X0202 4 2005-02-23 0 0000730000 SUPERTEX INC SUPX 0001195891 SIEGEL RICHARD E 10 LONG SPUR ST PORTOLA VALLEY CA 94028 1 1 0 0 Executive Vice President Common Stock 2005-02-23 4 M 0 2000 10.75 A 12539 D Common Stock 2005-02-28 4 S 0 2000 19.46 D 10539 D NQ Option, (to purchase common stock) 10.75 2005-02-23 4 M 0 2000 10.75 D 2002-06-01 2005-06-01 Common Stock 2000 47200 D NQ Option (to exercise common stock). Exercise Price: $10.7500. Shares Granted: 9,000. Shares Currently Exercised: 2,000. Shares Remaining: 0. Expiration Date: 6/1/05. Held Direct. ISO Option (to exercise common stock). Exercise Price: $10.750. Shares Granted: 45,000. Shares Exercisable: 18,000. 9,000 Shares Exercisable on 6/1/05. 9,000 Shares Exercisable on 6/1/06. 9,000 Shares Exercisable on 6/1/07. Expiration Date: 6/1/2008. Held Direct. NQ Option (to exercise common stock). Exercise Price: $15.5000. Shares Granted: 22,000. Shares Exercisable: 22,000. Expiration Date: 12/1/06. Held Direct. NQ Option (to exercise common stock). Exercise Price: $12.5300. Shares Granted: 22,000. Shares Exercisable: 7,200. 3,600 shares exercisable on 6/1/05. 11,200 shares exercisable on 6/1/06. Expiration Date: 6/1/2008. Held Direct. ISO Option (to exercise common stock). Exercise Price: $17.0600. Shares Granted: 10,000. Shares Exercisable: 0. 5,000 shares exercisable on 9/1/08. 5,000 shares exercisable on 9/1/09. Expiration Date: 9/1/11. Held Direct. Richard Siegel 2005-02-28