Exhibit 99.1 Sourcefire(R) Announces 2007 Third Quarter Results Third Quarter 2007 Revenues Grow Over 36% from Year Ago Level; Gross Margin Remains Strong at 77% COLUMBIA, Md.--(BUSINESS WIRE)--Nov. 6, 2007--Open source innovator and Snort(R) creator, Sourcefire, Inc. (Nasdaq:FIRE), a leader in network intrusion prevention, today announced financial results for its third fiscal quarter ended September 30, 2007. Commenting on the third quarter results, Wayne Jackson, Sourcefire's Chairman and CEO stated, "We are pleased with our sales execution this quarter, securing 34 six-figure transactions and 86 repeat customer purchases. Also this quarter, we introduced the latest version of the Sourcefire 3D(TM) System, released two new products, completed our acquisition of ClamAV, expanded into the Australian market and made great progress toward the release of our innovative 10 gigabit solution." Financial Highlights -- Total Revenues - Revenues for the third quarter of 2007 were $14.8 million, compared to $10.9 million in the third quarter of 2006, an increase of 36%. Revenues for the nine months ended September 30, 2007 were $36.5 million, compared to $28.9 million for the same period last year, an increase of 26%. -- Gross Profit - Gross profit for the third quarter of 2007 increased 36% to $11.3 million, or 77% of revenues, compared to $8.3 million, or 77% of revenues, in the third quarter of 2006. Gross profit for the nine months ended September 30, 2007 increased 29% to $28.4 million, or 78% of revenues, compared to $22.0 million, or 76% of revenues, for the same period last year. -- Net Income/Loss - On the basis of generally accepted accounting principles (GAAP), the Company's net loss for the third quarter of 2007 was $2.8 million, compared with net income of $0.2 million in the third quarter of 2006. GAAP net loss for the nine months ended September 30, 2007 was $6.4 million, compared with a GAAP net loss of $2.9 million for the same period last year. The GAAP net loss for the third quarter of 2007 and the nine months ended September 30, 2007 included a charge of $2.9 million for in-process research and development costs related to the acquisition of ClamAV, with no such charges in the same period in 2006. The GAAP earnings per share effect of this charge was $0.12 per share in the third quarter and $0.15 per share for the nine months ended September 30, 2007. -- Net Loss Attributable to Common Stockholders - GAAP net loss attributable to common stockholders, which includes the accretion of our preferred stock up until the time of our initial public offering, was approximately $2.8 million in the third quarter of 2007, or a loss of $0.12 per share, compared with GAAP net loss attributable to common stockholders of $0.9 million, or a loss of $0.27 per share, in the third quarter of 2006. GAAP net loss attributable to common stockholders for the nine months ended September 30, 2007 was $7.3 million, or a loss of $0.38 per share, compared with a GAAP net loss attributable to common stockholders of $5.6 million, or a loss of $1.67 per share, for the same period last year. -- Balance Sheet - As of September 30, 2007 total cash, cash equivalents and held to maturity investments totaled $103.3 million. Non-GAAP Measures In evaluating the operating performance of its business, Sourcefire's management excludes certain charges and credits that are required by GAAP. These non-GAAP results provide useful information to both management and investors by excluding expenses which we believe may not be indicative of the Company's core operating results. These items share one or more of the following characteristics: they are unusual and Sourcefire does not expect them to recur in the ordinary course of its business; they do not involve the expenditure of cash; or they are unrelated to the ongoing operation of the business in the ordinary course. These measures should be considered in addition to results prepared in accordance with GAAP, but should not be considered a substitute for, or superior to, GAAP results. The non-GAAP measures included in this press release have been reconciled to the nearest GAAP measure. -- Adjusted Net Income/Loss - Adjusted net income, which excludes stock-based compensation expense, the charge for in-process research and development costs related to the acquisition of ClamAV and amortization of acquired intangibles, was $0.8 million, or $0.03 per share, in the third quarter of 2007, compared to an adjusted net income of $0.3 million, or $0.10 per share, in the third quarter of 2006. Adjusted net loss was $1.6 million, or a loss of $0.08 per share, in the nine months ended September 30, 2007, compared to an adjusted net loss of $2.6 million, or a loss of $0.78 per share, for the same period last year. Recent Company Highlights -- Acquired ClamAV - With nearly 1 million unique IP addresses downloading ClamAV malware updates daily across more than 120 mirrors in 38 countries, ClamAV is one of the