secwatch.observer — SEC 8-K summary
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Issuer:     Marathon Petroleum Corp (MPC)
CIK:        0001510295
Form:       8-K
Filed at:   2025-11-04T23:59:59+00:00
Accession:  0001510295-25-000065
Event type: leadership
Sentiment:  neutral
Materiality: 0.55
Item codes: 5.02, 8.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

MPC CEO Maryann Mannen elected Chairman; Michael Hennigan retires as Executive Chairman
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- Maryann T. Mannen (president and CEO) elected Chairman of the Board effective Jan 1, 2026, retaining CEO role.
- Michael J. Hennigan retires as Executive Chairman and from the Board, effective Jan 1, 2026.
- John Surma continues as independent lead director; Board size reduces to 11 directors.
- Hennigan served as CEO from March 2020 to August 2024, then Executive Chairman.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1510295/000151029525000065/0001510295-25-000065-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1510295/000151029525000065/mpc-20251029.htm
  HTML page:      https://secwatch.observer/filing/0001510295-25-000065

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer