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.
The MPLX LP (NYSE: MPLX) SEC filings page on Stock Titan provides access to the partnership’s regulatory disclosures filed with the U.S. Securities and Exchange Commission. As a large-cap master limited partnership operating midstream energy infrastructure and logistics assets, MPLX uses its SEC filings to report financial results, describe segment performance, document governance changes, and outline material transactions and financing activities.
Key documents for MPLX include annual reports on Form 10-K and quarterly reports on Form 10-Q, which present detailed information on the Crude Oil and Products Logistics and Natural Gas and NGL Services segments, including pipeline and terminal throughput, gathering and processing volumes, and NGL fractionation activity. These reports also discuss non-GAAP measures such as adjusted EBITDA, distributable cash flow, adjusted free cash flow, and leverage ratio, along with reconciliations to the most directly comparable GAAP measures.
MPLX’s current reports on Form 8-K highlight specific events such as quarterly and year-to-date financial results, changes in the board of directors of its general partner, leadership appointments, securities offerings, and the filing of underwriting agreements and supplemental indentures related to senior notes. These filings also reference press releases that provide additional operational and financial context.
On Stock Titan, AI-powered tools can help interpret MPLX’s filings by summarizing lengthy documents, clarifying segment-level disclosures, and highlighting items related to capital structure, distributions, and governance. Users can quickly locate information on MPLX’s debt offerings, board changes, and reported financial metrics without reading every page of each filing. Real-time updates from EDGAR ensure that new 10-K, 10-Q, and 8-K filings, as well as exhibits such as underwriting agreements and indentures, are available as they are posted, supporting more efficient review of MPLX’s regulatory reporting history.
Director J. Michael Stice reported an acquisition of MPLX common units. On 08/15/2025 he acquired 962.494 common units at a reported price of $0, increasing his total beneficial ownership to 51,275.827 common units. The filing shows 700 units held indirectly by The Mike Stice Trust. The reporting person is a director of MPLX GP LLC, the issuer's general partner.
Frank M. Semple, a director of MPLX GP LLC, reported a transaction in MPLX common units on 08/15/2025. The filing shows an acquisition of 1,050.574 common units at a reported price of $0, and indicates 55,968.214 common units beneficially owned following the transaction as direct holdings. Additional indirect holdings are reported: 333,337 units through Frank M Semple Revocable Trust, 111,180 through Robin Y Semple 2012 Dynasty Trust, and 48,777 through EK Holdings LLC. The form is signed by an attorney-in-fact on behalf of Mr. Semple.
Garry L. Peiffer, a director of MPLX GP LLC (the general partner of MPLX LP), reported an acquisition of 1,157.128 common units of MPLX on 08/15/2025. The reported transaction lists a price of $0. After the transaction, the filing shows 61,644.675 common units beneficially owned directly and 68,497 beneficially owned indirectly by the Garry L. Peiffer Revocable Trust. The Form 4 was signed by an attorney-in-fact on 08/19/2025.
Insider transaction reported for MPLX LP (MPLX). Christopher A. Helms, listed as a director of MPLX GP LLC (the issuer's general partner), reported acquiring 1,259.684 common units on 08/15/2025 at a reported price of $0, bringing his beneficial ownership to 78,108.263 common units. The form was signed by an attorney-in-fact on 08/19/2025.
The filing reports that Christine S. Breves, a director of MPLX GP LLC (the general partner of MPLX LP), acquired 213.782 common units of MPLX on 08/15/2025 at a reported price of $0. After the transaction she beneficially owned 11,388.941 common units. The form indicates Breves files as a reporting person and was signed on behalf of Breves by Molly R. Benson, Attorney-in-Fact, on 08/19/2025.
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.
MPLX LP is offering $4.5 billion of senior notes across four maturities: $1.25B 4.800% due 2031, $750M 5.000% due 2033, $1.5B 5.400% due 2035 and $1.0B 6.200% due 2055. Net proceeds are expected to be approximately $4,415 million.
The company intends to use part of the proceeds to fund the $2.375 billion Northwind acquisition and related fees, and to restore liquidity after completing the BANGL acquisition for roughly $700 million (plus up to a $275 million earnout) and repaying about $656 million of BANGL debt. The 2031 and 2033 notes are subject to a special mandatory redemption at 101% if the Northwind acquisition is not consummated by the later of July 11, 2026 (the Termination Date) or five business days after any agreed extension, or if MPLX notifies the trustee it will not pursue the acquisition.
MPLX LP Q2 2025 (10-Q) highlights: total revenue & other income slipped 1.6 % YoY to $3.0 bn while costs rose 4.7 %, driving an 8.9 % drop in operating income to $1.29 bn. Net income attributable to MPLX fell 10.9 % to $1.05 bn ($1.03/unit). For the first half, net income remained flat at $2.17 bn and diluted EPS held at $2.13.
Cash & capital: operating cash flow increased 4 % to $2.98 bn, comfortably funding $609 m capex, $1.95 bn unitholder distributions and $200 m buy-backs. Cash balance sits at $1.39 bn; no revolver borrowings. Long-term debt rose to $19.7 bn after issuing $2 bn of 5.40 %‒5.95 % notes and retiring $1.2 bn of 4.875 % 2025 notes; leverage ≈3.3× annualised Adj-EBITDA.
Growth & portfolio moves: bought an additional 5 % of the Matterhorn Express pipeline for $151 m (total 10 %), closed the $237 m Whiptail Midstream gathering acquisition, and invested $322 m into gas/NGL JVs. Segment Adjusted EBITDA gained 2 % to $1.69 bn (Crude Logistics $1.14 bn; NatGas/NGL $0.55 bn).
Unitholder returns: quarterly distribution lifted 13 % YoY to $0.9565/unit (payable 15 Aug); remaining buy-back authorisation $320 m. Series A preferred units fully converted to common.
Key watch-items: margin compression, rising interest expense ($488 m YTD), legal risk around Dakota Access potential shut-down, and debt-funded growth impact on leverage. Contracted minimum-volume backlog totals $6.4 bn, underpinning long-term cash flows.
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