most broadly adopted open source security projects worldwide. ClamAV is comparable in quality and coverage to leading commercial anti-virus solutions and was recently named a finalist in the "Best Tool or Utility for SysAdmins" at the Sourceforge.net 2007 Community Choice Awards. -- General Availability of Sourcefire 3D(TM) System 4.7 - announced the availability of the Sourcefire 3D(TM) System version 4.7 release, affording customers with the industry's first-ever Adaptive IPS. While traditional IPS vendors have subscribed to a "one size fits all" model, the 3D System 4.7 release sets Sourcefire apart, enabling customers to optimize the security and performance of their IPS systems based on the actual network assets they are protecting. -- General Availability of Sourcefire RUA(TM) - Real-time User Awareness links user identity to security and compliance events. -- General Availability of Sourcefire NetFlow Analysis - which extends the reach of Sourcefire's Network Behavior Analysis (NBA) solution to corners of the network where Sourcefire RNA(TM) (Real-time Network Awareness) Sensors do not exist. -- Increased International Footprint with Australian Expansion - announced that the company is expanding its presence in Australia as part of a strategy to support the growing international demand for the company's innovative security solutions. Full Year 2007 Outlook Based on information as of November 5, 2007, Sourcefire is reiterating its revenue guidance for the full year of 2007 in the range of $55 million to $58 million and providing adjusted net income per share guidance in the range of $0.04 to $0.13, for the fiscal year ending December 31, 2007. Basic net loss per share on a GAAP basis attributable to common stockholders is now expected to be in the range of $0.17 to $0.26, for the fiscal year ending December 31, 2007, which now includes the $2.9 million charge for in-process research and development costs related to the acquisition of ClamAV, or $0.14 per share on an annualized basis. These estimates exclude any other extraordinary items. Conference Call and Webcast On Tuesday, November 6, 2007 at 5:00 p.m. Eastern Time, Sourcefire will host a conference call to review these results. A listen-only web cast of the session will be available at http://investor.sourcefire.com. Those wishing to participate in the live session should use the following numbers to dial in: Calling from the United States or Canada: 866-272-9941 Calling from other countries: 617-213-8895 Pass code: 72723188 An online replay will be available at http://investor.sourcefire.com following the completion of the live call and will remain available for at least 90 days. About Sourcefire Sourcefire, Inc. (Nasdaq:FIRE), Snort creator and open source innovator, is a world leader in Enterprise Threat Management (ETM) solutions. Sourcefire is transforming the way Global 2000 organizations and government agencies manage and minimize network security risks with its 3D Approach - Discover, Determine, Defend - to securing real networks. The Sourcefire 3D(TM) System is the first to unify IPS, NBA, NAC and Vulnerability Assessment technologies under the same management console. This ETM approach equips customers with an efficient and effective layered security defense - protecting network assets before, during and after an attack. Through the years, Sourcefire has been consistently recognized for its innovation and industry leadership by customers, media and industry analysts alike - with more than 30 awards and accolades. Today, the names Sourcefire and founder Martin Roesch have grown synonymous with innovation and network security intelligence. For more information about Sourcefire, please visit http://www.sourcefire.com. SOURCEFIRE(R), SNORT(R), the Sourcefire logo, the Snort and Pig logo, SECURITY FOR THE REAL WORLD(TM), SOURCEFIRE DEFENSE CENTER(TM), SOURCEFIRE 3D(TM), RNA(TM), DAEMONLOGGER(TM) and certain other trademarks and logos are trademarks or registered trademarks of Sourcefire, Inc. in the United States and other countries. Cautionary Language Concerning Forward-Looking Statements The statements contained in this release that are not historical facts are "forward-looking statements" (as such term is defined in the Private Securities Litigation Reform Act of 1995) that involve risks and uncertainties. These statements include our expectations regarding our financial results. Management cautions the reader that these forward-looking statements are only predictions and are subject to a number of both known and unknown risks and uncertainties, and actual results, performance, and/or achievements of Sourcefire, Inc. may differ materially from the future results, performance, and/or achievements expressed or implied by these forward-looking statements as a result of a number of factors. These factors include, without limitation, the fact that our outlook for the full year of 2007 and the fourth quarter of 2007 could change, and also