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Table of Contents
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
__________________
FORM 10-Q
__________________

ý | Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the Quarterly Period Ended September 30, 2018
or

o | Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from _____ to _____
Commission file number 001-38600
__________________
TENABLE HOLDINGS, INC.
(Exact name of registrant as specified in its charter)
__________________

Delaware |  | 47-5580846
(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification Number)

7021 Columbia Gateway Drive, Suite 500, Columbia, Maryland, 21046
(Address of principal executive offices, including zip code)
(410) 872-0555
(Registrant’s telephone number, including area code)
__________________
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 ý No ¨
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ý No ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer | o |  | Accelerated filer | o
Non-accelerated filer | ý |  |  |
Emerging growth company | ý |  | Smaller reporting company | o
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ý

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No ý
The number of shares of the Registrant's common stock outstanding as of October 31, 2018 was 93,064,759.

TENABLE HOLDINGS, INC.
TABLE OF CONTENTS

|  | Page
PART I – FINANCIAL INFORMATION
Item 1. | Financial Statements |
| Consolidated Balance Sheets | 3
| Consolidated Statements of Operations and Comprehensive Loss | 4
| Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) | 5
| Consolidated Statements of Cash Flows | 6
| Notes to Consolidated Financial Statements | 7
| 1. Business and Summary of Significant Accounting Policies | 7
| 2. Fair Value Measurements | 11
| 3. Property and Equipment, Net | 11
| 4. Debt | 11
| 5. Commitments and Contingencies | 12
| 6. Redeemable Convertible Preferred Stock | 12
| 7. Stock-Based Compensation | 13
| 8. Net Loss Per Share Attributable to Common Stockholders | 15
| 9. Income Taxes | 15
| 10. Geographic Information | 15
Item 2. | Management’s Discussion and Analysis of Financial Condition and Results of Operations | 17
Item 3. | Quantitative and Qualitative Disclosures About Market Risk | 33
Item 4. | Controls and Procedures | 33
PART II – OTHER INFORMATION
Item 1. | Legal Proceedings | 35
Item 1A. | Risk Factors | 35
Item 2. | Unregistered Sales of Equity Securities and Use of Proceeds | 58
Item 6. | Exhibits | 59
| Signatures | 60

2

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PART I. FINANCIAL INFORMATION
Item 1. Financial Statements
TENABLE HOLDINGS, INC.
CONSOLIDATED BALANCE SHEETS

| September 30, 2018 |  | December 31, 2017
(in thousands, except share and per share data) | (unaudited) |  |
Assets |  |  |
Current assets: |  |  |
Cash and cash equivalents | $ | 253,026 |  |  | $ | 27,210 |
Short-term investments | 34,125 |  |  | — |
Accounts receivable (net of allowance for doubtful accounts of $196 and $160 at September 30, 2018 and December 31, 2017, respectively) | 59,035 |  |  | 50,881 |
Deferred commissions | 20,401 |  |  | 17,170 |
Prepaid expenses and other current assets | 14,718 |  |  | 15,994 |
Total current assets | 381,305 |  |  | 111,255 |
Property and equipment, net | 10,872 |  |  | 10,754 |
Construction in progress | 23,546 |  |  | 2,252 |
Deferred commissions (net of current portion) | 32,483 |  |  | 33,006 |
Intangible assets, net | 578 |  |  | 1,031 |
Goodwill | 265 |  |  | 265 |
Other assets | 5,149 |  |  | 5,774 |
Total assets | $ | 454,198 |  |  | $ | 164,337 |
Liabilities, Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) |  |  |
Current liabilities: |  |  |
Accounts payable | $ | 538 |  |  | $ | 338 |
Accrued expenses | 6,570 |  |  | 4,878 |
Accrued compensation | 19,734 |  |  | 18,482 |
Deferred revenue | 191,578 |  |  | 154,898 |
Other current liabilities | 1,897 |  |  | 1,750 |
Total current liabilities | 220,317 |  |  | 180,346 |
Deferred revenue (net of current portion) | 74,120 |  |  | 70,920 |
Financing obligation | 23,096 |  |  | 1,802 |
Other liabilities | 4,104 |  |  | 5,199 |
Total liabilities | 321,637 |  |  | 258,267 |
Commitments and contingencies (Note 5) |  |  |
Redeemable convertible Series A preferred stock (par value: $0.01; no shares authorized, issued, and outstanding at September 30, 2018; 15,848 shares authorized, issued and outstanding with liquidation preference of $50,000 at December 31, 2017) | — |  |  | 49,935 |
Redeemable convertible Series B preferred stock (par value: $0.01; no shares authorized, issued and outstanding at September 30, 2018; 42,000 shares authorized, 39,538 issued and outstanding with liquidation preference of $230,008 at December 31, 2017) | — |  |  | 227,800 |
Stockholders’ equity (deficit): |  |  |
Common stock (par value: $0.01; 500,000 and 93,855 shares authorized at September 30, 2018 and December 31, 2017; 93,040 and 24,472 shares issued and outstanding at September 30, 2018 and December 31, 2017) | 930 |  |  | 246 |
Additional paid-in capital | 578,125 |  |  | 20,676 |
Accumulated deficit | (446,494 | ) |  | (392,587 | )
Total stockholders’ equity (deficit) | 132,561 |  |  | (371,665 | )
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit) | $ | 454,198 |  |  | $ | 164,337 |

The accompanying notes are an integral part of these consolidated financial statements.
3

Table of Contents
TENABLE HOLDINGS, INC.
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
(Unaudited)

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands, except per share data) | 2018 |  | 2017 |  | 2018 |  | 2017
Revenue | $ | 69,440 |  |  | $ | 48,980 |  |  | $ | 192,139 |  |  | $ | 133,610 |
Cost of revenue | 12,161 |  |  | 7,424 |  |  | 30,768 |  |  | 17,210 |
Gross profit | 57,279 |  |  | 41,556 |  |  | 161,371 |  |  | 116,400 |
Operating expenses: |  |  |  |  |  |  |
Sales and marketing | 44,550 |  |  | 29,574 |  |  | 125,964 |  |  | 83,515 |
Research and development | 20,553 |  |  | 15,869 |  |  | 55,529 |  |  | 42,040 |
General and administrative | 13,272 |  |  | 7,275 |  |  | 32,868 |  |  | 19,982 |
Total operating expenses | 78,375 |  |  | 52,718 |  |  | 214,361 |  |  | 145,537 |
Loss from operations | (21,096 | ) |  | (11,162 | ) |  | (52,990 | ) |  | (29,137 | )
Other income (expense), net | 709 |  |  | (92 | ) |  | 240 |  |  | (65 | )
Loss before income taxes | (20,387 | ) |  | (11,254 | ) |  | (52,750 | ) |  | (29,202 | )
Provision for income taxes | 482 |  |  | 59 |  |  | 1,157 |  |  | 151 |
Net loss and comprehensive loss | (20,869 | ) |  | (11,313 | ) |  | (53,907 | ) |  | (29,353 | )
Accretion of Series A and B redeemable convertible preferred stock | (55 | ) |  | (192 | ) |  | (434 | ) |  | (570 | )
Net loss attributable to common stockholders | $ | (20,924 | ) |  | $ | (11,505 | ) |  | $ | (54,341 | ) |  | $ | (29,923 | )
Net loss per share attributable to common stockholders, basic and diluted | $ | (0.28 | ) |  | $ | (0.51 | ) |  | $ | (1.34 | ) |  | $ | (1.36 | )
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted | 74,261 |  |  | 22,679 |  |  | 40,688 |  |  | 22,004 |

The accompanying notes are an integral part of these consolidated financial statements.
4

Table of Contents
TENABLE HOLDINGS, INC.
CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE
PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
(Unaudited)

| Redeemable Convertible Preferred Stock |  |  |  |  |  |  | Additional |  |  |  | Total
| Series A |  | Series B |  |  | Common Stock |  | Paid-in |  | Accumulated |  | Stockholders’
(in thousands) | Shares |  | Amount |  | Shares |  | Amount |  |  | Shares |  | Amount |  | Capital |  | Deficit |  | Equity (Deficit)
Balance at December 31, 2017 | 15,848 |  | $ | 49,935 |  |  | 39,538 |  | $ | 227,800 |  |  |  | 24,472 |  | $ | 246 |  |  | $ | 20,676 |  |  | $ | (392,587 | ) |  | $ | (371,665 | )
Accretion of Series A and B redeemable convertible preferred stock | — |  |  | 13 |  |  | — |  |  | 421 |  |  |  | — |  |  | — |  |  | (434 | ) |  | — |  |  | (434 | )
Exercise of stock options | — |  |  | — |  |  | — |  |  | — |  |  |  | 654 |  |  | 6 |  |  | 1,409 |  |  | — |  |  | 1,415 |
Repurchase of common stock | — |  |  | — |  |  | — |  |  | — |  |  |  | (7 | ) |  | (1 | ) |  | (74 | ) |  | — |  |  | (75 | )
Stock-based compensation | — |  |  | — |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  | 14,259 |  |  | — |  |  | 14,259 |
Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering expenses | — |  |  | — |  |  | — |  |  | — |  |  |  | 12,535 |  |  | 125 |  |  | 264,674 |  |  | — |  |  | 264,799 |
Conversion of redeemable convertible preferred stock to common stock upon initial public offering | (15,848 | ) |  | (49,948 | ) |  | (39,538 | ) |  | (228,221 | ) |  |  | 55,386 |  |  | 554 |  |  | 277,615 |  |  | — |  |  | 278,169 |
Net loss | — |  |  | — |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  | — |  |  | (53,907 | ) |  | (53,907 | )
Balance at September 30, 2018 | — |  |  | $ | — |  |  | — |  |  | $ | — |  |  |  | 93,040 |  |  | $ | 930 |  |  | $ | 578,125 |  |  | $ | (446,494 | ) |  | $ | 132,561 |

The accompanying notes are an integral part of these consolidated financial statements.
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TENABLE HOLDINGS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited)

| Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017
Cash flows from operating activities: |  |  |
Net loss | $ | (53,907 | ) |  | $ | (29,353 | )
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 4,580 |  |  | 3,316 |
Stock-based compensation | 14,206 |  |  | 5,503 |
Deferred income taxes | — |  |  | 486 |
Other | 771 |  |  | 23 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (8,190 | ) |  | (8,435 | )
Prepaid expenses and other current assets | 1,228 |  |  | (540 | )
Deferred commissions | (2,708 | ) |  | (11,275 | )
Other assets | 564 |  |  | (1,537 | )
Accounts payable and accrued expenses | 1,930 |  |  | 2,485 |
Accrued compensation | 1,252 |  |  | (715 | )
Deferred revenue | 39,880 |  |  | 40,066 |
Other current liabilities | 36 |  |  | (840 | )
Other liabilities | (647 | ) |  | 2 |
Net cash used in operating activities | (1,005 | ) |  | (814 | )
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (4,140 | ) |  | (1,628 | )
Purchases of short-term investments | (34,114 | ) |  | — |
Net cash used in investing activities | (38,254 | ) |  | (1,628 | )
Cash flows from financing activities: |  |  |
Proceeds from initial public offering, net of underwriting discounts and commissions | 268,531 |  |  | — |
Payments of costs related to initial public offering | (3,732 | ) |  | — |
Principal payments under capital lease obligations | (389 | ) |  | (173 | )
Credit facility issuance costs | — |  |  | (238 | )
Proceeds from the exercise of stock options | 1,415 |  |  | 2,847 |
Repurchases of common stock | (75 | ) |  | (385 | )
Net cash provided by financing activities | 265,750 |  |  | 2,051 |
Effect of exchange rate changes on cash and cash equivalents and restricted cash | (675 | ) |  | 22 |
Net increase (decrease) in cash and cash equivalents and restricted cash | 225,816 |  |  | (369 | )
Cash and cash equivalents and restricted cash at beginning of period | 27,472 |  |  | 34,470 |
Cash and cash equivalents and restricted cash at end of period | $ | 253,288 |  |  | $ | 34,101 |
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | $ | 85 |  |  | $ | 46 |
Cash paid for income taxes | $ | 920 |  |  | $ | 510 |
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Assets acquired under capital leases | $ | 4 |  |  | $ | 826 |
Asset retirement obligations | $ | 67 |  |  | $ | 764 |
Construction in progress | $ | 21,294 |  |  | $ | — |

The accompanying notes are an integral part of these consolidated financial statements.
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TENABLE HOLDINGS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
(Unaudited)
1. Business and Summary of Significant Accounting Policies
Business Description
Tenable Holdings, Inc. (the “Company,” “we,” "us," or “our”) is a provider of Cyber Exposure solutions, which is a discipline for managing and measuring cybersecurity risk in the digital era. Our enterprise software platform enables broad visibility into an organization’s cyber exposure across the modern attack surface and deep insights that help organizations translate technical data into business insights to understand and reduce their cybersecurity risk.
Basis of Presentation
The accompanying consolidated financial statements include the accounts of Tenable Holdings, Inc. and our wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
The consolidated financial statements have been prepared in conformity with United States generally accepted accounting principles (“GAAP”) for interim financial information. The consolidated statements are unaudited and should be read in conjunction with the consolidated financial statements and related notes included in our final prospectus for our initial public offering ("IPO") dated as of July 25, 2018 and filed with the Securities and Exchange Commission pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, on July 26, 2018 ("Prospectus").
The consolidated financial statements have been prepared on a basis consistent with the audited annual consolidated financial statements included in the Prospectus and, in the opinion of management, include all adjustments of a normal recurring nature necessary to fairly state our financial position, our results of operations, and cash flows.
The results for the nine months ended September 30, 2018 are not necessarily indicative of the operating results expected for the year ending December 31, 2018.
Initial Public Offering
On July 30, 2018, we completed our IPO, in which we issued and sold 12,535,000 shares of common stock at a price to the public of $23.00 per share, including 1,635,000 shares of common stock purchased by our underwriters from the full exercise of their over-allotment option. All of the shares sold in the IPO were sold by the Company. We received net proceeds of $264.8 million after deducting underwriting discounts and commissions and other offering expenses.
Upon the completion of our IPO, all 15,847,500 shares of our Series A Redeemable Convertible Preferred Stock ("Series A") and 39,538,354 shares of our Series B Redeemable Convertible Preferred Stock ("Series B") automatically converted into an aggregate of 55,385,854 shares of our common stock. Our newly adopted Amended and Restated Certificate of Incorporation authorizes a total of 500,000,000 shares of common stock and 10,000,000 shares of preferred stock.
Use of Estimates
The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. These estimates include, but are not limited to, the determination of the estimated economic life of perpetual licenses for revenue recognition, the estimated period of benefit for deferred commissions, useful lives of long-lived assets, the valuation of stock-based compensation, including the estimated underlying fair value of our common stock prior to our IPO, and the valuation of deferred tax assets. We base these estimates on historical experience and on various other assumptions that we believe to be reasonable. Actual results could differ significantly from these estimates.
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Investments
We currently invest in commercial paper, corporate bonds, and U.S. treasury and agency obligations. Our investments are classified as available-for-sale and recorded at fair value, with unrealized gains and losses reported in accumulated other comprehensive loss within stockholders’ equity (deficit). We review our investment portfolio to determine whether investments have indicators of possible impairment.
Revenue Recognition
We early adopted Accounting Standards Codification (“ASC”) Topic 606, Revenue From Contracts With Customers (“ASC 606”), on January 1, 2017 using the modified retrospective method and applying the guidance to all contracts as of January 1, 2017. The most significant impact of adopting ASC 606 was the deferral of perpetual license revenue over an estimated economic life, including estimated maintenance renewal periods, whereas under the previous guidance we recognized perpetual license revenue upon delivery of the perpetual license. Additionally, the incremental costs of obtaining a contract with a customer are deferred, and will be amortized over a longer estimated period of benefit, whereas under previous guidance we amortized such costs over the contract term.
The core principle of ASC 606 is that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve the core principle of ASC 606, we apply the following steps:
•Identify the contract with a customer
•Identify the performance obligations in the contract
•Determine the transaction price
•Allocate the transaction price to the performance obligations in the contract
•Recognize revenue when or as performance obligations are satisfied
We generate revenue from subscription arrangements for software and cloud-based solutions, perpetual licenses, maintenance associated with perpetual licenses, and professional services and other revenue. We begin to recognize revenue when control of our software or services is transferred to the customer, which for sales made through distributors is concurrent with the transfer to the end user.
The following table presents a summary of revenue:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Subscription revenue | $ | 53,511 |  |  | $ | 34,932 |  |  | $ | 146,568 |  |  | $ | 93,478 |
Perpetual license and maintenance revenue | 13,864 |  |  | 12,857 |  |  | 40,753 |  |  | 37,129 |
Professional services and other revenue | 2,065 |  |  | 1,191 |  |  | 4,818 |  |  | 3,003 |
Revenue | $ | 69,440 |  |  | $ | 48,980 |  |  | $ | 192,139 |  |  | $ | 133,610 |

Subscription Revenue
Subscription arrangements generally have annual or multi-year contractual terms and allow customers to use our software or cloud solutions, including ongoing software updates and the ability to identify the latest cybersecurity vulnerabilities. Revenue is recognized ratably over the subscription term given the critical utility provided by the ongoing updates that are released throughout the contract period.
Perpetual License and Maintenance Revenue
Our perpetual licenses are generally sold with one or more years of maintenance, which include ongoing software updates and the ongoing ability to identify the latest cybersecurity vulnerabilities. Given the critical utility provided by the
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ongoing software updates and updated ability to identify network vulnerabilities included in maintenance, we combine the perpetual license and the maintenance into a single performance obligation. Perpetual license arrangements generally contain a material right related to the customer’s ability to renew maintenance at a price that is less than the initial license fee. We apply a practical alternative to allocating a portion of the transaction price to the material right performance obligation and estimate a hypothetical transaction price which includes fees for expected maintenance renewals based on the estimated economic life of the perpetual license contracts. We allocate the transaction price between the cybersecurity subscription provided in the initial contract and the material right related to expected contract renewals based on the hypothetical transaction price. We recognize the amount allocated to the combined license and maintenance performance obligation over the initial contractual period, which is generally one year. We recognize the amount allocated to the material right over the expected maintenance renewal period, which begins at the end of the initial contractual term and is generally four years. We have estimated the five-year economic life of perpetual license contracts based on historical contract attrition, expected renewal periods, the lifecycle of the our technology and other factors. While we believe that the estimates we have made are reasonable and appropriate, different assumptions and estimates could materially impact our reported financial results.
Professional Services and Other Revenue
Professional services and other revenue is primarily comprised of advisory services and training related to the deployment and optimization of our products. These services do not result in significant customization of our products. Professional services and other revenue is recognized as the services are performed.
Contracts with Multiple Performance Obligations
In cases where our contracts with customers contain multiple performance obligations, the contract transaction price is allocated on a relative standalone selling price basis. We typically determine standalone selling price based on observable selling prices of our products and services.
Variable Consideration
We record revenue from sales at the net sales price, which is the transaction price, including estimates of variable consideration when applicable. Certain of our customers may be entitled to receive credits and in certain circumstances, refunds, if service level commitments are not met. We have not historically experienced significant incidents affecting the ability to meet these service level commitments and any estimated refunds related to these agreements have not been material.
Sales through our channel network of distributors and resellers are generally discounted as compared to the price that we would sell to an end user. Revenue for sales through our channel network is recorded net of any distributor or reseller margin.
Concentrations
We sell our products and services through a channel network of distributors and resellers, along with our own sales teams. We derived 88%, 87%, 84% and 82% of revenue through our channel network in the three and nine months ended September 30, 2018 and 2017, respectively. One of our distributors accounted for 46%, 46%, 43% and 42% of revenue in the three and nine months ended September 30, 2018 and 2017, respectively. That same distributor accounted for 47% of accounts receivable at September 30, 2018.
Contract Balances
We generally bill our customers in advance and accounts receivable are recorded when we have the right to invoice the customer. Contract liabilities consist of deferred revenue and include customer billings and payments received in advance of performance under the contract. In the three and nine months ended September 30, 2018 and 2017, we recognized revenue of $62.5 million, $133.3 million, $43.6 million and $91.9 million, respectively, that was included in the deferred revenue balance at the beginning of each of the respective periods.
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Remaining Performance Obligations
At September 30, 2018, the future estimated revenue related to unsatisfied performance obligations was $267.9 million, with 72% expected to be recognized as revenue over the succeeding twelve months, and the remainder expected to be recognized over the four years thereafter.
Deferred Commissions
Sales commissions, including related incremental fringe benefit costs, are considered to be incremental costs of obtaining a contract. Sales commissions on initial sales are not commensurate with sales commissions on contract renewals and therefore are recognized over an estimated period of benefit, which ranges between three and four years for subscription arrangements and five years for perpetual license arrangements. We estimated the period of benefit based on the expected contract term including renewal periods, the lifecycle of our technology, and other factors. Sales commissions on contract renewals are capitalized and amortized ratably over the contract term, with the exception of contracts with renewal periods that are one year or less, in which case the incremental costs are expensed as incurred.
The following summarizes the activity of deferred incremental costs of obtaining a contract in the periods presented:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Beginning balance | $ | 50,805 |  |  | $ | 36,252 |  |  | $ | 50,176 |  |  | $ | 30,118 |
Capitalization of contract acquisition costs | 7,138 |  |  | 9,032 |  |  | 16,985 |  |  | 21,194 |
Amortization of deferred contract acquisition costs | (5,059 | ) |  | (3,891 | ) |  | (14,277 | ) |  | (9,919 | )
Ending balance | $ | 52,884 |  |  | $ | 41,393 |  |  | $ | 52,884 |  |  | $ | 41,393 |

Amortization of deferred contract acquisition costs is included in sales and marketing expense in the consolidated statements of operations and comprehensive loss.
Construction in Progress
In October 2017, we entered into a lease for our new corporate headquarters, which is currently being constructed in Columbia, Maryland. The lease has an anticipated start date in the third quarter of 2019 with a 12-year initial term and $68.2 million of lease payments. Under current accounting guidance for build-to-suit lease arrangements, we concluded that we are the deemed owner of the building during the construction period. Accordingly, we recorded a construction-in-progress asset of $23.5 million and $2.3 million, for which there is a corresponding construction financing obligation of $23.1 million and $1.8 million, in each case net of a $0.5 million deposit, recorded in the consolidated balance sheets at September 30, 2018 and December 31, 2017, respectively. We will continue to increase the construction-in-progress asset and corresponding financing obligation as additional building costs are incurred by the landlord during the construction period. Upon completion of the construction, we will evaluate whether or not this arrangement meets the criteria for sale-leaseback accounting treatment.
Recent Accounting Pronouncements Not Yet Adopted
In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02 - Leases (Topic 842), which will require, among other items, lessees to recognize a right-of-use asset and a lease liability for most leases. ASU 2016-02 will be effective for us beginning January 1, 2019, with early adoption permitted. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842), Targeted Improvements, which provides an adoption method that would allow companies to apply the new guidance to the financial statements in the period of adoption and thereafter, and not apply the new guidance to comparative periods presented. While we are evaluating the impact of this standard, including the adoption methodology, to determine the impact on our consolidated financial statements, we believe the most significant impact will be the recognition of a material right-of-use asset and lease liability for our facility leases.
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2. Fair Value Measurements
We measure certain financial instruments at fair value using a fair value hierarchy. In the hierarchy, assets are classified based on the lowest level inputs used in valuation into the following categories:

• | Level 1 — Quoted prices in active markets for identical assets and liabilities;

• | Level 2 — Observable inputs including quoted market prices for similar assets and liabilities in active markets, quoted prices for identical assets and liabilities in inactive markets, or inputs that are corroborated by observable market data; and

• | Level 3 — Unobservable inputs.

The following table summarizes assets that are measured at fair value on a recurring basis at September 30, 2018:

(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 119,718 |  |  | $ | — |  |  | $ | — |  |  | $ | 119,718 |
Short-term investments |  |  |  |  |  |  |
Commercial paper | $ | — |  |  | $ | 31,040 |  |  | $ | — |  |  | $ | 31,040 |
Corporate bonds | $ | — |  |  | $ | 3,085 |  |  | $ | — |  |  | $ | 3,085 |

We did not have any liabilities measured and recorded at fair value at September 30, 2018, and we did not have any assets or liabilities measured at fair value at December 31, 2017.
3. Property and Equipment, Net
Property and equipment, net consisted of the following:

(in thousands) | September 30, 2018 |  | December 31, 2017
Computer software and equipment | $ | 11,625 |  |  | $ | 9,089 |
Furniture and fixtures | 2,299 |  |  | 2,102 |
Leasehold improvements | 7,096 |  |  | 6,452 |
Equipment under capital leases | 1,843 |  |  | 1,839 |
Total | 22,863 |  |  | 19,482 |
Less: accumulated depreciation and amortization | (11,991 | ) |  | (8,728 | )
Property and equipment, net | $ | 10,872 |  |  | $ | 10,754 |

Depreciation and amortization related to property and equipment was $1.4 million, $4.1 million, $1.1 million and $2.9 million in the three and nine months ended September 30, 2018 and 2017, respectively.
4. Debt
On May 4, 2017, we entered into a $25.0 million revolving credit facility (“Credit Facility”) with Silicon Valley Bank, which is available for use until May 4, 2020. The Credit Facility is intended to be used to fund working capital and to provide increased liquidity and financial flexibility and bears interest at either LIBOR plus 2%, or the lender's prime rate plus 1%. In addition, we pay quarterly in arrears 0.25% of the average unused portion. The Credit Facility is secured by a first priority security interest in all of our assets, with a negative pledge on our Intellectual Property, as defined in the credit agreement.
The Credit Facility contains certain restrictive covenants customary for facilities of this type including restrictions on indebtedness, liens, acquisitions and investments, restricted payments and dispositions. If, as of the last day of any
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quarter, the outstanding balance of the Credit Facility exceeds $5.0 million, there are financial covenants that require us to maintain a minimum level of earnings before income taxes, interest, depreciation and amortization (“EBITDA”) adjusted to add changes in deferred revenue in the period, and a minimum current ratio level. There were no borrowings under the Credit Facility during the nine months ended September 30, 2018 or in 2017.
5. Commitments and Contingencies
Operating and Capital Leases
We have entered into various non-cancelable operating leases, primarily related to office real estate, that expire through 2022 and generally contain renewal options for up to five years. Rent expense was $1.4 million, $3.8 million, $1.0 million and $2.6 million in the three and nine months ended September 30, 2018 and 2017, respectively.
We also lease computer and office equipment under non-cancelable capital leases that expire through 2022. The total obligations for capital lease arrangements were $1.1 million and $1.5 million at September 30, 2018 and December 31, 2017, respectively.
Future minimum non-cancelable lease payments for operating and capital leases at September 30, 2018 were as follows:

(in thousands) |
Years ending December 31: |
2018 | $ | 1,404 |
2019 | 5,553 |
2020 | 4,197 |
2021 | 7,431 |
2022 | 6,183 |
Thereafter | 58,294 |
Total future minimum lease payments | $ | 83,062 |

Total future minimum lease payments at September 30, 2018 includes $68.2 million of future lease payments related to the lease of our new headquarters, which is currently being constructed in Columbia, Maryland. These lease payments are expected to commence in the first quarter of 2021.
6. Redeemable Convertible Preferred Stock
In October 2012, Tenable Inc. (now a wholly owned subsidiary of Tenable Holdings, Inc.) issued 15,847,500 shares of Series A redeemable convertible preferred stock. In December 2015, we issued 15,847,500 shares, par value of $0.01, of Series A redeemable convertible preferred stock ("Series A") in exchange for Series A redeemable convertible preferred stock of Tenable, Inc. in connection with a recapitalization. This exchange was made on a one for one basis. In addition, we authorized 42,000,000 shares and issued 39,538,354 shares, par value of $0.01, of Series B redeemable convertible preferred stock ("Series B"). Upon completion of our IPO, Series A and Series B (together, the “Redeemable Convertible Preferred Stock”) automatically converted into an aggregate of 55,385,854 shares of our common stock.
We accreted the Redeemable Convertible Preferred Stock to the redemption price at the redemption date using the effective interest method. Upon completion of our IPO, the accretion rights of the Redeemable Convertible Preferred Stock were terminated.
Upon the completion of our IPO, we filed an Amended and Restated Certificate of Incorporation, authorizing a total of 500,000,000 shares of common stock and 10,000,000 shares of preferred stock. At September 30, 2018, no shares of preferred stock were issued or outstanding.
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7. Stock-Based Compensation
We have various stock incentive plans under which we have issued stock-based awards. Stock options granted under our stock incentive plans have a maximum term of ten years, generally vest over a period of three to four years, and the exercise price cannot be less than the fair market value on the date of grant. Restricted stock units ("RSUs") granted under our stock incentive plans generally vest over a period of two to four years.
In the nine months ended September 30, 2018, our board of directors adopted, and our stockholders approved, our 2018 Equity Incentive Plan ("2018 Plan"), which reserves 9.9 million shares of our common stock that may be issued as stock-based awards. The 2018 Plan became effective upon the execution of the underwriting agreement related to our IPO, at which point no further grants were made under our 2016 Stock Incentive Plan ("2016 Plan"). Any shares subject to stock options or other stock awards granted under our 2016 Plan, 2012 Stock Incentive Plan or 2002 Stock Incentive Plan that would have otherwise returned to such plan (such as upon the expiration or termination of a stock award prior to vesting) were added to, and are available for issuance under, our 2018 Plan. There were 10,905,099 shares available for grant under the 2018 Plan at September 30, 2018.
Stock-based compensation expense included in the consolidated statements of operations and comprehensive loss was as follows:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Cost of revenue | $ | 692 |  |  | $ | 63 |  |  | $ | 883 |  |  | $ | 167 |
Sales and marketing | 2,707 |  |  | 409 |  |  | 3,984 |  |  | 1,037 |
Research and development | 2,427 |  |  | 510 |  |  | 3,594 |  |  | 1,356 |
General and administrative | 2,957 |  |  | 1,046 |  |  | 5,745 |  |  | 2,943 |
Total stock-based compensation expense | $ | 8,783 |  |  | $ | 2,028 |  |  | $ | 14,206 |  |  | $ | 5,503 |

At September 30, 2018, the total unrecognized stock-based compensation expense related to outstanding stock options was $52.9 million, which is expected to be recognized over an estimated remaining weighted average period of 3.2 years.
At September 30, 2018, the unrecognized stock-based compensation expense related to unvested awards of restricted stock was $3.8 million, which is expected to be recognized over an estimated remaining period of 2.3 years.
At September 30, 2018, the unrecognized stock-based compensation expense related to unvested restricted stock units was $15.9 million, which is expected to be recognized over an estimated remaining period of 2.3 years.
Stock Options
A summary of our stock option activity is presented below:

(in thousands, except for per share data and years) | Number of Shares |  | Weighted Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2017 | 14,573 |  | $ | 4.38 |  |  | 8.2 |  | $ | 77,020 |
Granted | 6,108 |  | 15.17 |  |  |  |  |  |
Exercised | (654) |  | 2.16 |  |  |  |  |  |
Forfeited/canceled | (640) |  | 6.81 |  |  |  |  |  |
Outstanding at September 30, 2018 | 19,387 |  | 7.77 |  |  | 8.2 |  | 603,127 |
Exercisable at September 30, 2018 | 5,855 |  | 3.55 |  |  | 6.7 |  | 206,850 |

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At September 30, 2018, there were 19.4 million stock options that were vested and expected to vest.
In the nine months ended September 30, 2018, we granted stock options to employees that vest over three to four years and had a weighted average grant date fair value of $6.84 per share. Estimating the fair value of stock options using the Black-Scholes option-pricing model requires assumptions as to the fair value of our underlying common stock, the estimated term of the option, the risk-free interest rate, the expected volatility of the price of our common stock, and the expected dividend yield. The fair value of each stock option was estimated on the grant date based on the following assumptions:

| Nine Months Ended September 30, 2018
Expected term (in years) | 6.3
Expected volatility | 41.3% — 43.3%
Risk-free interest rate | 2.7% — 2.9%
Expected dividend yield | —

Restricted Stock and Restricted Stock Units
A summary of our restricted stock and restricted stock units activity is presented below:

| Restricted Stock |  | Restricted Stock Units
(in thousands, except for per share data and years) | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2017 | 1,583 |  |  | $ | 4.25 |  |  | — |  |  | $ | — |
Granted | — |  |  | — |  |  | 1,097 |  |  | 17.82 |
Vested | (594) |  |  | 4.25 |  |  | — |  |  | — |
Forfeited | — |  |  | — |  |  | (47) |  |  | 16.22 |
Unvested balance at September 30, 2018 | 989 |  |  | 4.25 |  |  | 1,050 |  |  | 17.89 |

The grant date fair value was based on the estimated fair value of our common stock on the date of grant. RSUs granted before July 30, 2018 vest upon the satisfaction of both service-based and performance-based vesting conditions. The performance-based condition was satisfied upon the completion of our IPO. RSUs granted after July 30, 2018 vest upon the satisfaction of a service-based vesting condition.
Compensation expense for restricted stock and RSUs is recognized on a straight-line basis over the requisite service period, with the exception of RSUs that include performance-based vesting conditions, which are expensed using the accelerated attribution method.
2018 Employee Stock Purchase Plan
In the nine months ended September 30, 2018, our board of directors adopted, and our stockholders approved, our 2018 Employee Stock Purchase Plan ("2018 ESPP"). Our 2018 ESPP became effective upon the execution of the underwriting agreement related our IPO.
Under our 2018 ESPP, employees may set aside up to 15% of their gross earnings, on an after-tax basis, to purchase our common stock at a discounted price, which is calculated at 85% of the lower of the fair market value of our common stock on the first day of an offering or on the date of purchase. The 2018 ESPP permits offerings up to 27 months in duration, with one or more purchase periods in each offering. The initial offering period began on July 25, 2018 and is scheduled to end on September 1, 2020, with purchase periods ending on March 1, 2019, September 1, 2019, March 1, 2020 and September 1, 2020.
At September 30, 2018, there was $2.3 million of employee contributions to the 2018 ESPP included in accrued compensation, and no shares of our common stock have been purchased. The unrecognized stock-based compensation
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expense related to our 2018 ESPP was $9.9 million, which is expected to be recognized over the remaining offering period of 1.9 years.
8. Net Loss Per Share Attributable to Common Stockholders
The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands, except per share data) | 2018 |  | 2017 |  | 2018 |  | 2017
Net loss attributable to common stockholders | $ | (20,924 | ) |  | $ | (11,505 | ) |  | $ | (54,341 | ) |  | $ | (29,923 | )
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted | 74,261 |  |  | 22,679 |  |  | 40,688 |  |  | 22,004 |
Net loss per share attributable to common stockholders, basic and diluted | $ | (0.28 | ) |  | $ | (0.51 | ) |  | $ | (1.34 | ) |  | $ | (1.36 | )

The following potentially dilutive securities have been excluded from the diluted per share calculations because they would have been antidilutive:

| Three and Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017
Stock options | 19,387 |  |  | 13,826 |
Restricted stock units | 1,050 |  |  | — |
Restricted shares | 989 |  |  | 1,583 |
Shares to be issued under ESPP | 118 |  |  | — |
Redeemable convertible preferred stock | — |  |  | 55,386 |
Total | 21,544 |  |  | 70,795 |

9. Income Taxes
On December 22, 2017, the Tax Cuts and Jobs Act was enacted into law, which contains several significant changes, including reducing the corporate income tax rate from 35% to 21% effective January 1, 2018, imposing a one-time repatriation tax on accumulated foreign earnings (“transition tax”) and instituting the global intangible low taxed income (“GILTI”) regime and the base erosion anti-abuse tax.
We are following the guidance in Securities and Exchange Commission Staff Accounting Bulletin 118, which provides a company with the ability to record provisional amounts based on reasonable estimates that are subject to a measurement period of up to one year. At December 31, 2017, we made a reasonable estimate of the effects on existing deferred tax balances and the one-time transition tax. In the nine months ended September 30, 2018, no changes were made to these provisional amounts. We will continue to evaluate the transition tax obligation and application of GILTI and have not yet made an election with regard to GILTI. Subsequent adjustments resulting from additional analysis may be recorded when our analysis is completed in the fourth quarter of 2018.
10. Geographic Information
We operate as one operating segment. Our chief executive officer, who is our chief operating decision maker, reviews financial information on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance.
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Revenue by region, based on the address of the end user as specified in our subscription, license or service agreements, was as follows:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Americas | $ | 49,391 |  |  | $ | 36,408 |  |  | $ | 137,868 |  |  | $ | 99,974 |
Europe, Middle East and Africa | 14,002 |  |  | 8,781 |  |  | 38,218 |  |  | 23,611 |
Asia Pacific | 6,047 |  |  | 3,791 |  |  | 16,053 |  |  | 10,025 |
Revenue | $ | 69,440 |  |  | $ | 48,980 |  |  | $ | 192,139 |  |  | $ | 133,610 |

Customers located in the United States accounted for 66%, 67%, 70% and 70% of revenue in the three and nine months ended September 30, 2018 and 2017, respectively. No other country accounted for 10% or more of revenue in the periods presented.
Our property and equipment, net by geographic area is summarized as follows:

(in thousands) | September 30, 2018 |  | December 31, 2017
United States | $ | 6,822 |  |  | $ | 6,581 |
International | 4,050 |  |  | 4,173 |
Property and equipment, net | $ | 10,872 |  |  | $ | 10,754 |

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Item 2. 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 in conjunction with (1) our consolidated financial statements and related notes included elsewhere in this Quarterly Report on Form 10-Q, or this Form 10-Q, and (2) our consolidated financial statements, related notes and management's discussion and analysis of financial condition and results of operations in our final prospectus for our initial public offering, or IPO, dated as of July 25, 2018 and filed with the Securities and Exchange Commission pursuant to Rule 424(b)(4) of the Securities Act of 1933, as amended, or the Securities Act, on July 26, 2018, or the Prospectus.
This Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. These statements are often identified by the use of words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “project,” “will,” “would” or the negative or plural of these words or similar expressions or variations. Such forward-looking statements are subject to a number of risks, uncertainties, assumptions and other factors that could cause actual results and the timing of certain events to differ materially from future results expressed or implied by the forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those identified herein, and those discussed in the section titled “Risk Factors,” set forth in Part II, Item 1A of this Form 10-Q and in our other filings with the SEC. You should not rely upon forward-looking statements as predictions of future events. Furthermore, such forward-looking statements speak only as of the date of this report. Except as required by law, we undertake no obligation to update any forward-looking statements to reflect events or circumstances after the date of such statements.
Overview
We are the first and only provider of solutions for a new category of cybersecurity that we call Cyber Exposure. Cyber Exposure is a discipline for managing and measuring cybersecurity risk in the digital era. Our enterprise platform enables broad visibility into an organization’s cyber exposure across the modern attack surface and deep insights that help organizations translate vulnerability data into business insights to understand and reduce their cybersecurity risk.
Our enterprise platform offerings include Tenable.io and SecurityCenter. Tenable.io is our software as a service, or SaaS, offering that manages and measures cyber exposure across a range of traditional and modern IT assets. SecurityCenter was built to manage and measure cyber exposure across traditional IT assets and can be run on-premises, in the customer’s cloud or in a hybrid environment. We plan to release Tenable.io Lumin, an application that will provide enhanced risk-based prioritization of issues and benchmarking against industry peers and best-in-class performers.
Our enterprise platform offerings are primarily sold on a subscription basis with terms ranging from one to three years, primarily one year. These offerings are typically prepaid in advance. To a lesser extent, we generate ratably recognizable revenue from perpetual licenses and from the related ongoing maintenance.
Many of our enterprise platform customers initially use either our free or paid version of Nessus, one of the industry’s most widely deployed vulnerability assessment solutions. Nessus, which is the technology that underpins our enterprise platform offerings, is designed to quickly and accurately identify vulnerabilities, configuration and compliance issues and malware. Our free version of Nessus, Nessus Home, allows for vulnerability assessment over a limited number of IP addresses. We believe many of our Nessus customers begin with Nessus Home and subsequently upgrade to Nessus Professional, the paid version of Nessus; however, we expect many users to continue to use Nessus Home.
We have experienced rapid growth in recent years. Revenue in the three months ended September 30, 2018 and 2017 and the nine months ended September 30, 2018 and 2017 was $69.4 million, $49.0 million, $192.1 million and $133.6 million, respectively, representing year-over-year growth of 42% and 44% in the quarterly and year-to-date periods, respectively. Our net loss in the three months ended September 30, 2018 and 2017 and the nine months ended September 30, 2018 and 2017 was $20.9 million, $11.3 million, $53.9 million and $29.4 million, respectively, as we continue to invest in our business and market opportunity.
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Initial Public Offering
On July 30, 2018, we completed our IPO, in which we issued and sold 12,535,000 shares of common stock at the IPO price of $23.00 for net proceeds to us of $264.8 million, after underwriting discounts and commissions and other offering expenses. Upon the completion of our IPO, all 15,847,500 shares of our Series A Redeemable Convertible Preferred Stock, or Series A, and 39,538,354 shares of our Series B Redeemable Convertible Preferred Stock, or Series B, automatically converted into an aggregate of 55,385,854 shares of our common stock.
Financial Highlights
Below are our key financial results for the three and nine months ended September 30, 2018:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands, except per share data) | 2018 |  | 2017 |  | 2018 |  | 2017
Revenue | $ | 69,440 |  |  | $ | 48,980 |  |  | $ | 192,139 |  |  | $ | 133,610 |
Loss from operations | (21,096 | ) |  | (11,162 | ) |  | (52,990 | ) |  | (29,137 | )
Net loss | (20,869 | ) |  | (11,313 | ) |  | (53,907 | ) |  | (29,353 | )
Net loss per share attributable to common stockholders, basic and diluted | (0.28 | ) |  | (0.51 | ) |  | (1.34 | ) |  | (1.36 | )
Net cash used in operating activities | (1,751 | ) |  | (982 | ) |  | (1,005 | ) |  | (814 | )
Purchases of property and equipment | (1,162 | ) |  | (947 | ) |  | (4,140 | ) |  | (1,628 | )

