Marathon Petroleum Corp. and Andeavor filed a joint definitive proxy statement and prospectus with the U.S. Securities and Exchange Commission regarding the pending merger pursuant to which MPC has agreed to acquire all of Andeavor's outstanding shares.

A special meeting of Andeavor stockholders has been set for Monday, Sept. 24, 2018, at 9 a.m. Central Time at the JW Marriott San Antonio, 23808 Resort Parkway, San Antonio, Texas 78261, to approve the previously announced Agreement and Plan of Merger, dated April 30, 2018, by and among Andeavor, MPC and certain wholly owned subsidiaries of MPC, and other matters related to the merger.

A special meeting of MPC stockholders has been set for Monday, Sept. 24, 2018, at 10 a.m. Eastern Time at MPC's offices at 539 South Main Street, Findlay, Ohio 45840, to approve the issuance of MPC common stock in connection with the merger and other matters related to the merger, as well as a proposal to increase the number of authorized shares of MPC common stock and a proposal to increase the maximum number of directors permitted to serve on the MPC board of directors.

Subject to approval of the Andeavor and MPC stockholders and other customary closing conditions, the parties expect to close the transaction on Oct. 1, 2018.

MPC and Andeavor each urge their stockholders to submit their proxies as promptly as possible, either by telephone, via the internet or by marking, signing and dating the applicable proxy card that will be provided to MPC and Andeavor stockholders along with the joint proxy statement and prospectus. The joint proxy statement and prospectus for the special meetings will be mailed to MPC and Andeavor stockholders on or about Aug. 6, 2018.

All holders of record of MPC and/or Andeavor common stock as of the close of business on Aug. 1, 2018, will be entitled to receive notice of their applicable special meeting and to vote their respective common stock, either in person or by proxy, at their respective special meeting.

About Marathon Petroleum Corporation

MPC (NYSE: MPC) is the nation's second-largest refiner, with a crude oil refining capacity of approximately 1.9 million barrels per calendar day in its six-refinery system. Marathon brand gasoline is sold through approximately 5,600 independently owned retail outlets across 20 states and the District of Columbia. In addition, Speedway LLC, an MPC subsidiary, owns and operates the nation's second-largest convenience store chain, with approximately 2,740 convenience stores in 22 states. MPC owns, leases or has ownership interests in approximately 10,800 miles of crude oil and light product pipelines. Through subsidiaries, MPC owns the general partner of MPLX LP, a midstream master limited partnership. Through MPLX, MPC has ownership interests in gathering and processing facilities with approximately 5.9 billion cubic feet per day of gathering capacity, 8.7 billion cubic feet per day of natural gas processing capacity and 610,000 barrels per day of fractionation capacity. MPC's fully integrated system provides operational flexibility to move crude oil, NGLs, feedstocks and petroleum-related products efficiently through the company's distribution network and midstream service businesses in the Midwest, Northeast, East Coast, Southeast and Gulf Coast regions.

About Andeavor

Andeavor (NYSE: ANDV) is a premier, highly integrated marketing, logistics and refining company. Andeavor's retail-marketing system includes more than 3,200 stores marketed under multiple well-known fuel brands, including ARCO®, SUPERAMERICA®, Shell®, Exxon®, Mobil®, Tesoro®, USA Gasoline(TM) and Giant®. It also has ownership in Andeavor Logistics LP and its non-economic general partner. Andeavor operates 10 refineries with a combined capacity of approximately 1.2 million barrels per day in the mid-continent and western United States.