | 47,920 |  |  |  | 68.1 |
Intermodal revenue, net of fuel surcharge revenue |  |  | 65,877 |  |  |  | 75,447 |  |  |  | (9,570 | ) |  |  | (12.7 | )
Intermodal fuel surcharge revenue |  |  | 11,081 |  |  |  | 21,645 |  |  |  | (10,564 | ) |  |  | (48.8 | )
Total Intermodal revenue |  |  | 76,958 |  |  |  | 97,092 |  |  |  | (20,134 | ) |  |  | (20.7 | )
Brokerage revenue |  |  | 71,403 |  |  |  | 57,212 |  |  |  | 14,191 |  |  |  | 24.8 |
Total operating revenue |  | $ | 664,994 |  |  | $ | 672,929 |  |  | $ | (7,935 | ) |  |  | (1.2 | )%
Operating income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Truckload |  | $ | 35,517 |  |  | $ | 39,483 |  |  | $ | (3,966 | ) |  |  | (10.0 | )%
Dedicated |  |  | 12,818 |  |  |  | 7,136 |  |  |  | 5,682 |  |  |  | 79.6 |
Intermodal |  |  | 4,832 |  |  |  | 1,735 |  |  |  | 3,097 |  |  |  | 178.5 |
Brokerage |  |  | 3,792 |  |  |  | 2,652 |  |  |  | 1,140 |  |  |  | 43.0 |
Total operating income before gain on disposition of facilities |  |  | 56,959 |  |  |  | 51,006 |  |  |  | 5,953 |  |  |  | 11.7 |
Gain on disposition of facilities |  |  | 4,104 |  |  |  | - |  |  |  | 4,104 |  |  |  | N/A |
Total operating income |  | $ | 61,063 |  |  | $ | 51,006 |  |  | $ | 10,057 |  |  |  | 19.7 | %
Operating ratio(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Truckload |  |  | 91.1 | % |  |  | 91.2 | % |  |  |  |  |  |  |  |
Dedicated |  |  | 89.2 |  |  |  | 89.9 |  |  |  |  |  |  |  |  |
Intermodal |  |  | 93.7 |  |  |  | 98.2 |  |  |  |  |  |  |  |  |
Brokerage |  |  | 94.7 |  |  |  | 95.4 |  |  |  |  |  |  |  |  |
Consolidated operating ratio before gain on disposition of facilities |  |  | 91.4 | % |  |  | 92.4 | % |  |  |  |  |  |  |  |
Consolidated operating ratio |  |  | 90.8 | % |  |  | 92.4 | % |  |  |  |  |  |  |  |

(1) | Represents operating expenses as a percentage of operating revenue.

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Our operating revenue decreased $7.9 million, or 1.2%, to $665.0 million in 2015 from $672.9 million in 2014, reflecting a 42.2% decrease in fuel surcharge revenue to $72.3 million from $125.2 million in 2014 due to lower fuel prices. Our operating revenue, net of fuel surcharges, increased $44.9 million, or 8.2%, to $592.6 million in 2015 from $547.7 million in 2014. This increase was due to a $50.7 million increase in Dedicated revenue, net of fuel surcharges, and a $14.2 million increase in Brokerage revenue, partially offset by a $10.4 million decrease in Truckload revenue, net of fuel surcharges, and a $9.6 million decrease in Intermodal revenue, net of fuel surcharges.

Truckload segment revenue decreased $49.9 million, or 11.1%, to $398.4 million in 2015 from $448.3 million in 2014. Truckload segment revenue, net of fuel surcharges, decreased $10.4 million, or 2.9%, to $348.1 million in 2015 from $358.5 million in 2014. The slight improvement in the operating ratio in 2015 was primarily due to an improvement in our net fuel expense with the lower fuel prices and the negative impact of severe weather conditions in the first quarter of 2014 on both freight volumes and operating costs, partially offset by a decrease in our average revenue per tractor within a soft freight market since the second quarter of 2015.

Dedicated segment revenue increased $47.9 million, or 68.1%, to $118.3 million in 2015 from $70.4 million in 2015. Dedicated segment revenue, net of fuel surcharges, increased 89.5% primarily due to an increase in our average fleet size of 83.2% driven by a significant increase in our number of Dedicated contracts with customers. The improvement in the operating ratio in 2015 was primarily due to an increase in our average revenue per tractor.

Intermodal segment revenue decreased $20.1 million, or 20.7%, to $77.0 million in 2015 from $97.1 million in 2014. Intermodal segment revenue, net of fuel surcharges, decreased 12.7% due to the disposal in March 2015 of the dry containers that were used in a portion of our intermodal operations, partially offset by increased volume with our temperature-controlled intermodal trailer service. The improvement in the operating ratio in 2015 was primarily due to costs associated with rail service interruption and delay issues in 2014 that constrained our intermodal operations, the disposal of our dry container service, which produced a higher operating ratio than our temperature-controlled trailer service, rate increases beginning in the fourth quarter of 2014, and the negative impact of severe weather conditions in the first quarter of 2014 on both freight volumes and operating costs.

Brokerage segment revenue increased $14.2 million, or 24.8%, to $71.4 million in 2015 from $57.2 million in 2014, primarily due to an increase in volume. The improvement in the operating ratio in 2015 was primarily due to a decrease in the payments to carriers for transportation services which we arranged as a percentage of our Brokerage revenue.

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The following table sets forth for the years indicated the dollar and percentage increase or decrease of the items in our consolidated statements of operations, and those items as a percentage of operating revenue:

|  | Dollar Change |  |  | Percentage Change |  |  | Percentage of Operating Revenue |
(Dollars in thousands) |  | 2015 vs. 2014 |  |  | 2015 vs. 2014 |  |  | 2015 |  |  | 2014 |
Operating revenue |  | $ | (7,935 | ) |  |  | (1.2 | )% |  |  | 100.0 | % |  |  | 100.0 | %
Operating expenses (income): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries, wages and benefits |  |  | 25,991 |  |  |  | 14.2 |  |  |  | 31.5 |  |  |  | 27.3 |
Purchased transportation |  |  | (4,987 | ) |  |  | (4.1 | ) |  |  | 17.7 |  |  |  | 18.3 |
Fuel and fuel taxes |  |  | (49,349 | ) |  |  | (32.1 | ) |  |  | 15.7 |  |  |  | 22.9 |
Supplies and maintenance |  |  | 1,829 |  |  |  | 4.4 |  |  |  | 6.5 |  |  |  | 6.2 |
Depreciation |  |  | 7,080 |  |  |  | 10.4 |  |  |  | 11.3 |  |  |  | 10.1 |
Operating taxes and licenses |  |  | 1,774 |  |  |  | 24.8 |  |  |  | 1.3 |  |  |  | 1.1 |
Insurance and claims |  |  | 2,012 |  |  |  | 7.4 |  |  |  | 4.4 |  |  |  | 4.0 |
Communications and utilities |  |  | 88 |  |  |  | 1.5 |  |  |  | 0.9 |  |  |  | 0.9 |
Gain on disposition of revenue equipment |  |  | (1,197 | ) |  |  | (27.3 | ) |  |  | (0.8 | ) |  |  | (0.7 | )
Gain on disposition of facilities |  |  | (4,104 | ) |  |  | N/A |  |  |  | (0.6 | ) |  |  | - |
Other |  |  | 2,871 |  |  |  | 18.0 |  |  |  | 2.8 |  |  |  | 2.4 |
Total operating expenses |  |  | (17,992 | ) |  |  | (2.9 | ) |  |  | 90.8 |  |  |  | 92.4 |
Operating income |  |  | 10,057 |  |  |  | 19.7 |  |  |  | 9.2 |  |  |  | 7.6 |
Other |  |  | 1,039 |  |  |  | 155.8 |  |  |  | 0.1 |  |  |  | (0.1 | )
Income before income taxes |  |  | 9,018 |  |  |  | 17.5 |  |  |  | 9.1 |  |  |  | 7.7 |
Provision for income taxes |  |  | 3,107 |  |  |  | 14.2 |  |  |  | 3.8 |  |  |  | 3.2 |
Net income |  | $ | 5,911 |  |  |  | 19.8 | % |  |  | 5.4 | % |  |  | 4.4 | %

Salaries, wages and benefits consist of compensation for our employees, including both driver and non-driver employees, employees’ health insurance, 401(k) plan contributions and other fringe benefits. These expenses vary depending upon the size of our Truckload, Dedicated and Intermodal tractor fleets, the ratio of company drivers to independent contractors, our efficiency, our experience with employees’ health insurance claims, changes in health care premiums and other factors. The increase in salaries, wages and benefits from 2014 resulted primarily from a 5.2% increase in the total miles driven by company drivers and increases to several components of the amount paid to company drivers. Employees’ health insurance costs increased $2.1 million due to higher self-insured medical claims and bonus compensation expense for our non-driver employees increased $1.0 million as well.

Purchased transportation consists of payments to railroads and carriers for transportation services we arrange in connection with Brokerage and Intermodal operations and to independent contractor providers of revenue equipment. This category will vary depending upon the amount and rates, including fuel surcharges, we pay to third-party railroad and motor carriers, the ratio of company drivers versus independent contractors and the amount of fuel surcharges passed through to independent contractors. Purchased transportation expense decreased $5.0 million in total, or 4.1%, in 2015 from 2014. Payments to carriers for transportation services we arranged in our Brokerage segment increased $11.4 million to $60.5 million in 2015 from $49.1 million in 2014, primarily due to an increase in volume. Payments to railroads and drayage carriers for transportation services within our Intermodal segment decreased $17.1 million to $49.3 million in 2015 from $66.4 million in 2014. This decrease was due to the disposal in March 2015 of the dry containers that were used in a portion of our intermodal operations, partially offset by increased volume with our temperature-controlled intermodal trailer service. The portion of purchased transportation expense related to our independent contractors within our Truckload and Dedicated segments, including fuel surcharges, increased $704,000 in 2015. We expect that purchased transportation expense will increase as we grow our Intermodal and Brokerage segments.

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Fuel and fuel taxes decreased by $49.3 million in 2015 from 2014. Net fuel expense (fuel and fuel taxes net of fuel surcharge revenue and surcharges passed through to independent contractors, outside drayage carriers and railroads) decreased $5.6 million, or 12.0%, to $41.1 million in 2015 from $46.7 million in 2014. Fuel surcharges passed through to independent contractors, outside drayage carriers and railroads were $8.9 million in 2015 and $18.0 million in 2014. We have worked diligently to control fuel usage and costs by improving our volume purchasing arrangements and optimizing our drivers’ fuel purchases with national fuel centers, focusing on shorter lengths of haul, installing and tightly managing the use of auxiliary power units in our tractors to minimize engine idling and improving fuel usage in the temperature-control units on our trailers. Auxiliary power units, which we have installed in our company-owned tractors, provide climate control and electrical power for our drivers without idling the tractor engine. The decrease in net fuel expense was primarily due to a decrease in the DOE national average cost of fuel to $2.71 per gallon in 2015 from $3.83 per gallon in 2014 and continued progress with the cost control measures stated above. Net fuel expense represented 7.9% of Truckload, Dedicated and Intermodal segment revenue, net of fuel surcharges, in 2015, compared with 9.5% in 2014.

Supplies and maintenance consist of repairs, maintenance, tires, parts, oil, and engine fluids, along with load-specific expenses including loading/unloading, tolls, pallets and trailer hostling. Our supplies and maintenance expense increased $1.8 million, or 4.4%, from 2014 primarily due to increased repair costs at external facilities.

Depreciation relates to owned tractors, trailers, auxiliary power units, communication units, terminal facilities and other assets. The increase in depreciation was primarily due to a continued increase in the cost of revenue equipment and growth of our fleet. We expect our annual cost of tractor and trailer ownership will increase in future periods as a result of higher prices of new equipment, which will result in greater depreciation over the useful life.

Insurance and claims consist of the costs of insurance premiums and accruals we make for claims within our self-insured retention amounts, primarily for personal injury, property damage, physical damage to our equipment, cargo claims and workers’ compensation claims. These expenses will vary primarily based upon the frequency and severity of our accident experience, our self-insured retention levels and the market for insurance. The $2.0 million increase in insurance and claims in 2015 was primarily due to increases in the cost of physical damage claims related to our tractors and trailers, self-insured auto liability claims and workers’ compensation accident claims. Our significant self-insured retention exposes us to the possibility of significant fluctuations in claims expense between periods which could materially impact our financial results depending on the frequency, severity and timing of claims.

Gain on disposition of revenue equipment increased to $5.6 million in 2015 from $4.4 million in 2014 primarily due to an increase in the number of trailers sold. Future gains or losses on dispositions of revenue equipment will be impacted by the market for used revenue equipment, which is beyond our control.

Gain on disposition of facilities was $4.1 million in 2015. The disposition of the facilities, located in Ontario, CA and Indianapolis, IN, was part of our ongoing program to expand and update the footprint of our facilities throughout the United States, in which we have spent over $83 million since 2009. Any future gains or losses on disposition of facilities will be impacted by the market for real estate, which is beyond our control.

As a result of the foregoing factors, our operating expenses as a percentage of operating revenue, or “operating ratio,” improved to 90.8% in 2015 from 92.4% in 2014. The operating ratio for our Truckload segment was 91.1% in 2015 and 91.2% in 2014, for our Dedicated segment was 89.2% in 2015 and 89.9% in 2014, for our Intermodal segment was 93.7% in 2015 and 98.2% in 2014, and for our Brokerage segment was 94.7% in 2015 and 95.4% in 2014. Operating expenses as a percentage of operating revenue, with both amounts net of fuel surcharges, improved to 89.7% in 2015 from 90.7% in 2014. Our operating ratio for 2015, net of both the gain on the disposition of facilities and fuel surcharges, improved to 90.4%.

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The decrease in other non-operating income was primarily due to decreased earnings in 2015 by MWL, a 45% owned affiliate.

Our effective income tax rate decreased to 41.1% in 2015 from 42.3% in 2014, primarily due to per diem and other non-deductible expenses being a lower percentage of the increased taxable income in 2015.

As a result of the factors described above, net income increased by 19.8% to $35.7 million in 2015 from $29.8 million in 2014. Net earnings per diluted share increased to $1.06 in 2015 from $0.89 in 2014.

