---
schema_version: "secwatch.filing_event.v1"
accession: "0001510295-24-000052"
form_type: "8-K"
ticker: "MPC"
cik: "0001510295"
company_name: "Marathon Petroleum Corp"
filed_at: "2024-05-13T23:59:59+00:00"
generated_at: "2026-06-02T02:14:49.487268+00:00"
event_type: "leadership"
sentiment: "positive"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Marathon Petroleum appoints Maryann Mannen as CEO, effective Aug 1, 2024

## Summary
- Maryann Mannen, current President, becomes CEO and joins the Board on August 1, 2024, succeeding Michael Hennigan.
- Michael Hennigan transitions from CEO to Executive Chairman; Board waives mandatory retirement policy for him.
- John Surma elected Lead Director; Board expands to 14 members with Mannen's election to the Board.
- Mannen's 2024 target LTI award is $5,000,000 with base salary $1,050,000; Hennigan's target LTI was $14,800,000.

## SEC filing metadata
- accession: 0001510295-24-000052
- form_type: 8-K
- ticker: MPC
- cik: 0001510295
- company_name: Marathon Petroleum Corp
- filed_at: 2024-05-13T23:59:59+00:00
- event_type: leadership
- sentiment: positive
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1510295/000151029524000052/0001510295-24-000052-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1510295/000151029524000052/mpc-20240511.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001510295-24-000052
- JSON: https://secwatch.observer/filing/0001510295-24-000052.json
- Plain text: https://secwatch.observer/filing/0001510295-24-000052.txt

## Key facts
- Executive change
  John P. Surma was elected as Lead Director at Marathon Petroleum Corp.
  - Action: elected
  - Role: Lead Director
  source text: current Chairman of the Board John P. Surma has been elected Lead Director.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1510295/000151029524000052/0001510295-24-000052-index.htm
- Executive change
  Maryann T. Mannen was appointed as President and Chief Executive Officer of MPLX at Marathon Petroleum Corp.
  - Action: appointed
  - Role: President and Chief Executive Officer of MPLX
  source text: effective August 1, 2024, has been appointed as the President and Chief Executive Officer of MPLX.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1510295/000151029524000052/0001510295-24-000052-index.htm
- Executive change
  Maryann T. Mannen was elected as Director at Marathon Petroleum Corp.
  - Action: elected
  - Role: Director
  source text: the Board increased the size of the Board to fourteen members and elected Ms. Mannen as a director of the Company, with such increase and election effective August 1, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1510295/000151029524000052/0001510295-24-000052-index.htm
- Executive change
  Maryann T. Mannen was appointed as Chief Executive Officer at Marathon Petroleum Corp.
  - Action: appointed
  - Role: Chief Executive Officer
  source text: On May 11, 2024, the board of directors (the “Board”) of Marathon Petroleum Corporation (the “Company”) appointed Maryann T. Mannen as Chief Executive Officer of the Company, effective August 1, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1510295/000151029524000052/0001510295-24-000052-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.