secwatch.observer — SEC 8-K summary
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Issuer:     MPLX LP (MPLX)
CIK:        0001552000
Form:       8-K
Filed at:   2025-11-04T23:59:59+00:00
Accession:  0001552000-25-000040
Event type: leadership
Sentiment:  neutral
Materiality: 0.75
Item codes: 5.02, 8.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

MPLX elects Maryann T. Mannen as Chairman; Michael J. Hennigan to retire as Executive Chairman effective Jan 1, 2026
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- Maryann T. Mannen elected Chairman of MPLX GP board effective Jan 1, 2026, in addition to her CEO role.
- Michael J. Hennigan to retire as Executive Chairman and board member effective Jan 1, 2026, reducing board size to 10.
- Chris Helms continues as independent lead director.
- Hennigan also retiring as executive chairman of MPC (Marathon Petroleum); Mannen to succeed as chairman of MPC effective Jan 1, 2026.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1552000/000155200025000040/0001552000-25-000040-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1552000/000155200025000040/mplx-20251029.htm
  HTML page:      https://secwatch.observer/filing/0001552000-25-000040

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