Factors Affecting Our Performance
Product Leadership
We offer the first and only Cyber Exposure platform to provide visibility into the broadest range of traditional and modern IT assets across cloud and on-premises environments. We are intensely focused on continued innovation that empowers organizations to understand and reduce their cyber exposure. This includes ongoing development of our enterprise platform offerings. In February 2017, we released Tenable.io, our SaaS offering that is designed to provide broad visibility and insights across a broad range of traditional and modern IT assets and cloud environments. Throughout 2017, we introduced new features to Tenable.io, including web application scanning and container security.
We continue to expand the capabilities of our enterprise platform offerings, as well as our Nessus products, specifically as it relates to the ability to scan for and detect the rapidly expanding volume of vulnerabilities.
We intend to continue to invest in our engineering capabilities and marketing activities to maintain our position in the highly-competitive market for cybersecurity solutions. Our results of operations may fluctuate as we make these investments to drive increased customer adoption and usage.
New Enterprise Platform Customer Acquisition
We believe that our customer base provides a significant opportunity to expand sales of our enterprise platform offerings and that our ability to continue to grow our enterprise platform customers will increase future opportunities for renewals and follow-on sales. We believe that we have significant room to capture additional market share.
We expect to grow our enterprise platform customers by continuing to expand our sales organization and leveraging our channel partner network, which we believe will allow us to identify new enterprise customers, enter new markets, including internationally, as well as to convert more of our existing Nessus Professional customers to enterprise platform customers.
We have increased our sales and marketing headcount in recent years and we will continue to invest significantly in our partner network and sales and marketing capability in order to grow domestically and internationally.
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Retaining and Expanding Revenue from Existing Customers
Our enterprise platform offerings utilize IT asset-based or IP address-based pricing models. Once enterprise customers have licensed our platform offerings, they typically seek broader coverage over their traditional IT assets, including networking infrastructure, desktops and on-premises servers. As customers launch new applications or migrate existing applications to the cloud and deploy web applications, containers, internet of things, or IoT, and operational technology, or OT, they often increase the scope of their subscriptions and/or add additional perpetual licenses to our enterprise platforms.
We are also focused on upselling customers from Nessus Professional to our enterprise platform offerings. Nessus customers are typically organizations or independent security consultants that use Nessus for a single vulnerability assessment at a point in time. We seek to convert our Nessus Professional users to customers of our enterprise platform offerings, which provide continuous visibility and insights into their attack surface.
Further, we plan to expand existing platform capabilities and launch new products, such as Tenable.io Lumin, which we believe will drive new product purchases and follow-on purchases over time, thereby contributing to customer renewals. We believe that there is a significant opportunity to drive additional sales to existing customers, and we expect to invest in sales and marketing and customer success personnel and activities to achieve additional revenue growth from existing customers.
Our ability to increase sales to existing customers will depend on a number of factors, including satisfaction or dissatisfaction with our products and services, competition, pricing, economic conditions or overall changes in our spending levels.
Investing in Business Growth
Since our founding, we have invested significantly in growing our business. We intend to continue to invest in sales and marketing to grow our sales team, expand brand and Cyber Exposure awareness and optimize our channel partner network. We also intend to continue to invest in our research and development team to further our technological leadership position in Cyber Exposure and enhance the functionality of our solutions. Any investments we make in our sales and marketing and research and development teams will occur in advance of experiencing the benefits from such investments, so it may be difficult for us to determine if we are efficiently allocating resources in those areas. These investment activities could increase our net losses over the short term if our revenue growth does not increase at higher rates. However, we expect that these investments will benefit our results of operations.
Key Operating and Financial Metrics
To supplement our consolidated financial statements, which are prepared and presented in accordance with GAAP, we use certain operating metrics and non-GAAP financial measures, as described below, to understand and evaluate our core operating performance. These non-GAAP financial measures, which may be different than similarly titled measures used by other companies, are presented to enhance investors’ overall understanding of our financial performance and should not be considered a substitute for, or superior to, the financial information prepared and presented in accordance with GAAP.
We believe that these operating metrics and non-GAAP financial measures provide useful information about our operating and financial performance, enhance the overall understanding of our past performance and future prospects and allow for greater transparency with respect to important metrics used by management for financial and operational decision-making. We present these operating metrics and non-GAAP financial measures to assist investors in seeing our operating and financial performance using a management view and because we believe that these measures provide an additional tool for investors to use in comparing our core operating and financial performance over multiple periods with other companies in our industry.
Calculated Current Billings
We use the non-GAAP measure of calculated current billings, which we believe is a key metric to measure our periodic performance. Given that most of our customers pay in advance, we typically recognize a majority of the related revenue ratably over time. We use calculated current billings to measure and monitor our ability to provide our business with the working capital generated by upfront payments from our customers.
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Calculated current billings consists of revenue recognized in a period plus the change in current deferred revenue in the corresponding period. We believe that calculated current billings, which excludes deferred revenue for periods beyond twelve months in a customer’s contractual term, more closely correlates with annual contract value and that the variability in total billings, depending on the timing of large multi-year contracts and the preference for annual billing versus multi-year upfront billing, may distort growth in one period over another. While we believe that calculated current billings provides valuable insight into the cash that will be generated from sales of our subscriptions, this metric may vary from period-to-period for a number of reasons, and therefore has a number of limitations as a quarter-to-quarter or year-over-year comparative measure. For example, calculated current billings include amounts that have not yet been recognized as revenue; an increasing number of large sales transactions, for which the timing has and will continue to vary, may occur in quarters subsequent to or in advance of those that we anticipate; and our calculation of current billings may be different from other companies that report similar financial measures. Additionally, calculated current billings in any one period may be impacted by the timing of customer renewals, including early renewals, which could favorably or unfavorably impact year-over-year comparisons. Because of these and other limitations, you should consider calculated current billings along with revenue and our other GAAP financial results.
The following table presents a reconciliation of revenue, the most directly comparable financial measure calculated in accordance with GAAP, to calculated current billings:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Revenue | $ | 69,440 |  |  | $ | 48,980 |  |  | $ | 192,139 |  |  | $ | 133,610 |
Deferred revenue (current), end of period | 191,578 |  |  | 137,521 |  |  | 191,578 |  |  | 137,521 |
Deferred revenue (current), beginning of period(1) | (174,277 | ) |  | (122,190 | ) |  | (154,898 | ) |  | (107,006 | )
Calculated current billings | $ | 86,741 |  |  | $ | 64,311 |  |  | $ | 228,819 |  |  | $ | 164,125 |

_______________
(1) In connection with adopting ASC 606, we recorded $19.0 million of current deferred revenue on January 1, 2017, related to perpetual license revenue recognized in prior periods.
Free Cash Flow
We use the non-GAAP measure of free cash flow, which we define as GAAP net cash flows from operating activities reduced by purchases of property and equipment. We believe free cash flow is an important liquidity measure of the cash (if any) that is available, after purchases of property and equipment, for investment in our business and to make acquisitions. We believe that free cash flow is useful to investors as a liquidity measure because it measures our ability to generate or use cash.
Our use of free cash flow has limitations as an analytical tool and you should not consider it in isolation or as a substitute for an analysis of our results under GAAP. First, free cash flow is not a substitute for net cash used in operating activities. Second, other companies may calculate free cash flow or similarly titled non-GAAP financial measures differently or may use other measures to evaluate their performance, all of which could reduce the usefulness of free cash flow as a tool for comparison. Additionally, the utility of free cash flow is further limited as it does not reflect our future contractual commitments and does not represent the total increase or decrease in our cash balance for a given period. Because of these and other limitations, you should consider free cash flow along with our GAAP financial measures.
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The following table summarizes our cash flows for the periods presented and presents a reconciliation of net cash used in operating activities, the most directly comparable financial measure calculated in accordance with GAAP, to free cash flow:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Net cash used in operating activities | $ | (1,751 | ) |  | $ | (982 | ) |  | $ | (1,005 | ) |  | $ | (814 | )
Purchases of property and equipment | (1,162 | ) |  | (947 | ) |  | (4,140 | ) |  | (1,628 | )
Free cash flow(1) | $ | (2,913 | ) |  | $ | (1,929 | ) |  | $ | (5,145 | ) |  | $ | (2,442 | )

_______________
(1) Contributions to our employee stock purchase plan during the three and nine months ended September 30, 2018 contributed $2.3 million to free cash flow.
Enterprise Platform Customers
We believe that our customer base provides a significant opportunity to expand sales of our enterprise platform offerings. The following tables summarize key components of our customer base:

| Three Months Ended September 30, 2018
| 2018 |  | 2017 |  | Change (%)
Number of new enterprise platform customers added in period(1) | 258 |  | 264 |  | (2)%

_______________

(1) | We define an enterprise platform customer as a customer that has licensed Tenable.io or SecurityCenter for an annual amount of $5,000 or greater. New enterprise platform customers represent new customer logos during the periods presented and do not include customer conversions from Nessus Professional to enterprise platforms.

| At September 30,
| 2018 |  | 2017 |  | Change (%)
Number of customers with $100,000 and greater in annual contract value at end of period | 387 |  | 216 |  | 79%

Non-GAAP Loss from Operations and Non-GAAP Operating Margin
We use non-GAAP loss from operations, which excludes the effect of stock-based compensation and amortization of intangible assets, as a key indicator of our financial performance, along with non-GAAP operating margin, which is calculated as non-GAAP loss from operations divided by our revenue in the period. We believe that these non-GAAP financial measures provide useful information about our core operating results over multiple periods. There are a number of limitations related to the use of the non-GAAP financial measures as compared to GAAP loss from operations and operating margin, including that non-GAAP loss from operations and non-GAAP operating margin exclude stock-based compensation expense, which has been, and will continue to be for the foreseeable future, a significant recurring expense in our business and an important part of our compensation strategy.
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The following table presents a reconciliation of loss from operations, the most directly comparable financial measure calculated in accordance with GAAP, to non-GAAP loss from operations, and operating margin, the most directly comparable financial measure calculated in accordance with GAAP, to non-GAAP operating margin:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Loss from operations | $ | (21,096 | ) |  | $ | (11,162 | ) |  | $ | (52,990 | ) |  | $ | (29,137 | )
Stock-based compensation | 8,783 |  |  | 2,028 |  |  | 14,206 |  |  | 5,503 |
Amortization of intangible assets | 151 |  |  | 151 |  |  | 453 |  |  | 453 |
Non-GAAP loss from operations | $ | (12,162 | ) |  | $ | (8,983 | ) |  | $ | (38,331 | ) |  | $ | (23,181 | )
Operating margin | (30 | )% |  | (23 | )% |  | (28 | )% |  | (22 | )%
Non-GAAP operating margin | (18 | )% |  | (18 | )% |  | (20 | )% |  | (17 | )%

Non-GAAP Net Loss, Non-GAAP Net Loss Per Share and Pro Forma Non-GAAP Net Loss Per Share
We use non-GAAP net loss, which excludes the effect of the accretion of Series A and B redeemable convertible preferred stock, stock-based compensation and amortization of intangible assets, as well as the related tax impact, to calculate non-GAAP net loss per share and pro forma non-GAAP net loss per share. Pro forma non-GAAP net loss per share is calculated by giving effect to the conversion of our redeemable convertible preferred stock into common stock as though the conversion occurred at the beginning of each period presented. We believe that these non-GAAP measures provide important information to management and investors because they facilitate comparisons of our core operating results over multiple periods.
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The following table presents a reconciliation of net loss, and net loss per share attributable to common stockholders, the most comparable financial measures calculated in accordance with GAAP, to non-GAAP net loss, non-GAAP net loss per share and pro forma non-GAAP net loss per share:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands, except for per share amounts) | 2018 |  | 2017 |  | 2018 |  | 2017
Net loss attributable to common stockholders | $ | (20,924 | ) |  | $ | (11,505 | ) |  | $ | (54,341 | ) |  | $ | (29,923 | )
Accretion of Series A and B redeemable convertible preferred stock | 55 |  |  | 192 |  |  | 434 |  |  | 570 |
Stock-based compensation | 8,783 |  |  | 2,028 |  |  | 14,206 |  |  | 5,503 |
Tax impact of stock-based compensation(1) | (90 | ) |  | (13 | ) |  | (138 | ) |  | (35 | )
Amortization of intangible assets(1) | 151 |  |  | 151 |  |  | 453 |  |  | 453 |
Non-GAAP net loss | $ | (12,025 | ) |  | $ | (9,147 | ) |  | $ | (39,386 | ) |  | $ | (23,432 | )
Net loss per share attributable to common stockholders, basic and diluted | $ | (0.28 | ) |  | $ | (0.51 | ) |  | $ | (1.34 | ) |  | $ | (1.36 | )
Accretion of Series A and B redeemable convertible preferred stock | — |  |  | 0.01 |  |  | 0.01 |  |  | 0.03 |
Stock-based compensation | 0.12 |  |  | 0.09 |  |  | 0.35 |  |  | 0.25 |
Tax impact of stock-based compensation(1) | — |  |  | — |  |  | — |  |  | — |
Amortization of intangible assets(1) | — |  |  | 0.01 |  |  | 0.01 |  |  | 0.02 |
Non-GAAP net loss per share, basic and diluted | $ | (0.16 | ) |  | $ | (0.40 | ) |  | $ | (0.97 | ) |  | $ | (1.06 | )
Weighted-average shares used to compute net loss per share attributable to common stockholders and non-GAAP net loss per share, basic and diluted | 74,261 |  |  | 22,679 |  |  | 40,688 |  |  | 22,004 |
Pro forma adjustment to reflect the assumed conversion of our convertible redeemable preferred stock as of the beginning of the period | 14,449 |  |  | 55,386 |  |  | 41,590 |  |  | 55,386 |
Weighted-average shares used to compute pro forma non-GAAP net loss per share, basic and diluted | 88,710 |  |  | 78,065 |  |  | 82,278 |  |  | 77,390 |
Pro forma non-GAAP net loss per share, basic and diluted | $ | (0.14 | ) |  | $ | (0.12 | ) |  | $ | (0.48 | ) |  | $ | (0.30 | )

________________
(1) The tax impact of the adjustments to net loss attributable to common stockholders is based on the tax treatment for applicable tax jurisdictions. There was no tax impact related to the amortization of intangible assets as it was incurred in the United States in periods in which we had a net operating loss for which we maintained a full valuation allowance.
Components of Our Results of Operations
Revenue
We generate revenue from subscription arrangements for our software and cloud-based solutions, perpetual licenses, maintenance associated with perpetual licenses and professional services. We begin to recognize revenue when control of our software or services is transferred to the customer, which for sales made through distributors is concurrent with the transfer to the end user.
Our subscription arrangements generally have annual or multi-year contractual terms and allow customers to use our software or cloud-based solutions, including ongoing software updates during the contractual period. Revenue is recognized ratably over the subscription term given the critical utility provided by the ongoing updates that are released throughout the contract period.
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Our perpetual licenses are generally sold with one or more years of maintenance, which includes ongoing software updates. Given the critical utility provided by the ongoing software updates and updated ability to identify network vulnerabilities included in maintenance, we combine the perpetual license and the maintenance into a single performance obligation. Perpetual license arrangements generally contain a material right related to the customer’s ability to renew maintenance at a price that is less than the initial license fee. We apply a practical alternative to allocating a portion of the transaction price to the material right performance obligation and estimate a hypothetical transaction price which includes fees for expected maintenance renewals based on the estimated economic life of perpetual license contracts. We allocate the transaction price between the cybersecurity subscription provided in the initial contract and the material right related to expected contract renewals based on the hypothetical transaction price. We recognize the amount allocated to the combined license and maintenance performance obligation over the initial contractual period, which is generally one year. We recognize the amount allocated to the material right over the expected maintenance renewal period, which begins at the end of the initial contractual term and is generally four years. We have estimated the five-year economic life of perpetual license contracts based on historical contract attrition, expected renewal periods, the lifecycle of our technology and other factors. This estimate may change over time.
Professional services and other revenue is primarily comprised of advisory services and training related to the deployment and optimization of our products. These services do not result in significant customization of our products. Professional services and other revenue is recognized as the services are performed.
We have historically experienced, and expect in the future to experience, seasonality in entering into agreements with customers. We typically enter into a significantly higher percentage of agreements with new customers, as well as renewal agreements with existing customers, in the third and fourth quarters of the year. The increase in customer agreements in the third quarter is primarily attributable to U.S. government and related agencies, and the increase in the fourth quarter is primarily attributable to large enterprise account buying patterns typical in the software industry. Our recent growth and the ratable nature of our subscription revenue makes this seasonality less apparent in our overall financial results.
Cost of Revenue, Gross Profit and Gross Margin
Cost of revenue includes personnel costs related to our technical support group that provides assistance to customers, including salaries, benefits, bonuses, payroll taxes and stock-based compensation. Cost of revenue also includes hosting costs for Tenable.io, the costs related to professional services and training, depreciation and amortization and allocated overhead costs, which consist of information technology and facilities.
We intend to continue to invest additional resources in our cloud-based platform and our customer support team as we grow our business. The level and timing of investment in these areas could affect our cost of revenue in the future.
Gross profit, or revenue less cost of revenue, and gross margin, or gross profit as a percentage of revenue, have been and will continue to be affected by various factors, including the timing of our acquisition of new customers and our renewals of and follow-on sales to existing customers, the costs associated with operating our cloud-based platform, the extent to which we expand our customer support team and the extent to which we can increase the efficiency of our technology and infrastructure through technological improvements.
We expect our gross profit to increase in absolute dollars but our gross margin to decrease, as we expect revenue from our cloud-based subscriptions to increase as a percentage of revenue, although our gross margin could fluctuate from period to period depending on the interplay of all of these factors.
Operating Expenses
Sales and Marketing
Sales and marketing expense consists of personnel costs, sales commissions, marketing programs, travel and entertainment, expenses for conferences and events and allocated overhead costs.
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We intend to continue to make significant investments in our sales and marketing teams to grow revenue, further penetrate the market and expand our global customer base. We expect our sales and marketing expense to continue to increase in absolute dollars and to be our largest operating expense category for the foreseeable future. However, as our revenue increases, we expect our sales and marketing expense to decrease as a percentage of our revenue over the long term, although our sales and marketing expense may fluctuate as a percentage of our revenue from period to period due to the timing and extent of these expenses.
Research and Development
Research and development expense consists of personnel costs, software used to develop our products, travel and entertainment, consulting and professional fees for third-party development resources as well as allocated overhead. Our research and development expense supports our efforts to continue to add capabilities to our existing products and enable the continued detection of new network vulnerabilities.
We expect our research and development expense to continue to increase in absolute dollars for the foreseeable future, particularly in 2018, as we continue to invest in research and development efforts to enhance the functionality of our cloud-based platform. However, we expect our research and development expense to decrease as a percentage of our revenue over the long term, although our research and development expense may fluctuate as a percentage of our revenue from period to period due to the timing and extent of these expenses.
General and Administrative
General and administrative expense consists of personnel costs for our executive, finance, legal, human resources and administrative departments. Additional expenses include travel and entertainment, professional fees, insurance and allocated overhead.
We expect our general and administrative expense to continue to increase in absolute dollars for the foreseeable future, in particular in 2018, due to additional costs associated with accounting, compliance, insurance and investor relations as a public company. However, we expect our general and administrative expense to decrease as a percentage of our revenue over the long term, although our general and administrative expense may fluctuate as a percentage of our revenue from period to period due to the timing and extent of these expenses.
Other Income (Expense), Net
Other income (expense), net consists primarily of interest income earned on cash and cash equivalents and short-term investments, net foreign currency remeasurement and transaction gains and losses and interest expense in connection with unused line of credit fees on our revolving credit facility.
Provision for Income Taxes
Provision for income taxes consists primarily of income taxes in certain foreign jurisdictions in which we conduct business. We have recorded deferred tax assets for which a full valuation allowance has been provided, including net operating loss carryforwards and tax credits. We expect to maintain this full valuation allowance for the foreseeable future as it is more likely than not that some or all of those deferred tax assets may not be realized based on our history of losses.
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Results of Operations
The following tables set forth our consolidated results of operations for the periods presented:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Revenue | $ | 69,440 |  |  | $ | 48,980 |  |  | $ | 192,139 |  |  | $ | 133,610 |
Cost of revenue(1) | 12,161 |  |  | 7,424 |  |  | 30,768 |  |  | 17,210 |
Gross profit | 57,279 |  |  | 41,556 |  |  | 161,371 |  |  | 116,400 |
Operating expenses: |  |  |  |  |  |  |
Sales and marketing(1) | 44,550 |  |  | 29,574 |  |  | 125,964 |  |  | 83,515 |
Research and development(1) | 20,553 |  |  | 15,869 |  |  | 55,529 |  |  | 42,040 |
General and administrative(1) | 13,272 |  |  | 7,275 |  |  | 32,868 |  |  | 19,982 |
Total operating expenses | 78,375 |  |  | 52,718 |  |  | 214,361 |  |  | 145,537 |
Loss from operations | (21,096 | ) |  | (11,162 | ) |  | (52,990 | ) |  | (29,137 | )
Other income (expense), net | 709 |  |  | (92 | ) |  | 240 |  |  | (65 | )
Loss before income taxes | (20,387 | ) |  | (11,254 | ) |  | (52,750 | ) |  | (29,202 | )
Provision for income taxes | 482 |  |  | 59 |  |  | 1,157 |  |  | 151 |
Net loss and comprehensive loss | $ | (20,869 | ) |  | $ | (11,313 | ) |  | $ | (53,907 | ) |  | $ | (29,353 | )

