X0306 4 2014-03-07 1 0000730000 SUPERTEX INC SUPX 0001195890 CHOY BENEDICT C K 1235 BOARDEAUX DR. SUNNYVALE CA 94089 1 1 0 0 SVP Common Stock 2014-03-07 5 G 0 E 50000 0.00 D 73697 D Common Stock 2014-03-07 5 G 0 E 50000 0.00 A 50000 I By Benedict and Louisa Choy Charitable Remainder Trust Common Stock 2014-03-13 5 G 0 E 5000 0.00 D 68697 D Common Stock 2014-04-01 4 D 0 68697 33.00 D 0 D Common Stock 2014-04-01 4 D 0 50000 33.00 D 0 I By Benedict and Louisa Choy Charitable Remainder Trust Stock Option (right to buy) 35.86 2014-04-01 4 D 0 15000 0.00 D 2017-09-03 Common Stock 15000 0 D Stock Option (right to buy) 20.85 2014-04-01 4 D 0 50000 12.15 D 2018-11-30 Common Stock 50000 0 D Stock Option (right to buy) 19.51 2014-04-01 4 D 0 20000 D 2021-08-30 Common Stock 20000 0 D On March 7, 2014, the reporting person contributed 50,000 shares of Supertex, Inc. (the "Issuer") common stock to a charitable remainder trust of which the reporting person is a trustee and of which the reporting person and his wife are beneficiaries. The reporting person continues to report beneficial ownership of all the Issuer common stock held by the trust but disclaims beneficial ownership except to the extent of his and his wife's pecuniary interest therein. Includes 13,697 shares of Issuer common stock held by 1998 Choy Living Trust and 60,000 shares held by Choy Legacy Trust. Includes 8,697 shares of Issuer common stock held by 1998 Choy Living Trust and 60,000 shares held by Choy Legacy Trust. Disposed of pursuant to that certain Agreement and Plan of Merger dated as of February 9, 2014 (the "Merger Agreement"), by and among the Issuer, Microchip Technology Incorporated, a Delaware corporation ("Microchip"), and Orchid Acquisition Corporation, a California corporation and a wholly owned subsidiary of Microchip ("Merger Sub"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer surviving the merger as a wholly owned subsidiary of Microchip (the "Merger"), in exchange for $33.00 per share (the "Merger Consideration") on the effective date of the Merger. This option is fully vested. Pursuant to the Merger Agreement, this out of the money option was canceled. This option becomes exercisable at the rate of 50% of the underlying shares on the third anniversary of the grant date, with 50% vesting the following year. Pursuant to the Merger Agreement, this option was cancelled and converted in to the right to receive a cash payment equal to the number of shares of the Issuer's common stock underlying this option multiplied by the amount, if any, that $33.00 exceeded the exercise price of the this option, less any applicable withholding taxes. Pursuant to the Merger Agreement, this option was converted into an option to acquire the number of shares of Microchip common stock determined by multiplying the number of shares of Issuer common stock subject to this option by 0.697, with an exercise price per share determined by dividing the exercise price per share of this option by 0.697, and otherwise subject to substantially the same terms and conditions as applied to this option. /s/ Benedict C. K. Choy 2014-04-03