15 insiders reported 105 Form 4 transactions for MPLX LP (MPLX) over the past 18 months (most recent 2026-05-19). Recent activity: SURMA JOHN P (Director) Buy 1,656 shares, Peiffer Garry L. (Director) Buy 1,304 shares, SEMPLE FRANK M (Director) Buy 1,194 shares, Walker Ray N JR (Director) Buy 78 shares, STICE J MICHAEL (Director) Buy 1,098 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-19 | SURMA JOHN P | Director | Buy | 1,656 | $0 |
| 2026-05-19 | Peiffer Garry L. | Director | Buy | 1,304 | $0 |
| 2026-05-19 | SEMPLE FRANK M | Director | Buy | 1,194 | $0 |
| 2026-05-19 | Walker Ray N JR | Director | Buy | 78 | $0 |
| 2026-05-19 | STICE J MICHAEL | Director | Buy | 1,098 | $0 |
| 2026-05-19 | HELMS CHRISTOPHER A | Director | Buy | 1,415 | $0 |
| 2026-05-19 | Breves Christine S | Director | Buy | 277 | $0 |
| 2026-03-03 | Benson Molly R | Chief Legal Ofc & Corp Sec | Buy | 8,803 | $0 |
| 2026-03-03 | Benson Molly R | Chief Legal Ofc & Corp Sec | Sell | 614 | $36,361 |
| 2026-03-03 | Benson Molly R | Chief Legal Ofc & Corp Sec | Sell | 1,240 | $73,433 |
| 2026-03-03 | Benson Molly R | Chief Legal Ofc & Corp Sec | Sell | 998 | $59,102 |
| 2026-03-03 | Mannen Maryann T. | Chairman, President & CEO | Buy | 52,817 | $0 |
| 2026-03-03 | HAGEDORN CARL KRISTOPHER | Exec VP & Chief Fin Ofc | Buy | 4,930 | $0 |
| 2026-03-03 | Mannen Maryann T. | Chairman, President & CEO | Sell | 3,404 | $201,585 |
| 2026-03-03 | Mannen Maryann T. | Chairman, President & CEO | Sell | 6,409 | $379,541 |
| 2026-03-03 | Lyon Shawn M | Senior VP, Log. & Storage | Buy | 5,986 | $0 |
| 2026-03-03 | Lyon Shawn M | Senior VP, Log. & Storage | Sell | 920 | $54,482 |
| 2026-03-03 | Lyon Shawn M | Senior VP, Log. & Storage | Sell | 1,033 | $61,174 |
| 2026-03-03 | Lyon Shawn M | Senior VP, Log. & Storage | Sell | 798 | $47,258 |
| 2026-03-03 | Mannen Maryann T. | Chairman, President & CEO | Sell | 3,407 | $201,763 |
| 2026-03-03 | Floerke Gregory Scott | Exec. VP and COO | Buy | 5,986 | $0 |
| 2026-03-03 | Floerke Gregory Scott | Exec. VP and COO | Sell | 995 | $58,924 |
| 2026-03-03 | Floerke Gregory Scott | Exec. VP and COO | Sell | 1,100 | $65,142 |
| 2026-03-03 | Floerke Gregory Scott | Exec. VP and COO | Sell | 797 | $47,198 |
| 2026-03-03 | Khoury Maria A | Director | Buy | 8,451 | $0 |
Source: SEC Form 4 filings · as of 2026-05-19