{"schema_version":"secwatch.filing_event.v1","accession":"0001552000-24-000017","form_type":"8-K","ticker":"MPLX","cik":"0001552000","company_name":"MPLX LP","filed_at":"2024-05-13T23:59:59+00:00","discovered_at":"2026-05-14T18:03:18.929465+00:00","generated_at":"2026-06-02T02:18:37.770878+00:00","sec_items":["5.02","8.01","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"MPLX announces CEO succession: Maryann Mannen to become President and CEO effective Aug 1, 2024","bullets":["Maryann T. Mannen succeeds Michael J. Hennigan as President and CEO of the general partner, effective August 1, 2024.","Hennigan becomes Executive Chairman of the board; Christopher A. Helms remains independent Lead Director.","Mannen will also serve as President and CEO of parent Marathon Petroleum (MPC) as of the same date.","Under Hennigan's CEO tenure, MPLX returned approx. $15B to unitholders via distributions and buybacks."],"urls":{"canonical":"https://secwatch.observer/filing/0001552000-24-000017","json":"https://secwatch.observer/filing/0001552000-24-000017.json","markdown":"https://secwatch.observer/filing/0001552000-24-000017.md","text":"https://secwatch.observer/filing/0001552000-24-000017.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1552000/000155200024000017/0001552000-24-000017-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1552000/000155200024000017/mplx-20240511.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-02T02:18:37.770878+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"086b2e6330","claim":"Maryann T. Mannen was appointed as President and Chief Executive Officer at MPLX LP.","evidence_excerpt":"appointed Maryann T. Mannen as President and Chief Executive Officer, effective August 1, 2024.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1552000/000155200024000017/0001552000-24-000017-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"President and Chief Executive Officer"}],"fact_type":"executive_change"},{"claim_id":"368fa0b7e9","claim":"Michael J. Hennigan was elected as Executive Chairman at MPLX LP.","evidence_excerpt":"Mr. Hennigan has been elected Executive Chairman of MPLX GP’s board of directors","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1552000/000155200024000017/0001552000-24-000017-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"elected"},{"label":"Role","value":"Executive Chairman"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}