Comparison of Year Ended December 31, 2014 to Year Ended December 31, 2013

The following table sets forth for the years indicated our operating revenue, operating income and operating ratio by segment, along with the change for each component:

|  |  |  |  |  |  |  |  |  | Dollar Change |  |  | Percentage Change |
(Dollars in thousands) |  | 2014 |  |  | 2013 |  |  | 2014 vs. 2013 |  |  | 2014 vs. 2013 |
Operating revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Truckload revenue, net of fuel surcharge revenue |  | $ | 358,458 |  |  | $ | 366,798 |  |  | $ | (8,340 | ) |  |  | (2.3 | )%
Truckload fuel surcharge revenue |  |  | 89,815 |  |  |  | 98,161 |  |  |  | (8,346 | ) |  |  | (8.5 | )
Total Truckload revenue |  |  | 448,273 |  |  |  | 464,959 |  |  |  | (16,686 | ) |  |  | (3.6 | )
Dedicated revenue, net of fuel surcharge revenue |  |  | 56,609 |  |  |  | 33,526 |  |  |  | 23,083 |  |  |  | 68.9 |
Dedicated fuel surcharge revenue |  |  | 13,743 |  |  |  | 8,794 |  |  |  | 4,949 |  |  |  | 56.3 |
Total Dedicated revenue |  |  | 70,352 |  |  |  | 42,320 |  |  |  | 28,032 |  |  |  | 66.2 |
Intermodal revenue, net of fuel surcharge revenue |  |  | 75,447 |  |  |  | 71,764 |  |  |  | 3,683 |  |  |  | 5.1 |
Intermodal fuel surcharge revenue |  |  | 21,645 |  |  |  | 20,749 |  |  |  | 896 |  |  |  | 4.3 |
Total Intermodal revenue |  |  | 97,092 |  |  |  | 92,513 |  |  |  | 4,579 |  |  |  | 4.9 |
Brokerage revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marten Transport |  |  | 57,212 |  |  |  | 52,746 |  |  |  | 4,466 |  |  |  | 8.5 |
MWL(1) |  |  | — |  |  |  | 6,676 |  |  |  | (6,676 | ) |  |  | (100.0 | )
Total Brokerage revenue |  |  | 57,212 |  |  |  | 59,422 |  |  |  | (2,210 | ) |  |  | (3.7 | )
Total operating revenue |  | $ | 672,929 |  |  | $ | 659,214 |  |  | $ | 13,715 |  |  |  | 2.1 | %
Operating income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Truckload |  | $ | 39,483 |  |  | $ | 39,290 |  |  | $ | 193 |  |  |  | 0.5 | %
Dedicated |  |  | 7,136 |  |  |  | 5,575 |  |  |  | 1,561 |  |  |  | 28.0 |
Intermodal |  |  | 1,735 |  |  |  | 4,014 |  |  |  | (2,279 | ) |  |  | (56.8 | )
Brokerage |  |  | 2,652 |  |  |  | 3,116 |  |  |  | (464 | ) |  |  | (14.9 | )
Total operating income |  | $ | 51,006 |  |  | $ | 51,995 |  |  | $ | (989 | ) |  |  | (1.9 | )%
Operating ratio(2): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Truckload |  |  | 91.2 | % |  |  | 91.5 | % |  |  |  |  |  |  |  |
Dedicated |  |  | 89.9 |  |  |  | 86.8 |  |  |  |  |  |  |  |  |
Intermodal |  |  | 98.2 |  |  |  | 95.7 |  |  |  |  |  |  |  |  |
Brokerage |  |  | 95.4 |  |  |  | 94.8 |  |  |  |  |  |  |  |  |
Consolidated operating ratio |  |  | 92.4 | % |  |  | 92.1 | % |  |  |  |  |  |  |  |

(1) | Brokerage revenue is net of $2.1 million of inter-segment revenue in 2013 for loads transported by our tractors and arranged by MWL that have been eliminated in consolidation. The inter-segment revenue in 2013 relates to loads transported prior to the deconsolidation of MWL effective March 28, 2013.

(2) | Represents operating expenses as a percentage of operating revenue.

26

Our operating revenue increased $13.7 million, or 2.1%, to $672.9 million in 2014 from $659.2 million in 2013. Our operating revenue, net of fuel surcharges and MWL revenue, increased $22.9 million, or 4.4%, to $547.7 million in 2014 from $524.8 million in 2013. This increase was primarily due to a $23.1 million increase in Dedicated revenue, net of fuel surcharges. Fuel surcharge revenue decreased to $125.2 million in 2014 from $127.7 million in 2013.

Truckload segment revenue decreased $16.7 million, or 3.6%, to $448.3 million in 2014 from $465.0 million in 2013. Truckload segment revenue, net of fuel surcharges, decreased 2.3% primarily due to a decrease in our average fleet size of 6.3% from 2013, partially offset by an increase in our average revenue, net of fuel surcharges, per tractor per week of 4.2%. The increase in our average revenue per tractor was primarily due to an increase in our average rate per mile. The improvement in the operating ratio in 2014 was due to an increase in our average revenue per tractor, partially offset by the negative impact of severe weather conditions in the first quarter of 2014 on both freight volumes and operating costs.

Dedicated segment revenue increased $28.0 million, or 66.2%, to $70.4 million in 2014 from $42.3 million in 2013. Dedicated segment revenue, net of fuel surcharges, increased 68.9% primarily due to an increase in our average fleet size of 73.0% driven by a significant increase in our number of Dedicated contracts with customers, partially offset by a 2.2% decrease in our average revenue, net of fuel surcharges, per tractor per week from 2013. The increase in the operating ratio for our Dedicated segment in 2014 was primarily due to the addition of contracts with higher operating ratios than the average in 2013, along with the negative impact of severe weather conditions in the first quarter of 2014 on both freight volumes and operating costs.

Intermodal segment revenue increased $4.6 million, or 4.9%, to $97.1 million in 2014 from $92.5 million in 2013. Intermodal segment revenue, net of fuel surcharges, increased 5.1% due to continued volume growth in our Intermodal services. The increase in the operating ratio for our Intermodal segment in 2014 was primarily due to costs associated with rail service interruption and delay issues that constrained our Intermodal operations, volume growth in our dry container service, which produces a higher operating ratio than our temperature-controlled trailer service, and the negative impact of severe weather conditions in the first quarter of 2014 on both freight volumes and operating costs.

Brokerage segment revenue decreased $2.2 million, or 3.7%, to $57.2 million in 2014 from $59.4 million in 2013. Marten Transport Brokerage revenue increased $4.5 million in 2014 due to an increase in volume. With the March 28, 2013 deconsolidation of MWL, MWL revenue included in our Brokerage segment decreased $6.7 million in 2014. The increase in the operating ratio for our Brokerage segment in 2014 was primarily due to an increase in the payments to carriers for transportation services which we arranged as a percentage of our Brokerage revenue.

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The following table sets forth for the years indicated the dollar and percentage increase or decrease of the items in our consolidated statements of operations, and those items as a percentage of operating revenue:

| Dollar Change |  | Percentage Change |  | Percentage of Operating Revenue |
(Dollars in thousands) | 2014 vs. 2013 |  | 2014 vs. 2013 |  | 2014 |  | 2013 |
Operating revenue | $ | 13,715 |  |  | 2.1 | % |  | 100.0 | % |  | 100.0 | %
Operating expenses (income): |  |  |  |  |  |  |  |  |  |  |  |
Salaries, wages and benefits |  | 12,150 |  |  | 7.1 |  |  | 27.3 |  |  | 26.0 |
Purchased transportation |  | (419 | ) |  | (0.3 | ) |  | 18.3 |  |  | 18.7 |
Fuel and fuel taxes |  | (9,339 | ) |  | (5.7 | ) |  | 22.9 |  |  | 24.8 |
Supplies and maintenance |  | 908 |  |  | 2.2 |  |  | 6.2 |  |  | 6.2 |
Depreciation |  | 3,767 |  |  | 5.8 |  |  | 10.1 |  |  | 9.8 |
Operating taxes and licenses |  | 30 |  |  | 0.4 |  |  | 1.1 |  |  | 1.1 |
Insurance and claims |  | 3,559 |  |  | 15.0 |  |  | 4.0 |  |  | 3.6 |
Communications and utilities |  | 586 |  |  | 11.2 |  |  | 0.9 |  |  | 0.8 |
Gain on disposition of revenue equipment |  | 1,585 |  |  | 26.5 |  |  | (0.7 | ) |  | (0.9 | )
Other |  | 1,877 |  |  | 13.3 |  |  | 2.4 |  |  | 2.1 |
Total operating expenses |  | 14,704 |  |  | 2.4 |  |  | 92.4 |  |  | 92.1 |
Operating income |  | (989 | ) |  | (1.9 | ) |  | 7.6 |  |  | 7.9 |
Other |  | (275 | ) |  | (70.2 | ) |  | (0.1 | ) |  | (0.1 | )
Income before income taxes |  | (714 | ) |  | (1.4 | ) |  | 7.7 |  |  | 7.9 |
Less: Income before income taxes attributable to noncontrolling interest |  | (84 | ) |  | (100.0 | ) |  | - |  |  | - |
Income before income taxes attributable to Marten Transport, Ltd. |  | (630 | ) |  | (1.2 | ) |  | 7.7 |  |  | 7.9 |
Provision for income taxes |  | (317 | ) |  | (1.4 | ) |  | 3.2 |  |  | 3.4 |
Net income | $ | (313 | ) |  | (1.0 | )% |  | 4.4 | % |  | 4.6 | %

The increase in salaries, wages and benefits from 2013 resulted primarily from increases to several components of the amount paid to company drivers during 2014 and an increase in employees’ health insurance expense of $3.3 million due to an increase in our self-insured medical claims, which was partially offset by an $800,000 decrease in bonus compensation expense for our non-driver employees.

Purchased transportation expense decreased $419,000 in total, or 0.3%, in 2014 from 2013. Payments to carriers for transportation services we arranged in our Brokerage segment increased $3.5 million to $49.1 million in 2014 from $45.6 million in 2013. With the March 28, 2013 deconsolidation of MWL, there was no purchased transportation expense related to MWL included in the Brokerage segment in 2014 compared with $5.4 million in 2013. Payments to railroads and drayage carriers for transportation services within our Intermodal segment increased $1.3 million to $66.4 million in 2014 from $65.1 million in 2013. The portion of purchased transportation expense related to our independent contractors within our Truckload and Dedicated segments, including fuel surcharges, increased $266,000 in 2014.

Fuel and fuel taxes decreased by $9.3 million in 2014 from 2013. Net fuel expense (fuel and fuel taxes net of fuel surcharge revenue and surcharges passed through to independent contractors, outside drayage carriers and railroads) decreased $6.8 million, or 12.6%, to $46.7 million in 2014 from $53.4 million in 2013. Fuel surcharges passed through to independent contractors, outside drayage carriers and railroads were $18.0 million in 2014 and $17.9 million in 2013. We have worked diligently to control fuel usage and costs by improving our volume purchasing arrangements and optimizing our drivers’ fuel purchases with national fuel centers, focusing on shorter lengths of haul, installing and tightly managing the use of auxiliary power units in our tractors to minimize engine idling and improving fuel usage in the temperature-control units on our trailers. The decrease in net fuel expense was primarily due to continued progress with the cost control measures stated above and a decrease in the DOE national average cost of fuel to $3.83 per gallon in 2014 from $3.92 per gallon in 2013. Net fuel expense represented 9.5% of Truckload, Dedicated and Intermodal segment revenue, net of fuel surcharges, in 2014, compared with 11.3% in 2013.

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The increase in depreciation was primarily due to a continued increase in the cost of revenue equipment.

The $3.6 million increase in insurance and claims in 2014 was primarily due to an increase in the cost of our self-insured auto liability, workers’ compensation and cargo claims.

Gain on disposition of revenue equipment decreased to $4.4 million in 2014 from $6.0 million in 2013 due to a decrease in the market value for used revenue equipment and a decrease in the number of tractors sold.

As a result of the foregoing factors, our operating expenses as a percentage of operating revenue, or “operating ratio,” increased to 92.4% in 2014 from 92.1% in 2013. The operating ratio for our Truckload segment was 91.2% in 2014 and 91.5% in 2013, for our Dedicated segment was 89.9% in 2014 and 86.8% in 2013, for our Intermodal segment was 98.2% in 2014 and 95.7% in 2013, and for our Brokerage segment was 95.4% in 2014 and 94.8% in 2013. Operating expenses as a percentage of operating revenue, with both amounts net of fuel surcharge revenue, increased to 90.7% in 2014 from 90.2% in 2013.

Our effective income tax rate decreased slightly to 42.3% in 2014 from 42.4% in 2013.

As a result of the factors described above, net income decreased to $29.8 million in 2014 from $30.1 million in 2013. Net earnings per diluted share decreased to $0.89 in 2014 from $0.90 in 2013.

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Liquidity and Capital Resources

Our business requires substantial, ongoing capital investments, particularly for new tractors and trailers. Our primary sources of liquidity are funds provided by operations and our revolving credit facility. A portion of our tractor fleet is provided by independent contractors who own and operate their own equipment. We have no capital expenditure requirements relating to those drivers who own their tractors or obtain financing through third parties.

The table below reflects our net cash flows provided by operating activities, net cash flows used for investing activities and net cash flows (used for) provided by financing activities for the years indicated.

(In thousands) |  | 20 1 5 |  |  | 2014 |  |  | 2013 |
Net cash flows provided by operating activities |  | $ | 128,238 |  |  | $ | 81,971 |  |  | $ | 89,187 |
Net cash flows used for investing activities |  |  | (125,081 | ) |  |  | (118,606 | ) |  |  | (74,722 | )
Net cash flows (used for) provided by financing activities |  |  | (2,846 | ) |  |  | 23,108 |  |  |  | (4,288 | )

In December 2007, our Board of Directors approved and we announced a share repurchase program to repurchase up to one million shares of our common stock either through purchases on the open market or through private transactions and in accordance with Rule 10b-18 of the Exchange Act. On November 4, 2015, our Board of Directors approved and we announced an increase in the share repurchase program, providing for the repurchase of up to $40 million, or approximately 2 million shares, of our common stock. The timing and extent to which we repurchase shares depends on market conditions and other corporate considerations. The repurchase program does not have an expiration date. In the fourth quarter of 2015 we repurchased and retired 941,024 shares of our common stock for $16.2 million.

In 2015, net cash flows provided by operating activities of $128.2 million and net borrowings under our credit facility of $13.5 million were primarily used to purchase new revenue equipment, net of proceeds from dispositions, in the amount of $118.2 million, to partially construct regional operating facilities in the amount of $8.6 million, to repurchase and retire 941,024 shares of our common stock for $16.2 million, and to pay cash dividends of $3.3 million. In 2014, net cash flows provided by operating activities of $82.0 million, borrowings under our credit facility of $24.4 million, and cash and cash equivalents of $13.5 million were primarily used to purchase new revenue equipment, net of proceeds from dispositions, in the amount of $87.7 million, to acquire and partially construct regional operating facilities in the amount of $27.4 million, and to pay cash dividends of $3.3 million. In 2013, net cash flows provided by operating activities of $89.2 million were primarily used to purchase new revenue equipment, net of proceeds from dispositions, in the amount of $54.8 million, to partially construct and acquire regional operating facilities in the amount of $16.9 million, to pay cash dividends of $2.8 million, to repay $2.7 million of long-term debt, and to increase cash and cash equivalents by $10.2 million.

