Time on boards
- Boards served
- 2
- Current seats
- 2
- Board service
- 8 years
- Director since
- 2023
8 years of board service in total across 2 boards, counting each seat separately. Longest: Marathon Petroleum Corporation, 3 years.
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
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Marathon Petroleum Corporation April 24, 202496.7%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Aug 14, 2026 | Mplx LP | Grant or award | +1,073 | — | — |
| May 15, 2026 | Mplx LP | Grant or award | +1,194 | — | — |
| Apr 30, 2026 | Mplx LP | Grant or award | +2,580 | — | — |
| Apr 30, 2026 | Marathon Petroleum Corporation | Grant or award | +728 | — | — |
| Feb 17, 2026 | Mplx LP | Grant or award | +1,072 | — | — |
| Nov 14, 2025 | Mplx LP | Grant or award | +1,132 | — | — |
| Aug 15, 2025 | Mplx LP | Grant or award | +1,051 | — | — |
| May 16, 2025 | Mplx LP | Grant or award | +990 | — | — |
| May 1, 2025 | Mplx LP | Grant or award | +2,848 | — | — |
| May 1, 2025 | Marathon Petroleum Corporation | Grant or award | +1,276 | — | — |
| Apr 1, 2025 | Mplx LP | Grant or award | +220 | — | — |
| Apr 1, 2025 | Marathon Petroleum Corporation | Grant or award | +94 | — | — |
| Feb 14, 2025 | Mplx LP | Grant or award | +888 | — | — |
| Jan 2, 2025 | Mplx LP | Grant or award | +738 | — | — |
| Jan 2, 2025 | Marathon Petroleum Corporation | Grant or award | +294 | — | — |
Questions about Frank M. Semple
What boards is Frank M. Semple on?
Frank M. Semple sits on the boards of Marathon Petroleum Corporation and Mplx LP.
How long has Frank M. Semple served on boards?
Our records show at least 8 years of board service across 2 boards, the earliest from 2023.
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