X0303 4 2009-07-22 0000927653 MCKESSON CORP MCK 0001197913 KNOWLES MARIE L/CA ONE POST STREET SAN FRANCISCO, CA 94104 1 0 0 0 Common Stock 2009-07-22 4 A 0 3285 0 A 3285 D Restricted Stock Units granted pursuant to an automatic annual grant under the 2005 Stock Plan. This grant vested immediately and the reporting person elected to receive the underlying shares upon grant. Donna Spinola, Attorney-in-fact 2009-07-22