X0202 5 2004-12-31 0 0 0 0001099414 TANOX INC TNOX 0001135041 CHANG NANCY T 10301 STELLA LINK HOUSTON TX 77025 1 1 1 0 President & CEO Common Stock, $.01 par value 2004-04-15 5 J 0 753260 0.00 D 574239 I By the Nancy Chang 2002 GRAT Common Stock, $.01 par value 2004-04-29 5 J 0 230801 0.00 D 343438 I By the Nancy Chang 2002 GRAT Common Stock, $.01 par value 2004-04-29 5 G 0 343438 0.00 D 0 I By the Nancy Chang 2002 GRAT Common Stock, $.01 par value 2004-04-15 5 J 0 194871 0.00 D 511949 I By the Nancy Chang 2003 GRAT Common Stock, $.01 par value 2004-06-08 5 J 0 6725 0.00 D 218750 I By the Nancy Chang 1992 GRAT Common Stock, $.01 par value 2004-04-15 5 J 0 948131 0.00 A 5485891 D Common Stock, $.01 par value 2004-04-29 5 J 0 230801 0.00 A 5716692 D Common Stock, $.01 par value 2004-06-08 5 J 0 6725 0.00 A 5723417 D Common Stock, $.01 par value 2004-07-30 5 J 0 2750000 0.00 D 2973417 D Common Stock, $.01 par value 2004-07-30 5 J 0 2750000 0.00 A 2750000 I By Robinhood II Limited Partnership Common Stock, $.01 par value 34816 I By AMC Ventures, L.P. On April 15, 2004, 753,260 shares were distributed from the Nancy Chang 2002 GRAT and 194,871 shares were distributed from the Nancy Chang 2003 GRAT to Ms. Chang and, accordingly, constitute only a change in form of ownership for purposes of Section 16. On April 29, 2004, 230,801 shares were transferred from the Nancy Chang 2002 GRAT to Ms. Chang and, accordingly, constitute only a change in form of ownership for purposes of Section 16. On June 8, 2004, 6,725 shares were transferred from the Nancy Chang 1992 GRAT to Ms. Chang and, accordingly, constitute only a change in form of ownership for purposes of Section 16. Of the shares held by Ms. Chang, she has entered into prepaid forward sales agreements to sell (i) 250,000 shares with closings to occur in mid-November 2007, and (ii) 500,000 shares with closings to occur on August 29, 2008. On July 30, 2004, Ms. Chang transferred 2,750,000 shares to the Robinhood II Limited Partnership. The general partner of Robinhood II Limited Partnership is Apex Enterprises, Inc., of which Ms. Chang is the president. Accordingly, this transfer constitutes only a change in form of ownership for purposes of Section 16. The general partner of AMC Ventures, L.P. is Apex Enterprises, Inc., of which Ms. Chang is the president. Nancy T. Chang 2005-02-14