_______________
(1) Includes stock-based compensation expense as follows:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Cost of revenue | $ | 692 |  |  | $ | 63 |  |  | $ | 883 |  |  | $ | 167 |
Sales and marketing | 2,707 |  |  | 409 |  |  | 3,984 |  |  | 1,037 |
Research and development | 2,427 |  |  | 510 |  |  | 3,594 |  |  | 1,356 |
General and administrative | 2,957 |  |  | 1,046 |  |  | 5,745 |  |  | 2,943 |
Total stock-based compensation expense | $ | 8,783 |  |  | $ | 2,028 |  |  | $ | 14,206 |  |  | $ | 5,503 |

Comparison of the Three Months Ended September 30, 2018 and 2017
Revenue

| Three Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | ($) |  | (%)
Revenue | $ | 69,440 |  |  | $ | 48,980 |  |  | $ | 20,460 |  |  | 42 | %

The increase in revenue of $20.5 million was comprised of increases in subscription revenue of $18.6 million, perpetual license and maintenance revenue of $1.0 million and professional services and other revenue of $0.9 million. Revenue from existing customers comprised 42% of the increase, while the remaining increase was due to revenue from new customers since October 1, 2017. International revenue increased $8.7 million, or 59%.
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Cost of Revenue, Gross Profit and Gross Margin

| Three Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | ($) |  | (%)
Cost of revenue | $ | 12,161 |  |  | $ | 7,424 |  |  | $ | 4,737 |  |  | 64 | %
Gross profit | 57,279 |  |  | 41,556 |  |  | 15,723 |  |  | 38 | %
Gross margin | 82 | % |  | 85 | % |  |  |  |  |

The increase in cost of revenue of $4.7 million was primarily due to:

• | a $2.0 million increase in personnel costs primarily due to increased headcount;

• | a $1.0 million increase in allocated overhead costs driven by both the increase in headcount and the overall increase in such costs on a year-over-year basis;

• | a $0.9 million increase in third-party cloud infrastructure costs largely associated with the increased adoption of Tenable.io;

• | a $0.4 million increase in professional fees; and

• | a $0.2 million increase in software subscription expenses.

Operating Expenses
Sales and Marketing

| Three Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | ($) |  | (%)
Sales and marketing | $ | 44,550 |  |  | $ | 29,574 |  |  | $ | 14,976 |  |  | 51 | %

The increase in sales and marketing expense of $15.0 million was primarily due to:

• | a $7.9 million increase in personnel costs largely associated with an increase in headcount;

• | a $3.6 million increase in sales commissions, including sales commission draws, due to increased sales and the amortization of deferred commissions;

• | a $1.4 million increase in expenses for demand generation programs, including advertising, sponsorships and brand awareness efforts aimed at acquiring new customers; and

• | a $1.4 million increase in selling expenses, including travel and meeting costs and the costs of software subscriptions.

Research and Development

| Three Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | ($) |  | (%)
Research and development | $ | 20,553 |  |  | $ | 15,869 |  |  | $ | 4,684 |  |  | 30 | %

The increase in research and development expense of $4.7 million was primarily due to:

• | a $4.1 million increase in personnel costs largely associated with an increase in headcount, net of $0.6 million of development costs capitalized related to internal use software;

• | a $0.3 million increase in third-party cloud infrastructure costs related to the development of new and future offerings; and

• | a $0.1 million increase in allocated overhead driven by both the increase in headcount and the overall increase in such costs on a year-over-year basis.

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General and Administrative

| Three Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | ($) |  | (%)
General and administrative | $ | 13,272 |  |  | $ | 7,275 |  |  | $ | 5,997 |  |  | 82 | %

The increase in general and administrative expense of $6.0 million was primarily due to:

• | a $4.3 million increase in personnel costs largely associated with an increase in headcount;

• | a $0.9 million increase in professional fees; and

• | a $0.2 million increase in software subscription expense.

Comparison of the Nine Months Ended September 30, 2018 and 2017
Revenue

| Nine Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | ($) |  | (%)
Revenue | $ | 192,139 |  |  | $ | 133,610 |  |  | $ | 58,529 |  |  | 44 | %

The increase in revenue of $58.5 million was comprised of increases in subscription revenue of $53.1 million, perpetual license and maintenance revenue of $3.6 million and professional services and other revenue of $1.8 million. Revenue from existing customers comprised 57% of the increase, while the remaining increase was due to revenue from new customers since October 1, 2017. International revenue increased $24.1 million, or 61%.
Cost of Revenue, Gross Profit and Gross Margin

| Nine Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | Change ($) |  | (%)
Cost of revenue | $ | 30,768 |  |  | $ | 17,210 |  |  | $ | 13,558 |  |  | 79 | %
Gross profit | 161,371 |  |  | 116,400 |  |  | 44,971 |  |  | 39 | %
Gross margin | 84 | % |  | 87 | % |  |  |  |  |

The increase in cost of revenue of $13.6 million was primarily due to:

• | a $5.0 million increase in third-party cloud infrastructure costs largely associated with the increased adoption of Tenable.io;

• | a $4.8 million increase in personnel costs primarily due to increased headcount;

• | a $2.2 million increase in allocated overhead costs driven by both the increase in headcount and the overall increase in such costs on a year-over-year basis;

• | a $0.4 million increase in software subscription expenses; and

• | a $0.4 million increase in depreciation and amortization.

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Operating Expenses
Sales and Marketing

| Nine Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | ($) |  | (%)
Sales and marketing | $ | 125,964 |  |  | $ | 83,515 |  |  | $ | 42,449 |  |  | 51 | %

The increase in sales and marketing expense of $42.4 million was primarily due to:

• | a $20.1 million increase in personnel costs largely associated with an increase in headcount;

• | a $10.7 million increase in sales commissions, including sales commission draws, due to increased sales and the amortization of deferred commissions;

• | a $5.9 million increase in expenses for demand generation programs, including advertising, sponsorships and brand awareness efforts aimed at acquiring new customers;

• | a $4.2 million increase in selling expenses, including travel and meeting costs and the costs of software subscriptions; and

• | a $1.1 million increase in allocated overhead costs, driven by both the increase in headcount and the overall increase in such costs on a year-over-year basis.

Research and Development

| Nine Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | ($) |  | (%)
Research and development | $ | 55,529 |  |  | $ | 42,040 |  |  | $ | 13,489 |  |  | 32 | %

The increase in research and development expense of $13.5 million was primarily due to:

• | a $10.6 million increase in personnel costs largely associated with an increase in headcount, net of $1.5 million of development costs capitalized related to internal use software;

• | a $1.0 million increase in third-party cloud infrastructure costs related to the development of new and future offerings;

• | a $0.5 million increase in event and travel costs;

• | a $0.5 million increase in software subscription expenses; and

• | a $0.5 million in allocated overhead driven by both the increase in headcount and the overall increase in such costs on a year-over-year basis.

General and Administrative

| Nine Months Ended September 30, |  | Change
(dollars in thousands) | 2018 |  | 2017 |  | ($) |  | (%)
General and administrative | $ | 32,868 |  |  | $ | 19,982 |  |  | $ | 12,886 |  |  | 64 | %

The increase in general and administrative expense of $12.9 million was primarily due to:

• | a $8.0 million increase in personnel costs largely associated with an increase in headcount;

• | a $2.9 million increase in professional fees;

• | a $0.6 million increase in software subscription expense;

• | a $0.3 million increase in depreciation and amortization; and

• | a $0.2 million increase in allocated overhead driven by both the increase in headcount and the overall increase in such costs on a year-over-year basis.

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Liquidity and Capital Resources
At September 30, 2018, we had cash and cash equivalents consisting of bank deposits and money market funds of $253.0 million and short-term investments consisting of commercial paper and corporate bonds of $34.1 million. Upon the completion of our IPO in July 2018, we received net proceeds of $264.8 million.
Since our inception and prior to our IPO, we financed our operations through cash provided by operations, including payments received from customers using our software products and services, and we did not raise any primary institutional capital prior to our IPO. The proceeds of our Series A and Series B redeemable convertible preferred stock financings were used to repurchase shares of capital stock from former stockholders. We have generated significant operating losses from our operations as reflected by our accumulated deficit of $446.5 million at September 30, 2018.
We typically invoice our customers annually in advance and, to a lesser extent, multi-year in advance. Therefore, a substantial source of our cash is from such prepayments, which are included on our consolidated balance sheets as deferred revenue. Deferred revenue consists primarily of the unearned portion of billed fees for our subscriptions and perpetual licenses, which is subsequently recognized as revenue in accordance with our revenue recognition policy. At September 30, 2018, we had deferred revenue of $265.7 million, of which $191.6 million was recorded as a current liability and is expected to be recorded as revenue in the next 12 months, provided all other revenue recognition criteria are met.
Our principal uses of cash in recent periods have been funding our operations, expansion of our sales and marketing and research and development activities and investments in infrastructure. We expect to continue incurring operating losses and generating negative cash flows from operations in the near-term; however, we believe that our existing cash and cash equivalents, including cash proceeds from our IPO, together with amounts available under the revolving credit facility, will be sufficient to fund our operating and capital needs for at least the next 12 months. Our future capital requirements will depend on many factors, including our revenue growth rate, subscription renewal activity, the timing and extent of spending to support further infrastructure and research and development efforts, the timing and extent of additional capital expenditures to invest in new and existing office spaces, such as our new corporate headquarters, the expansion of sales and marketing and international operating activities, the timing of introduction of new product capabilities and enhancements of our platform and the continuing market acceptance of our platform.
We may in the future enter into arrangements to acquire or invest in complementary businesses, services and technologies, including intellectual property rights. We may be required to seek equity or debt financing. In the event that financing is required from outside sources, we may not be able to raise it on terms acceptable to us or at all. If we are unable to raise additional capital when desired, or if we cannot expand our operations or otherwise capitalize on our business opportunities because we lack sufficient capital, our business, operating results and financial condition would be adversely affected.
Credit Facility
In May 2017, we entered into a $25.0 million revolving credit facility with Silicon Valley Bank. Pursuant to the terms of the revolving credit facility, we may issue up to $5.0 million of letters of credit, which reduce the total amount available for borrowing under such facility. The revolving credit facility terminates on May 4, 2020. To date, we have not borrowed any amounts under the revolving credit facility.
Interest on borrowings under the revolving credit facility accrues at a variable rate tied to the prime rate or the LIBOR rate, at our election. Interest is payable quarterly in arrears. We are required to pay a quarterly commitment fee that accrues at a rate of 0.25% per annum on the unused portion of the borrowing commitment.
The revolving credit facility contains customary conditions to borrowing, events of default and covenants, including restrictions on indebtedness, liens, acquisitions and investments, restricted payments and dispositions. If, as of the last day of any quarter, the outstanding balance of the revolving credit facility exceeds $5.0 million, there are financial covenants that require us to maintain a minimum level of earnings before income taxes, interest, depreciation and amortization adjusted to add changes in deferred revenue in the period and a minimum current ratio level. We were in compliance with all covenants under the revolving credit facility at September 30, 2018.
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Cash Flows
The following table summarizes our cash flows for the periods presented:

| Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017
Net cash used in operating activities | $ | (1,005 | ) |  | $ | (814 | )
Net cash used in investing activities | (38,254 | ) |  | (1,628 | )
Net cash provided by financing activities | 265,750 |  |  | 2,051 |
Effect of exchange rate changes on cash and cash equivalents and restricted cash | (675 | ) |  | 22 |
Net increase (decrease) in cash and cash equivalents and restricted cash | $ | 225,816 |  |  | $ | (369 | )

Operating Activities
In the nine months ended September 30, 2018, net cash used in operating activities was $1.0 million, which primarily consisted of our $53.9 million loss, adjusted for stock-based compensation expense of $14.2 million and depreciation and amortization of $4.6 million, as well as a net cash inflow of $33.3 million from changes in operating assets and liabilities. The net inflow from changes in operating assets and liabilities was primarily due to a $39.9 million increase in deferred revenue primarily due to increased subscription sales as a majority of our customers are invoiced in advance, partially offset by an $8.2 million increase in accounts receivable.
In the nine months ended September 30, 2017, net cash used in operating activities was $0.8 million, which primarily consisted of our $29.4 million loss, adjusted for stock-based compensation expense of $5.5 million and depreciation and amortization of $3.3 million, as well as a net cash inflow of $19.2 million from changes in operating assets and liabilities. The net inflow from changes in operating assets and liabilities was primarily due to a $40.1 million increase in deferred revenue from increased subscription sales, partially offset by an $11.3 million increase in deferred commissions and an $8.4 million increase in accounts receivable.
Investing Activities
Net cash used in investing activities increased by $36.6 million, primarily due to our purchase of short-term investments of commercial paper and corporate bonds.
Financing Activities
Net cash provided by financing activities increased by $263.7 million, primarily due to proceeds from our IPO, net of underwriting discounts and commissions, of $268.5 million, less payments of offering costs related to our IPO of $3.7 million.
Contractual Obligations
At September 30, 2018, there were no material changes in our contractual obligations and commitments from those disclosed in our Prospectus.
Off-Balance Sheet Arrangements
At September 30, 2018, we did not have any relationships with unconsolidated organizations or financial partnerships, such as structured finance or special purpose entities, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.
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Critical Accounting Policies and Estimates
Our financial statements are prepared in accordance with U.S. GAAP. The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses, as well as related disclosures. We evaluate our estimates and assumptions on an ongoing basis. Our estimates are based on historical experience and various other assumptions that we believe to be reasonable under the circumstances. Our actual results could differ from these estimates.
There have been no material changes to our critical accounting policies and estimates as described in our Prospectus.
Recently Issued Accounting Pronouncements
Refer to Note 1 to our consolidated financial statements for more information regarding recently issued accounting pronouncements not yet adopted.
Emerging Growth Company Status
We are an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act. Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards until such time as those standards apply to private companies. We have irrevocably elected not to avail ourselves of this exemption from new or revised accounting standards and, therefore, we will be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies.
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Item 3. Quantitative and Qualitative Disclosures about Market Risk
We are exposed to market risks in the ordinary course of our business, including interest rate, foreign currency exchange and inflation risks.
Interest Rate Risk
At September 30, 2018, we had cash and cash equivalents of $253.0 million, consisting of cash deposits and money market funds. We also had short-term investments of $34.1 million, consisting of commercial paper and corporate bonds. Our investments are carried at their fair market value with cumulative unrealized gains or losses recorded as a component of accumulated other comprehensive loss within stockholders' equity. The primary objectives of our investment activities are the preservation of capital, the fulfillment of liquidity needs and the fiduciary control of cash and investments. We do not enter into investments for trading or speculative purposes. Interest-earning instruments carry a degree of interest rate risk; however, a hypothetical 10% change in interest rates during any of the periods presented would not have had a material impact on our financial statements.
We have not had any amounts outstanding under the revolving credit facility since it was established in May 2017. Any borrowings under the revolving credit facility would bear interest at a variable rate tied to the prime rate or the LIBOR rate. We do not have any other long-term debt or financial liabilities with floating interest rates that would subject us to interest rate fluctuations.
Foreign Currency Exchange Risk
Substantially all of our sales contracts are denominated in U.S. dollars, with a limited number of contracts denominated in foreign currencies. A portion of our operating expenses are incurred outside the United States, denominated in foreign currencies and subject to fluctuations due to changes in foreign currency exchange rates, particularly changes in the Euro, British Pound and Australian dollar. Additionally, fluctuations in foreign currency exchange rates may cause us to recognize remeasurement and transaction gains (losses) in our consolidated statements of operations and comprehensive loss. As the impact of foreign currency exchange rates has not been material to our historical operating results, we have not entered into derivative or hedging transactions, but we may do so in the future if our exposure to foreign currency becomes more significant.
Inflation Risk
We do not believe that inflation has had a material effect on our business, results of operations, or financial condition. Nonetheless, if our costs were to become subject to significant inflationary pressures, we may not be able to fully offset such higher costs. Our inability or failure to do so could harm our business, results of operations, or financial condition.
Item 4. Controls and Procedures
Evaluation of Disclosure Controls and Procedures
We maintain “disclosure controls and procedures,” as defined in Rule 13a-15(e) and Rule 15d-15(e) under the Exchange Act that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to our management, including our principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure.
Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act ), as of the end of the period covered by this Form 10-Q. Based on such evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that as of September 30, 2018, our disclosure controls and procedures were effective to provide reasonable assurance that the information required to be disclosed by us in this Form 10-Q was (a)
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reported within the time periods specified by SEC rules and regulations, and (b) communicated to our management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding any required disclosure.
Changes in Internal Control Over Financial Reporting
There were no changes in our internal control over financial reporting identified in management’s evaluation pursuant to Rules 13a-15(d) or 15d-15(d) of the Exchange Act during the period covered by this Quarterly Report on Form 10-Q that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.
Inherent Limitations on Effectiveness of Internal Controls
In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable, not absolute, assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints and that management is required to apply judgment in evaluating the benefits of possible controls and procedures relative to their costs. Our management, including our Chief Executive Officer and Chief Financial Officer, believes that our disclosure controls and procedures and internal control over financial reporting are designed to provide reasonable assurance of achieving their objectives and are effective at the reasonable assurance level. However, our management does not expect that our disclosure controls and procedures or our internal control over financial reporting will prevent all errors and all fraud.
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PART II. OTHER INFORMATION
Item 1. Legal Proceedings
From time to time, we may be subject to legal proceedings and claims in the ordinary course of business. We are not presently a party to any legal proceedings that, if determined adversely to us, would individually or taken together have a material adverse effect on our business, results of operations, financial condition or cash flows. We have received, and may in the future continue to receive, claims from third parties asserting, among other things, infringement of their intellectual property rights. Future litigation may be necessary to defend ourselves, our partners and our customers by determining the scope, enforceability and validity of third-party proprietary rights, or to establish our proprietary rights. The results of any current or future litigation cannot be predicted with certainty, and regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors.
Item 1A. Risk Factors
Our operations and financial results are subject to significant risks and uncertainties including those described below. You should carefully consider the risks and uncertainties described below, in addition to other information contained in this Quarterly Report on Form 10-Q, including our consolidated financial statements and related notes. The risks and uncertainties described below are not the only ones we face. Additional risks and uncertainties that we are unaware of, or that we currently believe are not material, may also become important factors that adversely affect our business. If any of the following risks or others not specified below materialize, our business, financial condition and results of operations could be materially and adversely affected.
Risks Related to Our Business and Industry
We have a history of losses and may not achieve or maintain profitability in the future.
We have historically incurred net losses, including net losses of $37.2 million, $41.0 million and $53.9 million in 2016, 2017 and the nine months ended September 30, 2018, respectively. As of September 30, 2018, we had an accumulated deficit of $446.5 million. Because the market for our offerings is highly competitive and rapidly evolving and these solutions have not yet reached widespread adoption, it is difficult for us to predict our future results of operations. While we have experienced significant revenue growth in recent periods, we are not certain whether or when we will obtain a high enough volume of sales of our offerings to sustain or increase our growth or achieve or maintain profitability in the future. We also expect our costs to increase in future periods, which could negatively affect our future operating results if our revenue does not increase at a greater rate. In particular, we expect to continue to expend substantial financial and other resources on:

• | research and development related to our offerings, including investments in our research and development team;

• | sales and marketing, including a significant expansion of our sales organization, both domestically and internationally;

• | continued international expansion of our business; and

• | general and administrative expense, including legal and accounting expenses related to being a public company.

