Investor Presentaiton

Simplified Organizational Structure Current¹ Marathon Petroleum Corporation (NYSE:MPC) Non-economic 100% GP interest 36.5% of Common Units Outstanding MPLX GP LLC Non-economic 100% GP interest Tesoro Logistics GP, LLC 36.4% of Common Units Outstanding Pro Forma1 M MARATHON Marathon Petroleum Corporation (NYSE:MPC) Non-economic 100% GP interest MPLX GP LLC 63.0% of Common Units Outstanding Public MPLX Holders MPLX LP (NYSE:MPLX) 63.5% of Common Units Outstanding 63.6% of Common Units Outstanding Andeavor Logistics LP (NYSE:ANDX) MPLX Public Public MPLX Holders ANDX Holders LP (NYSE:MPLX) 1 Simplified structure charts do not portray all operating subsidiaries or 30 million of MPLX preferred units and 0.6 million of ANDX preferred units; as of announcement 37.0% of Common Units Outstanding 5

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