X0303 4 2010-10-28 0001084755 ARIBA INC ARBA 0001183228 CALDERONI ROBERT C/O ARIBA, INC. 807 11TH AVENUE SUNNYVALE CA 94089 1 1 0 0 Chairman and CEO Common Stock 2010-10-28 4 A 0 422502 0 A 426864 D Common Stock 2010-10-28 4 A 0 378713 0 A 805577 D This transaction reflects with respect to the number of shares reported achievement of the fiscal year 2010 performance goals applicable to the reporting person's fiscal year 2009 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 2010 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. Robert Calderoni 2010-11-01