These investments may not result in increased revenue or growth in our business. If we are unable to increase our revenue at a rate sufficient to offset the expected increase in our costs, our business, financial position and results of operations will be harmed and we may not be able to achieve or maintain profitability over the long term. Additionally, we may encounter unforeseen operating expenses, difficulties, complications, delays and other unknown factors that may result in losses in future periods. If our revenue growth does not meet our expectations in future periods, our financial performance may be harmed, and we may not achieve or maintain profitability in the future.
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We may not be able to sustain our revenue growth rate in the future.
From 2016 to 2017, our revenue grew from $124.4 million to $187.7 million, representing year-over-year growth of 51%. Our adoption of ASC 606 as of January 1, 2017 contributed three percentage points to that growth rate. From the nine months ended September 30, 2017 to the nine months ended September 30, 2018, our revenue grew from $133.6 million to $192.1 million. This growth was primarily from an increase in subscription revenue. Although we have experienced rapid growth historically and currently have high customer renewal rates, we may not continue to grow as rapidly in the future due to a decline in our renewal rates, failure to attract new customers or other factors. Any success that we may experience in the future will depend in large part on our ability to, among other things:

• | maintain and expand our customer base;

• | increase revenue from existing customers through increased or broader use of our offerings within their organizations;

• | improve the performance and capabilities of our offerings through research and development;

• | continue to develop and expand our enterprise platform;

• | maintain the rate at which customers purchase and renew subscriptions to our enterprise platform offerings;

• | continue to successfully expand our business domestically and internationally; and

• | successfully compete with other companies.

If we are unable to maintain consistent revenue or revenue growth, our stock price could be volatile, and it may be difficult to achieve and maintain profitability. You should not rely on our revenue for any prior quarterly or annual periods as any indication of our future revenue or revenue growth.
We may be unable to rapidly and efficiently adjust our cost structure in response to significant revenue declines, which could adversely affect our operating results.
We recognize substantially all of our revenue ratably over the term of our subscriptions and, to a lesser extent, perpetual licenses ratably over an expected period of benefit and, as a result, downturns in sales may not be immediately reflected in our operating results.
We recognize substantially all of our revenue ratably over the terms of our subscriptions with customers, which generally occurs over a one-year period and, for our perpetual licenses, over a five-year expected period of benefit. As a result, a substantial portion of the revenue that we report in each period will be derived from the recognition of deferred revenue relating to agreements entered into during previous periods. Consequently, a decline in new sales or renewals in any one period may not be immediately reflected in our revenue results for that period. This decline, however, will negatively affect our revenue in future periods. Accordingly, the effect of significant downturns in sales and market acceptance of our solutions and potential changes in our rate of renewals may not be fully reflected in our results of operations until future periods. This also makes it difficult for us to rapidly increase our revenue growth through additional sales in any period, as revenue from new customers generally will be recognized over the term of the applicable agreement.
We may not be able to scale our business quickly enough to meet our customers’ growing needs.
As usage of our enterprise platform grows, and as customers expand in size or expand the number of IT assets or IP addresses under their subscriptions, we may need to devote additional resources to improving our technology architecture, integrating with third-party systems and maintaining infrastructure performance. In addition, we will need to appropriately scale our sales and marketing headcount, as well as grow our third-party channel partner network, to serve our growing customer base. If we are unable to scale our business appropriately, it could reduce the attractiveness of our solutions to customers, resulting in decreased sales to new customers, lower renewal rates by existing customers or the issuance of service credits or requested refunds, each of which could hurt our revenue growth and our reputation. Even if we are able to upgrade our systems and expand our personnel, any such expansion will be expensive and complex, requiring management time and attention. We could also face inefficiencies or operational failures as a result of our efforts to scale our infrastructure. Moreover, there are inherent risks associated with upgrading, improving and expanding our information technology systems. We cannot be sure that the expansion and improvements to our infrastructure and systems will be fully or effectively implemented on a timely basis, if at all. These efforts may reduce revenue and our margins and adversely impact our financial results.
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If our enterprise platform offerings do not interoperate with our customers’ network and security infrastructure or with third-party products, websites or services, our results of operations may be harmed.
Our enterprise platform offerings, Tenable.io and SecurityCenter, must interoperate with our customers’ existing network and security infrastructure. These complex systems are developed, delivered and maintained by the customer and a myriad of vendors and service providers. As a result, the components of our customers’ infrastructure have different specifications, rapidly evolve, utilize multiple protocol standards, include multiple versions and generations of products and may be highly customized. We must be able to interoperate and provide our security offerings to customers with highly complex and customized networks, which requires careful planning and execution between our customers, our customer support teams and our channel partners. Further, when new or updated elements of our customers’ infrastructure or new industry standards or protocols, such as HTTP/2, are introduced, we may have to update or enhance our cloud platform and our other solutions to allow us to continue to provide service to customers. Our competitors or other vendors may refuse to work with us to allow their products to interoperate with our solutions, which could make it difficult for our cloud platform to function properly in customer networks that include these third-party products.
We may not deliver or maintain interoperability quickly or cost-effectively, or at all. These efforts require capital investment and engineering resources. If we fail to maintain compatibility of our cloud platform and our other solutions with our customers’ network and security infrastructures, our customers may not be able to fully utilize our solutions, and we may, among other consequences, lose or fail to increase our market share and experience reduced demand for our services, which would materially harm our business, operating results and financial condition.
If our solutions fail to detect vulnerabilities or incorrectly detect vulnerabilities, or if they contain undetected errors or defects, our brand and reputation could be harmed.
If our solutions fail to detect vulnerabilities in our customers’ cybersecurity infrastructure, or if our solutions fail to identify to new and increasingly complex methods of cyberattacks, our business and reputation may suffer. There is no guarantee that our solutions will detect all vulnerabilities, especially in light of the rapidly changing security landscape to which we must respond. Additionally, our solutions may falsely detect vulnerabilities or threats that do not actually exist. For example, our solutions rely on information provided by an active community of users who contribute new exploits, attacks and vulnerabilities. If the information from these third parties is inaccurate, the potential for false indications of security vulnerabilities increases. These false positives, while typical in the industry, may impair the perceived reliability of our offerings and may therefore adversely impact market acceptance of our products and could result in negative publicity, loss of customers and sales and increased costs to remedy any problem.
Our solutions may also contain undetected errors or defects when first introduced or as new versions are released. We have experienced these errors or defects in the past in connection with new solutions and product upgrades and we expect that these errors or defects will be found from time to time in the future in new or enhanced solutions after commercial release. Defects may cause our solutions to be vulnerable to attacks, cause them to fail to detect vulnerabilities, or temporarily interrupt customers’ networking traffic. Any errors, defects, disruptions in service or other performance problems with our solutions may damage our customers’ business and could hurt our reputation. If our solutions or fail to detect vulnerabilities for any reason, we may incur significant costs, the attention of our key personnel could be diverted, our customers may delay or withhold payment to us or elect not to renew or other significant customer relations problems may arise. We may also be subject to liability claims for damages related to errors or defects in our solutions. A material liability claim or other occurrence that harms our reputation or decreases market acceptance of our solutions may harm our business and operating results.
An actual or perceived security breach or theft of the sensitive data of one of our customers, regardless of whether the breach is attributable to the failure of our solutions, could adversely affect the market’s perception of our brand and our offerings and subject us to legal claims.
Our future quarterly results of operations are likely to fluctuate significantly due to a wide range of factors, which makes our future results difficult to predict.
Our revenue and results of operations have historically varied from period to period, and we expect that they will continue to do so as a result of a number of factors, many of which are outside of our control, including:

• | the level of demand for our enterprise platform;

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• | the introduction of new products and product enhancements by existing competitors or new entrants into our market, and changes in pricing for solutions offered by us or our competitors;

• | the rate of renewal of subscriptions, and extent of expansion of IT assets under such subscriptions, with existing customers;

• | the mix of customers licensing our products on a subscription basis as compared to a perpetual license;

• | large customers failing to renew their subscriptions;

• | the size, timing and terms of our subscription agreements with new customers;

• | our ability to interoperate our solutions with our customers’ network and security infrastructure;

• | the timing and growth of our business, in particular through our hiring of new employees and international expansion;

• | network outages, security breaches, technical difficulties or interruptions with our solutions;

• | changes in the growth rate of the markets in which we compete;

• | the length of the license term, amount prepaid and other material terms of subscriptions to our solutions sold during a period;

• | customers delaying purchasing decisions in anticipation of new developments or enhancements by us or our competitors or otherwise;

• | changes in customers’ budgets;

• | seasonal variations related to sales and marketing and other activities, such as expenses related to our customers;

• | our ability to increase, retain and incentivize the channel partners that market and sell our solutions;

• | our ability to integrate our solutions with our ecosystem partners’ technology;

• | our brand and reputation;

• | the timing of our adoption of new or revised accounting pronouncements applicable to public companies and the impact on our results of operations;

• | our ability to control costs, including our operating expenses;

• | our ability to hire, train and maintain our direct sales force;

• | unforeseen litigation and intellectual property infringement;

• | fluctuations in our effective tax rate; and

• | general economic and political conditions, both domestically and internationally, as well as economic conditions specifically affecting industries in which our customers operate.

Any one of these or other factors discussed elsewhere in this Quarterly Report on Form 10-Q, or the cumulative effect of some of these factors, may result in fluctuations in our revenue and operating results, meaning that quarter-to-quarter comparisons of our revenue, results of operations and cash flows may not necessarily be indicative of our future performance and may cause us to miss our guidance and analyst expectations and may cause our stock price to decline.
In addition, we have historically experienced seasonality in entering into agreements with customers. We typically enter into a significantly higher percentage of agreements with new customers, as well as renewal agreements with existing customers, in the third and fourth quarters. The increase in customer agreements in the third quarter is primarily attributable to U.S. government and related agencies, and the increase in the fourth quarter is primarily attributable to large enterprise account buying patterns typical in the software industry. We expect that seasonality will continue to affect our operating results in the future and may reduce our ability to predict cash flow and optimize the timing of our operating expenses.
We face intense competition.
The market for cybersecurity solutions is fragmented, intensely competitive and constantly evolving. We compete with a range of established and emerging cybersecurity software and services vendors, as well as homegrown solutions. With the introduction of new technologies and market entrants, we expect the competitive environment to remain intense going forward. Our competitors include: vulnerability management and assessment vendors, including Qualys and Rapid7; diversified security software and services vendors, including IBM; endpoint security vendors with nascent vulnerability assessment capabilities, including Tanium and CrowdStrike; and providers of point solutions that compete with some of the features present in our solutions. We also compete against internally-developed efforts that often use open source solutions.
Some of our actual and potential competitors have significant advantages over us, such as longer operating histories, significantly greater financial, technical, marketing or other resources, stronger brand and business user recognition, larger intellectual property portfolios and broader global distribution and presence. In addition, our industry
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is evolving rapidly and is becoming increasingly competitive. Larger and more established companies may focus on cybersecurity and could directly compete with us. Smaller companies could also launch new products and services that we do not offer and that could gain market acceptance quickly.
Our competitors may be able to respond more quickly and effectively than we can to new or changing opportunities, technologies, standards or customer requirements. With the introduction of new technologies, the evolution of our offerings and new market entrants, we expect competition to intensify in the future. In addition, some of our larger competitors have substantially broader product offerings and can bundle competing products and services with other software offerings. As a result, customers may choose a bundled product offering from our competitors, even if individual products have more limited functionality than our solutions. These competitors may also offer their products at a lower price as part of this larger sale, which could increase pricing pressure on our offerings and cause the average sales price for our offerings to decline. These larger competitors are also often in a better position to withstand any significant reduction in capital spending, and will therefore not be as susceptible to economic downturns. One component of our enterprise platform involves assessing Cyber Exposure in a public cloud environment. We are dependent upon the public cloud providers to allow our solutions to access their cloud offerings. If one or more cloud providers elected to offer exclusively their own cloud security product or otherwise eliminate the ability of our solutions to access their cloud on behalf of our customers, our business and financial results could be harmed.
Furthermore, our current and potential competitors may establish cooperative relationships among themselves or with third parties that may further enhance their resources and products and services offerings in the markets we address. In addition, current or potential competitors may be acquired by third parties with greater available resources. As a result of such relationships and acquisitions, our current or potential competitors might be able to adapt more quickly to new technologies and customer needs, devote greater resources to the promotion or sale of their products and services, initiate or withstand substantial price competition, take advantage of other opportunities more readily or develop and expand their product and service offerings more quickly than we do. For all of these reasons, we may not be able to compete successfully against our current or future competitors.
If we do not continue to innovate and offer solutions that address the dynamic cybersecurity landscape, we may not remain competitive.
The cybersecurity market is characterized by very rapid technological advances, changes in customer requirements, frequent new product introductions and enhancements and evolving industry standards. Our success also depends on continued innovation to provide features that make our solutions responsive to the cybersecurity landscape. While we continue to invest significant resources in research and development in order to ensure that our solutions continue to address the cyber security risks that our customers face, the introduction of solutions and services embodying new technologies could render our existing solutions or services obsolete or less attractive to customers. In addition, developing new solutions and product enhancements is expensive and time-consuming, and there is no assurance that such activities will result in significant cost savings, revenue or other expected benefits. For example, we plan to release a new product, Tenable.io Lumin, and there can be no assurance that product will offer the benefits we expect or generate customer interest. We may also face delays or uncertainty in our release timing for Tenable.io Lumin that may be costly or reduce the benefits of Lumin. If we spend significant time and effort on research and development and are unable to generate an adequate return on our investment, our business and results of operations may be materially and adversely affected. Further, we may not be able to successfully anticipate or adapt to changing technology or customer requirements or the dynamic threat landscape on a timely basis, or at all, which would impair our ability to execute on our business strategy.
Our business and results of operations depend substantially on our customers renewing their subscriptions with us and expanding the number of IT assets or IP addresses under their subscriptions. Any decline in our customer renewals, terminations or failure to convince our customers to expand their use of subscription offerings would harm our business, results of operations, and financial condition.
Our subscription offerings are term-based and a majority of our subscription contracts entered into in 2017 and 2018 were for one year in duration. In order for us to maintain or improve our results of operations, it is important that a high percentage of our customers renew their subscriptions with us when the existing subscription term expires, and renew on the same or more favorable terms. Our customers have no obligation to renew their subscriptions, and we may not be able to accurately predict customer renewal rates. In addition, the growth of our business depends in part on our customers expanding their use of subscription offerings and related services. Historically, some of our customers have elected not to renew their subscriptions with us for a variety of reasons, including as a result of changes in their strategic IT priorities, budgets, costs and, in some instances, due to competing solutions. Our
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retention rate may also decline or fluctuate as a result of a number of other factors, including our customers’ satisfaction or dissatisfaction with our software, the increase in the contract value of subscription and support contracts from new customers, the effectiveness of our customer support services, our pricing, the prices of competing products or services, mergers and acquisitions affecting our customer base, global economic conditions, and the other risk factors described in this Quarterly Report on Form 10-Q. Additionally, many of our customers, including certain top customers, have the right to terminate their agreements with us for convenience and for other reasons. We cannot assure you that customers will maintain their agreements with us, renew subscriptions or increase their usage of our software. If our customers do not maintain or renew their subscriptions or renew on less favorable terms, or if we are unable to expand our customers’ use of our software, our business, results of operations, and financial condition may be harmed.
In addition, while customers are typically invoiced in advance, including multi-year contracts, and our contracts generally do not provide for refunds during the subscription or maintenance period, a small number of customers could take the position that provisions in their customer agreements give them the right to terminate their agreement with us, or allege a material breach of their agreement with us, due to or in connection with the sale of our common stock. Early termination of these customer agreements for these reasons would generally only allow us to retain fees already paid by the customer for services rendered prior to the termination. Termination of these agreements, or allegations that we have breached one of these agreements with them, could decrease our customer revenue and increase legal and administrative costs.
Our brand, reputation and ability to attract, retain and serve our customers are dependent in part upon the reliable performance of our solutions and network infrastructure.
We have experienced, and may in the future experience, disruptions, outages and other performance problems due to a variety of factors, including infrastructure changes, human or software errors, capacity constraints and fraud or cybersecurity attacks. In some instances, we may not be able to identify the cause or causes of these performance problems within an acceptable period of time.
Prolonged delays or unforeseen difficulties in connection with adding capacity or upgrading our network architecture when required may cause our service quality to suffer. Problems with the reliability or security of our systems could harm our reputation. Damage to our reputation and the cost of remedying these problems could negatively affect our business, financial condition, and operating results.
Any disruptions or other performance problems with our solutions could harm our reputation and business and may damage our customers’ businesses. Interruptions in our service delivery might reduce our revenue, cause us to issue credits to customers, subject us to potential liability and cause customers to not renew their purchases of our solutions.
We must maintain and enhance our brand.
We believe that developing and maintaining widespread awareness of our brand in a cost-effective manner is critical to achieving widespread acceptance of our enterprise platform and attracting new customers. Brand promotion activities may not generate customer awareness or increase revenue and, even if they do, any increase in revenue may not offset the expenses we incur in building our brand. If we fail to successfully promote and maintain our brand, or incur substantial expenses, we may fail to attract or retain customers necessary to realize a sufficient return on our brand-building efforts, or to achieve the widespread brand awareness that is critical for broad customer adoption of our solutions.
We rely on third parties to maintain and operate certain elements of our network infrastructure.
We utilize data centers located in North America, Europe and Asia to operate and maintain certain elements of our own network infrastructure. Some elements of this complex system are operated by third parties that we do not control and that could require significant time to replace. We expect this dependence on third parties to continue. For example, Tenable.io is hosted on Amazon Web Services, or AWS, which provides us with computing and storage capacity. Interruptions in our systems or the third-party systems on which we rely, particularly AWS, whether due to system failures, computer viruses, physical or electronic break-ins or other factors, could affect the security or availability of our solutions, network infrastructure and website.
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Our existing data center facilities and third-party hosting providers have no obligations to renew their agreements with us on commercially reasonable terms or at all, and certain of the agreements governing these relationships may be terminated by either party at any time, with no or limited notice. For example, our agreement with AWS allows AWS to terminate the agreement with 30 days’ written notice. Although we expect that we could receive similar services from other third parties, if any of our arrangements with third parties, including AWS, are terminated, we could experience interruptions on our platform and in our ability to make our platform available to customers, as well as downtime, delays and additional expenses in arranging alternative cloud infrastructure services.
It is possible that our customers and potential customers would hold us accountable for any breach of security affecting third parties’ infrastructure. We may incur significant liability from those customers and from third parties with respect to any such breach. Because our agreement with AWS limits their liability for damages, we may not be able to recover a material portion of our liabilities to our customers and third parties from AWS in the event of any breach affecting AWS systems.
If we continue to grow, we may not be able to manage our growth effectively.
We have recently experienced a period of rapid growth in our headcount and operations. In particular, we grew from 751 employees as of December 31, 2016 to 984 employees as of December 31, 2017 and to 1,205 employees as of September 30, 2018. We have also significantly increased the size of our customer base over the last several years. We anticipate that we will continue to significantly expand our operations and headcount in the near term. Our growth has placed, and future growth will place, a significant strain on our management, administrative, operational and financial infrastructure. Our success will depend in part on our ability to manage this growth effectively. To manage the expected growth of our operations and personnel, we will need to continue to improve our operational, financial and management controls and our reporting systems and procedures. Failure to effectively manage our growth could result in difficulty or delays in deploying our solutions and services to customers, declines in quality or customer satisfaction, increases in costs, difficulties in introducing new features or other operational difficulties. Any of these difficulties could adversely impact our business performance and results of operations.
Our rapid growth also makes it difficult to evaluate our future prospects. Our ability to forecast our future operating results is subject to a number of uncertainties, including our ability to plan for and model future growth. If our assumptions regarding these uncertainties, which we use to plan our business, are incorrect or change in reaction to changes in our markets, or if we do not address these risks successfully, our operating and financial results could differ materially from our expectations, our business could suffer and the trading price of our stock may decline.
Organizations may be reluctant to purchase our enterprise platform offerings that are cloud-based due to the actual or perceived vulnerability of cloud solutions.
Some organizations, including those in the defense industry and highly regulated industries such as healthcare and financial services, have historically been reluctant to use cloud-based solutions for cybersecurity because they have concerns regarding the risks associated with the reliability or security of the technology delivery model associated with these solutions. If we or other software companies with cloud-based offerings experience security incidents, breaches of customer data, disruptions in service delivery or other problems, the market for cloud-based solutions as a whole may be negatively impacted, which in turn would negatively impact our revenue and our growth prospects.
Our sales cycle is long and unpredictable.
The timing of sales of our offerings is difficult to forecast because of the length and unpredictability of our sales cycle, particularly with large enterprises and with respect to certain of our solutions. We sell our solutions primarily to IT departments that are managing a growing set of user and compliance demands, which has increased the complexity of customer requirements to be met and confirmed during the sales cycle and prolonged our sales cycle. Our average sales cycle with an enterprise customer is approximately four months. Further, the length of time that potential customers devote to their testing and evaluation, contract negotiation and budgeting processes varies significantly, depending on the size of the organization and nature of the product or service under consideration. In addition, we might devote substantial time and effort to a particular unsuccessful sales effort, and as a result, we could lose other sales opportunities or incur expenses that are not offset by an increase in revenue, which could harm our business.
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We rely on our third-party channel partner network of distributors and resellers to generate a substantial amount of our revenue.
Our success is dependent in part upon establishing and maintaining relationships with a variety of channel partners that we utilize to extend our geographic reach and market penetration. We use a two-tiered, indirect fulfillment model whereby we sell our products and services to our distributors, which in turn sell to our resellers, which then sell to our end users, which we call customers. We anticipate that we will continue to rely on this two-tiered sales model in order to help facilitate sales of our offerings as part of larger purchases in the United States and to grow our business internationally. In 2016, 2017 and the nine months ended September 30, 2017 and 2018, we derived 80%, 83%, 82% and 87%, respectively, of our revenue from subscriptions and perpetual licenses sold through channel partners, and the percentage of revenue derived from channel partners may increase in future periods. Ingram Micro, Inc., a distributor, accounted for 42%, 45% 42% and 46% of our revenue in 2016, 2017 and the nine months ended September 30, 2017 and 2018, respectively, and 51% of our accounts receivable as of each of December 31, 2016 and 2017 and 47% as of September 30, 2018. At December 31, 2017, our channel partners accounted for over 20% of our new enterprise customer sales. Our agreements with our channel partners, including our agreement with Ingram Micro, are non-exclusive and do not prohibit them from working with our competitors or offering competing solutions, and some of our channel partners may have more established relationships with our competitors. Similarly, our channel partners have no obligations to renew their agreements with us on commercially reasonable terms or at all, and certain of the agreements governing these relationships may be terminated by either party at any time, with no or limited notice. For example, our agreement with Ingram Micro allows Ingram Micro to terminate the agreement in their discretion upon 30 days’ written notice to us. If our channel partners choose to place greater emphasis on products of their own or those offered by our competitors or a result of an acquisition, competitive factors or other reasons do not continue to market and sell our solutions in an effective manner or at all, our ability to grow our business and sell our solutions, particularly in key international markets, may be adversely affected. In addition, our failure to recruit additional channel partners, or any reduction or delay in their sales of our solutions and professional services or conflicts between channel sales and our direct sales and marketing activities may harm our results of operations. Finally, even if we are successful, our relationships with channel partners may not result in greater customer usage of our solutions and professional services or increased revenue.
A portion of our revenue is generated from subscriptions and perpetual licenses sold to domestic governmental entities, foreign governmental entities and other heavily regulated organizations, which are subject to a number of challenges and risks.
A portion of our revenue is generated from subscriptions and perpetual licenses sold to governmental entities in the United States. Additionally, many of our current and prospective customers, such as those in the financial services, energy, insurance and healthcare industries, are highly regulated and may be required to comply with more stringent regulations in connection with subscribing to and implementing our enterprise platform. Selling licenses to these entities can be highly competitive, expensive and time-consuming, often requiring significant upfront time and expense without any assurance that we will successfully complete a sale. Governmental demand and payment for our enterprise platform may also be impacted by public sector budgetary cycles and funding authorizations, with funding reductions or delays adversely affecting public sector demand for our enterprise platform. In addition, governmental entities have the authority to terminate contracts at any time for the convenience of the government, which creates risk regarding revenue anticipated under our existing government contracts.
Further, governmental and highly regulated entities often require contract terms that differ from our standard customer arrangements, including terms that can lead to those customers obtaining broader rights in our solutions than would be expected under a standard commercial contract and terms that can allow for early termination. The U.S. government will be able to terminate any of its contracts with us either for its convenience or if we default by failing to perform in accordance with the contract schedule and terms. Termination for convenience provisions would generally enable us to recover only our costs incurred or committed, settlement expenses, and profit on the work completed prior to termination. Termination for default provisions do not permit these recoveries and would make us liable for excess costs incurred by the U.S. government in procuring undelivered items from another source. Contracts with governmental and highly regulated entities may also include preferential pricing terms. In the United States, federal government agencies may promulgate regulations, and the President may issue executive orders, requiring federal contractors to adhere to different or additional requirements after a contract is signed. If we do not meet applicable requirements of law or contract, we could be subject to significant liability from our customers or regulators. Even if we do meet these requirements, the additional costs associated with providing our enterprise platform to government and highly regulated customers could harm our operating results. Moreover, changes in the underlying statutory and regulatory conditions that affect these types of customers could harm our ability to efficiently provide them access to
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our enterprise platform and to grow or maintain our customer base. In addition, engaging in sales activities to foreign governments introduces additional compliance risks, including risks specific to the U.S. Foreign Corrupt Practices Act of 1977, as amended, or the FCPA, the U.K. Bribery Act 2010 and other similar statutory requirements prohibiting bribery and corruption in the jurisdictions in which we operate.
Some of our revenue is derived from contracts with U.S. government entities, as well as subcontracts with higher-tier contractors. As a result, we are subject to federal contracting regulations, including the Federal Acquisition Regulation, or the FAR. Under the FAR, certain types of contracts require pricing that is based on estimated direct and indirect costs, which are subject to change.
In connection with our U.S. government contracts, we may be subject to government audits and review of our policies, procedures, and internal controls for compliance with contract terms, procurement regulations, and applicable laws. In certain circumstances, if we do not comply with the terms of a contract or with regulations or statutes, we could be subject to contract termination or downward contract price adjustments or refund obligations, could be assessed civil or criminal penalties, or could be debarred or suspended from obtaining future government contracts for a specified period of time. Any such termination, adjustment, sanction, debarment or suspension could have an adverse effect on our business.
In the course of providing our solutions and professional services to governmental entities, our employees and those of our channel partners may be exposed to sensitive government information. Any failure by us or our channel partners to safeguard and maintain the confidentiality of such information could subject us to liability and reputational harm, which could materially and adversely affect our results of operations and financial performance.
We may need to reduce our prices or change our pricing model to remain competitive.
Subscriptions and perpetual licenses to our enterprise platform are generally priced based on the number of IP addresses that can be monitored, or the total IT assets that can be monitored. We expect that we may need to change our pricing from time to time. As competitors introduce new products that compete with ours or reduce their prices, we may be unable to attract new customers or retain existing customers based on our historical pricing. We also must determine the appropriate price to enable us to compete effectively internationally. Moreover, mid- to large-size enterprises may demand substantial price discounts as part of the negotiation of sales contracts. As a result, we may be required or choose to reduce our prices or change our pricing model, which could adversely affect our business, operating results and financial condition.
Our pricing model subjects us to various challenges that could make it difficult for us to derive expected value from our customers.
Our enterprise platform offerings are generally priced based on the number of IT assets or IP addresses that a customer chooses to monitor. As the amount of IT assets or IP addresses within our customers’ organizations grows, we may face pressure from our customers regarding our pricing, which could adversely affect our revenue and operating margins.
Our subscription agreements and perpetual licenses generally provide that we can audit our customers’ use of our offerings to ensure compliance with the terms of such agreement or license and monitor an increase in IT assets and IP addresses being monitored. However, a customer may resist or refuse to allow us to audit their usage, in which case we may have to pursue legal recourse to enforce our rights under the agreement or license, which would require us to spend money, distract management and potentially adversely affect our relationship with our customers and users.
If our enterprise platform offerings do not achieve sufficient market acceptance, our results of operations and competitive position will suffer.
We spend substantial amounts of time and money to research and develop and enhance our enterprise platform offerings to meet our customers’ rapidly evolving demands. In addition, we invest in efforts to continue to add capabilities to our existing products and enable the continued detection of new network vulnerabilities. We typically incur expenses and expend resources upfront to market, promote and sell our new and enhanced offerings. Therefore, when we develop and introduce new or enhanced offerings, they must achieve high levels of market acceptance in order to justify the amount of our investment in developing and bringing them to market. For example, if Tenable.io
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does not garner widespread market adoption and implementation, our operating results and competitive position could suffer.
Further, we may make enhancements to our offerings that our customers do not like, find useful or agree with. We may also discontinue certain features, begin to charge for certain features that are currently free or increase fees for any of our features or usage of our offerings.
Our new offerings or enhancements and changes to our existing offerings could fail to attain sufficient market acceptance for many reasons, including:

