Mark Campbell Winmill bought $21k of SELF
President and CEO at Global Self Storage, Inc.. 4,000 shares at an average of $5.33, traded May 14, 2026, filed May 15, 2026.
Score components
- +25RoleCEO
- 0Trade size$21k at market
- 0Relative to holdingsHoldings up 1.1%
- 0Price contextNear the top of the 52-week range
- 0ClusterNo other insider buying within 14 days
- 0Repeat buyingFirst buy in 90 days
- 0Track recordToo few past buys to judge (0 with prices)
What happened after comparable buys
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
This signal so far: 1m -2.1%, 3m +2.8%, 6m -.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001019264-26-000003, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| May 14, 2026 | POpen-market purchase Common Stock | +4,000 | $5.33 | $21k | 368,582 | May 15, 2026 |
Related signals
Other insiders at Global Self Storage, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 25Weak | SELFbuy Global Self Storage, Inc. | Mark Campbell Winmill President and CEO | $21k 4,000 shares | +1% | |
| 28Weak | Global Self Storage, Inc. | Winmill & Co. Inc other | $86k 15,308 shares | +7% | |
| 28Weak | Global Self Storage, Inc. | Winmill & Co. Inc other | $84k 15,139 shares | +8% | |
| 27Weak | Global Self Storage, Inc. | Winmill & Co. Inc other | $75k 13,778 shares | +7% | |
| 27Weak | Global Self Storage, Inc. | Winmill & Co. Inc other | $68k 12,853 shares | +7% | |
| 23Weak | Global Self Storage, Inc. | Russell E Burke III director | $8,459 1,625 shares | +4% | |
| 26Weak | Global Self Storage, Inc. | Winmill & Co. Inc other | $61k 11,658 shares | +7% | |
| 32Weak | Global Self Storage, Inc. | Winmill & Co. Inc other | $63k 12,135 shares | +8% | |
| 52Moderate | Global Self Storage, Inc. | Mark Campbell Winmill President and CEO | $84k 16,400 shares | +5% | |
| 35Weak | Global Self Storage, Inc. | Donald Klimoski II General Counsel | $2,252 446 shares | +1% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.