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: Blake Patrick (EVP, Group President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-24	Common Stock	M	29070	—	Acquired	31082.731	Direct
2015-05-24	Common Stock	F	14439	$240.61	Disposed	16643.731	Direct
2015-05-26	Common Stock	S	4878	$238.9721	Disposed	11765.731	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-24	Restricted Stock Units	$0	M	29070	Disposed		Common Stock (29070)	Direct
2015-05-26	Employee Stock Option (Right-to-buy)	$237.86	A	21063	Acquired	2022-05-26	Common Stock (21063)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	305.7542	Indirect

Footnotes

F1: Includes 2,012.731 shares purchased under the ESPP.

F2: This transaction represents a withholding of shares to cover taxes applicable to a vesting of RSUs also reported on this Form 4.

F3: Sale pursuant to a previously adopted plan, intended to comply with Rule 10b5-1(c).

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.