MPLX · Insider Trading
MPLX LP
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-18 | John P Surma | Director | A | +1,563 | — |
| 2026-08-18 | Christopher A Helms | Director | A | +1,336 | — |
| 2026-08-18 | Garry L. Peiffer | Director | A | +1,232 | — |
| 2026-08-18 | Ray N Walker JR | Director | A | +81 | — |
| 2026-08-18 | J Michael Stice | Director | A | +982 | — |
| 2026-08-18 | Frank M Semple | Director | A | +1,072 | — |
| 2026-08-18 | Christine S Breves | Director | A | +218 | — |
| 2026-08-05 | Garry L. Peiffer | Director | A | +2,696 | — |
| 2026-08-05 | John P Surma | Director | A | +3,028 | — |
| 2026-08-05 | Ray N Walker JR | Director | A | +2,696 | — |
| 2026-08-05 | J Michael Stice | Director | A | +3,028 | — |
| 2026-08-05 | Christopher A Helms | Director | A | +2,696 | — |
| 2026-08-05 | Frank M Semple | Director | A | +3,028 | — |
| 2026-08-05 | Christine S Breves | Director | A | +2,696 | — |
| 2026-05-19 | John P Surma | Director | A | +1,656 | — |
| 2026-05-19 | Christine S Breves | Director | A | +276 | — |
| 2026-05-19 | Christopher A Helms | Director | A | +1,415 | — |
| 2026-05-19 | Ray N Walker JR | Director | A | +78 | — |
| 2026-05-19 | J Michael Stice | Director | A | +1,098 | — |
| 2026-05-19 | Garry L. Peiffer | Director | A | +1,303 | — |
| 2026-05-19 | Frank M Semple | Director | A | +1,194 | — |
| 2026-05-04 | Ray N Walker JR | Director | A | +2,246 | — |
| 2026-05-04 | Frank M Semple | Director | A | +2,579 | — |
| 2026-05-04 | Christopher A Helms | Director | A | +2,246 | — |
| 2026-05-04 | John P Surma | Director | A | +2,579 | — |
| 2026-05-04 | Christine S Breves | Director | A | +2,246 | — |
| 2026-05-04 | J Michael Stice | Director | A | +2,579 | — |
| 2026-05-04 | Garry L. Peiffer | Director | A | +2,246 | — |
| 2026-03-03 | Maria A Khoury | Director | A | +8,451 | — |
| 2026-03-03 | Molly R Benson | Chief Legal Ofc & Corp Sec | MIXED | +5,951 | −$168.90K |
| 2026-03-03 | Maryann T. Mannen | Chairman, President & CEO | MIXED | +39,597 | −$782.89K |
| 2026-03-03 | Shawn M Lyon | Senior VP, Log. & Storage | MIXED | +3,235 | −$162.91K |
| 2026-03-03 | Gregory Scott Floerke | Exec. VP and COO | MIXED | +3,094 | −$171.26K |
| 2026-03-03 | Carl Kristopher Hagedorn | Exec VP & Chief Fin Ofc | MIXED | +2,929 | −$118.50K |
| 2026-02-19 | Christine S Breves | Director | A | +218 | — |
| 2026-02-19 | Ray N Walker JR | Director | A | +32 | — |
| 2026-02-19 | Christopher A Helms | Director | A | +1,285 | — |
| 2026-02-19 | Garry L. Peiffer | Director | A | +1,180 | — |
| 2026-02-19 | J Michael Stice | Director | A | +981 | — |
| 2026-02-19 | John P Surma | Director | A | +1,505 | — |
| 2026-02-19 | Frank M Semple | Director | A | +1,071 | — |
| 2025-12-16 | Shawn M Lyon | Senior VP, Log. & Storage | F | −245 | −$13.44K |
| 2025-12-16 | Molly R Benson | Chief Legal Ofc & Corp Sec | F | −306 | −$16.78K |
| 2025-12-16 | Gregory Scott Floerke | Exec. VP and COO | F | −242 | −$13.27K |
| 2025-12-16 | Michael J Hennigan | Executive Chairman | F | −1,335 | −$73.22K |
| 2025-11-18 | J Michael Stice | Director | A | +1,037 | — |
| 2025-11-18 | John P Surma | Director | A | +1,590 | — |
| 2025-11-18 | Ray N Walker JR | Director | A | +33 | — |
| 2025-11-18 | Christine S Breves | Director | A | +230 | — |
| 2025-11-18 | Garry L. Peiffer | Director | A | +1,247 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Frank M Semple | Director | 396,812 | $23.19M |
| Michael J Hennigan | Executive Chairman | 359,137 | $20.99M |
| Maryann T. Mannen | Chairman, President & CEO | 171,868 | $10.04M |
| Garry L. Peiffer | Director | 137,810 | $8.05M |
| John P Surma | Director | 102,947 | $6.02M |
| Gregory Scott Floerke | Exec. VP and COO | 96,134 | $5.62M |
| Christopher A Helms | Director | 86,208 | $5.04M |
| J Michael Stice | Director | 59,112 | $3.45M |
| John J Quaid | Exec VP and CFO | 56,052 | $3.28M |
| Molly R Benson | Chief Legal Ofc & Corp Sec | 46,114 | $2.69M |
| Shawn M Lyon | Senior VP, Log. & Storage | 28,289 | $1.65M |
| Carl Kristopher Hagedorn | Exec VP & Chief Fin Ofc | 21,988 | $1.28M |
| Christine S Breves | Director | 15,038 | $878.84K |
| Maria A Khoury | Director | 8,451 | $493.88K |
| Ray N Walker JR | Director | 4,609 | $269.37K |
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.
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.