X0206 3 2012-10-24 1 0001552000 MPLX LP MPLX 0001557071 Pierson Craig O. C/O MPLX LP 200 E. HARDIN STREET FINDLAY OH 45840 0 1 0 0 Vice President, Operations Exhibit List: Exhibit 24 - Power of Attorney Mr. Pierson is the Vice President, Operations of MPLX GP LLC, the general partner of the Issuer. The Issuer is managed by the directors and executive officers of MPLX GP LLC. /s/ Molly R. Benson, Attorney-in-Fact for Craig O. Pierson 2012-10-24