• | failure to predict market demand accurately in terms of functionality and to supply offerings that meets this demand in a timely fashion;

• | defects, errors or failures;

• | negative publicity about their performance or effectiveness;

• | delays in releasing our new offerings or enhancements to our existing offerings to the market;

• | introduction or anticipated introduction of competing products by our competitors;

• | poor business conditions for our customers, causing them to delay IT purchases; and

• | reluctance of customers to purchase cloud-based offerings.

If our new or enhanced offerings do not achieve adequate acceptance in the market, our competitive position will be impaired, and our revenue will be diminished. The adverse effect on our operating results may be particularly acute because of the significant research, development, marketing, sales and other expenses we will have incurred in connection with the new or enhanced offerings.
Our strategy of offering and deploying our solutions in the cloud, on-premises environments or using a hybrid approach causes us to incur increased expenses and may pose challenges to our business.
We offer and sell our enterprise platform for use in the cloud, on-premises environments or using a hybrid approach using the customer’s own infrastructure. Our cloud offering enables our customers to eliminate the burden of provisioning and maintaining infrastructure and to scale their usage of our solutions quickly, while our on-premises offering allows for the customer’s complete control over data security and software infrastructure. Historically, our solutions were developed in the context of the on-premises offering, and we have less operating experience offering and selling subscriptions to our solutions via our cloud offering. Although a substantial majority of our revenue has historically been generated from customers using our solutions on an on-premises basis, our customers are increasingly adopting our cloud offering. We expect that our customers will continue to move to our cloud offering and that it will become more central to our distribution model. We expect our gross profit to increase in absolute dollars and our gross margin to decrease to the extent that revenue from our cloud-based subscriptions increases as a percentage of revenue, although our gross margin could fluctuate from period to period. To support both on-premises environments and cloud instances of our product, our support team must be trained on and learn multiple environments in which our solution is deployed, which is more expensive than supporting only a cloud offering. Moreover, we must engineer our software for an on-premises environment, cloud offering and hybrid installation, which we expect will cause us additional research and development expense that may impact our operating results. As more of our customers transition to the cloud, we may be subject to additional competitive pressures, which may harm our business. We are directing a significant portion of our financial and operating resources to implement a robust and secure cloud offering for our customers, but even if we continue to make these investments, we may be unsuccessful in growing or implementing our cloud offering in a way that competes successfully against our current and future competitors and our business, results of operations and financial condition could be harmed.
Our customers’ increased usage of our cloud-based offerings requires us to continually improve our computer network and infrastructure to avoid service interruptions or slower system performance.
As usage of our cloud-based offerings grows and as customers use them for more complicated applications, increased assets and with increased data requirements, we will need to devote additional resources to improving our platform architecture and our infrastructure in order to maintain the performance of our cloud offering. Any failure or delays in our computer systems could cause service interruptions or slower system performance. If sustained or repeated, these performance issues could reduce the attractiveness of our enterprise platform to customers. These performance issues could result in lost customer opportunities and lower renewal rates, any of which could hurt our revenue growth, customer loyalty and reputation.
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A component of our growth strategy is dependent on our continued international expansion, which adds complexity to our operations.
We market and sell our solutions and professional services throughout the world and have personnel in many parts of the world. International operations generated 31% and 33% of our revenue in 2017 and the nine months ended September 30, 2018, respectively. Our growth strategy is dependent, in part, on our continued international expansion. We expect to conduct a significant amount of our business with organizations that are located outside the United States, particularly in Europe and Asia. We cannot assure that our expansion efforts into international markets will be successful in creating further demand for our solutions and professional services outside of the United States or in effectively selling our solutions and professional services in the international markets that we enter. Our current international operations and future initiatives will involve a variety of risks, including:

• | increased management, infrastructure and legal costs associated with having international operations;

• | reliance on channel partners;

• | trade and foreign exchange restrictions;

• | economic or political instability in foreign markets, including instability related to the United Kingdom’s referendum in June 2016 in which voters approved an exit from the European Union, commonly referred to as “Brexit”;

• | greater difficulty in enforcing contracts, accounts receivable collection and longer collection periods;

• | changes in regulatory requirements, including, but not limited to data privacy, data protection and data security regulations;

• | difficulties and costs of staffing, managing and potentially reorganizing foreign operations;

• | the uncertainty and limitation of protection for intellectual property rights in some countries;

• | costs of compliance with foreign laws and regulations and the risks and costs of non-compliance with such laws and regulations;

• | costs of compliance with U.S. laws and regulations for foreign operations, including the FCPA, import and export control laws, tariffs, trade barriers, economic sanctions and other regulatory or contractual limitations on our ability to sell or provide our solutions in certain foreign markets, and the risks and costs of non-compliance;

• | requirements to comply with foreign privacy, data protection and information security laws and regulations and the risks and costs of noncompliance;

• | heightened risks of unfair or corrupt business practices in certain geographies and of improper or fraudulent sales arrangements that may impact financial results and result in restatements of, and irregularities in, financial statements;

• | the potential for political unrest, acts of terrorism, hostilities or war;

• | management communication and integration problems resulting from cultural differences and geographic dispersion;

• | costs associated with language localization of our solutions; and

• | costs of compliance with multiple and possibly overlapping tax structures.

Our business, including the sales of our solutions and professional services by us and our channel partners, may be subject to foreign governmental regulations, which vary substantially from country to country and change from time to time. Our failure, or the failure by our channel partners, to comply with these regulations could adversely affect our business. Further, in many foreign countries it is common for others to engage in business practices that are prohibited by our internal policies and procedures or U.S. regulations applicable to us. Although we have implemented policies and procedures designed to comply with these laws and policies, there can be no assurance that our employees, contractors, channel partners and agents have complied, or will comply, with these laws and policies. Violations of laws or key control policies by our employees, contractors, channel partners or agents could result in delays in revenue recognition, financial reporting misstatements, fines, penalties or the prohibition of the importation or exportation of our solutions and could have a material adverse effect on our business and results of operations. If we are unable to successfully manage the challenges of international expansion and operations, our business and operating results could be adversely affected.
We rely on the performance of highly skilled personnel, including senior management and our engineering, professional services, sales and technology professionals.
We believe our success has depended, and continues to depend, on the efforts and talents of our senior management team and our highly skilled team members, including our sales personnel, professional services personnel and software engineers. We do not maintain key man insurance on any of our executive officers or key employees. From time to time, there may be changes in our senior management team resulting from the termination or
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departure of our executive officers and key employees. Our senior management and key employees are employed on an at-will basis, which means that they could terminate their employment with us at any time. The loss of any of our senior management or key employees could adversely affect our ability to build on the efforts they have undertaken and to execute our business plan, and we may not be able to find adequate replacements. We cannot ensure that we will be able to retain the services of any members of our senior management or other key employees.
Our ability to successfully pursue our growth strategy also depends on our ability to attract, motivate and retain our personnel. Competition for well-qualified employees in all aspects of our business, including sales personnel, professional services personnel and software engineers, is intense. Our recruiting efforts focus on elite universities and our primary recruiting competition are well-known, high-paying firms. Our continued ability to compete effectively depends on our ability to attract new employees and to retain and motivate existing employees. If we do not succeed in attracting well-qualified employees or retaining and motivating existing employees, our business would be adversely affected.
We must effectively develop and expand our sales and marketing capabilities.
Our ability to increase our customer base and achieve broader market acceptance of our Cyber Exposure solutions will depend to a significant extent on our ability to expand our sales and marketing operations. We plan to continue expanding our sales force and our third-party channel partner network of distributors and resellers both domestically and internationally; however, there is no assurance that we will be successful in attracting and retaining talented sales personnel or strategic partners or that any new sales personnel or strategic partners will be able to achieve productivity in a reasonable period of time or at all. We also plan to dedicate significant resources to sales and marketing programs, including through electronic marketing campaigns and trade event sponsorship and participation. All of these efforts will require us to invest significant financial and other resources and our business will be harmed if our efforts do not generate a correspondingly significant increase in revenue.
We must offer high-quality support.
Our customers rely on our personnel for support of our enterprise platform. High-quality support is important for the renewal of our agreements with existing customers and to our existing customers expanding the number of IP addresses or IT assets under their subscriptions. The importance of high-quality support will increase as we expand our business and pursue new customers. If we do not help our customers quickly resolve issues and provide effective ongoing support, our ability to sell new software to existing and new customers would suffer and our reputation with existing or potential customers would be harmed.
Our growth depends in part on the success of our strategic relationships with third parties.
In order to grow our business, we anticipate that we will continue to depend on relationships with strategic partners to provide broader customer coverage and solution delivery capabilities. We depend on partnerships with market leading technology companies to maintain and expand our Cyber Exposure ecosystem by integrating third party data into our platform. For example, we developed our Industrial Security solution in partnership with Siemens. Identifying partners, and negotiating and documenting relationships with them, requires significant time and resources. Our agreements with our strategic partners generally are non-exclusive and do not prohibit them from working with our competitors or offering competing solutions. Our competitors may be effective in providing incentives to third parties to favor their products or services or to prevent or reduce subscriptions to our services. If our partners choose to place greater emphasis on products of their own or those offered by our competitors or do not effectively market and sell our product, our ability to grow our business and sell software and professional services may be adversely affected. In addition, acquisitions of our partners by our competitors could result in a decrease in the number of our current and potential customers, as our partners may no longer facilitate the adoption of our solutions by potential customers.
If we are unsuccessful in establishing or maintaining our relationships with third parties, our ability to compete in the marketplace or to grow our revenue could be impaired and our operating results may suffer. Even if we are successful, we cannot assure you that these relationships will result in increased customer usage of our solutions or increased revenue.
Catastrophic events may disrupt our business.
Our corporate headquarters are located in Columbia, Maryland. The area around Washington, D.C. could be subject to terrorist attacks. Additionally, we rely on our network and third-party infrastructure and enterprise
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applications, internal technology systems and our website for our development, marketing, operational support, hosted services and sales activities. In the event of a major hurricane, earthquake or catastrophic event such as fire, power loss, telecommunications failure, cyberattack, war or terrorist attack, we may be unable to continue our operations and may endure system interruptions, reputational harm, delays in our software development, lengthy interruptions in our services, breaches of data security and loss of critical data, all of which could have an adverse effect on our future operating results.
Future acquisitions could disrupt our business and adversely affect our business operations and financial results.
We have in the past acquired products and technologies from other parties, and we may choose to expand our current business by acquiring additional businesses or technologies in the future. Acquisitions involve many risks, including the following:

• | an acquisition may negatively affect our financial results because it may require us to incur charges or assume substantial debt or other liabilities, may cause adverse tax consequences or unfavorable accounting treatment, may expose us to claims and disputes by third parties, including intellectual property claims and disputes, or may not generate sufficient financial return to offset additional costs and expenses related to the acquisition;

• | we may encounter difficulties or unforeseen expenditures in integrating the business, technologies, products, personnel or operations of any company that we acquire, particularly if key personnel of the acquired company decide not to work for us;

• | an acquisition may disrupt our ongoing business, divert resources, increase our expenses and distract our management;

• | an acquisition may result in a delay or reduction of customer purchases for both us and the company acquired due to customer uncertainty about continuity and effectiveness of service from either company;

• | we may encounter difficulties in, or may be unable to, successfully sell any acquired solutions;

• | an acquisition may involve the entry into geographic or business markets in which we have little or no prior experience or where competitors have stronger market positions;

• | our use of cash to pay for an acquisition would limit other potential uses for our cash; and

• | if we incur debt to fund such acquisition, such debt may subject us to material restrictions on our ability to conduct our business as well as financial maintenance covenants.

