X0304 4 2011-11-15 0001084755 ARIBA INC ARBA 0001183228 CALDERONI ROBERT C/O ARIBA, INC. 910 HERMOSA COURT SUNNYVALE CA 94085 1 1 0 0 Chairman and CEO Common Stock 2011-11-15 4 F 0 217885 32.38 D 638575 D Common Stock 2011-11-15 4 S 0 275000 32.272 D 363575 D Common Stock 2011-11-16 4 S 0 17553 32.0868 D 346022 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 504,950 shares acquired pursuant to a fiscal year 2010 Performance Stock Unit (the acquisition of which shares were reported on a Form 4 for October 28, 2010 and October 27, 2011). Robert Calderoni 2011-11-17