Every 8-K that MPLX LP (MPLX) has filed with the SEC in the last 24 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 8-K covers material events a company has to report between its quarterly reports, so if you follow MPLX and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full MPLX filings page.
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 reported second-quarter 2026 net income attributable to MPLX of $1,077 million and adjusted EBITDA of $1,775 million, compared with $1,048 million and $1,690 million in the prior-year quarter. The partnership generated $1,702 million of operating cash flow, $1,450 million of distributable cash flow and adjusted free cash flow of $668 million, supporting a $1.0765 per-unit distribution with 1.3x coverage and the return of $1.1 billion of capital. MPLX expects distribution increases of 12.5% in 2026 and 2027.
Crude Oil and Products Logistics segment adjusted EBITDA was $1,161 million and Natural Gas and NGL Services was $614 million, both up versus a year earlier. MPLX raised its 2026 growth capital spending outlook by $500 million to $2.9 billion, directing over 90% toward natural gas and NGL infrastructure, including projects such as the Harmon Creek III plant starting operations in August 2026 and multiple Permian pipeline and treating expansions. As of June 30, 2026, MPLX held $1,031 million in cash, had $2.5 billion available under its bank revolver and $1.5 billion under an intercompany loan, with a leverage ratio of 3.7x and $1.0 billion remaining under unit repurchase authorizations.
MPLX LP reported softer first-quarter 2026 results while continuing heavy investment in growth projects. Net income attributable to MPLX was $912 million, down from $1,126 million a year earlier, mainly due to derivatives impacts, higher interest expense, a prior-year non-recurring benefit, and depreciation. Adjusted EBITDA was $1.729 billion versus $1.757 billion, showing relatively stable operating performance.
Distributable cash flow was $1.408 billion, supporting a higher distribution of $1.0765 per common unit and distribution coverage of 1.3x. The leverage ratio stood at 3.7x. MPLX generated $1.347 billion of net cash from operations and spent heavily on growth, with $791 million of growth capital in the quarter.
The Crude Oil and Products Logistics segment modestly increased adjusted EBITDA to $1.111 billion, while Natural Gas and NGL Services declined to $618 million after a non-recurring 2025 benefit and lower NGL prices. MPLX is advancing a $2.4 billion organic growth plan focused on Permian and Marcellus infrastructure, including the Harmon Creek III gas plant, Titan sour gas treating expansion, and multiple large pipeline and fractionation projects expected in service between late 2026 and 2029.
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 is changing its top accounting leadership structure. Effective April 1, 2026, Erin M. Brzezinski will become Vice President and Controller of MPLX GP LLC and serve as the Partnership’s principal accounting officer, succeeding Rebecca L. Iten, who will move to another accounting leadership role at the Partnership.
The move is designed to better align MPLX’s accounting leadership and operations with Marathon Petroleum Corporation (MPC). Brzezinski already serves as MPC’s principal accounting officer and Vice President and Controller and will retain those responsibilities, reporting to the CFOs of both MPLX GP and MPC in her respective roles.
MPLX does not directly employ its personnel and instead contracts with MPC, so Brzezinski will continue to receive salary, bonuses, long-term incentives and benefits from MPC under its existing compensation and benefit programs described in MPLX’s 2025 annual report.
MPLX LP filed a current report to add key legal documents to its existing shelf registration on Form S-3 (Registration No. 333-271922). The filing attaches an Underwriting Agreement dated February 5, 2026, and two supplemental indentures dated February 12, 2026, each including a form of note. It also includes a legal opinion and related consent from Jones Day supporting the registration.
MPLX LP furnished an update on its recent performance by issuing a press release with financial results for the quarter and year ended December 31, 2025. The partnership attached this press release as an exhibit to the current report, making the details available to investors through that document.
MPLX LP reported a leadership change at its general partner. On December 18, 2025, the sole member of MPLX GP LLC’s Board of Directors elected Maria A. Khoury to serve on the General Partner’s Board, effective January 19, 2026. She is not expected to serve on any standing committees.
On the same effective date, Ms. Khoury will join Marathon Petroleum Corporation, which owns the General Partner and a majority of MPLX LP’s common units, as Executive Vice President and Chief Financial Officer. As an MPC employee, she will serve as a management director on the Board and will not receive separate compensation for her board service.
The company states there are no special arrangements or family relationships related to her election and no related-party transactions requiring disclosure. Ms. Khoury will succeed John J. Quaid, who will cease serving as a director on the effective date, while the Board size remains set at ten directors.
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 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.
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.
MPLX LP filed an 8-K reporting that it has added several exhibits to its Form S-3 registration statement. The filing includes an underwriting agreement naming J.P. Morgan Securities LLC, Goldman Sachs & Co. LLC, BofA Securities, Inc., Mizuho Securities USA LLC, TD Securities (USA) LLC and Wells Fargo Securities, LLC as representatives of the underwriters; four supplemental indentures (Thirty-Second through Thirty-Fifth) with The Bank of New York Mellon Trust Company, N.A. as trustee that include forms of note; and a legal opinion and consent from Jones Day. These exhibits establish the legal and underwriting framework to issue multiple series of notes, but the filing does not disclose offering sizes, interest rates, maturities or other financial terms.