We estimate that capital expenditures, net of proceeds from dispositions, will be approximately $130 million in 2016. Quarterly cash dividends of $0.025 per share of common stock were declared in each quarter of 2015 and 2014 and totaled $3.3 million in each of 2015 and 2014. Quarterly cash dividends of $0.017 per share were declared in each of the first and second quarters of 2013, and of $0.025 per share were declared in each of the third and fourth quarters of 2013, totaling $2.8 million. We currently expect to continue to pay quarterly cash dividends in the future. The payment of cash dividends in the future, and the amount of any such dividends, will depend upon our financial condition, results of operations, cash requirements, and certain corporate law requirements, as well as other factors deemed relevant by our Board of Directors. We believe our sources of liquidity are adequate to meet our current and anticipated needs for at least the next twelve months. Based upon anticipated cash flows, existing cash and cash equivalents balances, current borrowing availability and other sources of financing we expect to be available to us, we do not anticipate any significant liquidity constraints in the foreseeable future.

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We maintain a credit agreement that provides for an unsecured committed credit facility which matures in December 2019. In November 2015, we entered into an amendment to the facility which increased the aggregate principal amount of the facility from $50.0 million to $75.0 million. At December 31, 2015, there was an outstanding principal balance of $37.9 million on the facility. As of that date, we had outstanding standby letters of credit of $10.4 million and remaining borrowing availability of $26.7 million. This facility bears interest at a variable rate based on the London Interbank Offered Rate or the lender’s Prime Rate, in each case plus/minus applicable margins.

Our credit facility prohibits us from paying, in any fiscal year, stock redemptions and dividends in excess of 25% of our net income from the prior fiscal year. A waiver of the 25% limitation for 2015 and 2016, should it apply, was obtained from the lender. This facility also contains restrictive covenants which, among other matters, require us to maintain compliance with cash flow leverage and fixed charge coverage ratios. We were in compliance with all covenants at December 31, 2015.

The following is a summary of our contractual obligations as of December 31, 2015.

|  | Payments Due by Period |
(In thousands) |  | 2016 |  |  | 2017 And 2018 |  |  | 2019 And 2020 |  |  | Thereafter |  |  | Total |
Purchase obligations for revenue equipment |  | $ | 38,754 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 38,754 |
Long-term debt obligations |  |  | — |  |  |  | — |  |  |  | 37,867 |  |  |  | — |  |  |  | 37,867 |
Building construction obligations |  |  | 1,955 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,955 |
Operating lease obligations |  |  | 328 |  |  |  | 133 |  |  |  | 3 |  |  |  | — |  |  |  | 464 |
Total |  | $ | 41,037 |  |  | $ | 133 |  |  | $ | 37,870 |  |  | $ | — |  |  | $ | 79,040 |

Due to uncertainty with respect to the timing of future cash flows, the obligation under our nonqualified deferred compensation plan at December 31, 2015 of 90,143 shares of Company common stock with a value of $1.6 million has been excluded from the above table.

Related Parties

We purchase fuel and tires and obtain related services from Bauer Built, Inc., or BBI. Jerry M. Bauer, one of our directors, is the chairman of the board, chief executive officer and the principal stockholder of BBI. We paid BBI $335,000 in 2015, $562,000 in 2014 and $585,000 in 2013 for fuel, tires and related services. In addition, we paid $1.5 million in 2015, $1.4 million in 2014 and $1.6 million in 2013 to tire manufacturers for tires that were provided by BBI. BBI received commissions from the tire manufacturers related to these purchases. Other than any benefit received from his ownership interest, Mr. Bauer receives no compensation or other benefits from our business with BBI.

We own a 45% equity interest in MWL, a third-party provider of logistics services to the transportation industry. We received $5.0 million, $8.5 million and $8.2 million of our revenue for loads transported by our tractors and arranged by MWL in 2015, 2014 and 2013, respectively. Prior to deconsolidation effective March 28, 2013, these inter-segment revenues were eliminated in consolidation. Inter-segment revenue eliminated in consolidation was $2.1 million in 2013. As of December 31, 2015, we also had a trade receivable in the amount of $204,000 from MWL and an accrued liability of $4.3 million to MWL for the excess of payments by MWL’s customers into our lockbox account over the amounts drawn on the account by MWL.

We believe that the transactions with related parties noted above are on reasonable terms which, based upon market rates, are comparable to terms available from unaffiliated third parties.

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Off-balance Sheet Arrangements

Other than standby letters of credit maintained in connection with our self-insurance programs in the amount of $10.4 million and operating leases summarized above in our summary of contractual obligations, we did not have any other material off-balance sheet arrangements at December 31, 2015.

Inflation and Fuel Costs

Most of our operating expenses are inflation-sensitive, with inflation generally producing increased costs of operations. During the past three years, the most significant effects of inflation have been on revenue equipment prices, accident claims, health insurance and employee compensation. We attempt to limit the effects of inflation through increases in freight rates and cost control efforts.

In addition to inflation, fluctuations in fuel prices can affect our profitability. We require substantial amounts of fuel to operate our tractors and power the temperature-control units on our trailers. Substantially all of our contracts with customers contain fuel surcharge provisions. Although we historically have been able to pass through a significant portion of long-term increases in fuel prices and related taxes to customers in the form of fuel surcharges and higher rates, such increases usually are not fully recovered. These fuel surcharge provisions are not effective in mitigating the fuel price increases related to non-revenue miles or fuel used while the tractor is idling.

Seasonality

Our tractor productivity generally decreases during the winter season because inclement weather impedes operations and some shippers reduce their shipments. At the same time, operating expenses generally increase, with harsh weather creating higher accident frequency, increased claims, lower fuel efficiency and more equipment repairs.

Critical Accounting Policies

The preparation of financial statements in conformity with U.S. generally accepted accounting principles 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 that the following critical accounting policies affect our more significant estimates, assumptions and judgments used in the preparation of our consolidated financial statements.

Revenue Recognition. We recognize revenue, including fuel surcharges, at the time shipment of freight is completed. We account for revenue of our Intermodal and Brokerage segments and revenue on freight transported by independent contractors within our Truckload and Dedicated segments on a gross basis because we are the primary obligor in the arrangements, we have the ability to establish prices, we have the risk of loss in the event of cargo claims and we bear credit risk with customer payments. Accordingly, all such revenue billed to customers is classified as operating revenue and all corresponding payments to carriers for transportation services we arrange in connection with brokerage and intermodal activities and to independent contractor providers of revenue equipment are classified as purchased transportation expense.

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Accounts Receivable. We are dependent upon a limited number of customers, and, as a result, our trade accounts receivable are highly concentrated. Trade accounts receivable are recorded at the invoiced amounts, net of an allowance for doubtful accounts. Our allowance for doubtful accounts was $305,000 as of December 31, 2015 and $475,000 as of December 31, 2014. A considerable amount of judgment is required in assessing the realization of these receivables including the current creditworthiness of each customer and related aging of the past-due balances, including any billing disputes. In order to assess the collectibility of these receivables, we perform ongoing credit evaluations of our customers’ financial condition. Through these evaluations, we may become aware of a situation where a customer may not be able to meet its financial obligations due to deterioration of its financial viability, credit ratings or bankruptcy. The allowance for doubtful accounts is based on the best information available to us and is reevaluated and adjusted as additional information is received. We evaluate the allowance based on historical write-off experience, the size of the individual customer balances, past-due amounts and the overall national economy. We review the adequacy of our allowance for doubtful accounts monthly.

Property and Equipment. The transportation industry requires significant capital investments. Our net property and equipment was $528.0 million as of December 31, 2015 and $465.7 million as of December 31, 2014. Our depreciation expense was $75.3 million in 2015, $68.2 million in 2014 and $64.5 million in 2013. We compute depreciation of our property and equipment for financial reporting purposes based on the cost of each asset, reduced by its estimated salvage value, using the straight-line method over its estimated useful life. We determine and periodically evaluate our estimate of the projected salvage values and useful lives primarily by considering the market for used equipment, prior useful lives and changes in technology. We have not changed our policy regarding salvage values as a percentage of initial cost or useful lives of tractors and trailers within the last ten years. We believe that our policies and past estimates have been reasonable. Actual results could differ from these estimates. A 5% decrease in estimated salvage values would have decreased our net property and equipment as of December 31, 2015 by approximately $10.0 million, or 1.9%.

Impairment of Assets. Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future net undiscounted cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the costs to sell.

Insurance and Claims. We self-insure, in part, for losses relating to workers’ compensation, auto liability, general liability, cargo and property damage claims, along with employees’ health insurance with varying risk retention levels. We maintain insurance coverage for per-incident and total losses in excess of these risk retention levels in amounts we consider adequate based upon historical experience and our ongoing review. However, we could suffer a series of losses within our self-insured retention limits or losses over our policy limits, which could negatively affect our financial condition and operating results. We are responsible for the first $1.0 million on each auto liability claim and for the first $750,000 on each workers’ compensation claim. We have $10.4 million in standby letters of credit to guarantee settlement of claims under agreements with our insurance carriers and regulatory authorities. The insurance and claims accruals in our consolidated balance sheets were $16.2 million as of December 31, 2015 and $14.0 million as of December 31, 2014. We reserve currently for the estimated cost of the uninsured portion of pending claims. We periodically evaluate and adjust these reserves based on our evaluation of the nature and severity of outstanding individual claims and our estimate of future claims development based on historical development. Actual results could differ from these current estimates. In addition, to the extent that claims are litigated and not settled, jury awards are difficult to predict.

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Share-based Payment Arrangement Compensation. We have granted stock options to certain employees and non-employee directors. We recognize compensation expense for all stock options net of an estimated forfeiture rate and only record compensation expense for those shares expected to vest on a straight-line basis over the requisite service period (normally the vesting period). Determining the appropriate fair value model and calculating the fair value of stock options require the input of highly subjective assumptions, including the expected life of the stock options and stock price volatility. We use the Black-Scholes model to value our stock option awards. We believe that future volatility will not materially differ from our historical volatility. Thus, we use the historical volatility of our common stock over the expected life of the award. The assumptions used in calculating the fair value of stock options represent our best estimates, but these estimates involve inherent uncertainties and the application of judgment. As a result, if factors change and we use different assumptions, stock option compensation expense could be materially different in the future.

We have also granted performance unit awards to certain employees which are subject to vesting requirements over a five-year period, primarily based on our earnings growth. The fair value of each performance unit is based on the closing market price on the date of grant. We recognize compensation expense for these awards based on the estimated number of units probable of achieving the performance and service vesting requirements of the awards, net of an estimated forfeiture rate.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers” which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The standard, which is effective for the first quarter of 2018, will replace most existing revenue recognition guidance required by U.S. generally accepted accounting principles. The adoption of this standard is not expected to have a significant impact on our consolidated balance sheets, statements of operations or statements of cash flows.

In February 2016, the FASB issued Accounting Standards Update No. 2016-02, “Leases” which requires organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The new guidance also requires additional disclosures related to leasing transactions. The standard is effective for the first quarter of 2019. The adoption of this standard is not expected to have a significant impact on our consolidated balance sheets, statements of operations or statements of cash flows.

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ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to a variety of market risks, most importantly the effects of the price and availability of diesel fuel. We require substantial amounts of diesel fuel to operate our tractors and power the temperature-control units on our trailers. The price and availability of diesel fuel can vary, and are subject to political, economic and market factors that are beyond our control. Significant increases in diesel fuel costs could materially and adversely affect our results of operations and financial condition. Based upon our fuel consumption in 2015, a 5% increase in the average cost of diesel fuel would have increased our fuel expense by $5.1 million.

We have historically been able to pass through a significant portion of long-term increases in diesel fuel prices and related taxes to customers in the form of fuel surcharges. Fuel surcharge programs are widely accepted among our customers, though they can vary somewhat from customer-to-customer. These fuel surcharges, which adjust weekly with the cost of fuel, enable us to recover a substantial portion of the higher cost of fuel as prices increase. These fuel surcharge provisions are not effective in mitigating the fuel price increases related to non-revenue miles or fuel used while the tractor is idling. In addition, we have worked diligently to control fuel usage and costs by improving our volume purchasing arrangements and optimizing our drivers’ fuel purchases with national fuel centers, focusing on shorter lengths of haul, installing and tightly managing the use of auxiliary power units in our tractors to minimize engine idling and improving fuel usage in our trailers’ refrigeration units.

While we do not currently have any outstanding hedging instruments to mitigate this market risk, we may enter into derivatives or other financial instruments to hedge a portion of our fuel costs in the future.

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Management’s Annual Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining an adequate system of internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended, for Marten Transport, Ltd. and subsidiaries (the “Company”). This system is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. generally accepted accounting principles.

The Company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the Company; (ii) 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 (iii) 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 and even when determined to be effective, can only provide reasonable assurance with respect to financial statement preparation and presentation. Also, projection of any evaluation of the effectiveness of internal control over financial reporting to future periods is subject to the risk that controls may become inadequate because of changes in conditions, or that the degree or compliance with the policies or procedures may deteriorate.

Management, with the participation of the Company’s Chairman of the Board and Chief Executive Officer and Executive Vice President and Chief Financial Officer, evaluated the effectiveness of the Company’s internal control over financial reporting as of December 31, 2015. In making this evaluation, management used the criteria established in the 2013 Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, management concluded that the Company’s internal control over financial reporting was effective as of December 31, 2015. Further, the Company’s independent registered public accounting firm, Grant Thornton LLP, has issued a report on the Company’s internal controls over financial reporting on page 37 of this Report.

March 11, 2016

36

Report of Independent Registered Public Accounting Firm

Board of Directors and Shareholders

Marten Transport, Ltd.

We have audited the internal control over financial reporting of Marten Transport, Ltd. (a Delaware corporation) and subsidiaries (the “Company”) as of December 31, 2015, based on criteria established in the 2013 Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). 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. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). 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.

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.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, 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), the consolidated financial statements of the Company as of and for the year ended December 31, 2015, and our report dated March 11, 2016 expressed an unqualified opinion on those financial statements.

/s/ GRANT THORNTON LLP

Minneapolis, Minnesota

March 11, 2016

37

Repo rt of Independent Registered Public Accounting Firm

Board of Directors and Shareholders

Marten Transport, Ltd.

