Global Self Storage, Inc.
Global Self Storage, Inc. (SELF) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · SELF · as of Sep 30, 2025
Ownership Breakdown
49
Institutional Holders
▲ 5 vs Q2
$15.27M
Total Inst. Value
▼ $2.25M vs Q2
11.42M
Shares Outstanding
freeFloat 91.84%
3.04M
13F Shares Held
▼ 255,200 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
SELF largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
WINMILL & CO. INC real estate investment trusts | 514.6K | 4.61% | 4.61% | $2.59B | Nov 13, 2025 | ▲ 35.6K |
VANGUARD GROUP INC real estate investment trusts | 513.7K | 4.60% | 4.60% | $2.58B | Nov 7, 2025 | — held |
BARD ASSOCIATES INC real estate investment trusts | 334.0K | 2.99% | 2.99% | $1.68B | Nov 14, 2025 | ▼ 292.3K |
MARATHON CAPITAL MANAGEMENT real estate investment trusts | 296.2K | 2.65% | 2.65% | $1.49B | Nov 14, 2025 | ▼ 37.2K |
RENAISSANCE TECHNOLOGIES LLC real estate investment trusts | 225.9K | 2.02% | 2.02% | $1.14B | Nov 13, 2025 | ▲ 20.9K |
BLACKROCK, INC. real estate investment trusts | 155.0K | 1.39% | 1.39% | $779.60M | Nov 12, 2025 | ▲ 68.2K |
GEODE CAPITAL MANAGEMENT, LLC real estate investment trusts | 141.3K | 1.27% | 1.27% | $710.78M | Nov 12, 2025 | ▲ 1.7K |
STANSBERRY ASSET MANAGEMENT, LLC real estate investment trusts | 85.4K | 76.55% | 76.55% | $429.76M | Nov 14, 2025 | ▲ 1.1K |
KESTRA ADVISORY SERVICES, LLC real estate investment trusts | 73.9K | 66.19% | 66.19% | $371.58M | Nov 14, 2025 | ▲ 63.0K |
MORGAN STANLEY real estate investment trusts | 69.6K | 62.37% | 62.37% | $350.17M | May 27, 2026 | ▲ 1.1K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
19
Increased
+253.5K shares7
New Positions
first time holders14
Decreased
−490.1K shares1
Sold Out
fully exitedNet shares change (top 50)
236.5K
+253.5K / −490.1K
Net new holders
+11
7 new / 1 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
SELF insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
3
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
WINMILL MARK CAMPBELL President and CEO | May 14, 2026 | Purchase | 4,000 | $5.33 | $21.3K | 368.6K | Form 4 ↗ |
BURKE RUSSELL E III director | May 12, 2026 | Award | 94 | $5.31 | $499.14 | 38.2K | Form 4 ↗ |
Zachary William Chester director | May 12, 2026 | Award | 94 | $5.31 | $499.14 | 18.1K | Form 4 ↗ |
BURKE RUSSELL E III director | Mar 31, 2026 | Award | 2,739 | $5.11 | $14.0K | 38.1K | Form 4 ↗ |
Zachary William Chester director | Mar 31, 2026 | Award | 2,739 | $5.11 | $14.0K | 18.0K | Form 4 ↗ |
Kamerman Russell Assistant General Counsel | Mar 24, 2026 | Award | 500 | $5.10 | $2.5K | 5.9K | Form 4 ↗ |
Klimoski Donald II General Counsel | Mar 24, 2026 | Award | 5,527 | $5.10 | $28.2K | 97.6K | Form 4 ↗ |
Klimoski Donald II General Counsel | Mar 24, 2026 | Award | 5,527 | $5.08 | $28.1K | 92.0K | Form 4 ↗ |
OMalley Thomas Chief Financial Officer | Mar 24, 2026 | Award | 5,527 | $5.10 | $28.2K | 91.7K | Form 4 ↗ |
OMalley Thomas Chief Financial Officer | Mar 24, 2026 | Award | 5,527 | $5.08 | $28.1K | 86.2K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Global Self Storage, Inc. (SELF) is primarily owned by institutional investors, who hold approximately 26.6% of total shares outstanding. Company insiders own approximately 8.16%, while retail and public investors account for the remaining 65.26%.
The largest institutional shareholder of Global Self Storage, Inc. is WINMILL & CO. INC, holding approximately 514,593 shares — equal to 4.61% of outstanding shares — as of September 30, 2025.
A total of 49 institutional investors currently hold SELF stock, with a combined institutional value of approximately $15,274,414 as of the most recent 13F filing period.
Frequently asked questions
SELF ownershipGlobal Self Storage, Inc. (SELF) is primarily owned by institutional investors, who hold approximately 26.6% of shares. The largest shareholder is WINMILL & CO. INC with a 4.61% stake. Company insiders hold 8.16%. Data sourced from SEC Form 13F as of September 30, 2025.