Marathon Petroleum MPC
$372.74 −$4.58 (-1.21%)
Market closed · Nov 6, 8:10 pm ET · Last extended-hours $375.00 +0.61%
Open$379.62
Prev close$377.32
Day range$367.72 – $381.67
Volume2.48M
Market cap$101.49B
P/E (TTM)7.4
Dividend yield1.07%
Ownership & positioning
Who holds it, who is betting against it, and where the big money is moving
Institutional ownership79.0%+0.90 pts vs. prior quarter
Institutions holding2,359+181 vs. prior quarter
Insider trades (recent)18 buys / 32 sellsNet selling
Short interest2.54% of floatDays to cover 3.7 · as of 15 Oct 2026
Short-sale volume share13.0%5-day average of daily volume
Short-sale volume as % of daily volume
Large-order net flow, last 20 sessions
Net of large-order buying minus selling, in USD. Over this window: −$98.38M (8 inflow days, 12 outflow days).
Net flow by order size, last 20 sessions
Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.
The five largest holders on file together own 31.3% of shares outstanding.
Largest holders
By investor type
Reported short interest has risen from 2.32% to 2.54% of float over the last 6 biweekly reports (31 Jul 2026 to 15 Oct 2026).
Recent institutional activity
| Holder | Type | Period | Share change | New stake |
|---|---|---|---|---|
| Amanah Holdings Trust | Mutual Fund | 2026/Q3 | +377,543 | 0.1% |
| BlackRock | Mutual Fund | 2026/Q3 | +1,611,175 | 9.3% |
| Victory Capital Management Inc. | Mutual Fund | 2026/Q3 | +593,529 | 0.4% |
| American Century Investment Management | Mutual Fund | 2026/Q3 | +561,825 | 0.3% |
| T. Rowe Price Group, Inc. | Mutual Fund | 2026/Q3 | +556,805 | 0.7% |
| Geode Capital Management, LLC | Mutual Fund | 2026/Q3 | +529,633 | 3.0% |
| FMR | Mutual Fund | 2026/Q3 | +506,580 | 1.5% |
| UBS Asset Management | Mutual Fund | 2026/Q3 | +383,716 | 1.2% |
| AQR Capital Management | Hedge Fund | 2026/Q3 | +383,654 | 0.3% |
| BNP Paribas Financial Markets SNC | Private Company | 2026/Q3 | +372,484 | 0.3% |
| Amundi Asset Management | Mutual Fund | 2026/Q3 | +309,756 | 0.8% |
| Australian Super | Government Pension Fund | 2026/Q3 | +307,698 | 0.3% |
| Bridgewater Associates | Hedge Fund | 2026/Q3 | +271,941 | 0.1% |
| Lazard Asset Management LLC | Mutual Fund | 2026/Q3 | +253,776 | 0.1% |
| Citadel Advisors LLC | Hedge Fund | 2026/Q3 | +210,192 | 0.1% |
Institutional buy/sell activity by reporting period, largest moves first.
Insider transactions
| Date | Insider | Title | Transaction | Shares | Price | Held after |
|---|---|---|---|---|---|---|
| 30 Aug 2026 | Shawn Lyon | Senior Vice President Logistics and Storage of MPLX | Intent to Sell (Form 144) | -1,000 | $375.74 | – |
| 30 Aug 2026 | Shawn Lyon | Senior Vice President Logistics and Storage of MPLX | Open Market Disposition | -1,425 | $375.75 | 14,133 |
| 27 Aug 2026 | Shawn Lyon | Senior Vice President Logistics and Storage of MPLX | Intent to Sell (Form 144) | -425 | $368.49 | – |
| 26 Aug 2026 | Erin Brzezinski | Vice President | Open Market Disposition | -570 | $362.79 | 1,576 |
| 23 Aug 2026 | Carl Hagedorn | Former Officer | Intent to Sell (Form 144) | -897 | $361.16 | – |
| 16 Aug 2026 | Molly Benson | Chief Legal Officer | Derivative Exercise and Sale | -17,196 | $358.57 | 30,423 |
| 12 Aug 2026 | Shawn Lyon | Senior Vice President Logistics and Storage of MPLX | Open Market Disposition | -2,500 | $350.00 | 15,558 |
| 11 Aug 2026 | Michael Henschen | Executive Vice President of Refining | Open Market Disposition | -6,011 | $341.56 | 10,889 |
| 2 Aug 2026 | Maryann Mannen | Chairperson & CEO | Sale to Issuer | -908 | $311.78 | 110,939 |
| 3 Jun 2026 | Michael Henschen | Executive Vice President of Refining | Open Market Disposition | -1,372 | $268.75 | 16,900 |
| 3 Jun 2026 | Michael Henschen | Executive Vice President of Refining | Derivative Exercise and Sale | -4,964 | $268.85 | 16,900 |
| 12 May 2026 | Rick Hessling | Chief Commercial Officer | Open Market Disposition | -1,000 | $250.00 | 6,525 |
| 29 Apr 2026 | Frank Semple | Independent Director | Other Acquisition | +727 | – | 14,720 |
| 29 Apr 2026 | John Surma | Lead Independent Director | Other Acquisition | +727 | – | 60,901 |
| 29 Apr 2026 | Jonathan Cohen | Independent Director | Other Acquisition | +727 | – | 16,235 |
| 29 Apr 2026 | Evan Bayh | Independent Director | Other Acquisition | +727 | – | 61,901 |
| 29 Apr 2026 | Jeffrey Campbell | Independent Director | Other Acquisition | +727 | – | 2,581 |
| 29 Apr 2026 | Kim K. Rucker | Independent Director | Other Acquisition | +727 | – | 19,955 |
| 29 Apr 2026 | Eileen Paterson | Independent Director | Other Acquisition | +727 | – | 3,203 |
| 29 Apr 2026 | Abdulaziz Bin Fahd Al-Khayyal | Former Independent Director | Other Acquisition | +727 | – | 25,951 |
From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.
Short interest, by report
| Report date | Shares short | % of float | Days to cover |
|---|---|---|---|
| 15 Oct 2026 | 7,145,349 | 2.5% | 3.7 |
| 30 Sep 2026 | 7,039,952 | 2.5% | 2.0 |
| 15 Sep 2026 | 7,715,203 | 2.7% | 3.2 |
| 31 Aug 2026 | 7,601,383 | 2.7% | 3.0 |
| 14 Aug 2026 | 6,521,760 | 2.3% | 2.5 |
| 31 Jul 2026 | 6,786,536 | 2.3% | 3.4 |
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