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Whistleblowing as to Accounting Matters

Pursuant to the Sarbanes-Oxley Act of 2002 (“SOX”), Marathon Petroleum Corporation ("MPC") has adopted a Policy for Whistleblowing as to Accounting Matters. This policy establishes procedures for (i) the receipt, retention and treatment of complaints received by the company regarding accounting, internal accounting controls or auditing matters, and (ii) the confidential, anonymous submission by individuals of concerns regarding questionable accounting or auditing matters.

All complaints or concerns received by the company regarding questionable accounting or auditing matters shall be promptly reported to MPC’s Business Integrity and Compliance organization.

Complaints or concerns regarding questionable accounting or auditing matters reported in accordance with the Policy for Whistleblowing as to Accounting Matters shall be kept confidential and information regarding such complaints, including the identity of the source of such complaints, will only be revealed when necessary to carry out the intent of the policy or in such circumstances where the company is required by law to release such information. In addition to all other reporting avenues, individuals may anonymously report such complaints or concerns to MPC’s Integrity Helpline.  All such complaints or concerns shall be categorized according to content and logged to ensure appropriate retention in accordance with the company’s records retention policy.

Any correspondence regarding questionable accounting or auditing matters addressed to the Audit Committees or the Chairs of the Audit Committees of the MPC or MPLX Boards of Directors shall be promptly forwarded to the respective Audit Committee Chairs.

The company will not tolerate any retaliation against an employee for reporting questionable accounting or auditing matters. Filing a good faith report will never be a cause for disciplinary action.

Policy for Whistleblowing as to Accounting Matters