MCK: Company disclosure

Item 7.01 Regulation FD Disclosure On October 6, 2026, McKesson Corporation (“Company”), Clayton, Dubilier & Rice, LLC (“CD&R”) and Option Care Health, Inc. issued a joint news release regarding a proposed acquisition of Option Care Health, Inc. A copy of that news release is posted on the Company’s website (https://www.mckesson.com/About-McKesson/Newsroom/Press-Releases/ and https://investor.mckesson.com/news/default.aspx) and attached hereto as Exhibit 99.1. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit No. Description 99.1 Joint n ews release dated October 6, 2026 104 Cover Page Interactive Data File - the cover page iXBRL tags are embedded within the Inline XBRL document SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: October 6, 2026 McKesson Corporation By: /s/ Kenny K. Cheung Kenny K. Cheung Executive Vice President and Chief Financial Officer