Who audits MPC? — PricewaterhouseCoopers LLP
Marathon Petroleum Corp is audited by PricewaterhouseCoopers LLP, serving as auditor since 2010 (PCAOB ID No. 238). Most recent audit opinion is clean (unqualified), dated 2025-12-31.
Opinion — Cited Language
“In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 3…”
Critical Audit Matters (1)
Source Filing
What MPC's Auditor Relationship Tells You
The independent auditor signs off on a public company's financial statements every year — issuing an opinion on whether those statements present fairly the company's financial position. Auditor identity, tenure, and opinion type are structural risk signals that institutional investors evaluate before relying on any reported numbers. For Marathon Petroleum Corp, the current auditor is PricewaterhouseCoopers LLP — a relationship that has run since 2010.
Auditor tenure is one of the most-watched signals. Very short tenure (under 3 years) can signal a recent change — sometimes routine, sometimes prompted by audit disagreements or fee disputes. Very long tenure (over 20 years) can raise independence concerns under SEC rotation guidance, though there is no mandatory rotation rule in the United States. PricewaterhouseCoopers LLP has served Marathon Petroleum Corp for 16 years.
Opinion type is the binary signal. A clean unqualified opinion is what investors expect; any deviation — explanatory paragraph, going-concern doubt, qualified opinion — is a material disclosure that should be read carefully. Marathon Petroleum Corp's most recent audit opinion is classified as Clean (Unqualified). Standard unqualified opinion — auditor concurs with management presentation.
Critical Audit Matters (CAMs) are areas the auditor identified as involving especially challenging, subjective, or complex judgment. Required disclosure since PCAOB AS 3101 took effect in 2019-2020. CAMs surface the specific accounts and disclosures the auditor spent extra effort on — for example, revenue recognition with bundled performance obligations, or fair-value measurement of illiquid assets. For MPC, the cited CAMs are listed above; each is a hint to where management judgment is most consequential.
For broader context on MPC's risk profile, see the MPC Overview, the Going Concern page, or the Dilution page.