Mark A. Mccollum

Sits on 3 boards. Last updated September 28, 2026

Time on boards

Boards served
3
Current seats
3
Board service
6 years
Director since
2023

6 years of board service in total across 3 boards, counting each seat separately. Longest: Westlake Corporation, 3 years.

3 years ยท Since 2023
Seadrill Limited Director
1 year ยท Since 2025
ONEOK Inc. Director
8 months ยท Since 2026

Shareholder support

Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.

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 8, 2026 Westlake Corporation Option exercise +2,168 โ€” โ€”
May 20, 2026 ONEOK Inc. Grant or award +1,845 $92.15 $170,017
May 14, 2026 Seadrill Limited Option exercise +4,860 โ€” โ€”
Jan 23, 2026 ONEOK Inc. Grant or award +727 $78.00 $56,706
Aug 9, 2025 Westlake Corporation Option exercise +1,128 โ€” โ€”
Apr 17, 2025 Seadrill Limited Option exercise +2,409 โ€” โ€”
Aug 11, 2024 Westlake Corporation Option exercise +1,136 โ€” โ€”
Aug 12, 2023 Westlake Corporation Option exercise +1,446 โ€” โ€”

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