MPLX (MPLX LP)
Insider Trading Activity
Every open-market purchase and sale reported by MPLX officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-18 | JOHN P SURMA | Director | A | — | — |
| 2026-08-18 | CHRISTOPHER A HELMS | Director | A | — | — |
| 2026-08-18 | Garry L. Peiffer | Director | A | — | — |
| 2026-08-18 | Ray N Walker JR | Director | A | — | — |
| 2026-08-18 | J MICHAEL STICE | Director | A | — | — |
| 2026-08-18 | FRANK M SEMPLE | Director | A | — | — |
| 2026-08-18 | Christine S Breves | Director | A | — | — |
| 2026-08-05 | Garry L. Peiffer | Director | A | — | — |
| 2026-08-05 | JOHN P SURMA | Director | A | — | — |
| 2026-08-05 | Ray N Walker JR | Director | A | — | — |
| 2026-08-05 | J MICHAEL STICE | Director | A | — | — |
| 2026-08-05 | CHRISTOPHER A HELMS | Director | A | — | — |
| 2026-08-05 | FRANK M SEMPLE | Director | A | — | — |
| 2026-08-05 | Christine S Breves | Director | A | — | — |
| 2026-05-19 | JOHN P SURMA | Director | A | — | — |
| 2026-05-19 | Christine S Breves | Director | A | — | — |
| 2026-05-19 | CHRISTOPHER A HELMS | Director | A | — | — |
| 2026-05-19 | Ray N Walker JR | Director | A | — | — |
| 2026-05-19 | J MICHAEL STICE | Director | A | — | — |
| 2026-05-19 | Garry L. Peiffer | Director | A | — | — |
| 2026-05-19 | FRANK M SEMPLE | Director | A | — | — |
| 2026-05-04 | Ray N Walker JR | Director | A | — | — |
| 2026-05-04 | FRANK M SEMPLE | Director | A | — | — |
| 2026-05-04 | CHRISTOPHER A HELMS | Director | A | — | — |
| 2026-05-04 | JOHN P SURMA | Director | A | — | — |
| 2026-05-04 | Christine S Breves | Director | A | — | — |
| 2026-05-04 | J MICHAEL STICE | Director | A | — | — |
| 2026-05-04 | Garry L. Peiffer | Director | A | — | — |
| 2026-03-03 | Maria A Khoury | Director | A | — | — |
| 2026-03-03 | Molly R Benson | Chief Legal Ofc & Corp Sec | MIXED | — | — |
| 2026-03-03 | Maryann T. Mannen | Chairman, President & CEO | MIXED | — | — |
| 2026-03-03 | Shawn M Lyon | Senior VP, Log. & Storage | MIXED | — | — |
| 2026-03-03 | Gregory Scott Floerke | Exec. VP and COO | MIXED | — | — |
| 2026-03-03 | CARL KRISTOPHER HAGEDORN | Exec VP & Chief Fin Ofc | MIXED | — | — |
| 2026-02-19 | Christine S Breves | Director | A | — | — |
| 2026-02-19 | Ray N Walker JR | Director | A | — | — |
| 2026-02-19 | CHRISTOPHER A HELMS | Director | A | — | — |
| 2026-02-19 | Garry L. Peiffer | Director | A | — | — |
| 2026-02-19 | J MICHAEL STICE | Director | A | — | — |
| 2026-02-19 | JOHN P SURMA | Director | A | — | — |
| 2026-02-19 | FRANK M SEMPLE | Director | A | — | — |
| 2025-12-16 | Shawn M Lyon | Senior VP, Log. & Storage | F | — | — |
| 2025-12-16 | Molly R Benson | Chief Legal Ofc & Corp Sec | F | — | — |
| 2025-12-16 | Gregory Scott Floerke | Exec. VP and COO | F | — | — |
| 2025-12-16 | Michael J Hennigan | Executive Chairman | F | — | — |
| 2025-11-18 | J MICHAEL STICE | Director | A | — | — |
| 2025-11-18 | JOHN P SURMA | Director | A | — | — |
| 2025-11-18 | Ray N Walker JR | Director | A | — | — |
| 2025-11-18 | Christine S Breves | Director | A | — | — |
| 2025-11-18 | Garry L. Peiffer | Director | A | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | Director | 665,997,540 | — |
| — | Director | 86,619,313 | — |
| — | Director | 17,056,515 | — |
| — | Exec VP and COO | 413,452 | — |
| — | Director | 396,812 | — |
| — | Director | 385,168 | — |
| — | Executive Chairman | 359,137 | — |
| — | Exec VP and CFO | 182,779 | — |
| — | Exec VP and CCO | 177,552 | — |
| — | Chairman, President & CEO | 171,868 | — |
| — | Chairman, CEO | 141,780 | — |
| — | Director | 137,810 | — |
| — | Director | 127,542 | — |
| — | Exec. VP and Gen Counsel | 123,705 | — |
| — | Director | 102,947 | — |
| — | Director | 99,537 | — |
| — | Exec. VP and COO | 96,134 | — |
| — | Director | 86,208 | — |
| — | General Counsel | 67,205 | — |
| — | Director | 59,112 | — |
| — | Exec VP and CFO | 56,052 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MPLX quote page; the site-wide leaderboard is on the insider transactions hub.