X0202 4 2007-08-22 0 0000730000 SUPERTEX INC supx 0001195890 CHOY BENEDICT C K 1 1 0 0 Senior Vice President common stock 2007-08-22 4 S 0 5000 34.9431 D 171555 D ISO Option (to exercise common stock). Exercise Price: $10.7500. Shares Granted: 9,000. 9,000 shares exercisable on 6/1/07. Expiration Date: 6/1/08. 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: 9/1/2011. Held Direct. Benedict C.K. Choy 2007-08-23