SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* SIERRA VENTURES VIII A, LP (Last) (First) (Middle) 2884 SAND HILL ROAD, SUITE 100 (Street) MENLO PARK CA 94025 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol SOURCEFIRE INC [ FIRE ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 09/05/2007
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

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	09/05/2007		J(1)		2,874,450	D	$0.00	1,665,149	I	See footnote(s)(2)(3)

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 Securities Underlying Derivative Security (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: 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

1. Name and Address of Reporting Person* SIERRA VENTURES VIII A, LP (Last) (First) (Middle) 2884 SAND HILL ROAD, SUITE 100 (Street) MENLO PARK CA 94025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* SIERRA VENTURES VII LP/CA (Last) (First) (Middle) 2884 SAND HILL ROAD, SUITE 100 (Street) MENLO PARK CA 94025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director 10% Owner Officer (give title below) X Other (specify below) See footnote(s) (2)(3)

1. Name and Address of Reporting Person* SIERRA VENTURES ASSOCIATES VIII, LLC (Last) (First) (Middle) 2884 SAND HILL ROAD, SUITE 100 (Street) MENLO PARK CA 94025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director 10% Owner Officer (give title below) X Other (specify below) See footnote(s) (2)(3)

1. Name and Address of Reporting Person* SIERRA VENTURES ASSOCIATES VII, LLC (Last) (First) (Middle) 2884 SAND HILL ROAD, SUITE 100 (Street) MENLO PARK CA 94025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director 10% Owner Officer (give title below) X Other (specify below) See footnote(s) (2)(3)

1. Name and Address of Reporting Person* SIERRA VENTURES VIII B, LP (Last) (First) (Middle) 2884 SAND HILL ROAD, SUITE 100 (Street) MENLO PARK CA 94025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director 10% Owner Officer (give title below) X Other (specify below) See footnote(s) (2)(3)

Explanation of Responses:

1. Pro rata distribution from Sierra Ventures VII, L.P. ("Sierra VII"), Sierra Ventures VIII-A, L.P. ("Sierra VIII-A") and Sierra Ventures VIII-B, L.P. ("Sierra VIII-B") to their respective partners.

2. Includes 552,936 shares held by Sierra VII, 1,101,495 shares held by Sierra VIII-A and 10,718 shares held by Sierra VIII-B. Sierra Ventures Associates VII, LLC ("SVA VII") is the general partner of Sierra VII and possesses voting and dispositive power over the shares held by Sierra VII. SVA VII disclaims beneficial ownership of such shares except to the extent of its pecuniary interest therein. SVA VII also holds an additional 20,704 shares as nominee for its members. (continued onto Footnote 3)

3. (Continued from Footnote 2)...SVA VII does not have voting or dispositive power over such shares and disclaims beneficial ownership of such shares. 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. SVA VIII disclaims beneficial ownership of such shares except to the extent of its pecuniary interest therein. SVA VIII also holds an additional 35,069 shares as nominee for its members. SVA VIII does not have voting or dispositive power over such shares and disclaims beneficial ownership of such shares.

Remarks:

	/s/ Tim Guleri, as Managing Director of Sierra Ventures Associates VIII, LLC, as General Partner for Sierra Ventures VIII-A, L.P.	09/06/2007
	/s/ Dave Schwab, as Managing Director of Sierra Ventures Associates VII, LLC, as General Partner for Sierra Ventures VII, L.P.	09/06/2007
	/s/ Tim Guleri, as Managing Director of Sierra Ventures Associates VIII, LLC	09/06/2007
	/s/ Dave Schwab, as Managing Director of Sierra Ventures Associates VII, LLC	09/06/2007
	/s/ Tim Guleri, as Managing Director of Sierra Ventures Associates VIII, LLC, as General Partner for Sierra Ventures VIII-B, L.P.	09/06/2007
	** Signature of Reporting Person	Date
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