Flash FinanceUS
Market closed · weekend S&P 5007,376.86+0.31% Nasdaq24,579.42+1.09% Dow 3051,285.73-0.46% Russell 20002,754.11+0.89% Nasdaq-10026,989.99+1.35% MidCap 4003,602.50+0.56% SmallCap 6001,673.98+0.05% VIX25.64-9.01% 10Y Yield4.86+0.45% Close of Nov 06, 2026
AI brief of an SEC Form 8-K · Marathon Petroleum (MPC)

Marathon Petroleum names CEO Maryann Mannen as chairman effective January 1, 2026

Neutral Impact 4 of 5 leadership Written later

Marathon Petroleum said its board elected Chief Executive Officer Maryann T. Mannen as chairman, effective January 1, 2026, succeeding Michael J. Hennigan, who is retiring as executive chairman and director. Mannen will hold the chairman role alongside her CEO duties, and the board will shrink to 11 directors on that date.

Key points

  • Maryann T. Mannen, current president and CEO, becomes chairman effective January 1, 2026.
  • Michael J. Hennigan retires as executive chairman and board member effective January 1, 2026.
  • John Surma continues as independent lead director.
  • The board's size will decrease to 11 directors as of the effective date; the mandatory retirement policy has been rescinded.

The filing

CompanyMarathon Petroleum (MPC)
Form8-K, current report
Filed with the SECNov 4, 2025, 4:08 PM ET
Accession number0001510295-25-000065

Items reported: 5.02 Director / Officer Change8.01 Other Events

Read the filing on SEC.gov ↗

Written by AI (Anthropic Claude, claude-haiku-5-5) on Nov 8, 2026, 1:21 AM ET, from the text of the filing and its press-release exhibits 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 November 04, 2025.

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