MPLX LP

On October 30, 2026, MPLX and MPC Investment LLC (“MPCI”) entered into a second amended and restated loan agreement (the “Amended and Restated MPC Loan Agreement”) to increase the borrowing capacity under the intercompany loan agreement with MPCI from $1.5 billion to $2.5 billion in aggregate principal amount of all loans outstanding at any one time, and extended the term of the intercompany loan agreement from July 31, 2029, to October 30, 2031, provided that MPCI may demand payment of all or any portion of the outstanding principal amount of the loans, together with all accrued and unpaid interest and other amounts (if any) payable thereunder, at any time prior to the expiration date. Borrowings under the Amended and Restated MPC Loan Agreement will bear interest at one-month Term SOFR plus 1.25 percent or such lower rate that would be applicable to such borrowings under MPLX’s bank revolving credit facility.

The foregoing description of the Amended and Restated MPC Loan Agreement is not complete and is qualified in its entirety by reference to the full text of the Amended and Restated MPC Loan Agreement, which is filed herewith as Exhibit 10.2 to this Quarterly Report on Form 10-Q and incorporated by reference herein.

MPCI is a wholly owned subsidiary of MPC and the sole member of our general partner. In addition to controlling our general partner, MPC owned approximately 64 percent of the outstanding MPLX common units as of September 30, 2026.

During the quarter ended September 30, 2026, no director or officer (as defined in Rule 16a-1(f) promulgated under the Exchange Act) of MPLX adopted orterminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement” (as each term is defined in Item 408 of Regulation S-K).