Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Tyler Brian Scott
 2. Date of Event Requiring Statement (Month/Day/Year)
08/02/2018		 3. Issuer Name and Ticker or Trading Symbol
MCKESSON CORP [MCK]
(Last)
(First)
(Middle)
ONE POST STREET		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President & COO
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

SAN FRANCISCO, CA 94104		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 12,192
D
 
Common Stock 205.8778
I
By McKesson Corporation 401(k) Retirement Savings Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right-to-buy)   (1) 10/31/2019 Common Stock 6,000 $ 93.31 D  
Employee Stock Option (right-to-buy)   (2) 05/21/2020 Common Stock 16,250 $ 118.41 D  
Employee Stock Option (right-to-put)   (3) 05/27/2021 Common Stock 22,042 $ 183.37 D  
Employee Stock Option (right-to-buy)   (4) 08/05/2021 Common Stock 1,467 $ 191.81 D  
Employee Stock Option (right-to-buy)   (5) 05/26/2022 Common Stock 21,752 $ 237.86 D  
Employee Stock Option (right-to-buy)   (6) 05/24/2023 Common Stock 37,083 $ 182.77 D  
Employee Stock Option (right-to-buy)   (7) 05/23/2024 Common Stock 34,713 $ 159 D  
Employee Stock Option (right-to-buy)   (8) 05/30/2025 Common Stock 25,296 $ 144.43 D  
Restricted Stock Units (RSUs)   (9)   (9) Common Stock 8,152 $ 0 D  
Restricted Stock Units (RSUs)   (10)   (10) Common Stock 20,772 $ 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Tyler Brian Scott
ONE POST STREET
SAN FRANCISCO, CA 94104		       President & COO  

Signatures

Donna Spinola, Attorney-in-fact 08/03/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) This option vests 25% on 10/31/2013, 25% on 10/31/2014, 25% on 10/31/2015 and 25% on 10/31/2016.
(2) This option vests 25% on 5/21/2014, 25% on 5/21/2015, 25% on 5/21/2016, and 25% on 5/21/2017.
(3) This option vests 25% on 5/27/2015, 25% on 5/27/2016, 25% on 5/27/2017 and 25% on 5/27/2018.
(4) This option vests 25% on 8/5/2015, 25% on 8/5/2016, 25% on 8/5/2017 and 25% on 8/5/2018.
(5) This option vests 25% on 5/26/2016, 25% on 5/26/2017, 25% on 5/26/2018 and 25% on 5/26/2019.
(6) This option vests 25% on 5/24/2017, 25% on 5/24/2018, 25% on 5/24/2019 and 25% on 5/24/2020.
(7) This option vests 25% on 5/23/2018, 25% on 5/23/2019, 25% on 5/23/2020 and 25% on 5/23/2021.
(8) This option vests 25% on 5/30/2019, 25% on 5/30/2020, 25% on 5/30/2021 and 25% 5/30/2022.
(9) These RSUs vest 100% on 5/30/2021.
(10) These RSUs vest 33% on 5/30/2019, 33% on 5/30/2020 and 33% on 5/30/2021.

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