Mplx's three largest insider shareholders as of April 22, 2026 are Michael J Hennigan (Executive Chairman, 359.14K shares), Frank M Semple (Vice Chairman, 333.34K shares), Dan D Sandman (Director, 127.54K 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 | Molly R Benson | Common Units (Limited Partner Interests) | A | 8,803 | $0.00 | 48,966 | 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 | Carl Kristopher Hagedorn | Common Units (Limited Partner Interests) | A | 4,930 | $0.00 | 22,410 | D | A |
| 01 Mar, 2026 | Shawn M Lyon | Common Units (Limited Partner Interests) | A | 5,986 | $0.00 | 31,040 | D | A |
| 01 Mar, 2026 | Maryann T. Mannen | Common Units (Limited Partner Interests) | A | 52,817 | $0.00 | 178,679 | D | A |
| 02 Mar, 2026 | Carl Kristopher Hagedorn | Common Units (Limited Partner Interests) | D | 422 | $59.22 | 21,988 | D | F |
| 02 Mar, 2026 | Gregory Scott Floerke | Common Units (Limited Partner Interests) | D | 995 | $59.22 | 97,234 | D | F |
| 02 Mar, 2026 | Maryann T. Mannen | Common Units (Limited Partner Interests) | D | 3,407 | $59.22 | 175,272 | D | F |
| 02 Mar, 2026 | Shawn M Lyon | Common Units (Limited Partner Interests) | D | 920 | $59.22 | 30,120 | D | F |
| 02 Mar, 2026 | Molly R Benson | Common Units (Limited Partner Interests) | D | 614 | $59.22 | 48,352 | 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 | Maryann T. Mannen | Common Units (Limited Partner Interests) | D | 3,404 | $59.22 | 171,868 | 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 |