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 (MPLX) filed a current report describing exhibits related to its existing Registration Statement on Form S-3 (Registration No. 333-295600). The filing lists an Underwriting Agreement dated August 10, 2026 among MPLX LP, its general partner MPLX GP LLC, and several underwriters, including TD Securities (USA) LLC, Goldman Sachs & Co. LLC, J.P. Morgan Securities LLC, SMBC Nikko Securities America, Inc., and Wells Fargo Securities, LLC, acting as representatives of the underwriters. It also includes the Thirty-Eighth, Thirty-Ninth, and Fortieth Supplemental Indentures, each dated August 24, 2026, between MPLX LP and The Bank of New York Mellon Trust Company, N.A., as trustee, along with a legal opinion and related consent from Jones Day.
MPLX LP (symbol MPLX) reports that a director received an equity award of 1,232.166 Common Units (Limited Partner Interests) on August 14, 2026. The units were acquired as a grant or award at a stated price of $0.0000 per unit, reflecting non-cash compensation.
After this award, the director holds 69,313.2300 MPLX common units directly. In addition, 68,497.0000 units are held indirectly through a revocable trust identified as the Garry L. and Kathleen J. Peiffer Trust, created on April 24, 2026.
MPLX LP (MPLX) reported an insider equity award for director Walker Ray N Jr. He received a grant of 81.939 Common Units (Limited Partner Interests) on 2026-08-14 at a stated price of $0.0000 per unit, increasing his directly held units to 4,609.294 following the transaction. The award is characterized as a grant or other acquisition rather than an open-market purchase, and the Rule 10b5-1 plan checkbox was not selected.
MPLX LP (MPLX) reported that a director received a grant of common units representing limited partner interests. On 2026-08-14, the reporting person acquired 1,563.4270 common units in a grant or award transaction at a stated price of $0.0000 per unit, bringing the director’s directly held position to 95,447.7770 units.
MPLX LP (MPLX) reported that director J. Michael Stice received a grant of 982.715 Common Units (Limited Partner Interests) on 2026-08-14 at a stated price of $0.0000 per unit, described as a grant/award acquisition. Following this grant, he holds 58,412.913 units directly and 700 units indirectly through The Mike Stice Trust.
MPLX LP (symbol: MPLX) is the issuer of record for a Form 4 filing submitted to the SEC.
MPLX LP (symbol: MPLX) is the issuer of record for a Form 4 filing submitted to the SEC.
MPLX LP (MPLX) reported that a director received an additional equity award in the form of common units. Reporting person Christine S. Breves acquired 218.82 common units of limited partner interests at a stated price of $0.00 per unit, increasing her direct holdings to 15,038.282 units.
MPLX LP is issuing $2,250,000,000 of senior unsecured notes: $1.25 billion 4.700% notes due 2029, $500 million 5.000% notes due 2032, and $500 million 5.500% notes due 2036. Interest is paid semi-annually on May 1 and November 1, starting May 1, 2027.
The notes are senior unsecured obligations of MPLX LP, effectively junior to secured debt and structurally subordinated to all liabilities of its subsidiaries. MPLX expects net proceeds of approximately $2,210 million, to be used to repay $1,250 million 4.125% senior notes due March 2027, with the remainder for general partnership purposes including capital expenditures and working capital.
As of June 30, 2026, total consolidated debt was $26,005 million, which would be about $27,005 million on an as-adjusted basis after this offering and the planned use of proceeds. MPLX maintains a $2.5 billion unsecured revolving credit facility with a maximum Consolidated Total Debt to Consolidated EBITDA ratio of 5.0 to 1.0 under its covenant.
MPLX LP plans to issue three new series of unsecured, unsubordinated senior notes under its existing indenture. Each series will pay fixed interest semi-annually beginning in 2027, may be redeemed at MPLX’s option (including a Treasury-based make‑whole call before specified Par Call Dates), and will rank equally with MPLX’s other senior unsecured debt but be effectively junior to any secured debt and structurally subordinated to obligations of its subsidiaries.
MPLX reports consolidated debt of $26,005 million as of June 30, 2026 and intends to use the net proceeds to repay or redeem its $1,250 million 4.125% senior notes due March 2027, with any remaining proceeds for general partnership purposes such as capital expenditures and working capital. MPLX is a large-cap master limited partnership sponsored and controlled by Marathon Petroleum Corporation, which owned about 64% of MPLX’s outstanding common units as of June 30, 2026.
The new notes are not protected by a change‑of‑control put, are not guaranteed by subsidiaries, and have no sinking fund. The base indenture contains limited covenants on liens and sale‑leaseback transactions tied to assets designated as principal properties and includes standard events of default, merger restrictions, and defeasance provisions. The notes will be issued only in book‑entry form through DTC, with no application for listing on any securities exchange.