[8-K] MPLX LP Reports Material Event

Rhea-AI Filing Summary

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.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________________________

FORM 8-K

_____________________________________________

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) November 4, 2025

 _____________________________________________

MPLX LP

(Exact name of registrant as specified in its charter)

_____________________________________________

Delaware

001-35714

27-0005456

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

200 E. Hardin Street, Findlay, Ohio 45840

(Address of principal executive offices) (Zip code)

Registrant’s telephone number, including area code: (419) 422-2121

_____________________________________________

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: 

☐			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:
Title of each class			Trading symbol(s)			Name of each exchange on which registered
Common Units Representing Limited Partnership Interests			MPLX			New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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.

☐

Item 2.02 Results of Operations and Financial Condition

On November 4, 2025, MPLX LP issued a press release announcing its financial results for the quarter ended September 30, 2025. The press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Information in this Item 2.02 and Exhibit 99.1 of Item 9.01 below shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise incorporated by reference into any filing pursuant to the Securities Act of 1933, as amended, or the Exchange Act except as otherwise expressly stated in such a filing.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits.

Exhibit Number						Description
99.1						Press Release issued by MPLX LP on November 4, 2025
104						Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

			MPLX LP
			By:						MPLX GP LLC, its General Partner
Date: November 4, 2025			By:						/s/ C. Kristopher Hagedorn
									Name: C. Kristopher Hagedorn
									Title: Executive Vice President and Chief Financial Officer

FAQ

What did MPLX (MPLX) announce in this 8-K?

MPLX furnished a press release announcing its financial results for the quarter ended September 30, 2025, attached as Exhibit 99.1.

Is the earnings information considered filed or furnished?

The Item 2.02 information and Exhibit 99.1 are designated as furnished and not deemed filed under the Exchange Act.

Which period do the results cover for MPLX (MPLX)?

The press release covers the quarter ended September 30, 2025.

Where can I find the detailed results?

Detailed results are in the press release attached as Exhibit 99.1.

What is MPLX’s trading symbol and exchange?

MPLX’s common units trade under MPLX on the New York Stock Exchange.

When was the press release issued?

The press release was issued on November 4, 2025.