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.
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Insider acquisition recorded: On 08/25/2025 Ray N. Walker Jr., a director of MPLX GP LLC (the general partner of MPLX LP), was reported acquiring 1,677.632 common units of MPLX at a stated price of $0. Following the transaction, he beneficially owns 1,677.632 units. The filing is signed by an attorney-in-fact on behalf of Mr. Walker.
John P. Surma, reported as a director of MPLX GP LLC (the general partner of MPLX LP), executed a transaction on 08/15/2025 acquiring 1,475.301 common units (limited partner interests). The form reports a price of $0 for the transaction and shows 86,095.058 common units beneficially owned following the reported transaction. The filing was signed by an attorney-in-fact, Molly R. Benson, on 08/19/2025.
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.
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