X0306 4 2020-07-29 0000927653 MCKESSON CORP MCK 0001225916 MUELLER EDWARD A 6555 STATE HWY 161 IRVING TX 75039 1 0 0 0 Restricted Stock Units (RSUs) 0 2020-07-29 4 A 0 1157 0 A Common Stock 1157 1157 D Restricted Stock Units (RSUs) 0 2020-07-29 4 A 0 771 0 A Common Stock 771 771 D RSUs granted pursuant to an automatic annual grant under the 2013 Stock Plan. This grant vests immediately, however, receipt of the underlying shares is deferred unitl the Director leaves the Board. RSU granted to Director pursuant to an automatic annual grant under the 2013 Stock Plan for the Chairman of the Board. This grant vested immediately, however, receipt of the underlying shares is deferred until the Director leaves the Board. Laura Heiman, Attorney-in-fact 2020-07-31