X0303 4 2010-11-22 0001084755 ARIBA INC ARBA 0001183230 COSTELLO KEVIN ARIBA, INC. 807 11TH AVENUE SUNNYVALE CA 94089 0 1 0 0 President Common Stock 2010-11-22 4 F 0 120485 20.80 D 355716 D Common Stock 2010-11-24 4 S 0 18000 20.4876 D 337716 D Reflects shares withheld or surrendered to the Issuer to satisfy income and employment tax withholding obligations in accordance with Rule 16b-3 upon settlement/vesting of awards covering an aggregate of 294,990 shares, specifically with respect to the following awards: 16,665 shares acquired pursuant to a restricted stock award (the acquisition of which shares were reported on a Form 4 for October 15, 2007, the "2008 RS Award"); 83,324 shares acquired pursuant to a fiscal year 2008 Performance Stock Unit (the acquisition of which shares were reported on a Form 4 for October 23, 2008, the "2008 PSU"); and 195,001 shares acquired pursuant to a fiscal year 2009 Performance Stock Unit (the acquisition of which shares were reported on a Form 4 for October 28, 2010, the "2009 PSU"). Kevin Costello 2010-11-24