MCK: Company disclosure

Item 7.01 Regulation FD Disclosure. On August 25, 2026, McKesson Corporation discovered a cybersecurity incident affecting its information systems. An investigation of the incident is in its early stages. Information about the incident, including any updates, is available on the company’s website at www.mckesson.com/cybersecurity. As of the date of this filing, the company has not determined that the incident is material or that the incident has had, or is reasonably likely to have, any material impact on the company, including its financial condition or results of operations. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit No. Description 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: August 28, 2026 McKesson Corporation By: /s/ Michele Lau Michele Lau Executive Vice President and Chief Legal Officer