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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1168195	Sourcefire Inc	FIRE	Services-Computer Processing & Data Preparation (7374)	522289365

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1392155	P Todd Headley	C/O Sourcefire, Inc. 9770 Patuxent Woods Drive Columbia MD 21046	Chief Financial Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2010-09-08	10,000	$0.33	61,830	No	4	M	Direct
Common Stock	Disposition	2010-09-08	10,000	$28.01	51,830	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock option (right to buy)	Disposition	2010-09-08	10,000	$0.00	10,000	$0.33

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
5,911		2013-04-18	No	4	M	Direct

Footnotes

Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $27.67 to $28.24 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.
The shares underlying this option vested in equal quarterly installments over four years, commencing on April 21, 2003.