Ownership Submission
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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(Print or Type Responses)
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)
C/O SOURCEFIRE, INC., 9770 PATUXENT WOODS DRIVE
3. Date of Earliest Transaction (Month/Day/Year)
05/28/2009
(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 05/28/2009   S   579 D $ 11.69 (1) 59,809 I Held by trust (2)
Common Stock 05/28/2009   S   24,335 (3) D $ 11.69 (1) 372,451 I Held by limited partnerships (4)
Common Stock               11,444 D  
Common Stock               9,838 I Held by limited liability companies (5)

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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
GULERI TIM
C/O SOURCEFIRE, INC.
9770 PATUXENT WOODS DRIVE
COLUMBIA, MD 21046
  X      

Signatures

 /s/ Tim Guleri   05/29/2009
**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) Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $11.50 to $12.01 per share. The Reporting Person undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
(2) Shares are held by the Guleri Family Trust UTD dated April 7, 1999 (the "Guleri Trust"). The Reporting Person is a trustee and beneficiary of the Guleri Trust.
(3) Includes 24,100 shares sold by Sierra Ventures VIII-A, L.P. ("Sierra VIII-A") and 235 shares held by Sierra Ventures VIII-B, L.P. ("Sierra VIII-B").
(4) Includes 368,864 shares held by Sierra VIII-A and 3,587 shares held by Sierra VIII-B. Sierra Ventures Associates VIII, LLC ("SVA VIII") serves as 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 and shares voting and dispositive power over the shares held by Sierra VIII-A and Sierra VIII-B. The Reporting Person disclaims beneficial ownership of the shares held by Sierra VIII-A and Sierra VIII-B, except to the extent of his proportionate pecuniary interest therein.
(5) Consists of 3,496 shares held in the name of Sierra Ventures Associates VII, LLC, as nominee on behalf of the Guleri Trust, and 6,342 shares held in the name of SVA VIII, as nominee on behalf of the Guleri Trust.

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