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 Senior VP of Logistics & Storage Shawn M. Lyon reported equity compensation and related tax transactions in common units. On March 1, 2026, he acquired 5,986 common units as a grant at $0.00 per unit. On March 2, 2026, he had three F-code tax-withholding dispositions of 920, 1,033, and 798 common units at $59.22 per unit to satisfy tax obligations by delivering units. After these transactions, he directly held 28,289 common units of MPLX LP.
MPLX LP director Maria A. Khoury reported an award of 8,451 Common Units (Limited Partner Interests). The units were acquired as a grant or award at a stated price of $0.00 per unit, bringing her directly held total to 8,451 units.
MPLX LP executive vice president and chief financial officer Carl Kristopher Hagedorn reported both an equity award and related tax-withholding transactions in common units. On March 1, 2026, he acquired 4,930 common units as a grant at $0.00 per unit. On March 2, 2026, he disposed of 422, 916, and 663 common units at $59.22 per unit in tax-withholding dispositions. Following these transactions, his direct holdings were reported at 20,409 common units.
MPLX LP executive vice president and COO Gregory Scott Floerke received a grant of 5,986 common units of limited partner interests on March 1, 2026 at a stated price of $59.22 per unit. On March 2, 2026, three tax-withholding dispositions totaling 995, 1,100 and 797 units reduced his directly owned units to 95,337.
MPLX LP insider Molly R. Benson, Chief Legal Officer and Corporate Secretary, reported equity compensation activity in common units. On March 1, she acquired 8,803 units as a grant at $0.0000 per unit. On March 2, she disposed of 614, 1,240, and 998 units at $59.22 per unit through tax-withholding dispositions to cover tax liabilities, leaving 46,114 units held directly.
MPLX LP is a large master limited partnership that owns midstream energy infrastructure across the U.S., including crude oil and refined product pipelines, marine assets, terminals, storage caverns, and extensive natural gas and NGL gathering, processing and fractionation capacity.
The business is organized into two segments: Crude Oil and Products Logistics and Natural Gas and NGL Services. As of December 31, 2025, Marathon Petroleum Corporation (“MPC”) owned about 64 percent of MPLX’s common units and provided 48 percent of total 2025 revenues and other income, making MPC its key customer and sponsor.
MPLX emphasizes long-term, fee-based contracts with minimum volume commitments, cost discipline, and returning capital to unitholders. Recent actions include declaring a $1.0765 per-unit distribution and issuing $1.0 billion of 5.30 percent senior notes due 2036 and $500 million of 6.10 percent senior notes due 2056.
MPLX LP director Ray N. Walker Jr. reported an equity award of 32.127 common units of limited partner interests on February 17, 2026. The units were granted at a price of $0.00 per unit as a grant/award acquisition, not an open-market purchase. After this award, his directly held stake increased to 1,743.699 common units.
MPLX LP director John P. Surma received an award of 1,505.132 common units on February 17, 2026. The units, representing limited partner interests, were acquired as a grant at a stated price of $0.0000 per unit. After this award, his directly held units total 89,190.259.
MPLX LP director J. Michael Stice received an equity grant of common units. He was awarded 981.957 common units (limited partner interests) of MPLX LP on February 17, 2026, recorded as a grant or other acquisition with no cash price shown per unit.
After this grant, Stice directly holds 53,295.154 common units. In addition, 700 common units are held indirectly through The Mike Stice Trust, reflecting a separate indirect ownership position rather than a new transaction.
MPLX LP director Frank M. Semple reported an equity award of common units. On February 17, 2026, he acquired 1,071.818 common units of MPLX LP as a grant, bringing his directly held units to 58,172.334. Additional common units are reported as indirectly held through several trusts and an LLC.