X0306 4 2016-05-17 0001003642 IMPAX LABORATORIES INC IPXL 0000938048 CHAO ALLEN C/O IMPAX LABORATORIES, INC. 30831 HUNTWOOD AVENUE HAYWARD CA 94544 1 Common Stock 2016-05-17 4 A 0 4375 0 A 65070 D Common Stock 116000 I By Allen Chao Interest, Ltd. Common Stock 180000 I By Allen Chao and Lee-Hwa Chao Family Trust Common Stock 20000 I By MAL Investment Stock Option (Right to Buy) 30.33 2016-05-17 4 A 0 10575 0 A 2026-05-17 Common Stock 10575 10575 D The option fully vests on the earlier of (i) May 17, 2017, which is the first anniversary of the date of grant and (ii) one day before the date of the Company's next annual meeting of stockholders The filing of this Statement shall not be construed as an admission (a) that the person filing this Statement is, for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended, the beneficial owner of any equity securities covered by this Statement, or (b) that this Statement is legally required to be filed by such person. /s/ Mark A. Schlossberg, by Power of Attorney 2016-05-19