X0202 4 2004-08-11 0 0001003642 IMPAX LABORATORIES INC IPXL 0001245196 HSIAO CHARLES 1 0 0 0 Common stock 2004-08-11 2004-08-11 4 G 0 3347419 0 D 3129 D Common stock 2004-08-11 2004-08-11 4 G 0 3347419 0 A 3531605 I Family trust Options to buy common stock 0.824 1999-04-02 1999-04-02 4 A 0 333580 0.824 A 2000-04-02 2009-04-02 Common stock 333580 333580 D Options to buy common stock 5 2000-12-22 2000-12-22 4 A 0 60800 5 A 2001-12-22 2010-12-22 Common stock 60800 60800 D Options to buy common stock 6.72 2002-03-08 2002-03-08 4 A 0 100000 6.72 A 2003-03-08 2012-03-08 Common stock 100000 100000 D Options to buy common stock 3.04 2003-03-10 2003-04-04 4 A 0 75000 3.04 A 2004-03-10 2013-03-10 Common stock 75000 75000 D Options to buy common stock 23.05 2004-04-14 2004-04-20 4 A 0 75000 23.05 A 2005-04-14 2014-04-14 Common stock 75000 75000 D Gift of common stock to Charles & Pamela Hsiao TTEES 2004 Hsiao Family Trust U/D/T June 21, 2004. Charles & Pamela Hsiao TTEES 2004 Hsiao Family Trust U/D/T June 21,2004 Since the reporting person's last report, 184,186 shares previously owned directly have been contributed to a grantor-retained annuity trust. This is the date that the Company informed the recipient of the award. This is the day that the Company informed the recipient of the award. The information on this Form 4 was erroneously reported on a Form 3 on 8/13/04. The information is being resubmitted on 8/18/04 to be correctly reported on a Form 4 per instructions from the SEC legal department. Charles Hsiao 2004-08-13