Welcome to our dedicated page for MPLX LP SEC filings (Ticker: MPLX), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
MPLX LP filings document the disclosure record of a Delaware master limited partnership with common units representing limited partnership interests listed on the New York Stock Exchange. Its reports include 8-K disclosures for operating results and financial condition, exhibits containing earnings releases, and annual reporting on the partnership's midstream energy infrastructure and logistics business.
The filing record also covers capital-structure and financing matters, including revolving credit agreements, underwriting agreements, supplemental indentures, and debt-securities exhibits filed under registration statements. Governance disclosures address MPLX GP LLC as general partner, board and officer changes, compensatory arrangements, shareholder voting matters, material-event reporting, and risk disclosure tied to the partnership's operations and securities.
MPLX LP announced a leadership transition. The board elected Maryann T. Mannen, currently President and Chief Executive Officer and a director of MPLX GP LLC, as Chairman of the Board effective January 1, 2026. She will add the Chairman role to her existing responsibilities.
Michael J. Hennigan notified the Partnership of his retirement as Executive Chairman and as a director of MPLX GP, also effective January 1, 2026. With his retirement, the board size will be reduced to 10 directors as of the effective date. The Partnership issued a press release on November 4, 2025, detailing these changes.
MPLX LP reported stronger Q3 results and executed several portfolio moves. For the quarter ended September 30, 2025, total revenues and other income were $3,619 million, up from $2,972 million a year ago, and net income was $1,555 million versus $1,047 million. Limited partners’ net income was $1,545 million, or $1.52 per common unit (basic and diluted). For the nine months, revenues were $9,746 million and net income was $3,749 million.
MPLX acquired Northwind Midstream for $2.4 billion in cash, financed with $4.5 billion senior notes issued in August 2025. It also bought the remaining 55% of BANGL for $703 million cash plus an earnout of up to $275 million, recognizing a $484 million gain on remeasurement. The company agreed to divest its Rockies operations for $1.0 billion, with an estimated gain in excess of $150 million upon closing.
Cash from operations reached $4,413 million year‑to‑date; cash was $1,765 million and total debt was $26,007 million at quarter‑end. MPLX repurchased $300 million of units year‑to‑date and had $1.2 billion remaining under authorizations. A Q3 cash distribution of $1.0765 per unit ($1,095 million total) was declared, payable on November 14, 2025.
MPLX LP reported that it furnished a press release announcing financial results for the quarter ended September 30, 2025. The release is attached as Exhibit 99.1 and incorporated by reference.
The information was provided under Item 2.02 and, along with Exhibit 99.1, is designated as “furnished” and not deemed “filed” under the Exchange Act. MPLX’s common units trade on the NYSE under the symbol MPLX.
Insider acquisition recorded: On 08/25/2025 Ray N. Walker Jr., a director of MPLX GP LLC (the general partner of MPLX LP), was reported acquiring 1,677.632 common units of MPLX at a stated price of $0. Following the transaction, he beneficially owns 1,677.632 units. The filing is signed by an attorney-in-fact on behalf of Mr. Walker.
MPLX LP director files initial ownership report showing no units held. Ray N. Walker Jr., a director of MPLX GP LLC, the general partner that manages MPLX LP, filed an initial insider ownership statement as of August 25, 2025. The filing reports beneficial ownership of 0 common units of MPLX LP, held directly. This is a routine regulatory disclosure of insider holdings and does not describe any purchase or sale transaction.
MPLX LP reported that, on August 25, 2025, the board of managers of MPC Investment LLC, the sole member of MPLX GP LLC, increased the size of the board of directors of the general partner to eleven members and elected Ray N. Walker, Jr. as a director, effective the same day. He is expected to serve on the audit committee and the conflicts committee, which oversee financial reporting and related-party or conflict‑sensitive matters.
As a non‑management director, Mr. Walker will receive compensation in the same manner as the partnership’s other non‑management directors, under terms previously described in MPLX LP’s Annual Report on Form 10‑K for the year ended December 31, 2024.
John P. Surma, reported as a director of MPLX GP LLC (the general partner of MPLX LP), executed a transaction on 08/15/2025 acquiring 1,475.301 common units (limited partner interests). The form reports a price of $0 for the transaction and shows 86,095.058 common units beneficially owned following the reported transaction. The filing was signed by an attorney-in-fact, Molly R. Benson, on 08/19/2025.
Director J. Michael Stice reported an acquisition of MPLX common units. On 08/15/2025 he acquired 962.494 common units at a reported price of $0, increasing his total beneficial ownership to 51,275.827 common units. The filing shows 700 units held indirectly by The Mike Stice Trust. The reporting person is a director of MPLX GP LLC, the issuer's general partner.
Frank M. Semple, a director of MPLX GP LLC, reported a transaction in MPLX common units on 08/15/2025. The filing shows an acquisition of 1,050.574 common units at a reported price of $0, and indicates 55,968.214 common units beneficially owned following the transaction as direct holdings. Additional indirect holdings are reported: 333,337 units through Frank M Semple Revocable Trust, 111,180 through Robin Y Semple 2012 Dynasty Trust, and 48,777 through EK Holdings LLC. The form is signed by an attorney-in-fact on behalf of Mr. Semple.
Garry L. Peiffer, a director of MPLX GP LLC (the general partner of MPLX LP), reported an acquisition of 1,157.128 common units of MPLX on 08/15/2025. The reported transaction lists a price of $0. After the transaction, the filing shows 61,644.675 common units beneficially owned directly and 68,497 beneficially owned indirectly by the Garry L. Peiffer Revocable Trust. The Form 4 was signed by an attorney-in-fact on 08/19/2025.