-- Revenue of $63.6 million, up 44% year-over-year -- Calculated current billings of $77.4 million, up 39% year-over-year -- Added 282 new logo enterprise platform customers, up 30% year-over-year -- Raised $265 million of net proceeds in initial public offering in July

COLUMBIA, Md., Sept. 05, 2018 (GLOBE NEWSWIRE) -- Tenable Holdings, Inc. (“Tenable”) (Nasdaq:TENB), the Cyber Exposure company, today announced financial results for the quarter ended June 30, 2018.

“We are pleased with the strength of our second quarter results, highlighted by 44% year-over-year growth in revenue and 39% year-over-year growth in calculated current billings,” said Amit Yoran, Chairman and CEO of Tenable. “Our rapid growth was driven by strong worldwide demand for our enterprise platform offerings, SecurityCenter and Tenable.io, and by the increasing strategic importance of Cyber Exposure. Looking ahead, we are well positioned to capitalize on this multi-billion dollar market opportunity and help companies manage their cybersecurity risk as they undergo digital transformation.”

Second Quarter 2018 Financial Highlights

-- Revenue of $63.6 million represented a 44% increase year-over-year. -- Calculated current billings was $77.4 million representing a 39% increase year-over-year. -- GAAP loss from operations was $16.4 million, compared to a loss of $9.2 million in the second quarter of 2017. -- Non-GAAP loss from operations was $13.3 million, compared to a loss of $7.2 million in the second quarter of 2017. -- GAAP net loss per share was $0.73, compared to GAAP net loss per share of $0.43 in the second quarter of 2017. -- Pro forma non-GAAP net loss per share, which gives effect to the conversion of outstanding preferred common stock as of the beginning of the period, was $0.18, compared to pro forma non-GAAP loss per share of $0.09 in the second quarter of 2017. -- Cash and cash equivalents was $23.7 million as of June 30, 2018. Our initial public offering in July generated net proceeds of $265 million, net of underwriting discounts and commissions and offering expenses. -- Net cash provided by operating activities was $0.2 million, compared to net cash used of $(1.0) million in the second quarter of 2017. -- Free cash flow was $(1.1) million, compared to $(1.2) million in the second quarter of 2017.

Second Quarter 2018 Business Highlights

-- Announced the industry’s first solution designed to reduce cybersecurity risk across today’s converged IT/Operational Technology ("OT") environments, including enhancements to Tenable.io® and our Industrial Security offering, that is delivered in partnership with Siemens. -- Added 282 new logo enterprise platform customers, up 30% year-over-year, and added 33 net new six figure annual recurring revenue customers to reach over 340 in total. -- Tenable Research discovered a new vulnerability in critical infrastructure at a time when OT systems have become high-value targets for cybercriminals around the world. -- Unveiled original research citing that cybercriminals have a seven-day window of opportunity to exploit a vulnerability before security teams launch initial assessments for the new vulnerability. This lag time further highlights the criticality of measuring and managing Cyber Exposure to eliminate the attackers' advantage. -- Tenable.io won best vulnerability management solution at the 2018 SC Awards Europe.

Financial Outlook

For the third quarter of 2018, we currently expect:

-- Revenue in the range of $66.0 million to $66.5 million. -- Non-GAAP loss from operations in the range of $17.5 million to $16.5 million. -- Non-GAAP net loss in the range of $17.1 million to $16.1 million. -- Pro forma non-GAAP net loss per share in the range of $0.19 to $0.18, assuming 88.7 million weighted average shares outstanding.

For the year ending December 31, 2018, we currently expect:

-- Revenue in the range of $260.0 million to $261.0 million. -- Calculated current billings in the range of $314.0 million to $316.0 million. -- Non-GAAP loss from operations in the range of $60.7 million to $58.7 million. -- Non-GAAP net loss in the range of $61.2 million to $59.2 million. -- Pro forma non-GAAP net loss per share in the range of $0.72 to $0.70, assuming 84.8 million weighted average shares outstanding.

Conference Call Information

Tenable will host a conference call at 5:00 p.m Eastern Time to discuss its financial results. The conference call can be accessed at 877-407-9716 (U.S.) and 201-493-6779 (international). A live webcast of the event will be available on the Tenable Investor Relations website at https://investors.tenable.com. A replay of the webcast will be available until September 19, 2018.

