X0202 4 2007-12-03 0 0001391984 Data Domain, Inc. DDUP 0001402349 Scarpelli Michael C/O DATA DOMAIN 2300 CENTRAL EXPRESSWAY SANTA CLARA CA 95050 0 1 0 0 VP and Chief Financial Officer Common Stock 2007-12-03 4 M 0 3119 .75 A 136452 D Common Stock 2007-12-03 4 S 0 3119 25.89 D 133333 D Employee Stock Option (right to buy) .75 2007-12-03 4 M 0 3119 0 D 2016-09-13 Common Stock 3119 454096 D The shares were sold upon a partial exercise of the over-allotment option by the underwriters, pursuant to the prospectus filed with the SEC on 11/16/2007. 95,762 shares are immediately exercisable. 133,333 shares become exercisable on January 1, 2008, 133,333 shares become exercisable on January 1, 2009 and the remaining 91,668 shares become exercisable on January 1, 2010. The shares remaining unvested on this option will vest in equal monthly installments, ending September 13, 2010. /s/ Michael Scarpelli by Robert G. Specker, Attorney-in-Fact 2007-12-05