X0306 4 2013-07-25 1 0001042825 POWER ONE INC PWER 0001211787 MCKNIGHT TINA D 740 CALLE PLANO CAMARILLO CA 93012 0 1 0 0 Sr. Gen. Counsel and Secretary Common Stock 2013-07-25 4 D 0 252165 6.35 D 0 D Non-Qualified Stock Option 7.54 2013-07-25 4 D 0 37500 D 2020-06-01 Common Stock 37500 0 D Non-Qualified Stock Option 8.08 2013-07-25 4 D 0 40000 D 2021-05-03 Common Stock 40000 0 D Non-Qualified Stock Option 4.265 2013-07-25 4 D 0 101000 2.085 D 2022-04-30 Common Stock 101000 0 D Reflects 57,474 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"). This option, which provides 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 10,497 shares of ABB American Depositary Shares ("ADSs") for $26.94 per ADS. This option, which provides for vesting in three equal installments beginning on May 3, 2012, was assumed by ABB in the Merger and replaced with an option to purchase 11,197 ADSs for $28.87 per ADS. This option, which provides for vesting in three equal installments beginning on April 30, 2013, was canceled in the Merger in exchange for a cash payment of $210,585.00, representing the difference between the exercise price of the option and the merger consideration paid for the Common Stock underlying such option. /s/ Tina D. McKnight 2013-07-29