About Tenable

Tenable® is the Cyber Exposure company. Over 24,000 organizations around the globe rely on Tenable to understand and reduce cyber risk. As the creator of Nessus®, Tenable extended its expertise in vulnerabilities to deliver Tenable.io®, the world’s first platform to see and secure any digital asset on any computing platform. Tenable customers include more than 50 percent of the Fortune 500, more than 25 percent of the Global 2000 and large government agencies. Learn more at tenable.com.

Contact Information

Investor RelationsAndrea DiMarcoinvestors@tenable.com

Media RelationsCayla Bakertenablepr@tenable.com

Forward-Looking Statements

This press release includes forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. All statements contained in this press release other than statements of historical fact, including statements regarding our future results of operations and financial position, business strategy and plans and objectives for future operations, are forward-looking statements and represent our views as of the date of this press release. The words “anticipate,” believe,” “continue,” “estimate,” “expect,” “intend,” “may,” “will” and similar expressions are intended to identify forward-looking statements. We have based these forward-looking statements on our current expectations and projections about future events and financial trends that we believe may affect our financial condition, results of operations, business strategy, short-term and long-term business operations and objectives and financial needs. These forward-looking statements are subject to a number of assumptions and risks and uncertainties, many of which involve factors or circumstances that are beyond our control that could affect our financial results. These risks and uncertainties are detailed in the sections titled "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our prospectus dated July 25, 2018, as filed with the Securities and Exchange Commission ("SEC") on July 26, 2018 pursuant to Rule 424(b) under the Securities Act of 1933, as amended, which is available on the SEC's website at www.sec.gov. Additional information will be made available in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2018 and other filings that we make from time to time with the SEC. Moreover, we operate in a very competitive and rapidly changing environment. New risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the future events and trends discussed in this press release may not occur and actual results could differ materially and adversely from those anticipated or implied in any forward-looking statements. Except as required by law, we are under no obligation to update these forward-looking statements subsequent to the date of this press release, or to update the reasons if actual results differ materially from those anticipated in the forward-looking statements.

Non-GAAP Financial Measures and Other Key Metrics

To supplement our consolidated financial statements, which are prepared and presented in accordance with GAAP, we use certain 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 non-GAAP financial measures provide useful information about our 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 non-GAAP metrics to assist investors in seeing our 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 financial performance over multiple periods with other companies in our industry.

Reconciliations of non-GAAP financial measures to the most directly comparable GAAP financial measures are included in the financial tables accompanying this press release. Reconciliations of forward-looking non-GAAP financial measures are not available because certain of the expense cannot be reasonably calculated or predicted at this time.

Non-GAAP Loss from Operations and Non-GAAP Operating Margin: We define these non-GAAP financial measures as their respective GAAP measures, excluding the effect of stock-based compensation and amortization of intangible assets. We believe that these non-GAAP financial measures provide useful information about our core operating results over multiple periods.

Non-GAAP Net Loss, Non-GAAP Net Loss Per Share and Pro Forma Non-GAAP Net Loss Per Share: We define non-GAAP net loss as GAAP net loss attributable to common shareholders, excluding the effect of the accretion of Series A and B redeemable convertible preferred stock, stock-based compensation and amortization of intangible assets, including the applicable tax impact. We use non-GAAP net loss 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.

Non-GAAP Gross Profit and Non-GAAP Gross Margin: We define non-GAAP gross profit as GAAP gross profit, excluding the effect of stock-based compensation and amortization of intangible assets. Non-GAAP gross margin is defined as non-GAAP gross profit as a percentage of revenue. We believe that these non-GAAP financial measures provide useful information about our core operating results over multiple periods.

Non-GAAP Sales and Marketing Expense, Non-GAAP Research and Development Expense and Non-GAAP General and Administrative Expense: We define these non-GAAP measures as their respective GAAP measures, excluding stock-based compensation. We believe that these non-GAAP financial measures provide useful information about our core operating results over multiple periods.

Calculated Current Billings: We define calculated current billings, a non-GAAP financial measure, as total revenue recognized in a period plus the change in current deferred revenue in the corresponding period. We believe that calculated current billings is a key metric to measure our periodic performance. Given that most of our customers pay in advance (including multi-year contracts), but we generally recognize 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. 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.

