SELF · Insider Trading
Global Self Storage, Inc. Common Stock
Every open-market purchase and sale reported by SELF officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-11 | Mark Campbell Winmill | President and CEO | Buy | +4,000 | +$20.64K |
| 2026-08-26 | WINMILL & CO. INC | — | Buy | +15,308 | +$86.45K |
| 2026-08-24 | WINMILL & CO. INC | — | Buy | +15,139 | +$83.85K |
| 2026-08-20 | WINMILL & CO. INC | — | Buy | +13,778 | +$74.58K |
| 2026-08-18 | WINMILL & CO. INC | — | Buy | +12,853 | +$68.44K |
| 2026-08-14 | Russell E Burke III | Director | Buy | +1,625 | +$8.46K |
| 2026-08-14 | WINMILL & CO. INC | — | Buy | +11,658 | +$60.79K |
| 2026-08-13 | William Chester Zachary | Director | A | +196 | +$1000 |
| 2026-08-13 | Russell E Burke III | Director | A | +196 | +$1000 |
| 2026-08-12 | WINMILL & CO. INC | — | Buy | +12,135 | +$62.60K |
| 2026-05-15 | Mark Campbell Winmill | President and CEO | Buy | +4,000 | +$21.32K |
| 2026-05-14 | William Chester Zachary | Director | A | +94 | +$499 |
| 2026-05-14 | Russell E Burke III | Director | A | +94 | +$499 |
| 2026-04-01 | William Chester Zachary | Director | A | +2,739 | +$14.00K |
| 2026-04-01 | Russell E Burke III | Director | A | +2,739 | +$14.00K |
| 2026-03-25 | Donald Klimoski II | General Counsel | A | +11,054 | +$56.26K |
| 2026-03-25 | Thomas OMalley | Chief Financial Officer | A | +11,054 | +$56.26K |
| 2026-03-25 | Russell Kamerman | Assistant General Counsel | A | +500 | +$2.55K |
| 2026-03-25 | Mark Campbell Winmill | President and CEO | A | +25,344 | +$129.00K |
| 2025-12-05 | Mark Campbell Winmill | President and CEO | Buy | +16,400 | +$83.98K |
| 2025-12-02 | Donald Klimoski II | General Counsel | Buy | +446 | +$2.25K |
| 2025-12-01 | WINMILL & CO. INC | — | Buy | +6,404 | +$33.08K |
| 2025-11-26 | WINMILL & CO. INC | — | Buy | +9,420 | +$48.74K |
| 2025-11-24 | WINMILL & CO. INC | — | Buy | +10,290 | +$52.58K |
| 2025-11-20 | WINMILL & CO. INC | — | Buy | +12,096 | +$61.81K |
| 2025-11-18 | WINMILL & CO. INC | — | Buy | +11,844 | +$60.88K |
| 2025-11-17 | Russell E Burke III | Director | A | +248 | +$1.25K |
| 2025-11-17 | William Chester Zachary | Director | A | +2,584 | +$13.00K |
| 2025-11-14 | WINMILL & CO. INC | — | Buy | +13,729 | +$69.48K |
| 2025-11-12 | WINMILL & CO. INC | — | Buy | +8,124 | +$40.72K |
| 2025-08-29 | WINMILL & CO. INC | — | Buy | +4,592 | +$25.15K |
| 2025-08-28 | WINMILL & CO. INC | — | Buy | +12,686 | +$68.44K |
| 2025-08-26 | Russell E Burke III | Director | Buy | +105 | +$551 |
| 2025-08-26 | WINMILL & CO. INC | — | Buy | +15,611 | +$81.81K |
| 2025-08-22 | WINMILL & CO. INC | — | Buy | +2,662 | +$13.69K |
| 2025-08-20 | Russell E Burke III | Director | A | +146 | +$746 |
| 2025-08-20 | William Chester Zachary | Director | A | +146 | +$746 |
| 2025-06-18 | Russell E Burke III | Director | A | +88 | +$495 |
| 2025-06-18 | William Chester Zachary | Director | A | +88 | +$495 |
| 2025-05-22 | Sally Coonrad Carroll | Director | Buy | +1,776 | +$10.00K |
| 2025-05-21 | Russell E Burke III | Director | A | +87 | +$496 |
| 2025-05-21 | William Chester Zachary | Director | A | +87 | +$496 |
| 2025-05-20 | Mark Campbell Winmill | President and CEO | Buy | +10,000 | +$56.70K |
| 2025-05-19 | TUXIS CORP | — | Buy | +19,280 | +$100.57K |
| 2025-04-01 | Russell E Burke III | Director | A | +2,634 | +$13.25K |
| 2025-04-01 | William Chester Zachary | Director | A | +2,634 | +$13.25K |
| 2025-03-26 | Mark Campbell Winmill | President and CEO | A | +25,344 | +$119.12K |
| 2025-03-26 | Thomas OMalley | Chief Financial Officer | A | +11,054 | +$51.95K |
| 2025-03-26 | Donald Klimoski II | General Counsel | A | +11,054 | +$51.95K |
| 2025-03-26 | Russell Kamerman | Assistant General Counsel | A | +500 | +$2.54K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Mark Campbell Winmill | President and CEO | 372,290 | $1.79M |
| TUXIS CORP | — | 303,758 | $1.46M |
| WINMILL & CO. INC | — | 220,751 | $1.06M |
| Donald Klimoski II | General Counsel | 97,554 | $470.21K |
| Thomas OMalley | Chief Financial Officer | 86,167 | $415.32K |
| Russell E Burke III | Director | 40,002 | $192.81K |
| William Chester Zachary | Director | 18,296 | $88.19K |
| Russell Kamerman | Assistant General Counsel | 5,925 | $28.56K |
| Sally Coonrad Carroll | Director | 3,776 | $18.20K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the SELF quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.