We have audited the accompanying consolidated balance sheets of Marten Transport, Ltd. (a Delaware corporation) and subsidiaries (the “Company”) as of December 31, 2015 and 2014, and the related consolidated statements of operations, stockholders’ equity, and cash flows for the years then ended. Our audits of the basic consolidated financial statements included the financial statement schedule for the years ended December 31, 2015 and 2014 listed in the index appearing under Item 15. These financial statements and financial statement schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements and financial statement schedule based on our audits.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Marten Transport, Ltd. and subsidiaries as of December 31, 2015 and 2014, and the results of their operations and their cash flows for the years then ended in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the related financial statement schedule, when considered in relation to the basic consolidated financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.

As discussed in Note 18 to the consolidated financial statements, the Company adopted new accounting guidance in 2015 and 2014, related to the presentation of deferred income taxes.

We also have audited the adjustments to the 2013 consolidated financial statements to retrospectively apply the change in reportable segment disclosures, as described in Note 17 to the consolidated financial statements. In our opinion, such adjustments are appropriate and have been properly applied. We were not engaged to audit, review, or apply any procedures to the 2013 consolidated financial statements of the Company other than with respect to such adjustments and, accordingly, we do not express an opinion or any other form of assurance on the 2013 financial statements taken as a whole.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of December 31, 2015, 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 March 11, 2016 expressed an unqualified opinion thereon.

/s/ GRANT THORNTON LLP

Minneapolis, Minnesota

March 11, 2016

38

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

Marten Transport, Ltd:

We have audited, before the effects of the retrospective adjustments to the disclosures for a change in the composition of reportable segments discussed in Note 17 to the consolidated financial statements, the accompanying consolidated statements of operations, stockholders’ equity and cash flows of Marten Transport, Ltd. and subsidiaries (the Company) for the year ended December 31, 2013 (the 2013 consolidated financial statements before the effects of the adjustments discussed in Note 17 to the consolidated financial statements are not presented herein). In connection with our audit of the 2013 consolidated financial statements, we also have audited the related information in financial statement Schedule II listed in Item 15(a)(2). These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion.

In our opinion, such 2013 financial statements, before the effects of the retrospective adjustments to the disclosures for a change in the composition of reportable segments discussed in Note 17 to the consolidated financial statements, present fairly, in all material respects, the results of operations and cash flows of Marten Transport, Ltd. and subsidiaries for the year ended December 31, 2013 in conformity with accounting principles generally accepted in the United States of America.

We were not engaged to audit, review, or apply any procedures to the retrospective adjustments to the disclosures for a change in the composition of reportable segments discussed in Note 17 to the consolidated financial statements and, accordingly, we do not express an opinion or any other form of assurance about whether such retrospective adjustments are appropriate and have been properly applied. Those adjustments were audited by other auditors.

/s/ KPMG LLP

Minneapolis, Minnesota

March 12, 2014

39

MARTEN TRANSPORT, LTD.

Consolidated Balance Sheets

|  | December 31, |
(In thousands, except share information) |  | 2015 |  |  | 2014 |
ASSETS |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 434 |  |  | $ | 123 |
Receivables: |  |  |  |  |  |  |  |
Trade, less allowances of $305 and $475, respectively |  |  | 70,597 |  |  |  | 72,263 |
Other |  |  | 10,885 |  |  |  | 17,740 |
Prepaid expenses and other |  |  | 18,134 |  |  |  | 16,860 |
Total current assets |  |  | 100,050 |  |  |  | 106,986 |
Property and equipment: |  |  |  |  |  |  |  |
Revenue equipment |  |  | 606,144 |  |  |  | 535,091 |
Buildings and land |  |  | 73,159 |  |  |  | 71,105 |
Office equipment and other |  |  | 45,294 |  |  |  | 39,776 |
Less accumulated depreciation |  |  | (196,588 | ) |  |  | (180,223 | )
Net property and equipment |  |  | 528,009 |  |  |  | 465,749 |
Other assets |  |  | 3,469 |  |  |  | 3,726 |
|  | $ | 631,528 |  |  | $ | 576,461 |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Accounts payable |  | $ | 12,007 |  |  | $ | 17,065 |
Insurance and claims accruals |  |  | 16,235 |  |  |  | 13,998 |
Accrued liabilities |  |  | 21,634 |  |  |  | 12,710 |
Checks issued in excess of cash balances |  |  | — |  |  |  | 745 |
Total current liabilities |  |  | 49,876 |  |  |  | 44,518 |
Long-term debt |  |  | 37,867 |  |  |  | 24,373 |
Deferred income taxes |  |  | 134,364 |  |  |  | 119,644 |
Total liabilities |  |  | 222,107 |  |  |  | 188,535 |
Commitments and contingencies (Note 16) |  |  |  |  |  |  |  |
Stockholders’ equity: |  |  |  |  |  |  |  |
Preferred stock, $.01 par value per share; 2,000,000 shares authorized; no shares issued and outstanding |  |  | — |  |  |  | — |
Common stock, $.01 par value per share; 96,000,000 shares authorized; 32,759,806 shares at December 31, 2015, and 33,418,829 shares at December 31, 2014, issued and outstanding |  |  | 328 |  |  |  | 334 |
Additional paid-in capital |  |  | 76,468 |  |  |  | 87,370 |
Retained earnings |  |  | 332,625 |  |  |  | 300,222 |
Total stockholders’ equity |  |  | 409,421 |  |  |  | 387,926 |
|  | $ | 631,528 |  |  | $ | 576,461 |

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

40

MARTEN TRANSPORT, LTD.

Consolidated Statements of Operations

|  | For the years ended December 31, |
(In thousands, except per share information) |  | 20 15 |  |  | 2014 |  |  | 2013 |
Operating revenue |  | $ | 664,994 |  |  | $ | 672,929 |  |  | $ | 659,214 |
Operating expenses (income): |  |  |  |  |  |  |  |  |  |  |  |
Salaries, wages and benefits |  |  | 209,455 |  |  |  | 183,464 |  |  |  | 171,314 |
Purchased transportation |  |  | 118,030 |  |  |  | 123,017 |  |  |  | 123,436 |
Fuel and fuel taxes |  |  | 104,582 |  |  |  | 153,931 |  |  |  | 163,270 |
Supplies and maintenance |  |  | 43,319 |  |  |  | 41,490 |  |  |  | 40,582 |
Depreciation |  |  | 75,323 |  |  |  | 68,243 |  |  |  | 64,476 |
Operating taxes and licenses |  |  | 8,914 |  |  |  | 7,140 |  |  |  | 7,110 |
Insurance and claims |  |  | 29,252 |  |  |  | 27,240 |  |  |  | 23,681 |
Communications and utilities |  |  | 5,886 |  |  |  | 5,798 |  |  |  | 5,212 |
Gain on disposition of revenue equipment |  |  | (5,584 | ) |  |  | (4,387 | ) |  |  | (5,972 | )
Gain on disposition of facilities |  |  | (4,104 | ) |  |  | — |  |  |  | — |
Other |  |  | 18,858 |  |  |  | 15,987 |  |  |  | 14,110 |
|  |  | 603,931 |  |  |  | 621,923 |  |  |  | 607,219 |
Operating income |  |  | 61,063 |  |  |  | 51,006 |  |  |  | 51,995 |
Other |  |  | 372 |  |  |  | (667 | ) |  |  | (392 | )
Income before income taxes |  |  | 60,691 |  |  |  | 51,673 |  |  |  | 52,387 |
Less: Income before income taxes attributable to noncontrolling interest |  |  | — |  |  |  | — |  |  |  | 84 |
Income before income taxes attributable to Marten Transport, Ltd. |  |  | 60,691 |  |  |  | 51,673 |  |  |  | 52,303 |
Provision for income taxes |  |  | 24,946 |  |  |  | 21,839 |  |  |  | 22,156 |
Net income |  | $ | 35,745 |  |  | $ | 29,834 |  |  | $ | 30,147 |
Basic earnings per common share |  | $ | 1.07 |  |  | $ | 0.89 |  |  | $ | 0.91 |
Diluted earnings per common share |  | $ | 1.06 |  |  | $ | 0.89 |  |  | $ | 0.90 |
Dividends declared per common share |  | $ | 0.10 |  |  | $ | 0.10 |  |  | $ | 0.083 |

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

41

MARTEN TRANSPORT, LTD.

Consolidated Statements o f Stockholders’ Equity

|  | Marten Transport, Ltd. Stockholders |  |  |  |  |  |  |  |  |
|  | Common Stock |  |  | Additional |  |  | Retained |  |  | Non- controlling |  |  | Total Stockholders’ |
(In thousands) |  | Shares |  |  | Amount |  |  | Paid-In Capital |  |  | Earnings |  |  | Interest |  |  | Equity |
Balance at December 31, 2012 |  |  | 33,164 |  |  | $ | 332 |  |  | $ | 82,679 |  |  | $ | 246,349 |  |  | $ | 2,563 |  |  | $ | 331,923 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 30,147 |  |  |  | — |  |  |  | 30,147 |
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards |  |  | 137 |  |  |  | 1 |  |  |  | 1,125 |  |  |  | — |  |  |  | — |  |  |  | 1,126 |
Tax benefits from share-based payment arrangement exercises |  |  | — |  |  |  | — |  |  |  | 189 |  |  |  | — |  |  |  | — |  |  |  | 189 |
Share-based payment arrangement compensation expense |  |  | — |  |  |  | — |  |  |  | 1,084 |  |  |  | — |  |  |  | — |  |  |  | 1,084 |
Dividends on common stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,769 | ) |  |  | — |  |  |  | (2,769 | )
Income before income taxes attributable to noncontrolling interest |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 84 |  |  |  | 84 |
Noncontrolling interest distributions |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (84 | ) |  |  | (84 | )
Change to equity method of accounting |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,563 | ) |  |  | (2,563 | )
Balance at December 31, 2013 |  |  | 33,301 |  |  |  | 333 |  |  |  | 85,077 |  |  |  | 273,727 |  |  |  | — |  |  |  | 359,137 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 29,834 |  |  |  | — |  |  |  | 29,834 |
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards |  |  | 118 |  |  |  | 1 |  |  |  | 1,213 |  |  |  | — |  |  |  | — |  |  |  | 1,214 |
Tax benefits from share-based payment arrangement exercises |  |  | — |  |  |  | — |  |  |  | 159 |  |  |  | — |  |  |  | — |  |  |  | 159 |
Share-based payment arrangement compensation expense |  |  | — |  |  |  | — |  |  |  | 921 |  |  |  | — |  |  |  | — |  |  |  | 921 |
Dividends on common stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,339 | ) |  |  | — |  |  |  | (3,339 | )
Balance at December 31, 2014 |  |  | 33,419 |  |  |  | 334 |  |  |  | 87,370 |  |  |  | 300,222 |  |  |  | — |  |  |  | 387,926 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 35,745 |  |  |  | — |  |  |  | 35,745 |
Repurchase and retirement of common stock |  |  | (941 | ) |  |  | (9 | ) |  |  | (16,166 | ) |  |  | — |  |  |  | — |  |  |  | (16,175 | )
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards |  |  | 282 |  |  |  | 3 |  |  |  | 3,487 |  |  |  | — |  |  |  | — |  |  |  | 3,490 |
Tax benefits from share-based payment arrangement exercises |  |  | — |  |  |  | — |  |  |  | 373 |  |  |  | — |  |  |  | — |  |  |  | 373 |
Share-based payment arrangement compensation expense |  |  | — |  |  |  | — |  |  |  | 1,404 |  |  |  | — |  |  |  | — |  |  |  | 1,404 |
Dividends on common stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,342 | ) |  |  | — |  |  |  | (3,342 | )
Balance at December 31, 2015 |  |  | 32,760 |  |  | $ | 328 |  |  | $ | 76,468 |  |  | $ | 332,625 |  |  | $ | — |  |  | $ | 409,421 |

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

42

MARTEN TRANSPORT, LTD.

Consolidated Statements of Cash Flows

|  | For the years ended December 31, |
(In thousands) |  | 20 15 |  |  | 2014 |  |  | 2013 |
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |
Operations: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 35,745 |  |  | $ | 29,834 |  |  | $ | 30,147 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  | 75,323 |  |  |  | 68,243 |  |  |  | 64,476 |
Gain on disposition of revenue equipment |  |  | (5,584 | ) |  |  | (4,387 | ) |  |  | (5,972 | )
Gain on disposition of facilities |  |  | (4,104 | ) |  |  | - |  |  |  | - |
Deferred income taxes |  |  | 14,720 |  |  |  | 9,422 |  |  |  | 4,303 |
Tax benefits from share-based payment arrangement exercises |  |  | 373 |  |  |  | 159 |  |  |  | 189 |
Excess tax benefits from share-based payment arrangement exercises |  |  | (432 | ) |  |  | (115 | ) |  |  | (165 | )
Share-based payment arrangement compensation expense |  |  | 1,404 |  |  |  | 921 |  |  |  | 1,084 |
Equity in loss (earnings) from affiliate |  |  | 296 |  |  |  | (246 | ) |  |  | (111 | )
Income before income taxes attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |
Changes in other current operating items: |  |  | - |  |  |  | - |  |  |  | 84 |
Receivables |  |  | 7,968 |  |  |  | (14,913 | ) |  |  | (6,478 | )
Prepaid expenses and other |  |  | (1,274 | ) |  |  | (1,586 | ) |  |  | (25 | )
Accounts payable |  |  | (4,853 | ) |  |  | (723 | ) |  |  | 2,387 |
Insurance and claims accruals |  |  | 2,237 |  |  |  | (406 | ) |  |  | 566 |
Accrued liabilities |  |  | 6,419 |  |  |  | (4,232 | ) |  |  | (1,298 | )
Net cash provided by operating activities |  |  | 128,238 |  |  |  | 81,971 |  |  |  | 89,187 |
CASH FLOWS USED FOR INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |
Revenue equipment additions |  |  | (174,165 | ) |  |  | (131,645 | ) |  |  | (102,808 | )
Proceeds from revenue equipment dispositions |  |  | 56,011 |  |  |  | 43,933 |  |  |  | 48,048 |
Buildings and land, office equipment and other additions |  |  | (13,482 | ) |  |  | (30,885 | ) |  |  | (18,031 | )
Proceeds from buildings and land, office equipment and other dispositions |  |  | 6,594 |  |  |  | 28 |  |  |  | 28 |
Decrease in cash and cash equivalents resulting from change to equity method of accounting |  |  | - |  |  |  | - |  |  |  | (1,924 | )
Other |  |  | (39 | ) |  |  | (37 | ) |  |  | (35 | )
Net cash used for investing activities |  |  | (125,081 | ) |  |  | (118,606 | ) |  |  | (74,722 | )
CASH FLOWS (USED FOR) PROVIDED BY FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under credit facility and long-term debt |  |  | 141,908 |  |  |  | 168,444 |  |  |  | 82,697 |
Repayment of borrowings under credit facility and long-term debt |  |  | (128,414 | ) |  |  | (144,071 | ) |  |  | (85,423 | )
Repurchase and retirement of common stock |  |  | (16,175 | ) |  |  | - |  |  |  | - |
Dividends on common stock |  |  | (3,342 | ) |  |  | (3,339 | ) |  |  | (2,769 | )
Issuance of common stock from share-based payment arrangement exercises |  |  | 3,490 |  |  |  | 1,214 |  |  |  | 1,126 |
Change in checks issued in excess of cash balances |  |  | (745 | ) |  |  | 745 |  |  |  | - |
Excess tax benefits from share-based payment arrangement exercises |  |  | 432 |  |  |  | 115 |  |  |  | 165 |
Noncontrolling interest distributions |  |  | - |  |  |  | - |  |  |  | (84 | )
Net cash (used for) provided by financing activities |  |  | (2,846 | ) |  |  | 23,108 |  |  |  | (4,288 | )
NET CHANGE IN CASH AND CASH EQUIVALENTS |  |  | 311 |  |  |  | (13,527 | ) |  |  | 10,177 |
CASH AND CASH EQUIVALENTS: |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 123 |  |  |  | 13,650 |  |  |  | 3,473 |
End of year |  | $ | 434 |  |  | $ | 123 |  |  | $ | 13,650 |
SUPPLEMENTAL NON-CASH DISCLOSURE: |  |  |  |  |  |  |  |  |  |  |  |
Change in property and equipment not yet paid |  | $ | 2,853 |  |  | $ | (3,973 | ) |  | $ | 6,644 |
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for: |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  | $ | 2,121 |  |  | $ | 26,766 |  |  | $ | 16,190 |
Interest |  | $ | 252 |  |  | $ | 179 |  |  | $ | 97 |

