MPLX LP 8-K

What Happened

• MPLX GP LLC, the general partner of MPLX LP, announced on March 16, 2026 (8-K filed March 18, 2026) that Erin M. Brzezinski, age 43, will be appointed Vice President and Controller of MPLX GP and the Partnership’s principal accounting officer effective April 1, 2026.
• Ms. Brzezinski will succeed Rebecca L. Iten, who will cease serving as VP and Controller on April 1, 2026 but will remain in an accounting leadership role for the Partnership. Ms. Brzezinski currently serves as principal accounting officer and VP & Controller of Marathon Petroleum Corporation (MPC) and will continue in that MPC role.

Key Details

• Effective date: April 1, 2026.
• New officer: Erin M. Brzezinski (age 43); predecessor: Rebecca L. Iten.
• Reporting lines: functionally reports to C. Kristopher Hagedorn, MPLX GP EVP & CFO, and continues reporting to Maria A. Khoury, MPC EVP & CFO, in her MPC capacity.
• Employment and pay: MPLX contracts with MPC for personnel; Ms. Brzezinski will continue to be paid by MPC and remain eligible for MPC’s annual cash bonus (ACB), long-term incentive (LTI) programs and other MPC benefit plans (see MPLX 2025 Form 10‑K for program descriptions).

Why It Matters

• This is a leadership change in MPLX’s accounting and financial reporting function: the Partnership’s principal accounting officer role shifts to an MPC executive, further aligning MPLX’s accounting leadership with Marathon Petroleum’s accounting function.
• For investors, the change signals continuity through integration with MPC’s finance organization and maintained oversight by MPLX’s CFO; there are no disclosed related-party arrangements beyond the existing MPC staffing model and no family relationships noted.