Flash FinanceUS
Market closed S&P 5007,549.94+2.35% Nasdaq25,253.14+2.74% Dow 3052,389.75+2.15% Russell 20002,840.81+3.15% Nasdaq-10027,907.62+3.40% MidCap 4003,715.23+3.13% SmallCap 6001,722.37+2.89% VIX19.92-22.31% 10Y Yield4.86+0.10% Close of Nov 09, 2026
AI brief of an SEC Form 8-K · McKesson (MCK)

McKesson discloses cybersecurity incident found August 25, 2026; impact not yet determined

Negative Impact 3 of 5 other Written later

McKesson disclosed that it discovered a cybersecurity incident affecting its information systems on August 25, 2026, and that its investigation is in early stages. The company said it has not determined the incident is material or that it has had, or is reasonably likely to have, a material impact on its financial condition or results of operations.

Key points

  • Incident discovered August 25, 2026; investigation described as in early stages
  • McKesson has not determined the incident is material as of the filing date
  • Updates are posted at www.mckesson.com/cybersecurity
  • Filing dated August 28, 2026, signed by Chief Legal Officer Michele Lau

The filing

CompanyMcKesson (MCK)
Form8-K, current report
Filed with the SECAug 28, 2026, 4:05 PM ET
Accession number0000927653-26-000247

Items reported: 7.01 Regulation FD Disclosure

Read the filing on SEC.gov ↗

Written by AI on Nov 8, 2026, 2:16 AM ET, from this filing only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on August 28, 2026.

Briefs are written by AI from the filing text and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the AI's reading of the filing for shareholders, not a price forecast. Not investment advice.