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

43

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements

December 31, 2015, 2014 and 2013

1. Summary of Significant Accounting Policies

Nature of business: Marten Transport, Ltd. is one of the leading temperature-sensitive truckload carriers in the United States. We specialize in transporting and distributing food and other consumer packaged goods that require a temperature-controlled or insulated environment for customers in the United States, Canada and Mexico.

Principles of consolidation: The accompanying consolidated financial statements include the accounts of Marten Transport, Ltd., its subsidiaries and, through March 27, 2013, its 45% owned affiliate, MW Logistics, LLC (“MWL”). As of March 28, 2013, Marten Transport deconsolidated MWL (See Note 12).

Cash and cash equivalents: Cash in excess of current operating requirements is invested in short-term, highly liquid investments. We consider all highly liquid investments purchased with original maturities of three months or less to be cash equivalents. Changes in accounts at banks with an aggregate excess of the amount of checks issued over cash balances are included as a financing activity in the accompanying consolidated statements of cash flows.

Trade accounts receivable: Trade accounts receivable are recorded at the invoiced amounts, net of an allowance for doubtful accounts. A considerable amount of judgment is required in assessing the realization of these receivables including the current creditworthiness of each customer and related aging of the past-due balances, including any billing disputes. In order to assess the collectibility of these receivables, we perform ongoing credit evaluations of our customers’ financial condition. Through these evaluations, we may become aware of a situation where a customer may not be able to meet its financial obligations due to deterioration of its financial viability, credit ratings or bankruptcy. The allowance for doubtful accounts is based on the best information available to us and is reevaluated and adjusted as additional information is received. We evaluate the allowance based on historical write-off experience, the size of the individual customer balances, past-due amounts and the overall national economy. We review the adequacy of our allowance for doubtful accounts monthly. Invoice balances over 30 days after the contractual due date are considered past due per our policy and are reviewed individually for collectibility. Initial payments by new customers are monitored for compliance with contractual terms. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential recovery is considered remote.

Property and equipment: Additions and improvements to property and equipment are capitalized at cost. Maintenance and repair expenditures are charged to operations. Gains and losses on disposals of revenue equipment are included in operations as they are a normal, recurring component of our operations.

Depreciation is computed based on the cost of the asset, reduced by its estimated salvage value, using the straight-line method for financial reporting purposes. We begin depreciating assets in the month that each asset is placed in service and, therefore, is ready for its intended use, and depreciate each asset until it is taken out of service and available for sale. Accelerated methods are used for income tax reporting purposes. Following is a summary of estimated useful lives for financial reporting purposes:

|  | Years |
Tractors |  |  | 5 |  |
Trailers |  |  | 7 |  |
Service and other equipment |  | 3 | - | 15 |
Buildings and improvements |  | 20 | - | 40 |

44

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

In 2015, we replaced our company-owned tractors within an average of 4.1 years and our trailers within an average of 5.1 years after purchase. Our useful lives for depreciating tractors is five years and for trailers is seven years, with a 25% salvage value for tractors and a 35% salvage value for trailers. These salvage values are based upon the expected market values of the equipment after five years for tractors and seven years for trailers. Depreciation expense calculated in this manner approximates the continuing declining value of the revenue equipment, and continues at a consistent straight-line rate for units held beyond the normal replacement cycle.

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future net undiscounted cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the costs to sell.

Tires in service: The cost of original equipment and replacement tires placed in service is capitalized. Amortization is calculated based on cost, less estimated salvage value, using the straight-line method over 24 months. Tire amortization, which is included within supplies and maintenance in our consolidated statements of operations, was $6.3 million in 2015, $5.7 million in 2014 and $5.8 million in 2013. The current portion of capitalized tires in service is included in prepaid expenses and other in the accompanying consolidated balance sheets. The long-term portion of capitalized tires in service and the estimated salvage value are included in revenue equipment in the accompanying consolidated balance sheets. The cost of recapping tires is charged to operations as incurred.

Income taxes: Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. We have reflected the necessary deferred tax assets and liabilities in the accompanying consolidated balance sheets. We believe the future tax deductions will be realized principally through future reversals of existing taxable temporary differences and future taxable income.

In the ordinary course of business there is inherent uncertainty in quantifying our income tax positions. We assess our income tax positions and record tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting dates. For those tax positions where it is more-likely-than-not that a tax benefit will be sustained, we have recorded the largest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more-likely-than-not that a tax benefit will be sustained, no tax benefit has been recognized in the financial statements. Potential accrued interest and penalties related to unrecognized tax benefits are recognized as a component of income tax expense.

Insurance and claims: We self-insure, in part, for losses relating to workers’ compensation, auto liability, general liability, cargo, and property damage claims, along with employees’ health insurance with varying risk retention levels. We are responsible for the first $1.0 million on each auto liability claim. We are also responsible for the first $750,000 on each workers’ compensation claim. We maintain insurance coverage for per-incident and total losses in excess of these risk retention levels in amounts we consider adequate based upon historical experience and our ongoing review. We reserve currently for the estimated cost of the uninsured portion of pending claims, including legal costs. These reserves are periodically evaluated and adjusted based on our evaluation of the nature and severity of outstanding individual claims and an estimate of future claims development based on historical development. Under agreements with our insurance carriers and regulatory authorities, we have $10.4 million in standby letters of credit to guarantee settlement of claims.

45

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

Revenue recognition: We record revenue and related expenses on the date shipment of freight is completed. Our largest customer, Wal-Mart, accounted for 13% of our revenue in 2015 and 12% of our trade receivables as of December 31, 2015. Our largest customer accounted for 9% of our revenue in 2014 and 8% of our revenue in 2013. During each of 2015, 2014 and 2013, approximately 99% of our revenue was generated within the United States.

We account for revenue of our Intermodal and Brokerage segments and revenue on freight transported by independent contractors within our Truckload and Dedicated segments on a gross basis because we are the primary obligor in the arrangements, we have the ability to establish prices, we have the risk of loss in the event of cargo claims and we bear credit risk with customer payments. Accordingly, all such revenue billed to customers is classified as operating revenue and all corresponding payments to carriers for transportation services we arrange in connection with brokerage and intermodal activities and to independent contractor providers of revenue equipment are classified as purchased transportation expense.

Share-based payment arrangement compensation: Under our stock incentive plans, all of our employees and any subsidiary employees, as well as all of our non-employee directors, may be granted stock-based awards, including incentive and non-statutory stock options and performance unit awards. We account for share-based payment arrangements in accordance with FASB ASC 718, Compensation-Stock Compensation, which requires all share-based payments to employees and non-employee directors, including grants of employee stock options and performance unit awards, to be recognized in the income statement based on their fair values at the date of grant.

Earnings per common share: Basic earnings per common share is computed by dividing net income by the weighted average number of common shares outstanding during the year. Diluted earnings per common share is computed by dividing net income by the sum of the weighted average number of common shares outstanding plus all additional common shares that would have been outstanding if potentially dilutive common shares related to stock options and performance unit awards had been issued using the treasury stock method.

Segment reporting: We report our operating segments in accordance with accounting standards codified in FASB ASC 280, Segment Reporting. We have six current operating segments that, beginning with fiscal 2014, have been aggregated into four reporting segments (Truckload, Dedicated, Intermodal and Brokerage) for financial reporting purposes. See Note 17 for more information.

Use of estimates: We must make estimates and assumptions to prepare the consolidated financial statements in conformity with U.S. generally accepted accounting principles. These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities in the consolidated financial statements and the reported amount of revenue and expenses during the reporting period. These estimates are primarily related to insurance and claims accruals and depreciation. Ultimate results could differ from these estimates.

Recent accounting pronouncements: In May 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers” which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The standard, which is effective for the first quarter of 2018, will replace most existing revenue recognition guidance required by U.S. generally accepted accounting principles. The adoption of this standard is not expected to have a significant impact on our consolidated balance sheets, statements of operations or statements of cash flows.

46

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

In February 2016, the FASB issued Accounting Standards Update No. 2016-02, “Leases” which requires organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The new guidance also requires additional disclosures related to leasing transactions. The standard is effective for the first quarter of 2019. The adoption of this standard is not expected to have a significant impact on our consolidated balance sheets, statements of operations or statements of cash flows.

2. Details of Consolidated Balance Sheet Accounts

Prepaid expenses and other: As of December 31, prepaid expenses and other consisted of the following:

(In thousands) |  | 20 15 |  |  | 2014 |
Tires in service |  | $ | 5,064 |  |  | $ | 4,438 |
License fees |  |  | 4,921 |  |  |  | 4,397 |
Parts and tires inventory |  |  | 4,011 |  |  |  | 3,754 |
Insurance premiums |  |  | 1,730 |  |  |  | 1,537 |
Other |  |  | 2,408 |  |  |  | 2,734 |
|  | $ | 18,134 |  |  | $ | 16,860 |

Accrued liabilities: As of December 31, accrued liabilities consisted of the following:

(In thousands) |  | 2015 |  |  | 2014 |
Accrued expenses |  | $ | 7,940 |  |  | $ | 5,536 |
Vacation |  |  | 4,782 |  |  |  | 4,301 |
Accrued liability to MWL |  |  | 4,284 |  |  |  | 466 |
Salaries and wages |  |  | 2,644 |  |  |  | 1,204 |
Other |  |  | 1,984 |  |  |  | 1,203 |
|  | $ | 21,634 |  |  | $ | 12,710 |

3. Long-Term Debt

We maintain a credit agreement that provides for an unsecured committed credit facility which matures in December 2019. In November 2015, we entered into an amendment to the facility which increased the aggregate principal amount of the facility from $50.0 million to $75.0 million. At December 31, 2015, there was an outstanding principal balance of $37.9 million on the facility. As of that date, we had outstanding standby letters of credit of $10.4 million and remaining borrowing availability of $26.7 million. At December 31, 2014, there was an outstanding principal balance of $24.4 million on the facility. This facility bears interest at a variable rate based on the London Interbank Offered Rate or the lender’s Prime Rate, in each case plus/minus applicable margins. The weighted average interest rate for the facility was 1.1% at December 31, 2015.

Our credit facility prohibits us from paying, in any fiscal year, stock redemptions and dividends in excess of 25% of our net income from the prior fiscal year. A waiver of the 25% limitation for 2015 and 2016, should it apply, was obtained from the lender. This facility also contains restrictive covenants which, among other matters, require us to maintain compliance with cash flow leverage and fixed charge coverage ratios. We were in compliance with all covenants at December 31, 2015 and December 31, 2014.

47

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

4. Related Party Transactions

The following related party transactions occurred during the three years ended December 31, 2015;

(a) We purchase fuel and tires and obtain related services from a company in which one of our directors is the chairman of the board, chief executive officer and the principal stockholder. We paid that company $335,000 in 2015, $562,000 in 2014 and $585,000 in 2013 for fuel, tires and related services. In addition, we paid $1.5 million in 2015, $1.4 million in 2014 and $1.6 million in 2013 to tire manufacturers for tires that were provided by the same company. The same company received commissions from the tire manufacturers related to these purchases. We did not have any accounts payable to that company as of December 31, 2015, and did have $19,000 of payables to that company as of December 31, 2014.

(b) We provide transportation services to MWL as described in Note 12.

5. Income Taxes

The components of the provision for income taxes consisted of the following:

(In thousands) |  | 201 5 |  |  | 2014 |  |  | 2013 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 9,280 |  |  | $ | 10,402 |  |  | $ | 15,964 |
State |  |  | 946 |  |  |  | 2,015 |  |  |  | 1,889 |
|  |  | 10,226 |  |  |  | 12,417 |  |  |  | 17,853 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 13,042 |  |  |  | 8,648 |  |  |  | 3,909 |
State |  |  | 1,678 |  |  |  | 774 |  |  |  | 394 |
|  |  | 14,720 |  |  |  | 9,422 |  |  |  | 4,303 |
Total provision |  | $ | 24,946 |  |  | $ | 21,839 |  |  | $ | 22,156 |

The statutory federal income tax rate is reconciled to the effective income tax rate as follows:

|  | 2015 |  |  | 2014 |  |  | 2013 |
Statutory federal income tax rate |  |  | 35 | % |  |  | 35 | % |  |  | 35 | %
Per diem and other non-deductible expenses |  |  | 3 |  |  |  | 4 |  |  |  | 4 |
Increase in taxes arising from state income taxes, net of federal income tax benefit |  |  | 3 |  |  |  | 3 |  |  |  | 3 |
Effective tax rate |  |  | 41 | % |  |  | 42 | % |  |  | 42 | %

48

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

As of December 31, the net deferred tax liability consisted of the following:

(In thousands) |  | 201 5 |  |  | 2014 |
Deferred tax assets: |  |  |  |  |  |  |  |
Reserves and accrued liabilities |  | $ | 7,219 |  |  | $ | 6,049 |
Other |  |  | 2,721 |  |  |  | 2,847 |
|  |  | 9,940 |  |  |  | 8,896 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Depreciation |  |  | 141,255 |  |  |  | 125,697 |
Prepaid expenses |  |  | 3,049 |  |  |  | 2,843 |
|  |  | 144,304 |  |  |  | 128,540 |
Net deferred tax liability |  | $ | 134,364 |  |  | $ | 119,644 |

We have not provided a valuation allowance against deferred tax assets at December 31, 2015 or 2014. We believe the deferred tax assets will be realized principally through future reversals of existing taxable temporary differences (deferred tax liabilities) and future taxable income.

