MCKESSON CORP

MCKESSON CORP notified SEC Form 8-K on Aug 28, 2026 of a data breach, which occurred on Aug 25, 2026. Data exposed: Financial / bank account.

Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization: MCKESSON CORP
Source: SEC Form 8-K · source record
Date reported: Aug 28, 2026
Date(s) of breach: August 25, 2026
Residents affected: Not published by this source
Data exposed: Financial / bank account
Notice letter: Form 8-K filing
Discovered: Aug 25, 2026, as stated in the letter
"On August 25, 2026, McKesson Corporation discovered a cybersecurity incident affecting its information systems."
Days to notice: 3 days from discovery (Aug 25, 2026) to the Federal (SEC) record (Aug 28, 2026).
First seen by BreachTally: 2026-11-12 23:17 UTC
Ticker: MCK

Dates and counts as filed by the organization with the agency. The breach window and the report date often differ by months.

Item 7.01 excerpt

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.

Data reproduced from a public government filing. Spot an error? Email support@breachtally.com with the record link. Corrections are applied and noted.