Winmill Mark Campbell, President and CEO of Global Self Storage, Inc. ($SELF), bought shares on the open market five times in the last year, totaling about $141,000. His latest purchase occurred on December 5, 2025. These insider buys rank 1,875th among nearly 5,000 individuals, below the average of $1.46 million across 3.29 transactions per insider. He reported no open market sales.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 24, 2026 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | A | Common Stock | 12672 | $5.08 | 351,910.2890 | 11,337,720 | 3.74% | 0.11% |
| March 24, 2026 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | A | Common Stock | 12672 | $5.10 | 364,582.2890 | 11,337,720 | 3.60% | 0.11% |
| Dec. 5, 2025 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 3600 | $5.09 | 339,238.2890 | 11,337,720 | 1.07% | 0.03% |
| Dec. 5, 2025 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 800 | $5.05 | 335,638.2890 | 11,337,720 | 0.24% | 0.01% |
| Dec. 4, 2025 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 6000 | $5.14 | 334,838.2890 | 11,337,720 | 1.82% | 0.05% |
| Dec. 3, 2025 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 6000 | $5.13 | 328,838.2890 | 11,337,720 | 1.86% | 0.05% |
| May 19, 2025 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 10000 | $5.67 | 322,838.2890 | 11,338,391 | 3.20% | 0.09% |
| March 25, 2025 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | A | Common Stock | 12672 | $4.32 | 312,838.2890 | 11,292,772 | 4.22% | 0.11% |
| March 25, 2025 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | A | Common Stock | 12672 | $5.08 | 300,166.2890 | 11,292,772 | 4.41% | 0.11% |
| May 30, 2024 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 20000 | $4.97 | 287,494.2890 | 11,267,048 | 7.48% | 0.18% |
| May 28, 2024 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 100 | $4.90 | 267,494.2890 | 11,267,048 | 0.04% | 0.00% |
| May 28, 2024 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 375 | $4.91 | 267,394.2890 | 11,267,048 | 0.14% | 0.00% |
| May 28, 2024 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 24 | $4.91 | 267,019.2890 | 11,267,048 | 0.01% | 0.00% |
| May 28, 2024 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 2400 | $4.90 | 266,995.2890 | 11,267,048 | 0.91% | 0.02% |
| March 25, 2024 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | A | Common Stock | 38054 | $4.32 | 264,595.2890 | 11,153,513 | 16.80% | 0.34% |
| March 25, 2024 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | A | Common Stock | 12672 | $4.32 | 223,074.2890 | 11,153,513 | 6.02% | 0.11% |
| March 25, 2024 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | A | Common Stock | 3467 | $4.32 | 226,541.2890 | 11,153,513 | 1.55% | 0.03% |
| Nov. 16, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 2000 | $4.87 | 208,402.2890 | 11,109,077 | 0.97% | 0.02% |
| Nov. 16, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 1000 | $4.81 | 209,402.2890 | 11,109,077 | 0.48% | 0.01% |
| Nov. 16, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 1000 | $4.84 | 210,402.2890 | 11,109,077 | 0.48% | 0.01% |
| Nov. 16, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 1200 | $4.82 | 204,402.2890 | 11,109,077 | 0.59% | 0.01% |
| Nov. 16, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 489 | $4.81 | 204,891.2890 | 11,109,077 | 0.24% | 0.00% |
| Nov. 16, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 1511 | $4.81 | 206,402.2890 | 11,109,077 | 0.74% | 0.01% |
| Aug. 17, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 1000 | $5.07 | 203,202.2890 | 11,109,077 | 0.49% | 0.01% |
| May 15, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 1500 | $5.10 | 200,402.2890 | 11,109,077 | 0.75% | 0.01% |
| May 15, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 1800 | $5.13 | 202,202.2890 | 11,109,077 | 0.90% | 0.02% |
| May 15, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 200 | $5.13 | 197,602.2890 | 11,109,077 | 0.10% | 0.00% |
| May 15, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 655 | $5.15 | 197,402.2890 | 11,109,077 | 0.33% | 0.01% |
| May 15, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 1300 | $5.15 | 198,902.2890 | 11,109,077 | 0.66% | 0.01% |
| May 15, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 745 | $5.10 | 196,647.2890 | 11,109,077 | 0.38% | 0.01% |
| May 15, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 1500 | $5.10 | 195,902.2890 | 11,109,077 | 0.77% | 0.01% |
| May 15, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | P | Common Stock | 100 | $5.13 | 196,747.2890 | 11,109,077 | 0.05% | 0.00% |
| March 27, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | A | Common Stock | 2093 | $5.52 | 194,402.2890 | 11,109,077 | 1.09% | 0.02% |
| March 27, 2023 | Global Self Storage, Inc. | $SELF | WINMILL MARK CAMPBELL | President and CEO | A | Common Stock | 12672 | $5.11 | 192,309.2890 | 11,109,077 | 7.05% | 0.11% |