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.
Global Self Storage Inc.
Director · President and CEO
Chief executive roles
Global Self Storage Inc.
· President and CEO
Dates unknown
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 |
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