Time on boards
- Boards served
- 4
- Current seats
- 4
- Board service
- 10 years
- Director since
- 2023
10 years of board service in total across 4 boards, counting each seat separately. Longest: Owens Corning Inc, 3 years.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
Prudential Financial Inc. May 12, 202696.0%
-
Marathon Petroleum Corporation April 29, 202694.9%
-
Owens Corning Inc April 15, 202597.4%
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 3, 2026 | Marathon Petroleum Corporation | Shares withheld for tax | −908 | $311.78 | $283,096 |
| Apr 9, 2026 | Owens Corning Inc | Grant or award | +163 | $114.95 | $18,738 |
| Mar 2, 2026 | Mplx LP | Shares withheld for tax | −3,407 | $59.22 | $201,763 |
| Mar 2, 2026 | Marathon Petroleum Corporation | Shares withheld for tax | −952 | $206.30 | $196,398 |
| Mar 2, 2026 | Mplx LP | Shares withheld for tax | −3,404 | $59.22 | $201,585 |
| Mar 2, 2026 | Marathon Petroleum Corporation | Shares withheld for tax | −778 | $206.30 | $160,501 |
| Mar 2, 2026 | Mplx LP | Shares withheld for tax | −6,409 | $59.22 | $379,541 |
| Mar 2, 2026 | Marathon Petroleum Corporation | Shares withheld for tax | −2,236 | $206.30 | $461,287 |
| Mar 1, 2026 | Mplx LP | Grant or award | +52,817 | — | — |
| Mar 1, 2026 | Marathon Petroleum Corporation | Grant or award | +15,266 | — | — |
| Feb 27, 2026 | Owens Corning Inc | Grant or award | +412 | $122.07 | $50,293 |
| Jan 21, 2026 | Owens Corning Inc | Grant or award | +147 | $124.68 | $18,297 |
| Nov 7, 2025 | Owens Corning Inc | Grant or award | +439 | $104.20 | $45,744 |
| Nov 6, 2025 | Owens Corning Inc | Grant or award | +159 | $104.94 | $16,658 |
| Aug 8, 2025 | Owens Corning Inc | Grant or award | +318 | $143.88 | $45,754 |
Questions about Maryann T. Mannen
What boards is Maryann T. Mannen on?
Maryann T. Mannen sits on the boards of Marathon Petroleum Corporation, Mplx LP, Owens Corning Inc and Prudential Financial Inc.
What company is Maryann T. Mannen the CEO of?
Maryann T. Mannen is President & CEO of Marathon Petroleum Corporation and Maryann T. Mannen is President & CEO of Mplx LP.
How long has Maryann T. Mannen served on boards?
Our records show at least 10 years of board service across 4 boards, the earliest from 2023.
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