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 reported an insider transaction by Senior Vice President, Logistics and Storage, Shawn M. Lyon. On 12/12/2025, he disposed of 245 common units (limited partner interests) at $54.85 per unit. Following this transaction, he beneficially owned 25,054 common units directly. MPLX LP is managed by the directors and executive officers of MPLX GP LLC, where Lyon serves as Senior Vice President, Logistics and Storage.
MPLX LP reported an insider disposition of common units by Executive Chairman and director Michael J. Hennigan. On December 12, 2025, he disposed of 1,335 MPLX common units (limited partner interests) at $54.85 per unit in a transaction coded “F.”
Following this transaction, he directly beneficially owned 359,137 MPLX common units. He serves as Executive Chairman of the Board of Directors of MPLX GP LLC, the general partner that manages MPLX LP through its directors and executive officers.
An executive of MPLX LP reported an insider transaction involving the partnership’s common units. On 12/12/2025, the reporting person disposed of 242 common units (limited partner interests) at a price of $54.85 per unit. After this transaction, the executive beneficially owns 92,243 common units directly.
MPLX LP reporting person Molly R. Benson disclosed a transaction involving 306 common units (limited partner interests) on 12/12/2025 at a price of $54.85 per unit. After this disposition, she beneficially owns 40,163 common units directly. Benson is the Chief Legal Officer and Corporate Secretary of MPLX GP LLC, the general partner whose directors and executive officers manage MPLX LP.
MPLX LP reported that director Ray N. Walker Jr. acquired additional equity in the partnership. On 11/14/2025, he acquired 1,711.572 common units (limited partner interests) at a reported price of $0 per unit, as shown in Table I of the Form 4. Following this transaction, he beneficially owns 1,711.572 common units in a direct capacity. The filing notes that he is a director of MPLX GP LLC, the general partner that manages the issuer.
MPLX LP reported an insider transaction on a Form 4 involving one director. On 11/14/2025, the reporting person acquired 1,590.069 Common Units (Limited Partner Interests) in MPLX. The units were reported at a price of $0, indicating they were not purchased for cash in the open market. Following this transaction, the director beneficially owns 87,685.127 MPLX common units, held directly. The filer is a director of MPLX GP LLC, the general partner that manages the issuer.
MPLX LP (MPLX) reported an insider equity transaction by a director on Form 4. On 11/14/2025, the reporting person acquired 1,037.37 MPLX common units (limited partner interests) in a transaction reported with a price of $0 per unit, indicating a grant or similar award rather than an open-market purchase. Following this transaction, the reporting person beneficially owns 52,313.197 MPLX common units directly and 700 MPLX common units indirectly through The Mike Stice Trust. The reporting person serves as a director of MPLX GP LLC, the general partner that manages MPLX LP.
MPLX LP (MPLX) director Frank M. Semple reported acquiring 1,132.302 common units on 11/14/2025, according to a Form 4 insider filing. The units were acquired at a reported price of $0, indicating an award or similar non-cash grant rather than an open-market purchase. Following this transaction, Semple directly holds 57,100.516 MPLX common units. He also reports additional indirect holdings of 333,337 units through the Frank M Semple Revocable Trust, 111,180 units through the Robin Y Semple 2012 Dynasty Trust, and 48,777 units through EK Holdings LLC. Semple serves as a director of MPLX GP LLC, the general partner that manages MPLX LP.
MPLX LP director Garry L. Peiffer reported acquiring additional common units of the master limited partnership. On 11/14/2025, he acquired 1,247.144 MPLX common units (limited partner interests) at a reported price of $0, suggesting these were likely granted rather than purchased in the open market. Following this transaction, he beneficially owns 62,891.819 common units in a direct capacity and an additional 68,497 common units indirectly through the Garry L. Peiffer Revocable Trust. The filing confirms this is an individual Form 4 for one reporting person in his capacity as a director of MPLX GP LLC, the general partner that manages MPLX LP.
MPLX LP reported an insider transaction on Form 4 involving director Christopher A. Helms. On 11/14/2025, Helms acquired 1,357.679 MPLX common units (limited partner interests) at a reported price of $0 per unit, increasing his direct holdings. Following this transaction, he beneficially owned 79,465.942 common units directly. MPLX is managed by the directors and executive officers of MPLX GP LLC, where Helms serves as a director.