The occurrence of any of these risks could have a material adverse effect on our business operations and financial results. In addition, we may only be able to conduct limited due diligence on an acquired company’s operations. Following an acquisition, we may be subject to unforeseen liabilities arising from an acquired company’s past or present operations and these liabilities may be greater than the warranty and indemnity limitations that we negotiate. Any unforeseen liability that is greater than these warranty and indemnity limitations could have a negative impact on our financial condition.
We may require additional capital to support business growth, and this capital might not be available on acceptable terms, if at all.
We expect that our existing cash and cash equivalents will be sufficient to meet our anticipated cash needs for working capital and capital expenditures for at least the next 12 months. However, we intend to continue to make investments to support our business growth and may require additional funds to respond to business challenges, including the need to develop new features or enhance our product, improve our operating infrastructure or acquire complementary businesses and technologies. Accordingly, we may need to engage in equity or debt financings to secure additional funds. If we raise additional funds through future issuances of equity or convertible debt securities, our existing stockholders could suffer significant dilution, and any new equity securities we issue could have rights, preferences and privileges superior to those of holders of our common stock. Our loan and security agreement with Silicon Valley Bank includes restrictive covenants relating to our capital raising activities and other financial and operational matters, which may make it more difficult for us to obtain additional capital and to pursue business opportunities, including potential acquisitions, and any debt financing that we secure in the future could have similar restrictive covenants. We may not be able to obtain additional financing on terms favorable to us, if at all. If we are unable to obtain adequate financing or financing on terms satisfactory to us when we require it, our ability to continue to support our business growth and to respond to business challenges could be significantly impaired, and our business may be adversely affected.
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The nature of our business requires the application of complex revenue recognition rules. Significant changes in current principles will affect our consolidated financial statements and changes in financial accounting standards or practices may cause adverse, unexpected financial reporting fluctuations and harm our results of operations.
The accounting rules and regulations that we must comply with are complex and subject to interpretation by the Financial Accounting Standards Board, or FASB, the Securities and Exchange Commission, or SEC, and various bodies formed to promulgate and interpret appropriate accounting principles. In addition, many companies’ accounting disclosures are being subjected to heightened scrutiny by regulators and the public. Further, the accounting rules and regulations are continually changing in ways that could impact our financial statements.
For example, in May 2014, the FASB issued new accounting guidance on revenue recognition in the form of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASC 606. The core principle of ASC 606 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. We early adopted ASC 606 as of January 1, 2017. The most significant impact of adopting ASC 606 was the deferral of perpetual license revenue over an estimated economic life, including estimated maintenance renewal periods, whereas under previous guidance we recognized perpetual license revenue upon delivery of the perpetual license. The impact of the adoption of ASC 606 on our 2017 revenue was a net increase of $3.5 million after giving effect to the recognition of perpetual license revenue from prior year sales and the deferral of perpetual license revenue from 2017 sales. Additionally, the incremental costs of obtaining a contract with a customer are deferred and will be amortized over a longer estimated period of benefit, whereas under previous guidance such costs were recognized immediately or amortized over the contract term.
If our estimates or judgments relating to our critical accounting policies prove to be incorrect or financial reporting standards or interpretations change, our results of operations could be adversely affected.
The preparation of financial statements in conformity with generally accepted accounting principles in the United States, or U.S. GAAP, requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, as provided in “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” The results of these estimates form the basis for making judgments about the carrying values of assets, liabilities and equity, and the amount of revenue and expenses that are not readily apparent from other sources. Significant assumptions and estimates used in preparing our consolidated financial statements include estimated economic life of perpetual licenses for revenue recognition, the estimated period of benefit for deferred commissions, income taxes and the related valuation allowance and stock-based compensation. Our results of operations may be adversely affected if our assumptions change or if actual circumstances differ from those in our assumptions, which could cause our results of operations to fall below the expectations of securities analysts and investors, resulting in a decline in the trading price of our common stock.
Additionally, we regularly monitor our compliance with applicable financial reporting standards and review new pronouncements and drafts thereof that are relevant to us. As a result of new standards, changes to existing standards and changes in their interpretation, we might be required to change our accounting policies, alter our operational policies and implement new or enhance existing systems so that they reflect new or amended financial reporting standards, or we may be required to restate our published financial statements. Such changes to existing standards or changes in their interpretation may have an adverse effect on our reputation, business, financial position and profit, or cause an adverse deviation from our revenue and operating profit target, which may negatively impact our financial results.
Our operating results may be negatively affected if we are required to pay additional state sales tax, value added, or other transaction taxes, and we could be subject to liability with respect to all or a portion of past or future sales.
We currently collect and remit sales and use, value added and other transaction taxes in certain of the jurisdictions where we do business based on our assessment of the amount of taxes owed by us in such jurisdictions. However, in some jurisdictions in which we do business, we do not believe that we owe such taxes, and therefore we currently do not collect and remit such taxes in those jurisdictions or record contingent tax liabilities in respect of those jurisdictions.
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Further, due to uncertainty in the application and interpretation of applicable tax laws in various jurisdictions, we may be exposed to sales and use, value added or other transaction tax liability. A successful assertion that we are required to pay additional taxes in connection with sales of our solutions, or the imposition of new laws or regulations requiring the payment of additional taxes, would create increased costs and administrative burdens for us. If we are subject to additional taxes and determine to offset such increased costs by collecting and remitting sales taxes from our customers, or otherwise passing those costs through to our customers, companies may be discouraged from using our solutions. Any increased tax burden may decrease our ability or willingness to compete in relatively burdensome tax jurisdictions, result in substantial tax liabilities related to past sales or otherwise harm our business and operating results.
Our ability to use net operating losses to offset future taxable income may be subject to certain limitations.
As of December 31, 2017 we had federal, state and foreign net operating loss carryforwards, or NOLs, of $103.7 million, $38.6 million, and $18.4 million, respectively, available to offset future taxable income, which begin to expire in 2030. A lack of future taxable income would adversely affect our ability to utilize these NOLs before they expire.
In addition, under the provisions of the Internal Revenue Code of 1986, as amended, or the Internal Revenue Code, substantial changes in our ownership may limit the amount of pre-change NOLs that can be utilized annually in the future to offset taxable income. Section 382 of the Internal Revenue Code imposes limitations on a company’s ability to use NOLs if a company experiences a more-than-50-percent ownership change over a three-year testing period. Based upon our analysis as of December 31, 2017, we have determined that we do not expect these limitations to impair our ability to use our NOLs prior to expiration. However, if changes in our ownership occur in the future, our ability to use our NOLs may be further limited. For these reasons, we may not be able to utilize a material portion of the NOLs, even if we achieve profitability.
Uncertainties in the interpretation and application of the 2017 Tax Cuts and Jobs Act could materially affect our tax obligations and effective tax rate.
Forecasts of our income tax position and effective tax rate for financial accounting purposes are complex and subject to uncertainty because our income tax position for each year combines the effects of a mix of profits earned and losses incurred by us in various tax jurisdictions with a broad range of income tax rates, as well as changes in the valuation of deferred tax assets and liabilities, the impact of various accounting rules and changes to these rules and tax laws, the results of examinations by various tax authorities, and the impact of any acquisition, business combination or other reorganization or financing transaction. To forecast our global tax rate, we estimate our pre-tax profits and losses by jurisdiction and forecast our tax expense by jurisdiction. If the mix of profits and losses, our ability to use tax credits, our assessment of the need for valuation allowances, or effective tax rates by jurisdiction is different than those estimated, our actual tax rate could be materially different than forecasted, which could have a material impact on our results of business, financial condition and results of operations.
On December 22, 2017, U.S. Federal tax reform was enacted with the signing of the Tax Cuts and Jobs Act, or TCJA. Notable provisions of the TCJA include significant changes to corporate taxation, including reduction of the corporate tax rate from a top marginal rate of 35% to a flat rate of 21%, limitation of the tax deduction for interest expense to 30% of adjusted earnings (except for certain small businesses), limitation of the deduction for net operating losses to 80% of current year taxable income and elimination of net operating loss carrybacks, one time taxation of offshore earnings at reduced rates regardless of whether they are repatriated, elimination of U.S. tax on foreign earnings (subject to certain important exceptions), immediate deductions for certain new investments instead of deductions for depreciation expense over time, and modifying or repealing many business deductions and credits.
While the changes from the TCJA are generally effective beginning in 2018, U.S. GAAP accounting for income taxes requires the effect of a change in tax laws or rates to be recognized in income from continuing operations for the period that includes the enactment date. Due to the complexities involved in accounting for the enactment of the TCJA, the Securities and Exchange Commission published Staff Accounting Bulletin No. 118, which allows us to record provisional amounts in earnings for the year ended December 31, 2017. Where reasonable estimates can be made, the provisional accounting should be based on such estimates. When no reasonable estimate can be made, the provisional accounting may be based on the tax law in effect before the TCJA. We are required to complete our tax accounting for the TCJA in the period when we have obtained, prepared, and analyzed the information to complete the income tax accounting, or by December 22, 2018, whichever date comes first.
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We have not completed our accounting for the tax effects of enactment of the TCJA; however, as we describe in Note 9 to our consolidated financial statements appearing elsewhere in this Quarterly Report on Form 10-Q, we have made reasonable estimates of the effects of the TCJA in certain cases in our financial statements that are included as a component of income tax expense. The U.S. Department of Treasury has broad authority to issue regulations and interpretative guidance that may significantly impact how we will apply the law and impact our results of operations in the period issued. As additional regulatory guidance is issued by the applicable taxing authorities, as accounting treatment is clarified, as we perform additional analysis on the application of the law, and as we refine estimates in calculating the effect, our final analysis, which will be recorded in the period completed, may be different from our current provisional amounts, which could materially affect our tax obligations and effective tax rate.
We are subject to anti-corruption laws, anti-bribery and similar laws with respect to our domestic and international operations, and non-compliance with such laws can subject us to criminal and/or civil liability and materially harm our business and reputation.
We are subject to the FCPA, the U.S. domestic bribery statute contained in 18 U.S.C. § 201, the U.S. Travel Act, the U.K. Bribery Act 2010, and other anti-corruption laws in countries in which we conduct activities. Anti-corruption laws are interpreted broadly and prohibit our company from authorizing, offering, or providing, directly or indirectly, improper payments or benefits to recipients in the public or private sector. We use third-party law firms, accountants, and other representatives for regulatory compliance, sales, and other purposes in several countries. We sell directly and indirectly, via third-party representatives, to the U.S. and non-U.S. government sectors, and our employees and third-party representatives interact with government officials. We can be held liable for the corrupt or other illegal activities of these third-party representatives, our employees, contractors, and other agents, even if we do not explicitly authorize such activities. Noncompliance with these laws could subject us to whistleblower complaints, investigations, sanctions, settlements, prosecution, other enforcement actions, disgorgement of profits, significant fines, damages, other civil and criminal penalties or injunctions, suspension and/or debarment from contracting with certain persons, the loss of export privileges, reputational harm, adverse media coverage, and other collateral consequences. If any subpoenas or investigations are launched, or governmental or other sanctions are imposed, or if we do not prevail in any possible civil or criminal litigation, our reputation, business, results of operations and financial condition could be materially harmed. In addition, responding to any action will likely result in a materially significant diversion of management’s attention and resources and significant defense costs and other professional fees. Enforcement actions and sanctions could further harm our business, results of operations, and financial condition. Moreover, as an issuer of securities, we also are subject to the accounting and internal controls provisions of the FCPA. These provisions require us to maintain accurate books and records and a system of internal controls sufficient to detect and prevent corrupt conduct. Failure to abide by these provisions may have an adverse effect on our business, operations or financial condition.
We are subject to governmental export and import controls and economic and trade sanctions that could impair our ability to conduct business in international markets and subject us to liability if we are not in compliance with applicable laws and regulations.
The United States and other countries maintain and administer export and import laws and regulations. Our products are subject to U.S. export control and import laws and regulations, including the U.S. Export Administration Regulations, U.S. Customs regulations, and various economic and trade sanctions administered by the U.S. Treasury Department’s Office of Foreign Assets Control. We are required to comply with these laws and regulations. If we fail to comply with such laws and regulations, we and certain of our employees could be subject to substantial civil or criminal penalties, including the possible loss of export or import privileges; fines, which may be imposed on us and responsible employees or managers; and, in extreme cases, the incarceration of responsible employees or managers. Obtaining the necessary authorizations, including any required license, for a particular sale may be time-consuming, is not guaranteed and may result in the delay or loss of sales opportunities. In addition, changes in our solutions, or changes in applicable export or import laws and regulations may create delays in the introduction and sale of our products in international markets or, in some cases, prevent the export or import of our solutions to certain countries, governments or persons altogether. Any change in export or import laws and regulations or economic or trade sanctions, shift in the enforcement or scope of existing laws and regulations, or change in the countries, governments, persons or technologies targeted by such laws and regulations could also result in decreased use of our products, or in our decreased ability to export or sell our products to existing or potential customers. Any decreased use of our products or limitation on our ability to export or sell our products would likely adversely affect our business, financial condition, and results of operations.
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Furthermore, we incorporate encryption technology into certain of our solutions. Various countries regulate the import of certain encryption technology, including import permitting and licensing requirements, and have enacted laws that could limit our ability to distribute our solutions or could limit our customers’ ability to implement our solutions in those countries. Encrypted products and the underlying technology may also be subject to export control restrictions. Governmental regulation of encryption technology and regulation of imports or exports of encryption solutions, or our failure to obtain required import or export approval for our solutions, could harm our international sales and adversely affect our revenue. Compliance with applicable laws and regulations regarding the export and import of our solutions, including with respect to new solutions or changes in existing solutions, may create delays in the introduction of our solutions in international markets, prevent our customers with international operations from deploying our solutions globally or, in some cases, could prevent the export or import of our solutions to certain countries, governments, entities or persons altogether.
Moreover, U.S. export control laws and economic sanctions programs prohibit the shipment of certain products and services to countries, governments and persons that are subject to U.S. economic embargoes and trade sanctions. Any violations of such economic embargoes and trade sanction regulations could have negative consequences, including government investigations, penalties and reputational harm.
Risks Related to Government Regulation, Data Collection and Intellectual Property
Our business could be adversely affected if our employees cannot obtain and maintain required security clearances or we cannot establish and maintain a required facility security clearance.
Certain U.S. government contracts may require our employees to maintain various levels of security clearances, and may require us to maintain a facility security clearance, to comply with Department of Defense, or DoD, requirements. The DoD has strict security clearance requirements for personnel who perform work in support of classified programs. Obtaining and maintaining security clearances for employees involves a lengthy process, and it is difficult to identify, recruit and retain employees who already hold security clearances. If our employees are unable to obtain security clearances in a timely manner, or at all, or if our employees who hold security clearances are unable to maintain their clearances or terminate employment with us, then a customer requiring classified work could terminate an existing contract or decide not to renew the contract upon its expiration. To the extent we are not able to obtain or maintain a facility security clearance, we may not be able to bid on or win new classified contracts, and existing contracts requiring a facility security clearance could be terminated.
Any failure to protect our proprietary technology and intellectual property rights could substantially harm our business and operating results.
Our success and ability to compete depend in part on our ability to protect our proprietary technology and intellectual property. To safeguard these rights, we rely on a combination of patent, trademark, copyright and trade secret laws and contractual protections in the United States and other jurisdictions, all of which provide only limited protection and may not now or in the future provide us with a competitive advantage.
As of September 30, 2018, we had 14 issued patents and three patent applications pending in the United States relating to our technology. We cannot assure you that any patents will issue from any patent applications, that patents that issue from such applications will give us the protection that we seek or that any such patents will not be challenged, invalidated or circumvented. Any patents that may issue in the future from our pending or future patent applications may not provide sufficiently broad protection and may not be enforceable in actions against alleged infringers. Obtaining and enforcing software patents in the United States is becoming increasingly challenging. Any patents we have obtained or may obtain in the future may be found to be invalid or unenforceable in light of recent and future changes in the law. We have registered the “Tenable,” “Nessus” and “Tenable.io” names and our Tenable logo in the United States and certain other countries. We have registrations and/or pending applications for additional marks in the United States; however, we cannot assure you that any future trademark registrations will be issued for pending or future applications or that any registered trademarks will be enforceable or provide adequate protection of our proprietary rights. While we have copyrights in our software we do not typically register such copyrights with the Copyright Office. This failure to register the copyrights in our software may preclude us from obtaining statutory damages for infringement under certain circumstances. We also license software from third parties for integration into our software, including open source software and other software available on commercially reasonable terms. We cannot assure you that such third parties will maintain such software or continue to make it available.
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In order to protect our unpatented proprietary technologies and processes, we rely on trade secret laws and confidentiality and invention assignment agreements with our employees, consultants, strategic partners, vendors and others. Despite our efforts to protect our proprietary technology and trade secrets, unauthorized parties may attempt to misappropriate, copy, reverse engineer or otherwise obtain and use them. In addition, others may independently discover our trade secrets, in which case we would not be able to assert trade secret rights, or develop similar technologies and processes. Further, several agreements may give customers limited rights to access portions of our proprietary source code, and the contractual provisions that we enter into may not prevent unauthorized use or disclosure of our proprietary technology or intellectual property rights and may not provide an adequate remedy in the event of unauthorized use or disclosure of our proprietary technology or intellectual property rights. Moreover, policing unauthorized use of our technologies, trade secrets and intellectual property is difficult, expensive and time-consuming, particularly in foreign countries where the laws may not be as protective of intellectual property rights as those in the United States and where mechanisms for enforcement of intellectual property rights may be weak. To the extent that we expand our activities outside of the United States, our exposure to unauthorized copying and use of our solutions and proprietary information may increase. We may be unable to determine the extent of any unauthorized use or infringement of our solutions, technologies or intellectual property rights.
There can be no assurance that the steps that we take will be adequate to protect our proprietary technology and intellectual property, that others will not develop or patent similar or superior technologies, solutions or services, or that our trademarks, patents, and other intellectual property will not be challenged, invalidated or circumvented by others. Furthermore, effective trademark, patent, copyright, and trade secret protection may not be available in every country in which our software is available or where we have employees or independent contractors. In addition, the legal standards relating to the validity, enforceability, and scope of protection of intellectual property rights in internet and software-related industries are uncertain and still evolving.
In order to protect our intellectual property rights, we may be required to spend significant resources to monitor and protect these rights. Litigation brought to protect and enforce our intellectual property rights could be costly, time-consuming and distracting to management and could result in the impairment or loss of portions of our intellectual property. Furthermore, our efforts to enforce our intellectual property rights may be met with defenses, counterclaims and countersuits attacking the validity and enforceability of our intellectual property rights. Our failure to secure, protect and enforce our intellectual property rights could seriously adversely affect our brand and adversely impact our business.
We may be subject to intellectual property rights claims by third parties, which are extremely costly to defend, could require us to pay significant damages and could limit our ability to use certain technologies.
Companies in the software and technology industries, including some of our current and potential competitors, own significant numbers of patents, copyrights, trademarks and trade secrets and frequently enter into litigation based on allegations of infringement or other violations of intellectual property rights. In addition, many of these companies have the capability to dedicate substantially greater resources to enforce their intellectual property rights and to defend claims that may be brought against them. The litigation may involve patent holding companies or other adverse patent owners that have no relevant product revenue and against which our patents may therefore provide little or no deterrence. In the past, we have been subject to allegations of patent infringement that were unsuccessful, and we expect in the future to be subject to claims that we have misappropriated, misused, or infringed other parties’ intellectual property rights, and, to the extent we gain greater market visibility or face increasing competition, we face a higher risk of being the subject of intellectual property infringement claims, which is not uncommon with respect to enterprise software companies. We may in the future be subject to claims that employees or contractors, or we, have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of our competitors or other parties. To the extent that intellectual property claims are made against our customers based on their usage of our technology, we have certain obligations to indemnify and defend such customers from those claims. The term of our contractual indemnity provisions often survives termination or expiration of the applicable agreement. Large indemnity payments, defense costs or damage claims from contractual breach could harm our business, results of operations and financial condition.
There may be third-party intellectual property rights, including issued or pending patents that cover significant aspects of our technologies or business methods. Any intellectual property claims, with or without merit, could be very time-consuming, could be expensive to settle or litigate, could divert our management’s attention and other resources and could result in adverse publicity. These claims could also subject us to making substantial payments for legal fees, settlement payments, and other costs or damages, potentially including treble damages if we are found to have willfully infringed patents or copyrights. These claims could also result in our having to stop making, selling, offering for sale, or
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using technology found to be in violation of a third party’s rights. We might be required to seek a license for the third-party intellectual property rights, which may not be available on reasonable terms or at all. Even if a license is available to us, we may be required to pay significant upfront fees, milestones or royalties, which would increase our operating expenses. Moreover, to the extent we only have a license to any intellectual property used in our solutions, there may be no guarantee of continued access to such intellectual property, including on reasonable terms. As a result, we may be required to develop alternative non-infringing technology, which could require significant effort and expense. If a third party is able to obtain an injunction preventing us from accessing such third-party intellectual property rights, or if we cannot license or develop technology for any infringing aspect of our business, we would be forced to limit or stop sales of our software or cease business activities covered by such intellectual property, and may be unable to compete effectively. Any of these results would adversely affect our business, results of operations, financial condition and cash flows.
Portions of our solutions utilize open source software, and any failure to comply with the terms of one or more of these open source licenses could negatively affect our business.
Our software contains software made available by third parties under so-called “open source” licenses. From time to time, there have been claims against companies that distribute or use open source software in their products and services, asserting that such open source software infringes the claimants’ intellectual property rights. We could be subject to suits by parties claiming that what we believe to be licensed open source software infringes their intellectual property rights. Use and distribution of open source software may entail greater risks than use of third-party commercial software, as open source licensors generally do not provide warranties or other contractual protections regarding infringement claims or the quality of the code. In addition, certain open source licenses require that source code for software programs that are subject to the license be made available to the public and that any modifications or derivative works to such open source software continue to be licensed under the same terms. Further, certain open source licenses also include a provision that if we enforce any patents against the software programs that are subject to the license, we would lose the license to such software. If we were to fail to comply with the terms of such open source software licenses, such failures could result in costly litigation, lead to negative public relations or require that we quickly find replacement software which may be difficult to accomplish in a timely manner.
Although we monitor our use of open source software in an effort both to comply with the terms of the applicable open source licenses and to avoid subjecting our software to conditions we do not intend, the terms of many open source licenses have not been interpreted by U.S. courts, and there is a risk that these licenses could be construed in a way that could impose unanticipated conditions or restrictions on our ability to commercialize our product or operate our business. By the terms of certain open source licenses, we could be required to release the source code of our software and to make our proprietary software available under open source licenses, if we combine or distribute our software with open source software in a certain manner. In the event that portions of our software are determined to be subject to an open source license, we could be required to publicly release the affected portions of our source code, re-engineer all, or a portion of, that software or otherwise be limited in the licensing of our software, each of which could reduce or eliminate the value of our product. Many of the risks associated with usage of open source software cannot be eliminated, and could negatively affect our business, results of operations and financial condition.
Risks Related to Our Common Stock
Our stock price may be volatile, and the value of our common stock may decline.
The market price of our common stock may fluctuate substantially and depends on a number of factors, including those described in this “Risk Factors” section, many of which are beyond our control and may not be related to our operating performance. Factors that could cause fluctuations in the market price of our common stock include the following:

