Ownership Submission
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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(Print or Type Responses)
1. Name and Address of Reporting Person *
  McDonough Thomas M
 2. Date of Event Requiring Statement (Month/Day/Year)
03/08/2007		 3. Issuer Name and Ticker or Trading Symbol
SOURCEFIRE INC [FIRE]
(Last)
(First)
(Middle)
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)
President & COO
 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 441,502
I
Held by revocable trust (1)

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) 06/24/2006(2) 06/24/2015 Common Stock 92,364 $ 2.03 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
McDonough Thomas M
9770 PATUXENT WOODS DRIVE
COLUMBIA, MD 21046		       President & COO  

Signatures

/s/ Joseph M. Boyle as Attorney-in-Fact 03/08/2007
**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) Held by The Revocable Trust of Thomas Michael McDonough, u/a July 19, 2005, Thomas M. McDonough, Trustee. Mr. McDonough has voting and instrument control with respect to these shares.
(2) Options vest 25% on June 24, 2006 and in equal monthly installments of 2.083% over the subsequent three years. Options also accelerate and become fully vested if there is a change in control and the holder?s employment is terminated without cause within one year after the change in control subsequent to the change in control.

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