Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
Form 144

144: Issuer Information

Name of Issuer	MCKESSON CORP
SEC File Number	001-13252
Address of Issuer	6555 STATE HIGHWAY 161 IRVING TEXAS 75039
Phone	972-446-4800
Name of Person for Whose Account the Securities are To Be Sold	TYLER BRIAN S.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer Director

144: Securities Information

Record	Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
#1	Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RHODE ISLAND 02917	3,471	$1,457,820.00	135,602,262	06/29/2023	NYSE

144: Securities To Be Sold

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

Record	Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
#1	Common	06/29/2023	Option Granted - 05/23/2017	Issuer	☐	—	3,471	06/29/2023	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

144: Securities Sold During The Past 3 Months

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

Record	Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
#1	Brian Tyler 6555 State Hwy 161 Irving TEXAS 75039	Common	05/10/2023	18,542	$7,157,953.68
#2	Brian Tyler 6555 State Hwy 161 Irving TEXAS 75039	Common	05/16/2023	11,125	$4,351,543.75
#3	Brian Tyler 6555 State Hwy 161 Irving TEXAS 75039	Common	06/05/2023	3,938	$1,540,742.50
#4	Brian Tyler 6555 State Hwy 161 Irving TEXAS 750309	Common	06/13/2023	3,471	$1,388,400.00

144: Remarks and Signature

Remarks
Date of Notice	06/29/2023
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/02/2022
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Brian S. Tyler
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)