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MPLX LP

For the period ended Dec 31, 2024. Filed Feb 27, 2025.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2024 · Filed Feb 27, 2025

MPLX$56.80+1.6%Stored close · as of Nov 9, 2026

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Contents

Management's Report on Internal Control over Financial Reporting

MPLX LP’s management is responsible for establishing and maintaining adequate internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934, as amended). An evaluation of the design and effectiveness of our internal control over financial reporting, based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, was conducted under the supervision and with the participation of management, including the chief executive officer and chief financial officer of our general partner. Based on the results of this evaluation, MPLX LP’s management concluded that its internal control over financial reporting was effective as of December 31, 2024.

The effectiveness of MPLX LP’s internal control over financial reporting as of December 31, 2024 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which is included herein.

/s/ Maryann T. Mannen/s/ C. Kristopher Hagedorn
Maryann T. MannenPresident and Chief Executive Officer of MPLX GP LLC (the general partner of MPLX LP)C. Kristopher HagedornExecutive Vice President and Chief Financial Officer of MPLX GP LLC (the general partner of MPLX LP)
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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.