X0304 4 2011-10-27 0001084755 ARIBA INC ARBA 0001440658 Rubaie Ahmed C/O ARIBA, INC. 910 HERMOSA COURT SUNNYVALE CA 94085 0 1 0 0 Chief Financial Officer Common Stock 949 I Through 401(k) Plan Common Stock 2011-10-27 4 A 0 34715 0 A 148861 D Common Stock 2011-10-27 4 A 0 95156 0 A 234017 D Includes shares acquired by Mr. Rubaie on 09/30/2011 through participation in Ariba's 401K Retirement program. 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. 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. Ahmed Rubaie 2011-10-31