Who owns Global Self Storage Inc, from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).
Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.
Mark Campbell Winmill: 8.4% · 947,735 shares — Thomas Bassett Winmill: 5.2% · 587,600 shares — Winmill Family Trust: 5.2% · 586,500 shares
BARD ASSOCIATES INC: 2.9% · 330,330 shares
Every institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of Global Self Storage Inc they hold. Together these 64 managers report 35.06% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| WINMILL & CO. INC | $3.07M | 586,500 | 0.68% | 5.14% | June 30, 2026 |
| VANGUARD GROUP INC | $2.52M | 494,288 | 0.00% | 4.33% | December 31, 2025 |
62 more institutional holders behind a free account
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Sign up freeFunds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets. Together these 15 funds hold 6.32% of shares outstanding — counted inside the manager totals above, not on top of them, since a fund's shares also appear in its manager's 13F.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| VANGUARD TOTAL STOCK MARKET INDEX FUND | $1.64M | 0.00% | 2.74% | June 30, 2026 |
| VANGUARD EXTENDED MARKET INDEX FUND | $612K | 0.00% | 1.02% | June 30, 2026 |
13 more funds behind a free account
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