X0306 4 2019-06-18 0 0001260990 Oncternal Therapeutics, Inc. ONCT 0001244823 BREITMEYER JAMES B C/O ONCTERNAL THERAPEUTICS, INC. 12230 EL CAMINO REAL, SUITE 300 SAN DIEGO CA 92130 1 1 0 0 President, CEO Stock Options 0.81 2019-06-18 4 A 0 42196 0.00 A 2028-11-14 Common Stock 42196 42196 D On November 14, 2018, the reporting person was granted an award of stock options that vest upon the achievement of certain pre-established strategic milestones. On June 18, 2019, the Compensation Committee of the Issuer's board of directors determined that one such strategic milestone had been achieved, resulting in the vesting of options to purchase 42,196 shares of the Issuer's common stock. /s/ Hazel M. Aker, Attorney-in-fact 2019-06-20