{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-050596","form_type":"8-K","ticker":"MPLX","cik":"0001552000","company_name":"MPLX LP","filed_at":"2025-03-10T23:59:59+00:00","discovered_at":"2026-05-14T18:03:03.973504+00:00","generated_at":"2026-05-25T01:23:15.478587+00:00","sec_items":["8.01","9.01"],"event_type":"debt","sentiment":"neutral","materiality_score":0.3,"calibrated_materiality_score":0.3,"confidence":"low","headline":"MPLX files underwriting agreement and supplemental indentures for new debt offering","bullets":["Underwriting agreement dated March 3, 2025 with BofA Securities, Barclays, and J.P. Morgan as representatives.","Thirtieth and Thirty-First Supplemental Indentures dated March 10, 2025 with The Bank of New York Mellon as Trustee.","Documents filed under existing shelf registration statement S-3 (No. 333-271922); no principal, rate, or maturity disclosed in filing text."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-050596","json":"https://secwatch.observer/filing/0001193125-25-050596.json","markdown":"https://secwatch.observer/filing/0001193125-25-050596.md","text":"https://secwatch.observer/filing/0001193125-25-050596.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1552000/000119312525050596/0001193125-25-050596-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1552000/000119312525050596/d938554d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-25T01:23:15.478587+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":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}