X0306 4/A 2020-09-10 2020-09-14 0 0001300699 Athenex, Inc. ATNX 0001771886 Davis Stephanie A C/O ATHENEX, INC. 1001 MAIN STREET, SUITE 600 BUFFALO NY 14203 1 0 0 0 Common Stock 2020-09-10 4 P 0 10000 11.35 A 20000 D This transaction was executed in multiple trades ranging from $11.31 to $11.37. The price reported in Column 4 is a weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder full information regarding the number of shares and prices at which the transactions were effected. This transaction was previously reported by Ms. Davis. This amendment is being filed to provide the price range for the multiple trades used to calculate the weighted average price. /s/Teresa Bair, Attorney-in-Fact 2020-09-16