X0306 4/A 2017-06-14 2017-06-21 0 0001300699 Athenex, Inc. ATNX 0001203602 CANNON MICHAEL D C/O ATHENEX, INC. 1001 MAIN STREET, SUITE 600 BUFFALO NY 14203 1 0 0 0 Stock Option (Right to Buy) 11.00 2017-06-14 4 A 0 18000 0.00 A 2027-06-14 Common Stock 18000 18000 D The option vests in four equal annual installments beginning on June 14, 2018. This amendment is being filed to correct a typographical error in the acquisition date of the option referenced above and related information including the option's exercise and expiration dates and the date of earliest transaction in the Form 4. /s/ Teresa Bair, Attorney-in-Fact 2018-04-27