X0303 4 2010-02-24 0 0001168195 SOURCEFIRE INC FIRE 0001200878 BURRIS JOHN C C/O SOURCEFIRE, INC. 9770 PATUXENT WOODS DRIVE COLUMBIA MD 21046 1 1 0 0 Chief Executive Officer Common Stock 2010-02-24 4 A 0 17250 0.00 A 133788 D Common Stock 2010-02-24 4 A 0 5750 0.00 A 139538 D Stock option (right to buy) 23.80 2010-02-24 4 A 0 30000 0.00 A 2020-02-24 Common Stock 30000 30000 D This grant of restricted stock units was approved by the issuer's compensation committee on February 24, 2010, subject to the reporting person's execution of a restricted stock unit award agreement. Each restricted stock unit represents a contingent right to receive one share of common stock of the issuer. The shares underlying these restricted stock units are eligible for vesting in four equal annual installments beginning on February 24, 2011, 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 February 24, 2015, the fifth anniversary of the grant date, subject to the reporting person's continuous service with the issuer on such date. The shares underlying these restricted stock units vest in four equal annual installments beginning on February 24, 2011, subject to the reporting person's continuous service with the issuer as of the vesting date. The option will vest over a period of four years, with 25% of the shares underlying the option vesting on February 24, 2011, the first anniversary of the date of grant and the remainder vesting in 36 equal monthly installments thereafter. /s/ Brian F. Leaf, attorney-in-fact 2010-02-25