Marathon Petroleum Corp (MPC)

Corporate structure

145 entities across 10 jurisdictions. Read directly from the company’s own 10-K EX-21 filed 2026-02-26 — see the exhibit.

Financial health

Two standard screens, computed from the XBRL in FY2025 against FY2024. Every test shows the numbers behind it — a score with its inputs hidden is a number you cannot check.

Six-year record

Ownership flow

1 institutions tracked — 1 added, 0 reduced.

From 13F filings, which cover institutions managing over $100m and are filed up to 45 days after the quarter ends — so this is a considered position, not a live one, and it is not the whole shareholder register.

Capital returned

What the company actually paid out and bought back, as reported — the record behind any yield figure.

Other petroleum refining companies

Marathon Petroleum Corp files under SIC 2911 — all 10 petroleum refining companies compared on assets and F-score.

Questions about Marathon Petroleum Corp

How many subsidiaries does Marathon Petroleum Corp file with the SEC?

145, listed in its most recent exhibit 21. They are incorporated across 10 jurisdictions, led by Delaware, Mexico, Vermont. That exhibit is filed with the company's annual report and is the company's own list, not an estimate.

Is Marathon Petroleum Corp financially healthy?

Marathon Petroleum Corp scores 6 out of 7 on the Piotroski F-score. Only 7 of the nine tests could be computed from what it filed; the rest need a prior year it has not reported. Every test and the numbers behind it are shown above, so the arithmetic is checkable rather than something you have to take on trust.

Who are the largest institutional holders of Marathon Petroleum Corp?

Among the managers tracked here, the biggest positions as of the 2026-Q2 13F filings are GEODE CAPITAL MANAGEMENT, LLC (adding). Direction is the change in share count against that manager's own previous filing; managers with no prior filing are left out rather than counted as new buyers.