As of May 14, 2026, the three largest insider holders of MPLX are Frank M Semple (Vice Chairman, 333.34K shares), Dan D Sandman (Director, 127.54K shares), Gregory Scott Floerke (Exec. Vp And Coo, 95.34K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Michael J Hennigan | Executive Chairman | 359,137 | 0 | 16 Dec, 2025 |
| Frank M Semple | Vice Chairman | 0 | 333,337 | 03 Feb, 2022 |
| Dan D Sandman | - | 127,542 | 0 | 05 Apr, 2023 |
| Gregory Scott Floerke | Exec. Vp And Coo | 95,337 | 0 | 03 Mar, 2026 |
| Donald C. Templin | President | 81,538 | 0 | 23 Nov, 2021 |
| Christopher A Helms | - | 80,751 | 0 | 19 Feb, 2026 |
| Suzanne Gagle | General Counsel | 67,205 | 0 | 05 Dec, 2023 |
| Garry L. Peiffer | President | 64,072 | 0 | 19 Feb, 2026 |
| Frank M Semple | Vice Chairman | 58,172 | 0 | 19 Feb, 2026 |
| J Michael Stice | - | 53,295 | 0 | 19 Feb, 2026 |
| John J Quaid | Exec Vp And Cfo | 52,393 | 0 | 04 Mar, 2025 |
| Molly R Benson | Chief Legal Ofc Corp Sec | 46,114 | 0 | 03 Mar, 2026 |
| Pamela K.M. Beall | Exec Vp And Cfo | 43,247 | 0 | 13 Dec, 2021 |
| Timothy J Aydt | Exec. Vp And Chief Comm Ofc. | 34,371 | 0 | 03 Mar, 2022 |
| Shawn M Lyon | Senior Vp, Log. Storage | 28,289 | 0 | 03 Mar, 2026 |
| Carl Kristopher Hagedorn | Exec Vp Chief Fin Ofc | 20,409 | 0 | 03 Mar, 2026 |
| Thomas Kaczynski | Senior Vp, Finance Treasurer | 18,091 | 0 | 06 Dec, 2022 |
| Christine S Breves | - | 11,837 | 0 | 19 Feb, 2026 |
| Maria A Khoury | - | 8,451 | 0 | 03 Mar, 2026 |
| Ray N Jr Walker | - | 1,744 | 0 | 19 Feb, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 01 Mar, 2026 | Carl Kristopher Hagedorn | Common Units (Limited Partner Interests) | A | 4,930 | $0.00 | 22,410 | D | A |
| 01 Mar, 2026 | Gregory Scott Floerke | Common Units (Limited Partner Interests) | A | 5,986 | $0.00 | 98,229 | D | A |
| 01 Mar, 2026 | Maria A Khoury | Common Units (Limited Partner Interests) | A | 8,451 | $0.00 | 8,451 | D | A |
| 01 Mar, 2026 | Molly R Benson | Common Units (Limited Partner Interests) | A | 8,803 | $0.00 | 48,966 | D | A |
| 01 Mar, 2026 | Shawn M Lyon | Common Units (Limited Partner Interests) | A | 5,986 | $0.00 | 31,040 | D | A |
| 02 Mar, 2026 | Carl Kristopher Hagedorn | Common Units (Limited Partner Interests) | D | 422 | $59.22 | 21,988 | D | F |
| 02 Mar, 2026 | Molly R Benson | Common Units (Limited Partner Interests) | D | 614 | $59.22 | 48,352 | D | F |
| 02 Mar, 2026 | Gregory Scott Floerke | Common Units (Limited Partner Interests) | D | 995 | $59.22 | 97,234 | D | F |
| 02 Mar, 2026 | Shawn M Lyon | Common Units (Limited Partner Interests) | D | 920 | $59.22 | 30,120 | D | F |
| 02 Mar, 2026 | Shawn M Lyon | Common Units (Limited Partner Interests) | D | 1,033 | $59.22 | 29,087 | D | F |
| 02 Mar, 2026 | Gregory Scott Floerke | Common Units (Limited Partner Interests) | D | 1,100 | $59.22 | 96,134 | D | F |
| 02 Mar, 2026 | Carl Kristopher Hagedorn | Common Units (Limited Partner Interests) | D | 916 | $59.22 | 21,072 | D | F |
| 02 Mar, 2026 | Molly R Benson | Common Units (Limited Partner Interests) | D | 1,240 | $59.22 | 47,112 | D | F |
| 02 Mar, 2026 | Shawn M Lyon | Common Units (Limited Partner Interests) | D | 798 | $59.22 | 28,289 | D | F |
| 02 Mar, 2026 | Carl Kristopher Hagedorn | Common Units (Limited Partner Interests) | D | 663 | $59.22 | 20,409 | D | F |
| 02 Mar, 2026 | Gregory Scott Floerke | Common Units (Limited Partner Interests) | D | 797 | $59.22 | 95,337 | D | F |
| 02 Mar, 2026 | Molly R Benson | Common Units (Limited Partner Interests) | D | 998 | $59.22 | 46,114 | D | F |
| 17 Feb, 2026 | J Michael Stice | Common Units (Limited Partner Interests) | A | 982 | $0.00 | 53,295 | D | A |
| 17 Feb, 2026 | Christine S Breves | Common Units (Limited Partner Interests) | A | 218 | $0.00 | 11,837 | D | A |
| 17 Feb, 2026 | Frank M Semple | Common Units (Limited Partner Interests) | A | 1,072 | $0.00 | 58,172 | D | A |