Our reserves for unrecognized tax benefits were $683,000 as of December 31, 2015 and $562,000 as of December 31, 2014. The $121,000 increase in the amount reserved in 2015 relates to current period tax positions offset by the removal of the reserve relating to 2010 tax positions. The amount reserved as of December 31, 2014 was added in 2010 through 2014 relating to current period tax positions. If recognized, $470,000 of the unrecognized tax benefits as of December 31, 2015 would impact our effective tax rate. Potential interest and penalties related to unrecognized tax benefits of $91,000 were recognized in our financial statements as of December 31, 2015, and of $72,000 were recorded as of December 31, 2014. We do not expect the reserves for unrecognized tax benefits to change significantly within the next twelve months.

The federal statute of limitations remains open for 2012 and forward. We file tax returns in numerous state jurisdictions with varying statutes of limitations.

6. Earnings p er Common Share

Basic and diluted earnings per common share were computed as follows:

(In thousands, except per share amounts) |  | 20 15 |  |  | 2014 |  |  | 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 35,745 |  |  | $ | 29,834 |  |  | $ | 30,147 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share - weighted-average shares |  |  | 33,477 |  |  |  | 33,381 |  |  |  | 33,221 |
Effect of dilutive stock options |  |  | 238 |  |  |  | 297 |  |  |  | 208 |
Diluted earnings per common share - weighted-average shares and assumed conversions |  |  | 33,715 |  |  |  | 33,678 |  |  |  | 33,429 |
Basic earnings per common share |  | $ | 1.07 |  |  | $ | 0.89 |  |  | $ | 0.91 |
Diluted earnings per common share |  | $ | 1.06 |  |  | $ | 0.89 |  |  | $ | 0.90 |

Options totaling 325,400, 176,500 and 304,600 equivalent shares were outstanding but were not included in the calculation of diluted earnings per share for 2015, 2014 and 2013, respectively, because including the options in the denominator would be antidilutive, or decrease the number of weighted-average shares, due to their exercise prices exceeding the average market price of the common shares, or because inclusion of average unrecognized compensation expense in the calculation would cause the options to be antidilutive.

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MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

Unvested performance unit awards (see Note 13) totaling 69,655, 39,885 and 47,636 equivalent shares for 2015, 2014 and 2013, respectively, were considered outstanding but were not included in the calculation of diluted earnings per share because inclusion of average unrecognized compensation expense in the calculation would cause the performance units to be antidilutive.

7. Share Repurchase Program

In December 2007, our Board of Directors approved and we announced a share repurchase program to repurchase up to one million shares of our common stock either through purchases on the open market or through private transactions and in accordance with Rule 10b-18 of the Exchange Act. On November 4, 2015, our Board of Directors approved and we announced an increase in the share repurchase program, providing for the repurchase of up to $40 million, or approximately 2 million shares, of our common stock. The timing and extent to which we repurchase shares depends on market conditions and other corporate considerations. The repurchase program does not have an expiration date.

In the fourth quarter of 2015 we repurchased and retired 941,024 shares of our common stock for $16.2 million.

8. Dividends

In 2010, we announced that our Board of Directors approved a regular cash dividend program to our stockholders, subject to approval each quarter. Quarterly cash dividends of $0.025 per share of common stock were declared in each quarter of 2015 and 2014 and totaled $3.3 million annually for each of 2015 and 2014. Quarterly cash dividends of $0.017 per share were declared in each of the first and second quarters of 2013, and of $0.025 per share were declared in each of the third and fourth quarters of 2013, totaling $2.8 million. Our ability to pay cash dividends is currently limited by restrictions contained in our revolving credit facility, which prohibits us from paying, in any fiscal year, stock redemptions and dividends in excess of 25% of our net income from the prior fiscal year. A waiver of the 25% limitation for 2015 and 2016, should it apply, was obtained from the lender.

9. Stock Split

On June 14, 2013, we effected a three-for-two stock split of our common stock, $.01 par value, in the form of a 50% stock dividend. Our consolidated financial statements, related notes, and other financial data contained in this report have been adjusted to give retroactive effect to the stock split for all periods presented.

10. 2015 Equity Incentive Plan

In May 2015, our stockholders approved our 2015 Equity Incentive Plan (the “2015 Plan”). Our Board of Directors adopted the 2015 Plan in March 2015. Under the 2015 Plan, all of our employees and any subsidiary employees, as well as all of our non-employee directors, may be granted stock-based awards, including non-statutory stock options, performance unit awards and shares of common stock, of which 212,500 shares have been awarded as of December 31, 2015. The maximum number of shares of common stock available for issuance under the 2015 Plan is 800,000 shares. The 2015 Plan replaces our 2005 Stock Incentive Plan (the “2005 Plan”), which expired by its terms in May 2015. Any awards issued under the 2005 Plan that remain outstanding will continue according to their terms.

11. Amendment to Amended and Restated Certificate of Incorporation

In May 2015, our stockholders approved an amendment to our Amended and Restated Certificate of Incorporation increasing the authorized number of shares of common stock, $.01 par value per share, from 48,000,000 shares to 96,000,000 shares.

50

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

12. Equity Investment

We own a 45% equity interest in MWL, a third-party provider of logistics services to the transportation industry. A non-related party owns the other 55% equity interest in MWL. Pursuant to the guidance in the Variable Interest Entities (VIE) Subsections of FASB ASC 810, Consolidation, we included the accounts of MWL in our consolidated financial statements from April 1, 2004 to March 27, 2013, as we were deemed to be the entity’s primary beneficiary. On March 28, 2013, the other member of MWL made a capital contribution to MWL which triggered a VIE reconsideration event, and it was no longer required to be consolidated as of that date. Accordingly, we deconsolidated MWL and have accounted for our ownership interest in MWL under the equity method of accounting, effective as of March 28, 2013.

Under the deconsolidation accounting guidelines, the investor’s opening investment is recorded at fair value as of the date of deconsolidation. The difference between this initial fair value of the investment and the net carrying value is recognized as a gain or loss in earnings. We completed a valuation analysis and determined that the net carrying value of our equity interest in MWL as of March 28, 2013 of $2.6 million was equal to its fair value and, as such, no gain or loss was recognized upon deconsolidation of MWL. In determining the fair value, we utilized a combination of the income and market approaches, and equally weighed the business enterprise value of MWL provided by each approach. The income approach included the following inputs and assumptions: (a) an expectation regarding the growth of MWL’s revenue at a compounded average growth rate; (b) a perpetual long-term growth rate; and (c) a discount rate that was based on MWL’s estimated weighted average cost of capital. The market approach included a range of multiples of selected comparable companies applied to MWL’s financial metrics for the trailing twelve months in order to obtain an indication of MWL’s business enterprise value on a minority, marketable basis.

Due to the significance of inputs used in determining the fair value of our equity interest in MWL that are unobservable, the investment is classified within Level 3 of the fair value hierarchy that prioritizes from Level 1 to Level 3 the inputs to fair value valuation techniques under the provisions of the accounting guidance for fair value measurements. Fair value measurements using Level 1 inputs provide the most reliable measure of fair value, while Level 3 inputs generally require significant management judgment.

Following the deconsolidation, as an equity method investment, MWL is considered a related party. We received $5.0 million, $8.5 million and $8.2 million of our revenue for loads transported by our tractors and arranged by MWL in 2015, 2014 and 2013, respectively. Prior to deconsolidation effective March 28, 2013, these inter-segment revenues were eliminated in consolidation. Inter-segment revenue eliminated in consolidation was $2.1 million in 2013. As of December 31, 2015, we also had a trade receivable in the amount of $204,000 from MWL and an accrued liability of $4.3 million to MWL for the excess of payments by MWL’s customers into our lockbox account over the amounts drawn on the account by MWL.

13. Employee Benefits

Equity Incentive Plans - In May 2015, our stockholders approved our 2015 Equity Incentive Plan (the “2015 Plan”). Our Board of Directors adopted the 2015 Plan in March 2015. Under our 2015 Plan, all of our employees and any subsidiary employees, as well as all of our non-employee directors, may be granted stock-based awards, including non-statutory stock options and performance unit awards. Stock options expire within 7 or 10 years after the date of grant and the exercise price must be at least the fair market value of our common stock on the date of grant. Stock options issued to employees are generally exercisable beginning one year from the date of grant in cumulative amounts of 20% per year. Performance unit awards are subject to vesting requirements over a five-year period, primarily based on our earnings growth. Options exercised and performance unit award shares issued represent newly issued shares. The maximum number of shares of common stock available for issuance under the 2015 Plan is 800,000 shares. As of December 31, 2015, there were 153,000 shares reserved for issuance under options outstanding and 54,500 shares reserved for issuance under outstanding performance unit awards under the 2015 Plan. The 2015 Plan replaces our 2005 Stock Incentive Plan (the “2005 Plan”), which expired by its terms in May 2015.

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MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

Under the 2005 Plan, officers, directors and employees were granted non-statutory stock options and performance unit awards with similar terms to the options and awards under the 2015 Plan. As of December 31, 2015, there were 697,184 shares reserved for issuance under options outstanding and 137,474 shares reserved for issuance under outstanding performance unit awards under the 2005 Plan. No additional options or awards will be granted under the 2005 Plan.

We use the Black-Scholes option pricing model to calculate the grant-date fair value of option awards. The fair value of service-based option awards granted was estimated as of the date of grant using the following weighted average assumptions:

|  | 20 15 |  |  | 2014 |  |  | 2013 |
Expected option life in years(1) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.1 |
Expected stock price volatility percentage(2) |  |  | 25 | % |  |  | 27 | % |  |  | 33 | %
Risk-free interest rate percentage(3) |  |  | 1.8 | % |  |  | 1.9 | % |  |  | 1.5 | %
Expected dividend yield(4) |  |  | 0.44 | % |  |  | 0.46 | % |  |  | 0.51 | %
Fair value as of the date of grant |  | $ | 5.96 |  |  | $ | 6.25 |  |  | $ | 5.46 |

(1) | Expected option life – We use historical employee exercise and option expiration data to estimate the expected life assumption for the Black-Scholes grant-date valuation. We believe that this historical data is currently the best estimate of the expected term of a new option. We use a weighted-average expected life for all awards.

(2) | Expected stock price volatility – We use our stock’s historical volatility for the same period of time as the expected life. We have no reason to believe that its future volatility will differ from the past.

(3) | Risk-free interest rate – The rate is based on the U.S. Treasury yield curve in effect at the time of the grant for the same period of time as the expected life.

(4) | Expected dividend yield – The calculation is based on the total expected annual dividend payout divided by the average stock price.

We use the straight-line attribution method to recognize expense for all service-based option awards with graded vesting. Service-based option awards become immediately exercisable in full in the event of retirement, death or disability and upon a change in control with respect to all options that have been outstanding for at least six months. To be eligible for retirement, an employee must reach age 65.

Compensation costs associated with service-based option awards are recognized, net of an estimated forfeiture rate, over the requisite service period, which is the period between the grant date and the earlier of the award’s stated vesting term or the date the employee is eligible for retirement. We immediately recognize the entire amount of share-based compensation cost for employees that are eligible for retirement at the date of grant. For awards granted to employees approaching retirement eligibility, we recognize compensation cost on a straight-line basis over the period from the grant date through the retirement eligibility date. Share-based compensation expense for employees who are not retirement eligible is recognized on a straight-line basis over the stated vesting period of the award.

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MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

In August 2010, we granted 95,100 performance unit awards under our 2005 Stock Incentive Plan to certain employees. This was our first grant of such awards. As of December 31, 2010 and each December 31st thereafter through December 31, 2014, each award vested and became the right to receive a number of shares of common stock equal to a total vesting percentage multiplied by the number of units subject to such award. The total vesting percentage for each of the five years was equal to the sum of a performance vesting percentage, which was the percentage increase, if any, in our diluted net income per share for the year being measured over the prior year, and a service vesting percentage of five percentage points. The goal of the awards was to incentivize the certain employees to increase our earnings an average of fifteen percent per year over five years, which, when combined with the five percent per year service-based component, would result in full vesting over five years. The performance vesting percentage could be achieved earlier than in five years if annual earnings growth exceeded the average of fifteen percent, or not fully achieved if the annual earnings growth averaged less than fifteen percent over the five-year period. All payments were made in shares of our common stock. One half of the vested performance units were paid to the employees immediately upon vesting, with the other half being credited to the employees’ accounts within the Marten Transport, Ltd. Deferred Compensation Plan, which restricts the sale of vested shares to the later of each employee’s termination of employment or attainment of age 62.

In August 2011, we also granted 62,400 performance unit awards with similar terms to the awards granted in 2010, and which vested from December 31, 2011 through December 31, 2015.

In May 2012, we also granted 59,250 performance unit awards with similar terms to the awards granted in 2010 and 2011, and which vest from December 31, 2012 through December 31, 2016.

In May 2013, we also granted 62,550 performance unit awards with similar terms to the awards granted in 2010 through 2012, and which vest from December 31, 2013 through December 31, 2017.

In May 2014, we also granted 36,400 performance unit awards with similar terms to the awards granted in 2010 through 2013, and also granted 11,000 performance unit awards with similar terms to such awards except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in May 2014 vest from December 31, 2014 through December 31, 2018.

In May 2015, we also granted 35,000 performance unit awards under our 2015 Equity Incentive Plan with similar terms to the awards granted in 2010 through 2014, and also granted 19,500 performance unit awards with similar terms to such awards except that all vested performance units will be paid to the employees immediately upon vesting. All awards granted in May 2015 vest from December 31, 2015 through December 31, 2019.

The fair value of each performance unit is based on the closing market price on the date of grant. We recognize compensation expense for these awards based on the estimated number of units probable of achieving the vesting requirements of the awards, net of an estimated forfeiture rate.

