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STICE J MICHAEL reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director J. Michael Stice received an equity grant of 2,579.543 Common Units (Limited Partner Interests) on an award valued at $0.0000 per unit. This represents his annual 2026 equity retainer award. Following the grant, he directly holds 55,874.697 common units and indirectly holds 700 common units through The Mike Stice Trust.
SEMPLE FRANK M reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Frank M. Semple reported an equity award and updated holdings in common units. He received 2,579.543 common units as his annual 2026 equity retainer award at a stated price of $0.00 per unit, increasing his direct holdings to 60,751.877 units. The filing also lists indirect ownership of MPLX common units through EK Holdings LLC, the Robin Y Semple 2012 Dynasty Trust, and the Frank M Semple Revocable Trust.
Peiffer Garry L. reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Garry L. Peiffer received an equity compensation award of 2,246.989 common units of MPLX LP on April 30, 2026. The award was granted at $0.00 per unit as his annual 2026 equity retainer, so it was not an open-market purchase.
After this grant, Peiffer directly holds 66,319.332 common units. Separately, 68,497 common units are reported as indirectly held through the Garry L. Peiffer Revocable Trust.
HELMS CHRISTOPHER A reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Christopher A. Helms received an equity grant of 2,246.989 common units as part of his annual 2026 equity retainer award. The grant was reported at a price of $0.00 per unit, reflecting a compensation award rather than a market purchase. Following this award, Helms directly holds a total of 82,998.086 MPLX common units.
Breves Christine S reported acquisition or exercise transactions in this Form 4 filing.
MPLX LP director Christine S. Breves received an equity grant of 2,246.989 common units (limited partner interests) as her annual 2026 equity retainer award. The grant was reported at a price of $0.00 per unit, indicating it is compensation rather than an open-market purchase. Following this award, she directly holds a total of 14,084.446 MPLX common units.
MPLX LP entered into a new $2.5 billion unsecured revolving credit agreement maturing on April 7, 2031, intended for general partnership purposes. This New MPLX Credit Agreement replaces the prior $2.0 billion 2022 credit facility, which was terminated with no borrowings outstanding.
The facility has a $2.5 billion commitment with the option to increase commitments by up to an additional $1.0 billion, subject to lender consent. It includes sub-facilities for $150 million of swing-line loans and up to $150 million of letters of credit, which may be increased to $200 million.
Borrowings accrue interest at either Adjusted Term SOFR plus 100–175 basis points or an Alternate Base Rate plus 0–75 basis points, depending on MPLX’s credit ratings. MPLX must keep its ratio of Consolidated Total Debt to Consolidated EBITDA at or below 5.0x, or 5.5x during an Acquisition Period. As of March 31, 2026, MPLX reported $1.5 billion of cash and cash equivalents and no borrowings under the new facility.
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 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 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.