First Amendment dated as of January 1, 2023 to Amended and Restated Loan Agreement dated as of July 31, 2019 by and between MPLX and MPC Investment LLC

THIS FIRST AMENDMENT TO THE AMENDED AND RESTATED LOAN AGREEMENT (“Amendment”) is effective as of January 1, 2023, by and between MPLX LP, a Delaware limited partnership (the “Borrower”), and MPC Investment LLC, a Delaware limited liability company (the “Lender”). The Borrower and the Lender may be singularly referred to as a “Party” and collectively referred to as the “Parties”.

1.Purpose. The Parties acknowledge and agree that this Amendment is made and entered into for the purpose of modifying certain terms and/or conditions of the Amended and Restated Loan Agreement entered into by the Parties on July 31, 2019 (the “Loan Agreement”). The terms and conditions set forth in this Amendment shall supersede and replace the provisions of the Agreement identified herein. All terms and conditions of the Loan Agreement not modified by this Amendment shall remain in full force and effect as set forth in the Loan Agreement. All capitalized terms set forth in this Amendment shall have the same meanings as set forth in the Loan Agreement.

2.Modification. Section 3.1 of the Loan Agreement is hereby amended and replaced in its entirety with the following:

“3.1    Interest. Interest shall accrue on the unpaid principal amount of the Loans at a rate equal to the sum of (i) the one (1) month term, Term SOFR Rate (SOFR Rate) for dollar deposits, as published by the CME Term SOFR Administrator on the first Business Day of such Interest Period adjusted upward by .10%, plus (ii) a premium of one hundred twenty-five basis points (1.25%) or such lower premium applicable to one-month SOFR Rate based borrowings under the Credit Facility. Interest shall be calculated for each Interest Period on the daily principal balance of the Loan outstanding during such Interest Period on the basis of a year of 360 days for the actual number of days elapsed. The Lender’s calculation of interest accruing on any Loan shall be presumed accurate absent manifest error. In the event that borrowings based on the SOFR Rate (or a derivative thereof) cease to be available to the Borrower under the Credit Facility, the Borrower and the Lender shall negotiate in good faith to amend this Agreement to provide for a mutually agreeable replacement interest rate.”

IN WITNESS WHEREOF, each of the Parties has executed this First Amendment to the Loan Agreement as of the date first written above.