Mark Campbell Winmill Insider Trading Activity
Mark Campbell Winmill has been net-buying over the last 12 months with 5 purchases and 0 sales across 1 company.
SELF is the most-traded position with 5 trades. The largest single transaction was a purchase of SELF for $31K on Dec 4, 2025.
Performance Scorecard
Forward stock performance after each transaction by Mark Campbell Winmill. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | -0.3% | — | 25% | 4 |
| 90 days | +1.0% | — | 100% | 4 |
| 120 days | +3.2% | — | 100% | 4 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
Pro: Trade MarkersSELF · Global Self Storage, Inc.
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Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| SELF | Global Self Storage, Inc. | 5 | $105K |
Other insiders at Global Self Storage, Inc.
1 other tracked filer at SELF.