include, without limitation, those risks and uncertainties described from time to time in the reports filed by Sourcefire, Inc. with the Securities and Exchange Commission. Sourcefire, Inc. undertakes no obligation to update any forward-looking statements. Sourcefire, Inc. Consolidated Statements of Operations (Unaudited) (amounts in thousands, except share and per share information) Three Months Ended Nine Months Ended September 30 September 30 ------------------------- ------------------------- 2007 2006 2007 2006 Revenue: Products $ 9,403 $ 6,927 $ 21,103 $ 18,390 Technical support and professional services 5,403 3,940 15,418 10,544 ------------ ------------ ------------ ------------ Total revenue 14,806 10,867 36,521 28,934 ------------ ------------ ------------ ------------ Cost of revenue: Products 2,665 1,813 5,809 4,931 Technical support and professional services 800 725 2,277 2,016 ------------ ------------ ------------ ------------ Total cost of revenue 3,465 2,538 8,086 6,947 ------------ ------------ ------------ ------------ Gross profit 11,341 8,329 28,435 21,987 Operating expenses: Research and development 2,895 2,082 8,076 6,334 Sales and marketing 6,746 4,929 18,563 14,512 General and administrative 2,540 1,103 7,288 3,587 Depreciation and amortization 427 306 1,177 912 In-process research and development 2,947 - 2,947 - ------------ ------------ ------------ ------------ Total operating expenses 15,555 8,420 38,051 25,345 ------------ ------------ ------------ ------------ Loss from operations (4,214) (91) (9,616) (3,358) Other income (expense): Interest and investment income 1,417 294 3,351 447 Interest expense - (20) (35) (61) Other income (expense) 3 22 (9) 56 ------------ ------------ ------------ ------------ Total other income (expense) 1,420 296 3,307 442 ------------ ------------ ------------ ------------ Income (loss) before income taxes (2,794) 205 (6,309) (2,916) Income tax expense (50) - (120) ------------ ------------ ------------ ------------ Net income (loss) (2,844) 205 (6,429) (2,916) Accretion of preferred stock - (1,131) (870) (2,687) ------------ ------------ ------------ ------------ Net loss attributable to common stockholders $ (2,844) $ (926) $ (7,299) $ (5,603) ============ ============ ============ ============ Net loss attributable to common stockholders per share: Basic and diluted $ (0.12) $ (0.27) $ (0.38) $ (1.67) Weighted average shares outstanding used in computing per share amounts: Basic and diluted 24,218,634 3,392,526 19,027,750 3,360,099 Note: Compensation cost under SFAS 123(R) for the three and nine months ended September 30, 2007 and 2006 is included in the consolidated Statements of Operations as follows (in thousands): (unaudited) Three Months Ended Nine Months Ended September 30 September 30 ------------------------- ------------------------- 2007 2006 2007 2006 Cost of sales (product) $ 11 $ - $ 16 $ - Cost of sales (services) 38 - 50 - ------------ ------------ ------------ ------------ Stock-based compensation expense included in cost of sales 49 - 66 - Research and development 88 20 257 43 Sales and marketing 300 55 755 119 General and administrative 282 67 833 120 ------------ ------------ ------------ ------------ Stock-based compensation included in operating expenses 670 142 1,845 282 ------------ ------------ ------------ ------------ Total stock- based compensation $ 719 $ 142 $ 1,911 $ 282 ============ ============ ============ ============ Sourcefire, Inc. Consolidated Balance Sheets (amounts in thousands, except share and per share data) September 30 December 31 2007 2006 ------------ ------------ (Unaudited) Assets Current assets: Cash and cash equivalents $ 27,217 $ 13,029 Held to maturity investments 70,204 12,385 Accounts receivable, net allowance for doubtful accounts of $147 in 2007 and $166 in 2006 13,920 16,507 Inventory 3,164 2,099 Prepaid expenses and other current assets 2,981 919 ------------ ------------ Total current assets 117,486 44,939 Property and equipment, net 3,848 2,546 Intangible assets, net 624 - Held-to-maturity investments, less current portion 5,916 908 Restricted cash 1,000 - Other assets 329 1,559 ------------ ------------ Total assets $ 129,203 $ 49,952 ============ ============ Liabilities, convertible preferred stock and stockholders' equity (deficit) Current liabilities: Accounts payable 1,936 3,081 Accrued compensation and related expenses 1,979 1,783 Other accrued expenses 1,170 1,312 Current portion of deferred revenue 13,362 11,735 Current portion of long-term debt - 675 Other current liabilities 721 501 ------------ ------------ Total current liabilities 19,168 19,087 Deferred revenue, less current portion 2,526 2,380 Long-term debt, less current portion - 637 Other long-term liabilities 83 - ------------ ------------ Total liabilities 21,777 22,104 Commitments and contingencies Series A convertible preferred stock, $0.001 par value; 2,495,410 shares authorized at December 31, 2006, 2,475,410 shares issued