Insider · CIK 0001019264
Mark Campbell Winmill
Files at SELF (Global Self Storage, Inc.). First filing May 20, 2025, latest Sep 11, 2026.
Mark Campbell Winmill files SEC Form 4 as CEO, president and director at SELF (Global Self Storage, Inc.). Since May 20, 2025, Mark Campbell Winmill has reported 4 open-market buys worth $183k and 0 open-market sells worth $0, the latest filed on Sep 11, 2026.
A track record needs three past buys with six months of prices behind them; Mark Campbell Winmill has 1, so none is measured yet.
The newest scored trade: bought $21k of SELF on Sep 9, 2026, filed Sep 11, 2026, scored 25 (weak). In the last 12 months: 3 buys worth $126k and 0 sells worth $0.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
SELF: Global Self Storage, Inc.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 25Weak | SELFbuy Global Self Storage, Inc. | $21k 4,000 shares | +1% | - | |
| 25Weak | SELFbuy Global Self Storage, Inc. | $21k 4,000 shares | +1% | +13% from low-5% from high | |
| 52Moderate | Global Self Storage, Inc. | $84k 16,400 shares | +5% | +10% from low-8% from high | |
| 47Moderate | Global Self Storage, Inc. | $57k 10,000 shares | +3% | +18% from low0% from high |
Transactions
Every row this insider has filed, 14 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 9, 2026 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +1,600 | $5.16 | $8,256 | 370,182 | 32 d ago |
| Sep 9, 2026 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +2,058 | $5.16 | $11k | 372,240 | 32 d ago |
| Sep 10, 2026 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +50 | $5.16 | $258 | 372,290 | 32 d ago |
| Sep 10, 2026 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +292 | $5.16 | $1,507 | 372,582 | 32 d ago |
| May 14, 2026 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +4,000 | $5.33 | $21k | 368,582 | May 15, 2026 |
| Mar 24, 2026 | SELF Global Self Storage, Inc. | AGrant or award Common Stock | +12,672 | $5.08 | $64k | 351,910 | Mar 25, 2026 |
| Mar 24, 2026 | SELF Global Self Storage, Inc. | AGrant or award Common Stock | +12,672 | $5.10 | $65k | 364,582 | Mar 25, 2026 |
| Dec 3, 2025 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +6,000 | $5.13 | $31k | 328,838 | Dec 5, 2025 |
| Dec 4, 2025 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +6,000 | $5.14 | $31k | 334,838 | Dec 5, 2025 |
| Dec 5, 2025 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +800 | $5.05 | $4,040 | 335,638 | Dec 5, 2025 |
| Dec 5, 2025 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +3,600 | $5.09 | $18k | 339,238 | Dec 5, 2025 |
| May 19, 2025 | SELF Global Self Storage, Inc. | POpen-market purchase Common Stock | +10,000 | $5.67 | $57k | 322,838 | May 20, 2025 |
| Mar 25, 2025 | SELF Global Self Storage, Inc. | AGrant or award Common Stock | +12,672 | $5.08 | $64k | 300,166 | Mar 26, 2025 |
| Mar 25, 2025 | SELF Global Self Storage, Inc. | AGrant or award Common Stock | +12,672 | $4.32 | $55k | 312,838 | Mar 26, 2025 |
Questions about Mark Campbell Winmill
Answered from the filings on this page, as of the latest one.
Is Mark Campbell Winmill buying or selling?
In the last 12 months Mark Campbell Winmill reported 3 open-market buys worth $126k and 0 open-market sells worth $0 on SEC Form 4; the latest was bought $21k of SELF on Sep 9, 2026. Grants, option exercises and tax withholding are not counted.
How did Mark Campbell Winmill's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Mark Campbell Winmill has 1.
Where does Mark Campbell Winmill file Form 4?
Mark Campbell Winmill has filed Form 4 at SELF (Global Self Storage, Inc.) as President and CEO. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
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.