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 * Negron John   2. Issuer Name and Ticker or Trading Symbol SOURCEFIRE INC [FIRE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP, Worldwide Sales (Last) (First) (Middle) 9770 PATUXENT WOODS DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 03/05/2013 (Street) COLUMBIA, MD 21046 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 03/05/2013   M   1,041 (1) A $ 27.51 59,335 D   Common Stock 03/05/2013   S   1,041 (2) D $ 55 58,294 D   Common Stock (3) 03/05/2013   A   3,920 (4) A $ 0 62,214 D   Common Stock (3) 03/05/2013   A   11,762 (5) A $ 0 73,976 D   Common Stock 03/06/2013   S   1,451 (6) D $ 55.965 72,525 D   Common Stock 03/07/2013   S   1,294 (2) D $ 55.97 71,231 D

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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

Stock Option (right to buy)

$ 27.51

03/05/2013

M

1,041

(7)

04/04/2018

Common Stock

1,041

$ 0

26,047

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Negron John 9770 PATUXENT WOODS DRIVE COLUMBIA, MD 21046			SVP, Worldwide Sales

Signatures

/s/ Brian F. Leaf, Attorney-in-fact		03/07/2013
**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)	The option exercise reported was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 30, 2012.
(2)	The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 30, 2012.
(3)	The security represents restricted stock units granted to the reporting person. Each restricted stock unit represents a contingent right to receive one share of common stock of the issuer.
(4)	The shares underlying these restricted stock units vest in four equal annual installments beginning on March 5, 2014, the first anniversary of the grant date, subject to the reporting person's continuous service with the issuer as of the vesting date.
(5)	The shares underlying these restricted stock units are eligible for vesting in four equal annual installments beginning on March 5, 2014, the first anniversary of the grant date. Subject to the reporting person's continuous service with the issuer as of such date, the number of shares eligible for vesting on each vesting date will vest based upon the issuer's meeting or exceeding specified annual financial objectives set by the issuer's compensation committee for such year. In the event the financial objectives for a particular year are not achieved, then the shares that otherwise would have vested on such vesting date will vest on March 5, 2018, the fifth anniversary of the grant date, subject to the reporting person's continuous service with the issuer on such date.
(6)	The sales reported were effected pursuant to a Rule 10b5-1 trading plan dated August 17, 2012 to satisfy tax obligations in connection with the non-reportable vesting of restricted stock units.
(7)	The option vests over a period of four years, with 25% of the shares underlying the option vesting on April 5, 2012, the first anniversary of the date of grant, and the remainder vesting in 36 equal monthly installments thereafter, subject to the reporting person's continuous service with the issuer as of the applicable vesting date.

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