X0304 4 2011-10-27 0001084755 ARIBA INC ARBA 0001342273 Parker Kent ARIBA, INC. 910 HERMOSA COURT SUNNYVALE CA 94085 0 1 0 0 Chief Operating Officer Common Stock 2011-10-27 4 A 0 34715 0 A 177946 D Common Stock 2011-10-27 4 A 0 95156 0 A 273102 D Common Stock 3125 I Through 401(k) Plan Includes shares acquired by Mr. Parker on 9/30/2011 through participation in Ariba's 401K Retirement Account. This transaction reflects, with respect to the number of shares reported, aachievement of the fiscal year 2011 performance goals applicable to the reporting person's fiscal year 2010 Performance Stock 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 Stock Unit award. Service-based vesting conditions continue to apply to this award. Kent Parker 2011-10-28