FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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 *   Margarites Nicholas G 2. Date of Event Requiring Statement (Month/Day/Year) 02/26/2008 3. Issuer Name and Ticker or Trading Symbol SOURCEFIRE INC [FIRE] (Last) (First) (Middle) C/O SOURCEFIRE, INC., 9770 PATUXENT WOODS DRIVE 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chief Accounting Officer 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) COLUMBIA, MD 21046 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 3,033 D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee stock option (right to buy)	  (1)	07/09/2013	Common Stock	35,445	$ 0.3248	D	Â
Employee stock option (right to buy)	  (2)	12/11/2013	Common Stock	6,157	$ 0.3248	D	Â
Employee stock option (right to buy)	  (3)	06/24/2015	Common Stock	6,157	$ 2.03	D	Â
Employee stock option (right to buy)	  (4)	10/19/2016	Common Stock	9,236	$ 9.4842	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Margarites Nicholas G C/O SOURCEFIRE, INC. 9770 PATUXENT WOODS DRIVE COLUMBIA, MD 21046	Â	Â	  Chief Accounting Officer	Â

Signatures

/s/ Brian F. Leaf, attorney-in-fact		02/28/2008
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	Of the shares subject to this option, 9,236 shares vested on May 30, 2004 and the remainder vested monthly thereafter through May 31, 2007.
(2)	Of the shares subject to this option, one-fourth vested on December 11, 2004 and the remainder vested monthly thereafter through December 11, 2007.
(3)	Of the shares subject to this option, one-fourth vested on June 24, 2006 and the remainder vest monthly thereafter through June 24, 2009 in equal monthly installments.
(4)	Of the shares subject to this option, one-fourth vested on October 19, 2007 and the remainder vest monthly thereafter through October 19, 2010 in equal monthly installments.
  Remarks: Exhibit List Exhibit 24.1 - Power of Attorney

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