Mark Campbell Winmill insider trades: Global Self Storage (SELF) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Mark reports to the SEC
Open-market buys and sales
34 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Sep 10, 2026 | SELF | ↑ Buy | 4,000 | $5.16 | $21K | Direct | Sep 11, 2026 (1d) |
| May 14, 2026 | SELF | ↑ Buy | 4,000 | $5.33 | $21K | Direct | May 15, 2026 (1d) |
| Dec 5, 2025 | SELF | ↑ Buy | 16,400 | $5.12 | $84K | Direct | Dec 5, 2025 (0d) |
| May 19, 2025 | SELF | ↑ Buy | 10,000 | $5.67 | $57K | Direct | May 20, 2025 (1d) |
| May 30, 2024 | SELF | ↑ Buy | 22,899 | $4.96 | $114K | Direct | May 30, 2024 (0d) |
| Nov 16, 2023 | SELF | ↑ Buy | 7,200 | $4.83 | $35K | Direct | Nov 17, 2023 (1d) |
| Aug 17, 2023 | SELF | ↑ Buy | 1,000 | $5.07 | $5K | Direct | Aug 18, 2023 (1d) |
| May 15, 2023 | SELF | ↑ Buy | 7,800 | $5.12 | $40K | Direct | May 16, 2023 (1d) |
| Nov 18, 2022 | SELF | ↑ Buy | 3,000 | $5.18 | $16K | Direct | Nov 21, 2022 (3d) |
| Aug 23, 2022 | SELF | ↑ Buy | 4,800 | $6.07 | $29K | Direct | Aug 24, 2022 (1d) |
| May 20, 2022 | SELF | ↑ Buy | 1,700 | $5.74 | $10K | Direct | May 23, 2022 (3d) |
| Aug 24, 2021 | SELF | ↑ Buy | 1,000 | $5.12 | $5K | Direct | Aug 25, 2021 (1d) |
| Aug 20, 2021 | SELF | ↑ Buy | 4,000 | $5.10 | $20K | Direct | Aug 24, 2021 (4d) |
| Nov 20, 2020 | SELF | ↑ Buy | 10,000 | $4.00 | $40K | Direct | Nov 23, 2020 (3d) |
| Aug 19, 2020 | SELF | ↑ Buy | 7,000 | $3.91 | $27K | Direct | Aug 21, 2020 (2d) |
| May 20, 2020 | SELF | ↑ Buy | 3,550 | $3.73 | $13K | Direct | May 21, 2020 (1d) |
| May 28, 2019 | SELF | ↑ Buy | 2,000 | $3.70 | $7K | Direct | May 29, 2019 (1d) |
| May 18, 2018 | SELF | ↑ Buy | 1,400 | $4.18 | $6K | Direct | May 21, 2018 (3d) |
| Aug 23, 2017 | SELF | ↑ Buy | 3,000 | $4.89 | $15K | Direct | Aug 24, 2017 (1d) |
| Nov 30, 2016 | SELF | ↑ Buy | 1,000 | $5.00 | $5K | Direct | Dec 1, 2016 (1d) |
| Aug 23, 2016 | SELF | ↑ Buy | 2,000 | $5.50 | $11K | Direct | Aug 26, 2016 (3d) |
| May 26, 2016 | SELF | ↑ Buy | 190 | $4.83 | $918 | Direct | May 27, 2016 (1d) |
| May 25, 2016 | SELF | ↑ Buy | 200 | $4.77 | $954 | Direct | May 26, 2016 (1d) |
| May 24, 2016 | SELF | ↑ Buy | 6,829 | $4.70 | $32K | Direct | May 25, 2016 (1d) |
| Mar 27, 2012 | GIFD | ↑ Buy | 10,000 | $4.07 | $41K | Direct | Mar 28, 2012 (1d) |
| Mar 16, 2012 | GIFD | ↑ Buy | 1,841 | $4.05 | $7K | Direct | Mar 19, 2012 (3d) |
| Mar 9, 2012 | GIFD | ↑ Buy | 2,400 | $4.00 | $10K | Direct | Mar 13, 2012 (4d) |
| Mar 7, 2012 | GIFD | ↑ Buy | 5,000 | $4.00 | $20K | Direct | Mar 9, 2012 (2d) |
| Sep 19, 2007 | BXL | ↓ Sell | 1,750 | $30.99 | $54K | Direct | Sep 21, 2007 (2d) |
| Feb 12, 2007 | BXL | ↓ Sell | 250 | $33.05 | $8K | Direct | May 15, 2007 (92d) |
| Nov 2, 2006 | TUX | ↑ Buy | 1,100 | $6.02 | $7K | Direct | Nov 3, 2006 (1d) |
| Oct 3, 2006 | BXL | ↓ Sell | 500 | $26.00 | $13K | Direct | Oct 4, 2006 (1d) |
| Mar 23, 2006 | TUX | ↑ Buy | 2,000 | $6.63 | $13K | Direct | Mar 27, 2006 (4d) |
| Mar 17, 2006 | TUX | ↑ Buy | 3,000 | $6.50 | $20K | Direct | Mar 21, 2006 (4d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other SELF insiders
Open-market trades in the last 12 months
About Mark Campbell Winmill's insider trades
Mark Campbell Winmill is President and CEO at Global Self Storage (SELF). Since Mar 17, 2006, Mark has reported 31 open-market purchases worth $732K and 3 sales worth $75K on SEC Form 4. In the last 12 months: 3 buys ($126K).
Their filings also include grants and awards (10 filings), shares returned to the company (1 filing), inherited shares (1 filing), option exercises (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every SELF insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.