Marathon Petroleum Corp — M&A Activity 2018

May 15, 2018

Filed by Marathon Petroleum Corporation

Commission File No.: 001-35054

Pursuant to Rule 425 under the

Securities Act of 1933, as amended

Subject Company:

Andeavor

Commission File No.: 001-03473

The following slides were made available by Marathon Petroleum Corporation on its website on May 15, 2018.

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