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: REES NIGEL A (SVP & Controller)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-24	Common Stock	M	2616	—	Acquired	2616	Direct
2015-05-24	Common Stock	F	1313	$240.61	Disposed	1303	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-24	Restricted Stock Units	$0	M	2616	Disposed		Common Stock (2616)	Direct
2015-05-26	Employee Stock Option (Right-to-buy)	$237.86	A	2825	Acquired	2022-05-26	Common Stock (2825)	Direct
2015-05-26	Restricted Stock Units	$0	A	1152	Acquired		Common Stock (1152)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	10146	Indirect
Common Stock	1554.0605	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: These units vested 100% on 5/24/2015.

F3: This option granted 05/26/2015 will vest 25% annually, commencing on the first anniversary of the grant date.

F4: These units will vest 100% on 5/26/2018.