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MPLX LP

For the period ended Jun 30, 2025. Filed Aug 5, 2025.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Jun 30, 2025 · Filed Aug 5, 2025

MPLX$55.91-1.1%Stored close · as of Nov 6, 2026
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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)
☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2025

OR

☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 001-35714

MPLX LP

(Exact name of registrant as specified in its charter)

Delaware27-0005456
(State or other jurisdiction ofincorporation or organization)(I.R.S. EmployerIdentification No.)
200 E. Hardin Street,Findlay,Ohio45840
(Address of principal executive offices)(Zip code)

(419)422-2121

(Registrant’s telephone number, including area code)

Securities Registered pursuant to Section 12(b) of the Act
Title of each classTrading symbol(s)Name of each exchange on which registered
Common Units Representing Limited Partnership InterestsMPLXNew York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☑ No☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☑ No☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer☑Accelerated filer☐Non-accelerated filer☐
Smaller reporting company☐Emerging growth company☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes☐ No☑

MPLX LP had 1,019,065,904 common units outstanding as of July 31, 2025.

Table of Contents

Page
PART I – FINANCIAL INFORMATION
Item 1. · Financial Statements:
Consolidated Statements of Income (Unaudited)3
Consolidated Statements of Comprehensive Income (Unaudited)4
Consolidated Balance Sheets (Unaudited)5
Consolidated Statements of Cash Flows (Unaudited)6
Consolidated Statements of Equity and Series A Preferred Units (Unaudited)7
Notes to Consolidated Financial Statements (Unaudited)8
1. Description of the Business and Basis of Presentation8
2. Accounting Standards and Disclosure Rules8
3. Acquisitions and Other Transactions9
4. Equity Method Investments10
5. Related Party Agreements and Transactions10
6. Equity12
7. Net Income Per Limited Partner Unit13
8. Segment Information14
9. Property, Plant and Equipment16
10. Fair Value Measurements16
11. Derivatives17
12. Debt18
13. Net Interest and Other Financial Costs19
14. Revenue19
15. Supplemental Cash Flow Information22
16. Commitments and Contingencies22
17. Subsequent Events24
Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations25
Item 3.Quantitative and Qualitative Disclosures about Market Risk45
Item 4.Controls and Procedures46
PART II – OTHER INFORMATION
Item 1.Legal Proceedings47
Item 1A.Risk Factors47
Item 2.Unregistered Sales of Equity Securities and Use of Proceeds47
Item 5.Other Information47
Item 6.Exhibits48
Signatures49

Unless otherwise stated or the context otherwise indicates, all references in this Form 10-Q to “MPLX LP,” “MPLX,” “the Partnership,” “us,” “our,” “we,” or like terms refer to MPLX LP and its consolidated subsidiaries. References to our sponsor and customer, “MPC,” refer collectively to Marathon Petroleum Corporation and its subsidiaries, other than the Partnership.

Glossary of Terms

The abbreviations, acronyms and industry terminology used in this report are defined as follows:

ANDXAndeavor Logistics LLC (formerly known as Andeavor Logistics LP), a wholly-owned subsidiary of the Partnership
ASCAccounting Standards Codification
ASUAccounting Standards Update
BarrelOne stock tank barrel, or 42 United States gallons of liquid volume, used in reference to crude oil or other liquid hydrocarbons
DCF (a non-GAAP financial measure)Distributable Cash Flow
EBITDA (a non-GAAP financial measure)Earnings Before Interest, Taxes, Depreciation and Amortization
FASBFinancial Accounting Standards Board
FCF (a non-GAAP financial measure)Free Cash Flow
GAAPAccounting principles generally accepted in the United States of America
MarkWestMarkWest Energy Partners, LP., a wholly-owned subsidiary of the Partnership
mbpdThousand barrels per day
MMBtuOne million British thermal units, an energy measurement
MMcf/dOne million cubic feet per day
NGLNatural gas liquids, such as ethane, propane, butanes and natural gasoline
SECUnited States Securities and Exchange Commission
SOFRSecured Overnight Financing Rate
VIEVariable interest entity
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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.