X0304 4 2011-10-27 0001084755 ARIBA INC ARBA 0001183230 COSTELLO KEVIN ARIBA, INC. 910 HERMOSA COURT SUNNYVALE CA 94085 0 1 0 0 President Common Stock 126 I by 401K Plan Common Stock 2011-10-27 4 A 0 59963 0 A 240278 D Common Stock 2011-10-27 4 A 0 190311 0 A 430589 D This transaction reflects, with respect to the number of shares reported, achievement of the fiscal year 2011 performance goals applicable to the reporting person's fiscal year 2010 Performance Stpock Unit award. Service-based vesting conditions continue to apply to this award. This transaction reflects, with respect to the number of shares reported, achievement of the fiscal year 2011 performance goals applicable to the reporting person's fiscal year 2011 Performance Stpock Unit award. Service-based vesting conditions continue to apply to this award. Includes shares acquired by Mr. Costello on 9/30/2011 through participation in Ariba's 401K Retirement Account. Kevin Costello 2011-10-28