The amount of share-based compensation recognized during a period is based on the value of the portion of the awards that are ultimately expected to vest. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We currently expect, based on an analysis of our historical forfeitures and known forfeitures on existing awards, that approximately 1.25% of unvested outstanding awards will be forfeited each year. This analysis will be re-evaluated quarterly and the forfeiture rate will be adjusted as necessary. Ultimately, the actual expense recognized over the vesting period will only be for those shares that vest.

53

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

Total share-based compensation expense recorded in 2015 was $1.4 million ($870,000 net of income tax benefit, $0.03 of earnings per basic and diluted share), in 2014 was $921,000 ($571,000 net of income tax benefit, $0.02 of earnings per basic and diluted share) and in 2013 was $1.1 million ($672,000 net of income tax benefit, $0.02 of earnings per basic and diluted share). All share-based compensation expense was recorded in salaries, wages and benefits expense.

The benefits of tax deductions in excess of recognized compensation costs (excess tax benefits) are recorded as a financing cash inflow rather than a deduction of taxes paid in operating cash flows. In 2015, 2014 and 2013, there was $432,000, $115,000 and $165,000, respectively, of excess tax benefits recognized resulting from exercises of options.

As of December 31, 2015, there was a total of $1.7 million of unrecognized compensation expense related to unvested service-based option awards, which is expected to be recognized over a weighted-average period of 3.4 years, and $2.4 million of unrecognized compensation expense related to unvested performance unit awards, which will be recorded based on the estimated number of units probable of achieving the vesting requirements of the awards through 2019.

Option activity in 2015 was as follows:

|  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2014 |  |  | 977,867 |  |  | $ | 14.74 |
Granted |  |  | 154,000 |  |  |  | 22.37 |
Exercised |  |  | (270,283 | ) |  |  | 12.91 |
Forfeited |  |  | (11,400 | ) |  |  | 17.70 |
Outstanding at December 31, 2015 |  |  | 850,184 |  |  | $ | 16.67 |
Exercisable at December 31, 2015 |  |  | 512,634 |  |  | $ | 14.50 |

The 850,184 options outstanding as of December 31, 2015 have a weighted average remaining contractual life of 3.6 years and an aggregate intrinsic value based on our closing stock price on December 31, 2015 for in-the-money options of $2.0 million. The 512,634 options exercisable as of the same date have a weighted average remaining contractual life of 2.5 years and an aggregate intrinsic value similarly calculated of $1.7 million.

The fair value of options granted in 2015, 2014 and 2013 was $918,000, $475,000 and $953,000, respectively, for service-based options. The total intrinsic value of options exercised in 2015, 2014 and 2013 was $2.4 million, $761,000 and $915,000, respectively. Intrinsic value is the difference between the fair value of the acquired shares at the date of exercise and the exercise price, multiplied by the number of options exercised. Proceeds received from option exercises in 2015, 2014 and 2013 were $3.5 million, $1.2 million and $1.1 million, respectively.

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MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

Nonvested service-based option awards as of December 31, 2015 and changes during 2015 were as follows:

|  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Weighted Average Remaining Contractual Life (in Years) |
Nonvested at December 31, 2014 |  |  | 282,550 |  |  | $ | 5.60 |  |  |  | 5.3 |
Granted |  |  | 154,000 |  |  |  | 5.96 |  |  |  | 6.4 |
Vested |  |  | (89,300 | ) |  |  | 5.62 |  |  |  | 3.6 |
Forfeited |  |  | (9,700 | ) |  |  | 5.40 |  |  |  | 4.7 |
Nonvested at December 31, 2015 |  |  | 337,550 |  |  | $ | 5.77 |  |  |  | 5.4 |

The total fair value of options which vested during 2015, 2014 and 2013 was $502,000, $541,000 and $636,000, respectively.

The following table summarizes our nonvested performance unit award activity in 2015:

|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2014 |  |  | 150,517 |  |  | $ | 16.37 |
Granted |  |  | 54,500 |  |  |  | 21.80 |
Vested |  |  | (43,620 | ) (1) |  |  | 16.90 |
Forfeited |  |  | (19,952 | ) |  |  | 13.12 |
Nonvested at December 31, 2015 |  |  | 141,445 |  |  | $ | 18.76 |

(1) | This number of performance unit award shares vested based on our financial performance in 2015 and was distributed or credited to the Marten Transport, Ltd. Deferred Compensation Plan in March 2016. As permitted in the performance unit award agreements, the Compensation Committee of our Board of Directors adjusted the calculation of the performance vesting component for 2015 to be based on our increase in net income instead of our increase in diluted net income per share. Additionally, the after-tax value of the gain on disposition of facilities in 2015 was excluded from the calculation of the increase in net income. The fair value of unit award shares that vested in 2015 was $737,000.

Retirement Savings Plan - We sponsor a defined contribution retirement savings plan under Section 401(k) of the Internal Revenue Code. Employees are eligible for the plan after three months of service. Participants are able to contribute up to the limit set by law, which in 2015 was $18,000 for participants less than age 50 and $24,000 for participants age 50 and above. We contribute 35% of each participant’s contribution, up to a total of 6% contributed. Our contribution vests at the rate of 20% per year for the first through fifth years of service. In addition, we may make elective contributions as determined by the Board of Directors. No elective contributions were made in 2015, 2014 or 2013. Total expense recorded for the plan was $1.9 million in 2015, $1.5 million in 2014 and $1.4 million in 2013.

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MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

Stock Purchase Plans - An Employee Stock Purchase Plan and an Independent Contractor Stock Purchase Plan are sponsored to encourage employee and independent contractor ownership of our common stock. Eligible participants specify the amount of regular payroll or contract payment deductions and voluntary cash contributions that are used to purchase shares of our common stock. The purchases are made at the market price on the open market. We pay the broker’s commissions and administrative charges for purchases of common stock under the plans.

1 4. Deferred Compensation Plan

In August 2010, our Board of Directors approved and adopted the Marten Transport, Ltd. Deferred Compensation Plan. The deferred compensation plan is an unfunded, nonqualified deferred compensation plan designed to allow board elected officers and other select members of our management designated by our Compensation Committee to save for retirement on a tax-deferred basis.

Under the terms of the plan, each participant is eligible to defer portions of their base pay, annual bonus, or receipt of common stock otherwise payable under a vested performance unit award. Each participant can elect a fixed distribution date for the participant’s deferral account other than certain required performance unit award deferrals credited to the discretionary account, which will be distributed after the later of the date of the participant’s termination of employment or the date the participant attains age 62. Upon termination of a participant’s employment with the company, the plan requires a lump-sum distribution of the deferral account, excluding the required performance unit award deferrals, unless the participant had elected an installment distribution. Upon a participant’s death, the plan provides that a participant’s distributions accelerate and will be paid in a lump sum to the participant’s beneficiary. We may terminate the plan and accelerate distributions to participants, but only to the extent and at the times permitted under the Internal Revenue Code. We may terminate the plan and accelerate distributions upon a change in control, which is not a payment event under the plan. In conjunction with the approval of the plan, our Board of Directors also adopted an amendment to the Marten Transport, Ltd. 2005 Stock Incentive Plan to allow for deferral of receipt of income from a performance unit award under the plan. Such deferral is also provided for within the Marten Transport, Ltd. 2015 Equity Incentive Plan. As of December 31, 2015, 90,143 shares of Company common stock were credited to account balances within the plan. These shares were required performance unit award deferrals of vested awards, and dividends earned on such shares.

15. Fair Value of Financial Instruments

The carrying amounts of cash equivalents, accounts receivable and accounts payable approximate fair value because of the short maturity of these instruments. The carrying amount of our long-term debt approximates fair value as its interest rate is based upon prevailing market rates.

1 6. Commitments and Contingencies

We are committed to new revenue equipment expenditures of $38.8 million in 2016, building construction expenditures of $2.0 million in 2016 and operating lease obligation expenditures totaling $464,000 through 2019.

We self-insure, in part, for losses relating to workers’ compensation, auto liability, general liability, cargo and property damage claims, along with employees’ health insurance with varying risk retention levels. We maintain insurance coverage for per-incident and total losses in excess of these risk retention levels in amounts we consider adequate based upon historical experience and our ongoing review, and reserve currently for the estimated cost of the uninsured portion of pending claims.

We are also involved in other legal actions that arise in the ordinary course of business. In the opinion of management, based upon present knowledge of the facts, it is remote that the ultimate outcome of any such legal actions will have a material adverse effect upon our long-term financial position or results of operations.

56

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

1 7. Business Segments

Beginning with fiscal 2014, we have aggregated our six current operating segments into four reporting segments (Truckload, Dedicated, Intermodal and Brokerage) for financial reporting purposes, compared with two reporting segments previously. We believe reporting our results in this manner will provide better visibility and understanding into our business and better reflect our operational structure. Information for prior periods has been shown in the same four segments for comparison purposes.

The primary source of our operating revenue is provided by our Truckload segment through a combination of regional short-haul and medium-to-long-haul full-load transportation services. We transport food and other consumer packaged goods that require a temperature-controlled or insulated environment across the United States and into and out of Mexico and Canada.

Our Dedicated segment provides customized transportation solutions tailored to meet individual customers’ requirements, utilizing temperature-controlled trailers, dry vans and other specialized equipment within the United States. Our customer contracts range from three to five years and are subject to annual rate reviews.

Our Intermodal segment transports our customers’ freight within the United States primarily utilizing our temperature-controlled trailers and also, through March 2015, our dry containers on railroad flatcars for portions of trips, with the balance of the trips using our tractors or, to a lesser extent, contracted carriers.

Our Brokerage segment arranges for smaller third-party carriers to transport freight for our customers in temperature-controlled trailers and dry vans within the United States and into and out of Mexico while we retain the billing, collection and customer management responsibilities. Our Brokerage segment also included the revenue of MWL, a third-party provider of logistics services to the transportation industry, until we deconsolidated our 45% interest in MWL effective March 28, 2013.

57

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

The following table sets forth for the years indicated our operating revenue and operating income by segment. We do not prepare separate balance sheets by segment and, as a result, assets are not separately identifiable by segment.

(Dollars in thousands) |  | 201 5 |  |  | 2014 |  |  | 2013 |
Operating revenue: |  |  |  |  |  |  |  |  |  |  |  |
Truckload revenue, net of fuel surcharge revenue |  | $ | 348,101 |  |  | $ | 358,458 |  |  | $ | 366,798 |
Truckload fuel surcharge revenue |  |  | 50,260 |  |  |  | 89,815 |  |  |  | 98,161 |
Total Truckload revenue |  |  | 398,361 |  |  |  | 448,273 |  |  |  | 464,959 |
Dedicated revenue, net of fuel surcharge revenue |  |  | 107,264 |  |  |  | 56,609 |  |  |  | 33,526 |
Dedicated fuel surcharge revenue |  |  | 11,008 |  |  |  | 13,743 |  |  |  | 8,794 |
Total Dedicated revenue |  |  | 118,272 |  |  |  | 70,352 |  |  |  | 42,320 |
Intermodal revenue, net of fuel surcharge revenue |  |  | 65,877 |  |  |  | 75,447 |  |  |  | 71,764 |
Intermodal fuel surcharge revenue |  |  | 11,081 |  |  |  | 21,645 |  |  |  | 20,749 |
Total Intermodal revenue |  |  | 76,958 |  |  |  | 97,092 |  |  |  | 92,513 |
Brokerage revenue: |  |  |  |  |  |  |  |  |  |  |  |
Marten Transport |  |  | 71,403 |  |  |  | 57,212 |  |  |  | 52,746 |
MWL(1) |  |  | - |  |  |  | - |  |  |  | 6,676 |
Total Brokerage revenue |  |  | 71,403 |  |  |  | 57,212 |  |  |  | 59,422 |
Total operating revenue |  | $ | 664,994 |  |  | $ | 672,929 |  |  | $ | 659,214 |
Operating income: |  |  |  |  |  |  |  |  |  |  |  |
Truckload |  | $ | 35,517 |  |  | $ | 39,483 |  |  | $ | 39,290 |
Dedicated |  |  | 12,818 |  |  |  | 7,136 |  |  |  | 5,575 |
Intermodal |  |  | 4,832 |  |  |  | 1,735 |  |  |  | 4,014 |
Brokerage |  |  | 3,792 |  |  |  | 2,652 |  |  |  | 3,116 |
Total operating income before gain on disposition of facilities |  |  | 56,959 |  |  |  | 51,006 |  |  |  | 51,995 |
Gain on disposition of facilities |  |  | 4,104 |  |  |  | - |  |  |  | - |
Total operating income |  | $ | 61,063 |  |  | $ | 51,006 |  |  | $ | 51,995 |

(1) | Brokerage revenue is net of $2.1 million of inter-segment revenue in 2013 for loads transported by our tractors and arranged by MWL that have been eliminated in consolidation. The inter-segment revenue in 2013 relates to loads transported prior to the deconsolidation of MWL effective March 28, 2013.

Truckload segment depreciation expense was $53.7 million, $53.0 million and $54.6 million, Dedicated segment depreciation expense was $15.0 million, $8.2 million and $4.7 million, Intermodal segment depreciation expense was $5.4 million, $6.0 million and $4.3 million, and Brokerage segment depreciation expense was $1.3 million, $993,000 and $845,000, in 2015, 2014 and 2013, respectively.

18. Deferred Income Taxes Reclassification

In November 2015, the Financial Accounting Standards Board issued Accounting Standards Update No. 2015-17, “Income Taxes” which simplifies the balance sheet presentation of deferred income taxes. We have adopted the provisions of the standard for our 2015 consolidated financial statements including retroactive reclassification of the $3.2 million current deferred income tax asset as of December 31, 2014 to a noncurrent deferred income tax liability. This reclassification does not have a significant impact on our consolidated balance sheets.

58

MARTEN TRANSPORT, LTD.

Notes to Consolidated Financial Statements (Continued)

December 31, 2015, 2014 and 2013

19. Quarterly Financial Data (Unaudited)

The following is a summary of the quarterly results of operations for 2015 and 2014:

20 15 Quarters (In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 161,287 |  |  | $ | 163,588 |  |  | $ | 171,346 |  |  | $ | 168,773 |
Operating income |  |  | 17,311 |  |  |  | 14,161 |  |  |  | 14,354 |  |  |  | 15,237 |
Net income |  |  | 10,188 |  |  |  | 8,357 |  |  |  | 8,410 |  |  |  | 8,790 |
Basic earnings per common share |  |  | 0.30 |  |  |  | 0.25 |  |  |  | 0.25 |  |  |  | 0.26 |
Diluted earnings per common share |  |  | 0.30 |  |  |  | 0.25 |  |  |  | 0.25 |  |  |  | 0.26 |

2014 Quarters (In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 159,409 |  |  | $ | 168,423 |  |  | $ | 171,550 |  |  | $ | 173,547 |
Operating income |  |  | 8,640 |  |  |  | 12,932 |  |  |  | 13,042 |  |  |  | 16,392 |
Net income |  |  | 5,287 |  |  |  | 7,926 |  |  |  | 7,652 |  |  |  | 8,969 |
Basic earnings per common share |  |  | 0.16 |  |  |  | 0.24 |  |  |  | 0.23 |  |  |  | 0.27 |
Diluted earnings per common share |  |  | 0.16 |  |  |  | 0.24 |  |  |  | 0.23 |  |  |  | 0.27 |

The sum of the basic earnings per common share for the 2015 quarters is less than the basic earnings per common share for 2015, and the sum of the basic and diluted earnings per common share for the 2014 quarters exceeds the basic and diluted earnings per common share for 2014 due to differences in rounding.

