X0306 4 2013-07-25 1 0001042825 POWER ONE INC PWER 0001086523 THOMPSON RICHARD J 740 CALLE PLANO CAMARILLO CA 93012 1 1 0 0 Director, President & CEO Common Stock 2013-07-25 4 D 0 1460997 6.35 D 0 D Common Stock 2013-07-25 4 D 0 288466 6.35 D 0 I By Grat Non-Qualified Stock Option 2.38 2013-07-25 4 D 0 500000 3.97 D 2012-02-18 2018-02-18 Common Stock 500000 0 D Non-Qualified Stock Option 2.38 2013-07-25 4 D 0 250000 3.97 D 2012-02-18 2018-02-18 Common Stock 250000 0 D Non-Qualified Stock Option 4.265 2013-07-25 4 D 0 467000 2.085 D 2022-04-30 Common Stock 467000 0 D Non-Qualified Stock Option 7.54 2013-07-25 4 D 0 300000 D 2020-06-01 Common Stock 300000 0 D Non-Qualified Stock Option 8.08 2013-07-25 4 D 0 339000 D 2021-05-03 Common Stock 339000 0 D Reflects 284,279 shares of restricted stock units ("RSUs") granted to the reporting person. Such RSUs can be settled for the Issuer's common stock, par value $0.001 ("Common Stock") underlying such option, and vested immediately prior to the effective time of the merger of Verdi Acquisition Corporation, an indirect wholly owned subsidiary of ABB Ltd ("ABB"), with and into Issuer, with Issuer continuing as the surviving corporation (the "Merger") pursuant to the merger agreement by and among the foregoing entities (the "Merger Agreement"). The reporting person contributed these shares to a grantor retained annuity trust for the benefit of the reporting person. This option was canceled in the Merger in exchange for a cash payment of $1,985,000.00, representing the difference between the exercise price of the option and the merger consideration paid for the Common Stock underlying such option. This option was canceled in the Merger in exchange for a cash payment of $992,500.00, representing the difference between the exercise price of the option and the merger consideration paid for the Common Stock underlying such option. This option, which provided for vesting in three equal annual installments beginning on April 30, 2013, was canceled in the Merger in exchange for a cash payment of $973,695.00, representing the difference between the exercise price of the option and the merger consideration paid for the Common Stock underlying such option. This option, which provided for vesting in four equal installments beginning on June 1, 2011, was assumed by ABB in the Merger and replaced with an option to purchase 83,982 shares of ABB American Depositary Shares ("ADSs") for $26.94 per ADS. This option, which provided for vesting in three equal annual installments beginning on May 3, 2012, was assumed by ABB in the Merger and replaced with an option to purchase 94,900 ADSs for $28.87 per ADS. /s/ Tina D. McKnight, by power of attorney for Richard J. Thompson 2013-07-29