• | actual or anticipated changes or fluctuations in our operating results;

• | the financial projections we may provide to the public, any changes in these projections or our failure to meet these projections;

• | announcements by us or our competitors of new products or new or terminated significant contracts, commercial relationships or capital commitments;

• | industry or financial analyst or investor reaction to our press releases, other public announcements and filings with the SEC;

• | rumors and market speculation involving us or other companies in our industry;

• | price and volume fluctuations in the overall stock market from time to time;

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• | changes in operating performance and stock market valuations of other technology companies generally, or those in our industry in particular;

• | the expiration of market stand-off or contractual lock-up agreements and sales of shares of our common stock by us or our stockholders;

• | failure of industry or financial analysts to maintain coverage of us, changes in financial estimates by any analysts who follow our company, or our failure to meet these estimates or the expectations of investors;

• | actual or anticipated developments in our business or our competitors’ businesses or the competitive landscape generally;

• | litigation involving us, our industry or both, or investigations by regulators into our operations or those of our competitors;

• | developments or disputes concerning our intellectual property rights or our solutions, or third-party proprietary rights;

• | announced or completed acquisitions of businesses or technologies by us or our competitors;

• | new laws or regulations or new interpretations of existing laws or regulations applicable to our business;

• | any major changes in our management or our board of directors;

• | general economic conditions and slow or negative growth of our markets; and

• | other events or factors, including those resulting from war, incidents of terrorism or responses to these events.

Recently, the stock markets have experienced extreme price and volume fluctuations that have affected and continue to affect the market prices of equity securities of many companies. These fluctuations have often been unrelated or disproportionate to the operating performance of those companies. Broad market and industry fluctuations, as well as general economic, political, regulatory and market conditions, may negatively impact the market price of our common stock. In the past, companies that have experienced volatility in the market price of their securities have been subject to securities class action litigation. We may be the target of this type of litigation in the future, which could result in substantial costs and divert our management’s attention.
An active public trading market may not continue to develop or be sustained.
Prior to our initial public offering, or IPO, in July 2018, there was no public market or active private market for our common stock. Following our IPO, an active public trading market may not continue to develop or be sustained. The lack of an active market may impair your ability to sell your shares at the time you wish to sell them or at a price that you consider reasonable. The lack of an active market may also reduce the fair value of your shares. An inactive market may also impair our ability to raise capital to continue to fund operations by selling shares and may impair our ability to acquire other companies or technologies by using our shares as consideration.
If securities or industry analysts do not publish research or reports about our business, or publish negative reports about our business, our stock price and trading volume could decline.
The trading market for our common stock will depend, in part, on the research and reports that securities or industry analysts publish about us or our business. We do not control these analysts or the content and opinions included in their reports. As a new public company, we may be slow to attract research coverage and the analysts who publish information about our common stock will have had relatively little experience with our company, which could affect their ability to accurately forecast our results and make it more likely that we fail to meet their estimates. If our financial performance fails to meet analyst estimates or one or more of the analysts who cover us downgrade our shares or change their opinion of our shares, our share price would likely decline. In addition, the stock prices of many companies in the technology industry have declined significantly after those companies have failed to meet, or significantly exceed, the financial guidance publicly announced by the companies or the expectations of analysts. If our financial results fail to meet, or exceed, our announced guidance or the expectations of analysts or public investors, analysts could downgrade our common stock or publish unfavorable research about us. If one or more of these analysts cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which could cause our share price or trading volume to decline.
Future sales of substantial amounts of our common stock in the public markets, or the perception that they might occur, could reduce the price that our common stock might otherwise attain.
Sales of a substantial number of shares of our common stock in the public market, or the perception that these sales might occur, could depress the market price of our common stock, impair our ability to raise capital through the sale of additional equity securities and make it more difficult for you to sell your common stock at a time and price that you deem appropriate. Shares of our common stock owned by our directors, executive officers and substantially all of
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our stockholders are restricted as a result of securities laws, lock-up agreements or other contractual restrictions that restrict transfers until January 2019, which is 180 days after the date of our IPO. Subject to certain limitations, 80,179,454 shares of our common stock will be eligible for sale upon the expiration of this 180-day lock-up period. The underwriters in our IPO may, in their sole discretion, permit our stockholders who are subject to these lock-up agreements to sell shares prior to the expiration of the lock-up agreements.
Additionally, stockholders holding 70,927,042 shares of our common stock outstanding, will, after the expiration of the lock-up periods specified above, have the right, subject to various conditions and limitations, to include their shares of our common stock in registration statements relating to our securities. If the offer and sale of these shares are registered, they will be freely tradable without restriction under the Securities Act. Shares of common stock sold under such registration statements can be freely sold in the public market. In the event such registration rights are exercised and a large number of shares of common stock are sold in the public market, such sales could reduce the trading price of our common stock.
In addition, in the future we may issue common stock or other securities convertible into shares of our common stock from time to time in connection with a financing, acquisition, investment or otherwise. The number of new shares of our common stock issued in connection with raising additional capital could constitute a material portion of the then outstanding shares of our common stock, which could result in substantial dilution to our existing stockholders and cause the market price of our common stock to decline.
Concentration of ownership among our existing directors, executive officers and holders of 5% or more of our outstanding common stock may prevent new investors from influencing significant corporate decisions, including the ability to influence the outcome of director elections and other matters requiring stockholder approval.
Our executive officers, directors and current beneficial owners of 5% or more of our common stock beneficially own a significant percentage of our outstanding common stock. These persons, acting together, will be able to significantly influence all matters requiring stockholder approval, including the election and removal of directors and any merger or other significant corporate transactions. The interests of this group of stockholders may not coincide with the interests of other stockholders.
The requirements of being a public company may strain our resources, divert management’s attention and affect our ability to attract and retain qualified board members.
As a public company, we are subject to the reporting and corporate governance requirements of the Exchange Act, the listing requirements of the Nasdaq Stock Market and other applicable securities rules and regulations, including the Sarbanes-Oxley Act and the Dodd-Frank Wall Street Reform and Consumer Protection Act. Compliance with these rules and regulations increases our legal and financial compliance costs, makes some activities more difficult, time-consuming or costly and increases demand on our systems and resources, particularly after we are no longer an “emerging growth company” as defined in the JOBS Act. Among other things, the Exchange Act requires that we file annual, quarterly and current reports with respect to our business and results of operations and maintain effective disclosure controls and procedures and internal control over financial reporting. In order to improve our disclosure controls and procedures and internal control over financial reporting to meet this standard, significant resources and management oversight may be required. As a result, management’s attention may be diverted from other business concerns, which could harm our business, financial condition, results of operations and prospects. Although we have already hired and are in the process of hiring, additional personnel to help comply with these requirements, we may need to further expand our legal and finance departments in the future, which will increase our costs and expenses.
In addition, changing laws, regulations and standards relating to corporate governance and public disclosure are creating uncertainty for public companies, increasing legal and financial compliance costs and making some activities more time-consuming. These laws, regulations and standards are subject to varying interpretations, in many cases due to their lack of specificity, and, as a result, their application in practice may evolve over time as new guidance is provided by regulatory and governing bodies. This could result in continuing uncertainty regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices. We intend to invest resources to comply with evolving laws, regulations and standards, and this investment may result in increased general and administrative expense and a diversion of management’s time and attention from revenue-generating activities to compliance activities. If our efforts to comply with new laws, regulations and standards differ from the activities intended by regulatory or governing bodies, regulatory authorities may initiate legal proceedings against us and our business and prospects may be harmed. As a result of disclosure of information in the filings required of a
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public company, our business and financial condition will become more visible, which may result in threatened or actual litigation, including by competitors and other third parties. If such claims are successful, our business, financial condition, results of operations and prospects could be materially harmed, and even if the claims do not result in litigation or are resolved in our favor, these claims, and the time and resources necessary to resolve them, could divert the resources of our management and materially harm our business, financial condition, results of operations and prospects.
We also expect that being a public company and these new rules and regulations will make it more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced coverage or incur substantially higher costs to obtain coverage. These factors could also make it more difficult for us to attract and retain qualified executive officers and members of our board of directors, particularly to serve on our audit committee and compensation committee.
In addition, as a result of our disclosure obligations as a public company, we will have reduced strategic flexibility and will be under pressure to focus on short-term results, which may materially and adversely affect our ability to achieve long-term profitability.
We do not intend to pay dividends for the foreseeable future and, as a result, your ability to achieve a return on your investment will depend on appreciation in the price of our common stock.
We have never declared or paid any cash dividends on our common stock and do not intend to pay any cash dividends in the foreseeable future. We anticipate that we will retain all of our future earnings for use in the development of our business and for general corporate purposes. Any determination to pay dividends in the future will be at the discretion of our board of directors. Accordingly, investors must rely on sales of their common stock after price appreciation, which may never occur, as the only way to realize any future gains on their investments. In addition, our loan and security agreement with Silicon Valley Bank contains restrictive covenants that prohibit us, subject to certain exceptions, from paying dividends on our common stock.
As a result of being a public company, we are obligated to develop and maintain proper and effective internal controls over financial reporting and any failure to maintain the adequacy of these internal controls may adversely affect investor confidence in our company and, as a result, the value of our common stock.
We are required, pursuant to Section 404 of the Sarbanes-Oxley Act, or Section 404, to furnish a report by management on, among other things, the effectiveness of our internal control over financial reporting for the year ending December 31, 2019. This assessment will need to include disclosure of any material weaknesses identified by our management in our internal control over financial reporting. In addition, our independent registered public accounting firm will be required to attest to the effectiveness of our internal control over financial reporting in our first annual report required to be filed with the SEC following the date we are no longer an “emerging growth company.” We will be required to disclose significant changes made in our internal control procedures on a quarterly basis.
We have commenced the costly and challenging process of compiling the system and processing documentation necessary to perform the evaluation needed to comply with Section 404, and we may not be able to complete our evaluation, testing and any required remediation in a timely fashion. Our compliance with Section 404 will require that we incur substantial accounting expense and expend significant management efforts. We currently do not have an internal audit group, and we will need to hire additional accounting and financial staff with appropriate public company experience and technical accounting knowledge and compile the system and process documentation necessary to perform the evaluation needed to comply with Section 404.
During the evaluation and testing process of our internal controls, if we identify one or more material weaknesses in our internal control over financial reporting, we will be unable to assert that our internal control over financial reporting is effective. We cannot assure you that there will not be material weaknesses or significant deficiencies in our internal control over financial reporting in the future. Any failure to maintain internal control over financial reporting could severely inhibit our ability to accurately report our financial condition or results of operations. If we are unable to conclude that our internal control over financial reporting is effective, or if our independent registered public accounting firm determines we have a material weakness or significant deficiency in our internal control over financial reporting, we could lose investor confidence in the accuracy and completeness of our financial reports, the market price of our common stock could decline, and we could be subject to sanctions or investigations by the Nasdaq, the SEC or other regulatory authorities. Failure to remedy any material weakness in our internal control over financial reporting, or to
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implement or maintain other effective control systems required of public companies, could also restrict our future access to the capital markets.
Anti-takeover provisions in our charter documents and under Delaware law could make an acquisition of us more difficult, limit attempts by our stockholders to replace or remove members of our board of directors and our current management and could negatively impact the market price of our common stock.
Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that could delay or prevent a change in control of our company. These provisions could also make it difficult for stockholders to elect directors that are not nominated by the current members of our board of directors or take other corporate actions, including effecting changes in our management. These provisions include:

• | a classified board of directors with three-year staggered terms, which could delay the ability of stockholders to change the membership of a majority of our board of directors;

• | the ability of our board of directors to issue shares of preferred stock and to determine the price and other terms of those shares, including preferences and voting rights, without stockholder approval, which could be used to significantly dilute the ownership of a hostile acquirer;

• | the exclusive right of our board of directors to elect a director to fill a vacancy created by the expansion of our board of directors or the resignation, death or removal of a director, which prevents stockholders from being able to fill vacancies on our board of directors;

• | a prohibition on stockholder action by written consent, which forces stockholder action to be taken at an annual or special meeting of our stockholders;

• | the requirement that a special meeting of stockholders may be called only by the chairperson of our board of directors, chief executive officer or president (in the absence of a chief executive officer) or a majority vote of our board of directors, which could delay the ability of our stockholders to force consideration of a proposal or to take action, including the removal of directors;

• | the requirement for the affirmative vote of holders of at least 66 2/3% of the voting power of all of the then outstanding shares of the voting stock, voting together as a single class, to amend the provisions of our amended and restated certificate of incorporation relating to the issuance of preferred stock and management of our business or our amended and restated bylaws, which may inhibit the ability of an acquirer to affect such amendments to facilitate an unsolicited takeover attempt;

• | the ability of our board of directors, by majority vote, to amend our amended and restated bylaws, which may allow our board of directors to take additional actions to prevent an unsolicited takeover and inhibit the ability of an acquirer to amend our amended and restated bylaws to facilitate an unsolicited takeover attempt; and

• | advance notice procedures with which stockholders must comply to nominate candidates to our board of directors or to propose matters to be acted upon at a stockholders’ meeting, which may discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise attempting to obtain control of us.

These provisions may prohibit large stockholders, in particular those owning 15% or more of our outstanding voting stock, from merging or combining with us for a certain period of time.
Our amended and restated certificate of incorporation provides that the Court of Chancery of the State of Delaware or the U.S. federal district courts will be the exclusive forums for substantially all disputes between us and our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers or other employees.
Our amended and restated certificate of incorporation provides that the Court of Chancery of the State of Delaware is the sole and exclusive forum for any derivative action or proceeding brought on our behalf, any action asserting a breach of fiduciary duty owed by any of our directors, officers or other employees to us or our stockholders, any action asserting a claim against us arising pursuant to any provisions of the Delaware General Corporation Law, our amended and restated certificate of incorporation or our amended and restated bylaws, or any action asserting a claim against us that is governed by the internal affairs doctrine. Our amended and restated certificate of incorporation further provides that the U.S. federal district courts will be the exclusive forum for resolving any complaint asserting a cause of action arising under the Securities Act. These choice of forum provisions may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors, officers or other employees, which may discourage such lawsuits. Some companies that adopted a similar federal district court forum selection provision are currently subject to a suit in the Chancery Court of Delaware by stockholders who assert that the provision is not enforceable. If a court were to find either choice of forum provision contained in our amended and
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restated certificate of incorporation to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could adversely affect our results of operations and financial condition.
We are an “emerging growth company” and we cannot be certain if the reduced reporting and disclosure requirements applicable to emerging growth companies will make our common stock less attractive to investors.
We are an “emerging growth company,” as defined in the JOBS Act, and we may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not “emerging growth companies” including, but not limited to, the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. We may take advantage of these exemptions until we are no longer an emerging growth company. We would cease to be an emerging growth company upon the earliest to occur of: (1) January 1, 2024, which is the beginning of the first fiscal year following the fifth anniversary of our IPO; (2) the first fiscal year after our annual gross revenue is $1.07 billion or more; (3) the date on which we have, during the previous three-year period, issued more than $1.0 billion in non-convertible debt securities; or (4) as of the end of any fiscal year in which the market value of our common stock held by non-affiliates exceeded $700.0 million as of the end of the second quarter of that fiscal year. We cannot predict if investors will find our common stock less attractive if we choose to rely on these exemptions. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and our stock price may be more volatile.
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
Unregistered Sales of Equity Securities
None.
Use of Proceeds
On July 30, 2018, we completed our IPO, in which we issued and sold 12,535,000 shares of common stock at a price to the public of $23.00 per share, including 1,635,000 shares of common stock purchased by our underwriters pursuant to the full exercise of their over-allotment option to purchase additional shares. The offer and sale of all of the shares in the IPO were registered under the Securities Act pursuant to a registration statement on Form S-1 (File No. 333-226002), which was declared effective by the SEC on July 25, 2018.
Morgan Stanley & Co. LLC, J.P. Morgan Securities LLC, Allen & Company LLC and Deutsche Bank Securities Inc. acted as active book-running managers for the offering. Stifel, Nicolaus & Company, Incorporated acted as passive book-running manager for the offering, and William Blair & Company, L.L.C. and BTIG, LLC acted as co-managers for the offering. The offering commenced on July 25, 2018 and did not terminate before all securities registered in the registration statement were sold.
We received net proceeds of $264.8 million after deducting underwriting discounts and commissions and offering expenses. No offering expenses were paid directly or indirectly to any of our directors, officers or persons owning ten percent or more of our capital stock (or their associates or affiliates).
There has been no material change in the planned use of the IPO proceeds as described in our Prospectus.
Items 3, 4 and 5 are not applicable and have been omitted.
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Item 6. Exhibits
The following is a list of Exhibits filed as part of this Quarterly Report on Form 10-Q:

Exhibit Number |  | Description |  | Location
3.1 |  | Amended and Restated Certificate of Incorporation of Tenable Holdings, Inc. |  | Previously filed as Exhibit 3.1 to the Company's Current Report on Form 8-K (File No. 001-38600) on July 30, 2018
3.2 |  | Amended and Restated Bylaws of Tenable Holdings, Inc. |  | Previously filed as Exhibit 3.4 to the Company's Registration Statement on Form S-1 (File No. 333-226002) on June 29, 2018
4.1 |  | Common Stock Certificate of Tenable Holdings, Inc. |  | Previously filed as Exhibit 4.1 to the Company's Registration Statement on Form S-1 (File No. 333-226002) on July 16, 2018
31.1 |  | Certification of the Principal Executive Officer pursuant to Rules 13a-14(a) and 15d-14(a) under the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 |  | Filed herewith
31.2 |  | Certification of the Principal Financial Officer pursuant to Rules 13a-14(a) and 15d-14(a) under the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 |  | Filed herewith
32.1* |  | Certification of the Principal Executive Officer and the Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 |  | Filed herewith
101.SCH |  | XBRL Taxonomy Extension Schema Document. |  |
101.CAL |  | XBRL Taxonomy Extension Calculation Linkbase Document. |  |
101.DEF |  | XBRL Taxonomy Extension Definition Linkbase Document. |  |
101.LAB |  | XBRL Taxonomy Extension Label Linkbase Document. |  |
101.PRE |  | XBRL Taxonomy Extension Presentation Linkbase Document. |  |

________________
(*) This certification is deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.
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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

|  | TENABLE HOLDINGS, INC.
Date: | November 7, 2018 | By: | /s/ Amit Y. Yoran
|  |  | Amit Y. Yoran
|  |  | President, Chief Executive Officer and Chairman
|  |  | (Principal Executive Officer)
Date: | November 7, 2018 | By: | /s/ Stephen A. Vintz
|  |  | Stephen A. Vintz
|  |  | Chief Financial Officer
|  |  | (Principal Financial Officer and Principal Accounting Officer)

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