59

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

As required by Rule 13a-15 under the Securities Exchange Act of 1934 (“Exchange Act”), we have carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(e)) as of the end of the period covered by this report. This evaluation was carried out under the supervision and with the participation of our management, including our Chief Executive Officer and our Executive Vice President and Chief Financial Officer. Based upon that evaluation, our Chief Executive Officer and our Executive Vice President and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of December 31, 2015. There were no changes in our internal control over financial reporting that occurred during the period covered by this report that have materially affected, or that are reasonably likely to materially affect, our internal control over financial reporting. We intend to periodically evaluate our disclosure controls and procedures as required by the Exchange Act Rules.

We have included Management’s Annual Report on Internal Control Over Financial Reporting in Item 8 above.

ITEM 9B. OTHER INFORMATION

None.

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PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

A. Directors of the Registrant.

The information in the “Election of Directors--Information About Nominees” and “Election of Directors--Other Information About Nominees” sections of our 2016 Proxy Statement is incorporated in this Report by reference.

B. Executive Officers of the Registrant.

Information about our executive officers is included in this Report under Item 4A, “Executive Officers of the Registrant.”

C. Compliance with Section 16(a) of the Exchange Act.

The information in the “Section 16(a) Beneficial Ownership Reporting Compliance” section of our 2016 Proxy Statement is incorporated in this Report by reference.

D. Procedure for Director Nominations by Security Holders.

There have been no material changes to the procedures by which security holders may recommend nominees to our board of directors.

E. Audit Committee Financial Expert.

The information in the “Election of Directors—Board and Board Committees” section of our 2016 Proxy Statement is incorporated in this Report by reference.

F. Identification of the Audit Committee.

The information in the “Election of Directors—Board and Board Committees” section of our 2016 Proxy Statement is incorporated in this Report by reference.

G. Code of Ethics for Senior Financial Management.

Our Code of Ethics for Senior Financial Management applies to all of our executive officers, including our principal executive officer, principal financial officer and controller, and meets the requirements of the Securities and Exchange Commission. We have posted our Code of Ethics for Senior Financial Management on our website at www.marten.com. We intend to disclose any amendments to and any waivers from a provision of our Code of Ethics for Senior Financial Management on our website within five business days following such amendment or waiver.

61

ITEM 11. EXECUTIVE COMPENSATION

The information in the “Election of Directors--Director Compensation,” “Compensation and Other Benefits” and “Compensation Discussion and Analysis” sections of our 2016 Proxy Statement is incorporated in this Report by reference.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information in the “Security Ownership of Certain Beneficial Owners and Management” and “Compensation and Other Benefits--Equity Compensation Plan Information” sections of our 2016 Proxy Statement is incorporated in this Report by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information in the “Related Party Transactions” and “Election of Directors--Board and Board Committees” sections of our 2016 Proxy Statement is incorporated in this Report by reference.

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information in the “Fees of Independent Auditors” section of our 2016 Proxy Statement is incorporated in this Report by reference.

62

PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a) | 1. | Financial Statements (See Part II, Item 8 of this Report): | Page
|  | Management’s Annual Report on Internal Control Over inancial Reporting | 36
|  | Reports of Independent Registered Public Accounting Firms | 37
|  | Consolidated Balance Sheets as of December 31, 2015 and 2014 | 40
|  | Consolidated Statements of Operations for the years ended December 31, 2015, 2014 and 2013 | 41
|  | Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2015, 2014 and 2013 | 42
|  | Consolidated Statements of Cash Flows for the years ended December 31, 2015, 2014 and 2013 | 43
|  | Notes to Consolidated Financial Statements | 44
| 2. | Financial Statement Schedules (Consolidated Financial Statement Schedule Included in Part IV of this Report): |
|  | Schedule II – Valuation and Qualifying Accounts and Reserves | 66
|  | Schedules not listed above have been omitted as the required information is inapplicable or the information is presented in the consolidated financial statements or related notes. |

63

| 3. | Exhibits: |
|  | The exhibits to this Report are listed in the Exhibit Index on pages 67 through 70. A copy of any of the exhibits listed will be sent at a reasonable cost to any shareholder as of March 14, 2016. Requests should be sent to James J. Hinnendael, Executive Vice President and Chief Financial Officer, at our corporate headquarters.
|  | The following is a list of each management contract or compensatory plan or arrangement required to be filed as an exhibit to this Report under Item 15(a)(3):
|  | (1) | Marten Transport, Ltd. 2005 Stock Incentive Plan.
|  | (2) | Amendment to the Marten Transport, Ltd. 2005 Stock Incentive Plan.
|  | (3) | Marten Transport, Ltd. 2015 Equity Incentive Plan.
|  | (4) | Form of Non-Statutory Stock Option Agreement for the 2015 Equity Incentive Plan.
|  | (5) | Form of Performance Unit Awards Agreement for the 2015 Equity Incentive Plan.
|  | (6) | Named Executive Officer Compensation.
|  | (7) | Form of Amended and Restated Change in Control Severance Agreement.
|  | (8) | Form of First Amendment to Amended and Restated Change in Control Severance Agreement.
|  | (9) | Form of Second Amendment to Amended and Restated Change in Control Agreement.
|  | (10) | Form of Indemnification Agreement.
|  | (11) | Marten Transport, Ltd. Deferred Compensation Plan.
|  | (12) | Executive Officer Performance Incentive Plan.
|  | (13) | Amended and Restated Executive Officer Performance Incentive Plan.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, Marten Transport, Ltd., the Registrant, has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

Dated: March 11, 2016 | MARTEN TRANSPORT, LTD.
| By | /s/ Randolph L. Marten
|  | Randolph L. Marten
|  | Chairman of the Board and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below on March 11, 2016, by the following persons on behalf of the Registrant and in the capacities indicated.

Signature |  | Title
/s/ Randolph L. Marten |  | Chairman of the Board, Chief Executive Officer and Director
Randolph L. Marten |  | (Principal Executive Officer)
/s/ James J. Hinnendael |  | Executive Vice President and Chief Financial Officer
James J. Hinnendael |  | (Principal Financial and Accounting Officer)
/s/ Larry B. Hagness |  | Director
Larry B. Hagness |  |
/s/ Thomas J. Winkel |  | Director
Thomas J. Winkel |  |
/s/ Jerry M. Bauer |  | Director
Jerry M. Bauer |  |
/s/ Robert L. Demorest |  | Director
Robert L. Demorest |  |
/s/ G. Larry Owens |  | Director
G. Larry Owens |  |
/s/ Ronald R. Booth |  | Director
Ronald R. Booth |  |

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SCHEDULE II

MARTEN TRANSPORT, LTD.

Valuation and Qualifying Accounts and Reserves
(In thousands)

Description |  | Balance at Beginning of Year |  |  | Charged to Costs and Expenses |  |  | Deductions |  |  | Balance at End of Year |
Insurance and claims accruals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2015 |  | $ | 13,998 |  |  | $ | 45,271 |  |  | $ | (43,034 | )(1) |  | $ | 16,235 |
Year ended December 31, 2014 |  |  | 14,404 |  |  |  | 41,036 |  |  |  | (41,442 | )(1) |  |  | 13,998 |
Year ended December 31, 2013 |  |  | 13,838 |  |  |  | 35,194 |  |  |  | (34,628 | )(1) |  |  | 14,404 |
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2015 |  |  | 475 |  |  |  | 59 |  |  |  | (229 | )(2) |  |  | 305 |
Year ended December 31, 2014 |  |  | 450 |  |  |  | 264 |  |  |  | (239 | )(2) |  |  | 475 |
Year ended December 31, 2013 |  |  | 334 |  |  |  | 225 |  |  |  | (109 | )(2) |  |  | 450 |

(1) Claims payments

(2) Write-off of bad debts, net of recoveries

See report of independent registered public accounting firm.

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MARTEN TRANSPORT, LTD.

EXHIBIT INDEX TO ANNUAL REPORT

ON FORM 10-K

For the Year Ended December 31, 2015

Item No. | Item |  | Filing Method
3.1 | Amended and Restated Certificate of Incorporation effective August 11, 2003 |  | Incorporated by reference to Exhibit 4.1 of the Company’s Amendment No. 2 to Registration Statement on Form S-2 (File No. 333-107367).
3.2 | Amendment to Amended and Restated Certificate of Incorporation effective May 25, 2005 |  | Incorporated by reference to Exhibit 3.3 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2005 (File No. 0-15010).
3.3 | Second Amendment to Amended and Restated Certificate of Incorporation effective June 1, 2015 |  | Incorporated by reference to Exhibit 3.4 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 (File No. 0-15010).
3.4 | Bylaws of the Company, as amended |  | Incorporated by reference to Exhibit 3.3 of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007 (File No. 0-15010).
4.1 | Specimen form of the Company’s Common Stock Certificate |  | Incorporated by reference to Exhibit 4.1 of the Company’s Registration Statement on Form S-1 (File No. 33-8108).
4.2 | Amended and Restated Certificate of Incorporation effective August 11, 2003 |  | See Exhibit 3.1 above.
4.3 | Amendment to Amended and Restated Certificate of Incorporation effective May 25, 2005 |  | See Exhibit 3.2 above.
4.4 | Second Amendment to Amended and Restated Certificate of Incorporation effective June 1, 2015 |  | See Exhibit 3.3 above.
4.5 | Bylaws of the Company |  | See Exhibit 3.4 above.
10.1 | Marten Transport, Ltd. 2005 Stock Incentive Plan |  | Incorporated by reference to Exhibit 10.18 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2005 (File No. 0-15010).
10.2 | Credit Agreement, dated as of August 31, 2006, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed September 6, 2006.

67

Item No. | Item |  | Filing Method
10.3 | First Amendment to Credit Agreement, effective as of January 1, 2007, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed January 5, 2007.
10.4 | Form of Amended and Restated Change in Control Severance Agreement |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed August 15, 2007.
10.5 | Second Amendment to Credit Agreement, effective as of November 30, 2007, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders |  | Incorporated by reference to Exhibit 10.14 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2007 (File No. 0-15010).
10.6 | Form of First Amendment to Amended and Restated Change in Control Severance Agreement |  | Incorporated by reference to Exhibit 10.18 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-15010).
10.7 | Form of Indemnification Agreement |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed February 22, 2010.
10.8 | Amendment to the Marten Transport, Ltd. 2005 Stock Incentive Plan |  | Incorporated by reference to Exhibit 10.17 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 (File No. 0-15010).
10.9 | Marten Transport, Ltd. Deferred Compensation Plan |  | Incorporated by reference to Exhibit 10.18 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 (File No. 0-15010).
10.10 | Form of Second Amendment to Amended and Restated Change in Control Agreement |  | Incorporated by Reference to Exhibit 10.2 of the Company’s Current Report on Form 8-K filed March 8, 2011.
10.11 | Third Amendment to Credit Agreement, dated as of May 27, 2011, by and among Marten Transport, Ltd. as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed May 31, 2011.
10.12 | Executive Officer Performance Incentive Plan |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed March 5, 2012.

68

Item No. | Item |  | Filing Method
10.13 | Fourth Amendment to Credit Agreement, dated as of December 10, 2012, between Marten Transport, Ltd. as borrower and U.S. Bank National Association |  | Incorporated by reference to Exhibit 10.18 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 (File No. 0-15010).
10.14 | Letter from KPMG LLP dated March 13, 2014 |  | Incorporated by reference to Exhibit 16.1 of the Company’s Current Report on Form 8-K filed March 13, 2014.
10.15 | Fifth Amendment to Credit Agreement, dated as of December 22, 2014, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed December 29, 2014.
10.16 | Named Executive Officer Compensation |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed May 15, 2015.
10.17 | Form of Non-Statutory Stock Option Agreement for the 2015 Equity Incentive Plan |  | Incorporated by reference to Exhibit 10.3 of the Company’s Current Report on Form 8-K filed May 15, 2015.
10.18 | Form of Performance Unit Awards Agreement for the 2015 Equity Incentive Plan |  | Incorporated by reference to Exhibit 10.4 of the Company’s Current Report on Form 8-K filed May 15, 2015.
10.19 | Marten Transport, Ltd. 2015 Equity Incentive Plan |  | Incorporated by reference to Exhibit 10.21 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 (File No. 0-15010).
10.20 | Sixth Amendment to Credit Agreement, dated as of November 4, 2015, by and among Marten Transport, Ltd., as borrower, the banks party thereto as lenders, and U.S. Bank National Association, as agent for the lenders |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed November 6, 2015.
10.21 | Amended and Restated Executive Officer Performance Incentive Plan |  | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed December 4, 2015.
23.1 | Consent of Grant Thornton LLP |  | Filed with this Report.
23.2 | Consent of KPMG LLP |  | Filed with this Report.
31.1 | Certification pursuant to Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, by Randolph L. Marten, the Registrant’s Chief Executive Officer (Principal Executive Officer) |  | Filed with this Report.

69

Item No. | Item |  | Filing Method
31.2 | Certification pursuant to Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, by James J. Hinnendael, the Registrant’s Executive Vice President and Chief Financial Officer (Principal Financial Officer) |  | Filed with this Report.
32.1 | Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 |  | Filed with this Report.
101 | The following financial information from Marten Transport, Ltd.’s Annual Report on Form 10-K for the period ended December 31, 2015, filed with the SEC on March 11, 2016, formatted in eXtensible Business Reporting Language (XBRL): (i) Consolidated Balance Sheets as of December 31, 2015 and December 31, 2014, (ii) Consolidated Statements of Operations for the three years ended December 31, 2015, (iii) Consolidated Statements of Stockholders’ Equity for the three years ended December 31, 2015, (iv) Consolidated Statements of Cash Flows for the three years ended December 31, 2015, and (v) Notes to Consolidated Financial Statements. |  | Filed with this Report.

70