Free Cash Flow: We define free cash flow, a non-GAAP financial measure, as net cash provided by (used in) operating activities less 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.

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

Three Months Ended June Six Months Ended June 30, 30, (in thousands, except per share data) 2018 2017 2018 2017 ----------- ---------- ----------- ----------- Revenue $ 63,592 $ 44,149 $ 122,699 $ 84,630 Cost of revenue(1) 9,879 5,348 18,607 9,786 Gross profit 53,713 38,801 104,092 74,844 Operating expenses: Sales and marketing(1) 41,826 27,773 81,414 53,941 Research and development(1) 17,791 13,713 34,976 26,171 General and administrative(1) 10,541 6,544 19,596 12,707 Total operating expenses 70,158 48,030 135,986 92,819 --------- - -------- - --------- - --------- - Loss from operations (16,445 ) (9,229 ) (31,894 ) (17,975 ) Other (expense) income, net (461 ) 56 (469 ) 27 Loss before income taxes (16,906 ) (9,173 ) (32,363 ) (17,948 ) Provision for income taxes 244 41 675 92 Net loss and comprehensive loss (17,150 ) (9,214 ) (33,038 ) (18,040 ) Accretion of Series A and B redeemable convertible preferred (191 ) (191 ) (379 ) (378 ) stock --------- - -------- - --------- - --------- - Net loss attributable to common stockholders $ (17,341 ) $ (9,405 ) $ (33,417 ) $ (18,418 ) - ------- - - ------ - - ------- - - ------- - Net loss per share attributable to common stockholders, $ (0.73 ) $ (0.43 ) $ (1.41 ) $ (0.85 ) basic and diluted - ------- - - ------ - - ------- - - ------- - Weighted-average shares used to compute net loss per share 23,750 22,060 23,623 21,661 attributable to common stockholders, basic and diluted --------- - -------- - --------- - --------- -

_______________

(1) Includes stock-based compensation as follows:

Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 -------- ----------------- -------- --------------- Cost of revenue $ 114 $ 50 $ 191 $ 104 Sales and marketing 675 358 1,277 628 Research and development 640 452 1,167 846 General and administrative 1,595 989 2,788 1,897 Total stock-based compensation $ 3,024 $ 1,849 $ 5,423 $ 3,475 - ----- - ----- --------- - ----- - ----- -------

TENABLE HOLDINGS, INC.CONSOLIDATED BALANCE SHEETS

June 30, December 2018 31, 2017 ----------- ----------- (in thousands, except per share data) (unaudited) Assets Current assets: Cash and cash equivalents $ 23,655 $ 27,210 Accounts receivable (net of allowance for doubtful accounts of $261 and $160 at June 49,930 50,881 30, 2018 and December 31, 2017, respectively) Deferred commissions 19,078 17,170 Prepaid expenses and other current assets 13,324 15,994 --------- - --------- - Total current assets 105,987 111,255 Property and equipment, net 11,240 10,754 Construction in progress 12,253 2,252 Deferred commissions (net of current portion) 31,727 33,006 Intangible assets, net 729 1,031 Goodwill 265 265 Other assets 7,157 5,774 Total assets $ 169,358 $ 164,337 - ------- - - ------- - Liabilities, Redeemable Convertible Preferred Stock and Stockholders’ Deficit Current liabilities: Accounts payable $ 1,457 $ 338 Accrued expenses 7,462 4,878 Accrued compensation 15,862 18,482 Deferred revenue 174,277 154,898 Other current liabilities 1,932 1,750 --------- - --------- - Total current liabilities 200,990 180,346 Deferred revenue (net of current portion) 72,860 70,920 Financing obligation 11,803 1,802 Other liabilities 4,315 5,199 --------- - --------- - Total liabilities 289,968 258,267 Redeemable convertible Series A preferred stock (par value: $0.01; 15,848 shares authorized, issued, and outstanding with liquidation preference of $50,000 at June 49,946 49,935 30, 2018 and December 31, 2017) Redeemable convertible Series B preferred stock (par value: $0.01; 42,000 shares authorized, 39,538 issued and outstanding with liquidation preference of $230,008 at 228,168 227,800 June 30, 2018 and December 31, 2017) Stockholders’ deficit: Common stock (par value: $0.01; 93,848 and 93,855 shares authorized at June 30, 2018 and December 31, 2017; 24,951 and 24,472 shares issued and outstanding at June 30, 250 246 2018 and December 31, 2017) Additional paid-in capital 26,651 20,676 Accumulated deficit (425,625 ) (392,587 ) --------- - --------- - Total stockholders’ deficit (398,724 ) (371,665 ) Total liabilities, redeemable convertible preferred stock and stockholders’ deficit $ 169,358 $ 164,337 - ------- - - ------- -

