In connection with the issuance by MPLX LP (“MPLX”) of 69,159 common units upon the vesting of phantom units under the MPLX LP 2012 Incentive Compensation Plan and 8,511,405 common units under MPLX’s at-the-market equity offering program, MPLX GP LLC purchased an aggregate of 175,113 general partner units for a total of $5,928,325.51 in cash during the three months ended June 30, 2017, to maintain its two percent general partner interest in MPLX. The general partner units were issued in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended.

About MPLX LP (NYSE:MPLX)

MPLX LP is a United States-based diversified master limited partnership (MLP) company, which owns, operates, develops and acquires midstream energy infrastructure assets. The Company is engaged in the gathering, processing and transportation of natural gas; the gathering, transportation, fractionation, storage and marketing of natural gas liquids (NGLs); and the gathering, transportation and storage of crude oil and refined petroleum products. The Company’s segments are Logistics and Storage (L&S) and Gathering and Processing (G&P). Its assets include infrastructure to support Marathon Petroleum Corporation (MPC), including approximately 2,900 miles of crude oil and refined product pipelines across over nine states. The Company owns a barge dock facility with approximately 80 thousand barrels per day (mbpd) of crude oil and product throughput capacity, as well as crude oil and product storage facilities with approximately 4,530 thousand barrels (mbbls) of available storage capacity.