MCKESSON CORP — Director's Dealing 2015

May 27, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MCKESSON CORP (MCK)
CIK: 0000927653
Period of Report: 2015-05-24

Reporting Person: HAMMERGREN JOHN H (Director, Chairman, President & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-24	Common Stock	M	157590	—	Acquired	157590	Direct
2015-05-24	Common Stock	F	67528	$240.61	Disposed	90062	Direct
2015-05-26	Common Stock	S	30062	$238.9721	Disposed	60000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-24	Restricted Stock Units	$0	M	157590	Disposed		Common Stock (157590)	Direct
2015-05-26	Employee Stock Option (Right-to-buy)	$237.86	A	114283	Acquired	2022-05-26	Common Stock (114283)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	590256.925	Indirect
Common Stock	4108.523	Indirect

Footnotes

F1: This transaction represents a withholding of shares to cover taxes applicable to a vesting of RSUs also reported on this Form 4.

F2: Sale pursuant to a previously adopted plan, intended to comply with Rule 10b5-1(c).

F3: Represents 469,416.925 shares held under the Hammergren Family Trust; 8,887 shares held in the JHH 2010 GRAT #7; 12,879 held in the JHH 2010 GRAT #8; 12,879 shares in the JHH 2010 GRAT #9; 12,879 held in the JHH 2010 GRAT #10; 12,880 held in the JHH 2010 GRAT #11; 8,902 shares held in the WLH 2010 GRAT #7; 12,883 in the WLH 2010 GRAT #8; 12,884 in the WLH 2010 GRAT #9; 12,884 in the WLH 2010 GRAT #10; 12,883 in the WLH 2010 GRAT #11.

F4: These units vested 100% on 5/24/2015.

F5: This option granted 05/26/2015 will vest 25% annually, commencing on the first anniversary of the grant date.