TENABLE HOLDINGS, INC.CONSOLIDATED STATEMENTS OF CASH FLOWS(unaudited)

Six Months Ended June 30, (in thousands) 2018 2017 ----------- ----------- Cash flows from operating activities: Net loss $ (33,038 ) $ (18,040 ) Adjustments to reconcile net loss to net cash provided by operating activities: Depreciation and amortization 2,994 2,121 Stock-based compensation 5,423 3,475 Deferred income taxes — 318 Other 664 (39 ) Changes in operating assets and liabilities: Accounts receivable 850 (1,205 ) Prepaid expenses and other current assets 2,625 (205 ) Deferred commissions (629 ) (6,134 ) Other assets 1,260 219 Accounts payable and accrued expenses 2,326 1,846 Accrued compensation (2,620 ) (878 ) Deferred revenue 21,319 19,468 Other current liabilities (3 ) (517 ) Other liabilities (425 ) (261 ) Net cash provided by operating activities 746 168 Cash flows from investing activities: Purchases of property and equipment (2,978 ) (681 ) --------- - --------- - Net cash used in investing activities (2,978 ) (681 ) Cash flows from financing activities: Principal payments under capital lease obligations (252 ) (90 ) Credit facility issuance costs — (238 ) Payments of deferred offering costs (1,515 ) — Proceeds from the exercise of stock options 1,010 2,467 Repurchases of common stock (75 ) (385 ) --------- - --------- - Net cash (used in) provided by financing activities (832 ) 1,754 Effect of exchange rate changes on cash and cash equivalents and restricted cash (491 ) 45 Net (decrease) increase in cash and cash equivalents and restricted cash (3,555 ) 1,286 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 $ 23,917 $ 35,756 - ------- - - ------- -

TENABLE HOLDINGS, INC.RECONCILIATION OF GAAP TO NON-GAAP FINANCIAL MEASURES(dollars in thousands)(unaudited)

Three Months Ended June Six Months Ended June 30, Non-GAAP Loss from Operations and Non-GAAP Operating 30, Margin 2018 2017 2018 2017 ------------ ----------- ------------ ------------ Loss from operations $ (16,445 ) $ (9,229 ) $ (31,894 ) $ (17,975 ) Stock-based compensation 3,024 1,849 5,423 3,475 Amortization of intangible assets 151 151 302 302 Non-GAAP loss from operations $ (13,270 ) $ (7,229 ) $ (26,169 ) $ (14,198 ) - ------- -- - ------ -- - ------- -- - ------- -- Operating margin (26 )% (21 )% (26 )% (21 )% Non-GAAP operating margin (21 )% (16 )% (21 )% (17 )%

