Marathon Petroleum Corporation (MPC) ownership: Top institutional holder: VANGUARD GROUP INC ($6.23B). Insider activity: Net Seller (3 buys, 17 sells). 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 38291917.00 | $6.23B | 2025-12-31 |
| BlackRock, Inc. | 24394842.00 | $5.96B | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 19170094.00 | $4.68B | 2026-03-31 |
| STATE STREET CORP | 19025020.00 | $4.65B | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 15672113.00 | $3.83B | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 7821524.00 | $1.90B | 2026-03-31 |
| MORGAN STANLEY | 6073543.00 | $1.48B | 2026-03-31 |
| RAYMOND JAMES FINANCIAL INC | 5773769.00 | $1.41B | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-04-30 | |
| Sell | null | 2026-04-30 | |
| Sell | null | 2026-04-30 | |
| Sell | null | 2026-04-30 | |
| Sell | null | 2026-04-30 | |
| Sell | null | 2026-04-30 | |
| Sell | null | 2026-04-30 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.