Mark Campbell Winmill
President and CEO at Global Self Storage Inc.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 4 years
- Director since
- 2023
4 years of board service in total across 1 board, counting each seat separately. Longest: Global Self Storage Inc., 3 years.
Chief executive roles
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 |
|---|---|---|---|---|---|
| Sep 10, 2026 | Global Self Storage Inc. | Open-market purchase | +50 | $5.16 | $258 |
| Sep 10, 2026 | Global Self Storage Inc. | Open-market purchase | +292 | $5.16 | $1,507 |
| Sep 9, 2026 | Global Self Storage Inc. | Open-market purchase | +1,600 | $5.16 | $8,256 |
| Sep 9, 2026 | Global Self Storage Inc. | Open-market purchase | +2,058 | $5.16 | $10,619 |
| May 14, 2026 | Global Self Storage Inc. | Open-market purchase | +4,000 | $5.33 | $21,320 |
| Mar 24, 2026 | Global Self Storage Inc. | Grant or award | +12,672 | $5.08 | $64,374 |
| Mar 24, 2026 | Global Self Storage Inc. | Grant or award | +12,672 | $5.10 | $64,627 |
| Dec 5, 2025 | Global Self Storage Inc. | Open-market purchase | +800 | $5.05 | $4,040 |
| Dec 5, 2025 | Global Self Storage Inc. | Open-market purchase | +3,600 | $5.09 | $18,324 |
| Dec 4, 2025 | Global Self Storage Inc. | Open-market purchase | +6,000 | $5.14 | $30,840 |
| Dec 3, 2025 | Global Self Storage Inc. | Open-market purchase | +6,000 | $5.13 | $30,780 |
| May 19, 2025 | Global Self Storage Inc. | Open-market purchase | +10,000 | $5.67 | $56,700 |
| Mar 25, 2025 | Global Self Storage Inc. | Grant or award | +12,672 | $5.08 | $64,374 |
| Mar 25, 2025 | Global Self Storage Inc. | Grant or award | +12,672 | $4.32 | $54,743 |
| May 30, 2024 | Global Self Storage Inc. | Open-market purchase | +20,000 | $4.97 | $99,400 |
Questions about Mark Campbell Winmill
What boards is Mark Campbell Winmill on?
Mark Campbell Winmill sits on the board of Global Self Storage Inc.
What company is Mark Campbell Winmill the CEO of?
Mark Campbell Winmill is President and CEO of Global Self Storage Inc.
How long has Mark Campbell Winmill served on boards?
Our records show at least 4 years of board service across 1 board, the earliest from 2023.
Reviews (0)
Sign in to write a review.
No reviews yet. Be the first to write one.