and outstanding at December 31, 2006; aggregate liquidation preference of $14,093 at December 31, 2006, no shares authorized, issued or outstanding at September 30, 2007 - 10,308 Warrants to purchase Series A convertible preferred stock - 25 Series B convertible preferred stock, $0.001 par value; 7,132,205 shares authorized, issued and outstanding at December 31, 2006; aggregate liquidation preference of $19,947 at December 31, 2006; no shares authorized, issued or outstanding at September 30, 2007 - 14,265 Series C convertible preferred stock, $0.001 par value; 5,404,043 shares authorized, issued and outstanding at December 31, 2006; aggregate liquidation preference of $26,050 at December 31, 2006; no shares authorized, issued or outstanding at September 30, 2007 - 18,270 Series D convertible preferred stock, $0.001 par value; 3,264,449 shares authorized, issued and outstanding at December 31, 2006; aggregate liquidation preference of $29,847 at December 31, 2006; no shares authorized, issued or outstanding at September 30, 2007 - 23,879 ------------ ------------ Total convertible preferred stock - 66,747 Stockholders' equity (deficit): Preferred stock, $0.001 par value; 20,000,000 shares authorized; no shares issued and outstanding at September 30, 2007 and December 31, 2006 - - Common stock, $0.001 par value; 240,000,000 shares authorized; 24,464,116 and 3,491,764 shares issued and outstanding at September 30, 2007 and December 31, 2006, respectively 24 3 Additional paid-in capital 152,733 - Accumulated deficit (45,331) (38,902) ------------ ------------ Total stockholders' equity (deficit) 107,426 (38,899) ------------ ------------ Total liabilities, convertible preferred stock and stockholders' equity (deficit) $ 129,203 $ 49,952 ============ ============ Sourcefire, Inc. Consolidated Statements of Cash Flows (Unaudited) (amounts in thousands) Nine Months Ended September 30 ------------------------------ 2007 2006 Operating activities Net loss $ (6,429) $ (2,916) Adjustments to reconcile net loss to net cash (used in) provided by operating activities: Depreciation and amortization 1,202 934 Provision for doubtful accounts (1) - Amortization of unearned compensation - 15 Stock-based compensation 1,911 267 Amortization of (premium) discount on held-to-maturity investments (933) 5 Write-off of acquired in-process research and development costs 2,947 - Changes in operating assets and liabilities: Accounts receivable 2,588 2,430 Inventory (1,065) (659) Prepaid expenses and other assets (1,871) (360) Accounts payable (1,145) (104) Accrued expenses 54 1,657 Deferred revenue 1,773 664 Other current liabilities 303 (21) -------------- -------------- Net cash (used in) provided by operating activities (666) 1,912 Investing activities Purchase of property and equipment (2,494) (815) Purchase of held-to-maturity investments (95,895) (1,401) Proceeds from maturities of held-to- maturity investments 34,000 2,000 Cash paid for acquisition of ClamAV, including direct acquisition cost of $81 (3,581) - Cash held in escrow related to acquisition of ClamAV (1,000) - -------------- -------------- Net cash used in investing activities (68,970) (216) Financing activities Borrowings of long-term debt 113 383 Repayments of long-term debt (1,424) (403) Proceeds from issuance of Series D Redeemable Convertible Preferred Stock, net of offering costs - 22,921 Proceeds from issuance of common stock, net of underwriters' discount of $6,495 86,288 - Proceeds from exercise of stock options 214 142 Payment of equity offering costs (1,367) (708) -------------- -------------- Net cash provided by financing activities 83,824 22,335 -------------- -------------- Net increase in cash and cash equivalents 14,188 24,031 Cash and cash equivalents at beginning of period 13,029 1,106 -------------- -------------- Cash and cash equivalents at end of period $ 27,217 $ 25,137 ============== ============== Sourcefire, Inc. Reconciliation of Non-GAAP Measures to GAAP (Unaudited) (amounts in thousands, except share and per share information) Three Months Ended Nine Months Ended September 30 September 30 ------------------------- ------------------------- 2007 2006 2007 2006 Reconciliation to adjusted net income (loss): Net income (loss) (2,844) 205 (6,429) (2,916) Stock-based compensation expense 719 142 1,911 282 In-process research and development 2,947 - 2,947 - Amortization of acquired intangibles 10 - 10 - ------------ ------------ ------------ ------------ Adjusted net income (loss) $ 832 $ 347 $ (1,561) $ (2,634) ============ ============ ============ ============ Adjusted net income (loss) per share - basic $ 0.03 $ 0.10 $ (0.08) $ (0.78) Weighted average number of shares - basic 24,218,634 3,392,526 19,027,750 3,360,099 CONTACT: Sourcefire, Inc. Investor Contact: Tania Almond Investor Relations Officer 410-423-1919 tania.almond@sourcefire.com or Media Contact: Welz & Weisel Communications Tony Welz Principal 703-218-3555 x226 tony@w2comm.com