FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * GULERI TIM   2. Issuer Name and Ticker or Trading Symbol SOURCEFIRE INC [FIRE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2884 SAND HILL ROAD, SUITE 100 3. Date of Earliest Transaction (Month/Day/Year) 12/13/2007 (Street) MENLO PARK, CA 94025 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 12/13/2007   S   300 D $ 7.85 67,935 I Held by trust (1) Common Stock 12/13/2007   S   1,500 D $ 7.8 66,435 I Held by trust (1) Common Stock 12/13/2007   S   2,516 D $ 7.81 63,919 I Held by trust (1) Common Stock 12/13/2007   S   1,584 D $ 7.82 62,335 I Held by trust (1) Common Stock 12/13/2007   S   100 D $ 7.83 62,235 I Held by trust (1) Common Stock 12/13/2007   S   300 D $ 7.84 61,935 I Held by trust (1) Common Stock 12/13/2007   S   300 D $ 7.86 61,635 I Held by trust (1) Common Stock 12/13/2007   S   223 D $ 7.87 61,412 I Held by trust (1) Common Stock               9,838 I Held by limited liability company (2) (3) Common Stock               1,112,213 I Held by limited liablity partnership (4) (5) Common Stock               8,209 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
GULERI TIM 2884 SAND HILL ROAD SUITE 100 MENLO PARK, CA 94025	X

Signatures

/s/ Tim Guleri		12/14/2007
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Shares are held by the Guleri Family Trust UTD dated April 7, 1999 (the "Guleri Trust"). The Reporting Person is a trustee and beneficiary of the Guleri Trust.
(2)	Consists of 3,496 shares held in the name of Sierra Ventures Associates VII, LLC ("SVA VII"), as nominee on behalf of the Guleri Trust, and 6,342 shares held in the name of Sierra Ventures Associates VIII, LLC ("SVA VIII"), as nominee on behalf of the Guleri Trust. In his most recent report, the Reporting Person reported beneficial ownership of 22,796 shares held in the name of SVA VII, as nominee on behalf of Reporting Person, and 49,229 shares held in the name of SVA VIII, as nominee on behalf of Reporting Person. However, the Reporting Person incorrectly indicated in his most recent report that these shares were held as nominee by SVA VII and SVA VIII on behalf of the Reporting Person when, in fact, the shares were held as nominee by SVA VII and SVA VIII on behalf of the Guleri Trust. (Continues onto Footnote 3)
(3)	(Continued from Footnote 2) Of these shares, 19,300 shares were subsequently distributed to the Guleri Trust by SVA VII and 42,887 shares were subsequently distributed to the Guleri Trust by SVA VIII, in each case in a transaction that effected a mere change in form of beneficial ownership.
(4)	Consists of 1,101,495 shares held by Sierra Ventures VIII-A, L.P. ("Sierra VIII-A") and 10,718 shares held by Sierra Ventures VIII-B, L.P. ("Sierra VIII-B"). SVA VIII is the general partner of Sierra VIII-A and Sierra VIII-B and possesses voting and dispositive power over the shares held by Sierra VIII-A and Sierra VIII-B. The Reporting Person is a managing member of SVA VIII. The Reporting Person disclaims beneficial ownership of the shares held by Sierra VIII-A and Sierra VIII-B, except to the extent of his pecuniary interest therein. In his most recent report, the Reporting Person reported beneficial ownership of 2,992,458 shares held by Sierra VIII-A and 29,183 shares held by Sierra VIII-B and disclaimed beneficial ownership thereof except to the extent of his pecuniary interest therein. (Continues onto Footnote 5)
(5)	(Continued from Footnote 4) Of these shares, 6,048 shares were subsequently distributed to the Guleri Trust in pro rata distributions, and 1,903,380 were subsequently distributed to other partners of Sierra VIII-A and Sierra VIII-B in pro rata distributions.

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