X0306 4 2019-09-19 0 0001654151 Deciphera Pharmaceuticals, Inc. DCPH 0001752827 Martin Daniel C. C/O DECIPHERA PHARMACEUTICALS, INC. 500 TOTTEN POND ROAD WALTHAM MA 02451 0 1 0 0 Chief Commercial Officer Common Stock 2019-09-19 4 S 0 3000 35.5627 D 17000 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. Represents shares sold in connection with the payment of taxes due. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $35.205 to $36.07 inclusive. The reporting person undertakes to provide to Deciphera Pharmaceuticals, Inc., any security holder of Deciphera Pharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/ Jeffrey M. Held, Attorney-in-Fact 2019-09-23