Three Months Ended June Six Months Ended June Non-GAAP Net Loss, Non-GAAP Net Loss Per Share and Pro forma 30, 30, Non-GAAP Loss Per Share 2018 2017 2018 2017 ----------- ---------- ----------- ----------- Net loss attributable to common stockholders $ (17,341 ) $ (9,405 ) $ (33,417 ) $ (18,418 ) Accretion of Series A and B redeemable convertible preferred 191 191 379 378 stock Stock-based compensation 3,024 1,849 5,423 3,475 Tax impact of stock-based compensation(1) (25 ) (12 ) (48 ) (22 ) Amortization of intangible assets(1) 151 151 302 302 Non-GAAP net loss $ (14,000 ) $ (7,226 ) $ (27,361 ) $ (14,285 ) - ------- - - ------ - - ------- - - ------- - Net loss per share attributable to common stockholders, $ (0.73 ) $ (0.43 ) $ (1.41 ) $ (0.85 ) basic and diluted Accretion of Series A and B redeemable convertible preferred 0.01 0.01 0.02 0.02 stock Stock-based compensation 0.12 0.08 0.22 0.16 Tax impact of stock-based compensation(1) — — — — Amortization of intangible assets(1) 0.01 0.01 0.01 0.01 Non-GAAP net loss per share, basic and diluted $ (0.59 ) $ (0.33 ) $ (1.16 ) $ (0.66 ) - ------- - - ------ - - ------- - - ------- - Weighted-average shares used to compute net loss per share 23,750 22,060 23,623 21,661 attributable to common stockholders, basic and diluted Pro forma adjustment to reflect assumed conversion of our convertible redeemable preferred stock as of the beginning 55,386 55,386 55,386 55,386 of the period ----------- ----------- Weighted-average shares used to compute pro forma non-GAAP 79,136 77,446 79,009 77,047 net loss per share, basic and diluted Pro forma non-GAAP net loss per share $ (0.18 ) $ (0.09 ) $ (0.35 ) $ (0.19 ) - ------- - - ------ - - ------- - - ------- -

________________

(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 maintained a full valuation allowance.

Three Months Ended Six Months Ended June June 30, 30, Calculated Current Billings 2018 2017 2018 2017 ---------- ---------- ----------- ---------- Revenue $ 63,592 $ 44,149 $ 122,699 $ 84,630 Deferred revenue (current), end of period 174,277 122,190 174,277 122,190 Deferred revenue (current), beginning of period(1) (160,503 ) (110,605 ) (154,898 ) (107,006 ) Calculated current billings $ 77,366 $ 55,734 $ 142,078 $ 99,814 - ------ - - ------ - - ------- - - ------ -

________________

(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.

Three Months Ended Six Months Ended June 30, June 30, Free Cash Flow 2018 2017 2018 2017 ---------- ---------- ---------- -------- Net cash provided by (used in) operating activities $ 242 $ (1,019 ) $ 746 $ 168 Purchases of property and equipment (1,382 ) (221 ) (2,978 ) (681 ) Free cash flow $ (1,140 ) $ (1,240 ) $ (2,232 ) $ (513 ) - ------ - - ------ - - ------ - - ---- -

Three Months Ended Six Months Ended June June 30, 30, Non-GAAP Gross Profit and Non-GAAP Gross Margin 2018 2017 2018 2017 ---------- ---------- ----------- ---------- Gross profit $ 53,713 $ 38,801 $ 104,092 $ 74,844 Stock-based compensation 114 50 191 104 Amortization of intangible assets 151 151 302 302 -------- - -------- - --------- - -------- - Non-GAAP gross profit $ 53,978 $ 39,002 $ 104,585 $ 75,250 - ------ - - ------ - - ------- - - ------ - Gross margin 84 % 88 % 85 % 88 % Non-GAAP gross margin 85 % 88 % 85 % 89 %

Three Months Ended June 30, Six Months Ended June 30, Non-GAAP Sales and Marketing Expense 2018 2017 2018 2017 --------- ---------------- --------- -------------- Sales and marketing expense $ 41,826 $ 27,773 $ 81,414 $ 53,941 Less: Stock-based compensation 675 358 1,277 628 Non-GAAP sales and marketing expense $ 41,151 $ 27,415 $ 80,137 $ 53,313 - ------ - ------ ------- - ------ - ------ -----

Three Months Ended June 30, Six Months Ended June 30, Non-GAAP Research and Development Expense 2018 2017 2018 2017 --------- ---------------- --------- -------------- Research and development expense $ 17,791 $ 13,713 $ 34,976 $ 26,171 Less: Stock-based compensation 640 452 1,167 846 Non-GAAP research and development expense $ 17,151 $ 13,261 $ 33,809 $ 25,325 - ------ - ------ ------- - ------ - ------ -----

Three Months Ended June 30, Six Months Ended June 30, Non-GAAP General and Administrative Expense 2018 2017 2018 2017 --------- ---------------- --------- -------------- General and administrative expense $ 10,541 $ 6,544 $ 19,596 $ 12,707 Less: Stock-based compensation 1,595 989 2,788 1,897 Non-GAAP general and administrative expense $ 8,946 $ 5,555 $ 16,808 $ 10,810 - ------ - ----- -------- - ------ - ------ -----