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) 03/14/2007 (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 03/14/2007   C   3,259,866 A (1) 3,259,866 I Held by limited partnership and limited liability company (2) Common Stock 03/14/2007   S   166,200 (3) D $ 15 3,093,666 I Held by limited partnership and limited liability company (4) 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
Series A Convertible Preferred Stock	(5)	03/14/2007		C			851,585	(5)	(1)	Common Stock	1,573,072	$ 0	0	I	Held by limited partnerships (6)
Series A Convertible Preferred Stock	(5)	03/14/2007		C			16,394	(5)	(1)	Common Stock	30,283	$ 0	0	I	Held by limited liability company (7)
Series B Convertible Preferred Stock	(8)	03/14/2007		C			1,275,957	(8)	(1)	Common Stock	785,682	$ 0	0	I	Held by limited partnerships (9)
Series B Convertible Preferred Stock	(8)	03/14/2007		C			32,419	(8)	(1)	Common Stock	19,962	$ 0	0	I	Held by limited liability company (10)
Series C Convertible Preferred Stock	(8)	03/14/2007		C			895,574	(8)	(1)	Common Stock	551,457	$ 0	0	I	Held by limited partnerships (11)
Series C Convertible Preferred Stock	(8)	03/14/2007		C			27,020	(8)	(1)	Common Stock	16,637	$ 0	0	I	Held by limited liability company (12)
Series D Convertible Preferred Stock	(8)	03/14/2007		C			445,779	(8)	(1)	Common Stock	274,492	$ 0	0	I	Held by limited partnerships (13)
Series D Convertible Preferred Stock	(8)	03/14/2007		C			13,450	(8)	(1)	Common Stock	8,281	$ 0	0	I	Held by limited liability company (14)

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/ Joseph M. Boyle as Attorney-in-Fact		03/16/2007
**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)	N/A.
(2)	Includes 3,153,946 shares held by Sierra Ventures VIII-A, L.P. ("Sierra VIII-A"), 30,757 shares held by Sierra Ventures VIII-B, L.P. ("Sierra VIII-B"), Sierra Ventures Associates VIII, LLC ("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 reported herein, except to the extent of his pecuniary interest therein. Additionally, includes 23,842 shares held in the name of Sierra Ventures Associates VII, LLC ("SVA VII"), as nominee on behalf of Reporting Person and 51,321 shares held in the name of SVA VIII, as nominee on behalf of Reporting Person.
(3)	Includes 161,488 shares held by Sierra VIII-A, 1,574 shares held by Sierra VIII-B, 1,046 shares disposed by SVA VII as nominee on behalf of Reporting Person, and 2,092 shares disposed by SVA VIII as nominee on behalf of Reporting Person.
(4)	Includes 2,992,458 shares held by Sierra VIII-A, and 29,183 shares held by 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 reported herein, except to the extent of his pecuniary interest therein. Additionally, includes 22,796 shares are held in the name of SVA VII, as nominee on behalf of Reporting Person and 49,229 shares are held in the name of SVA VIII, as nominee on behalf of Reporting Person.
(5)	These securities were automatically converted into Common Stock on a 1 to 1.84723 basis upon the closing of the Issuer?s initial public offering.
(6)	Includes 843,363 shares held by Sierra VIII-A, and 8,222 shares held by 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. SVA VIII also holds an additional 39,126 shares as nominee for its members. SVA VIII does not have voting or dispositive power over such shares. The reporting person disclaims beneficial ownership of the shares reported herein, except to the extent of his pecuniary interest therein.
(7)	5,465 shares are held in the name of SVA VII as nominee on behalf of Reporting Person and 10,929 shares are held in the name of SVA VIII, as nominee on behalf of Reporting Person.
(8)	These securities were automatically converted into Common Stock on a 1 to 0.61576 basis upon the closing of the Issuer?s initial public offering.
(9)	Includes 1,263,638 shares held by Sierra Ventures VIII-A and 12,319 shares held by Sierra Ventures 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. SVA III also holds an additional 94,544 shares as nominee for its members. SVA VIII does not have voting or dispositive power over such shares. The reporting person disclaims beneficial ownership of the shares reported herein, except to the extent of his pecuniary interest therein.
(10)	10,805 shares are held in the name of SVA VII, as nominee on behalf of Reporting Person and 21,614 shares are held in the name of SVA VIII, as nominee on behalf of Reporting Person.
(11)	Includes 886,928 shares held by Sierra VIII-A, and 8,646 shares held by 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. SVA VIII also holds an additional 106,871 shares as nominee for its members. SVA VIII does not have voting or dispositive power over such shares. The reporting person disclaims beneficial ownership of the shares reported herein, except to the extent of his pecuniary interest therein.
(12)	7,694 shares are held in the name of SVA VII, as nominee on behalf of Reporting Person and 19,326 shares are held in the name of SVA VIII, as nominee on behalf of Reporting Person.
(13)	Includes 441,455 shares held by Sierra Ventures VIII-A, and 4,324 shares held by Sierra Ventures 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. SVA VIII also holds an additional 53,196 shares as nominee for its members. SVA VIII does not have voting or dispositive power over such shares. The reporting person disclaims beneficial ownership of the shares reported herein, except to the extent of his pecuniary interest therein.
(14)	3,830 shares are held in the name of SVA VII, as nominee on behalf of Reporting Person and 9,620 shares are held in the name of SVA VIII, as nominee on behalf of Reporting Person.

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