Key facts
- SELF - Global Self Storage, Inc. has 10 insiders with reported activity on this page.
- Net insider value flow over the last year: +$664,494.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 10 Insiders of Global Self Storage, Inc.
- Symbol
- SELF on Nasdaq
- Location
- Millbrook, NY
Change
- Buy value: $664,494; sell value: $0.
- Net share flow: +128,409.
Research use
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to buying over the last 12 months. Net value: +$664,494.
Buys
$664,494
Shares: 128,409
Insiders: 4
Sells
$0
Shares: 0
Insiders: 0
Net
+$664,494
Shares: +128,409
Insiders: 4
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 4,000 | 0 | $21,320 | $0 | +$21,320 |
| 3-6 | 32,670 | 0 | $168,059 | $0 | +$168,059 |
| 6-9 | 89,077 | 0 | $461,422 | $0 | +$461,422 |
| 9-12 | 2,662 | 0 | $13,693 | $0 | +$13,693 |
Global Self Storage, Inc. executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mark Campbell Winmill | President and CEO, Director | $1,964,543 | +$105,303 | +5.7% | Filing P/S | 14 May 2026 |
| TUXIS CORP | Other* | $1,587,074 | Filing P/S | 15 May 2025 | ||
| WINMILL & CO. INC | Other* | $764,396 | +$556,388 | +267% | Filing P/S | 28 Nov 2025 |
| Donald Klimoski II | General Counsel | $497,525 | +$2,252 | +0.45% | Mixed | 24 Mar 2026 |
| Thomas OMalley | Chief Financial Officer | $467,639 | Mixed | 24 Mar 2026 | ||
| Power Russell E. Burke | Director | $195,104 | +$551 | +0.28% | Median | 12 May 2026 |
| Power William C. Zachary | Director | $92,491 | Median | 12 May 2026 | ||
| Russell Kamerman | Assistant General Counsel | $29,506 | Mixed | 24 Mar 2026 | ||
| Sally Coonrad Carroll | Director | $21,258 | Filing P/S | 21 May 2025 | ||
| By Power George B. Langa | Director | $16,241 | Mixed | 28 Nov 2022 |
Top shareholders of Global Self Storage, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Mark Campbell Winmill |
13D/G
3/4/5
|
President and CEO, Director |
8.4%
|
947,735
|
$4,605,994 | +$601,950 | 03 Dec 2025 | |
| BARD ASSOCIATES INC |
13D/G
13F
|
Company |
2.9%
|
330,330
|
$1,661,560 | $0 | 13 Aug 2025 | |
| TUXIS CORP |
3/4/5
|
Other* |
2.7%
|
303,758
|
$1,587,074 | — | 15 May 2025 | |
| WINMILL & CO. INC |
13F
3/4/5
|
Company · Other* |
1.3%
from 3/4/5
|
586,500
|
$2,997,015 | — | 31 Mar 2026 | |
| Donald Klimoski II |
3/4/5
|
General Counsel |
0.86%
|
97,554
|
$497,525 | +$2,252 | 24 Mar 2026 | |
| Thomas OMalley |
3/4/5
|
Chief Financial Officer |
0.81%
|
91,694
|
$467,639 | — | 24 Mar 2026 | |
| Power Russell E. Burke |
3/4/5
|
Director |
0.34%
|
38,181
|
$195,104 | +$551 | 12 May 2026 | |
| Power William C. Zachary |
3/4/5
|
Director |
0.16%
|
18,100
|
$92,491 | — | 12 May 2026 | |
| Russell Kamerman |
3/4/5
|
Assistant General Counsel |
0.05%
|
5,925
|
$29,506 | — | 24 Mar 2026 | |
| Sally Coonrad Carroll |
3/4/5
|
Director |
0.03%
|
3,776
|
$21,258 | — | 21 May 2025 | |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
|
Company |
3.8%
|
430,003
|
$2,197,315 | — | 31 Mar 2026 | |
| BlackRock, Inc. |
13F
|
Company |
2.6%
|
294,640
|
$1,505,609 | — | 31 Mar 2026 | |
| MARATHON CAPITAL MANAGEMENT |
13F
|
Company |
2.3%
|
259,627
|
$1,326,696 | — | 31 Mar 2026 | |
| RENAISSANCE TECHNOLOGIES LLC |
13F
|
Company |
1.9%
|
216,175
|
$1,104,654 | — | 31 Mar 2026 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
1.3%
|
144,262
|
$737,338 | — | 31 Mar 2026 | |
| WELLS FARGO & COMPANY/MN |
13F
|
Company |
1.2%
|
130,919
|
$668,994 | — | 31 Mar 2026 | |
| Private Capital Management, LLC |
13F
|
Company |
0.92%
|
103,549
|
$529,135 | — | 31 Mar 2026 | |
| MORGAN STANLEY |
13F
|
Company |
0.65%
|
73,114
|
$373,617 | — | 31 Mar 2026 | |
| Kestra Advisory Services, LLC |
13F
|
Company |
0.56%
|
63,120
|
$322,543 | — | 31 Mar 2026 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
0.54%
|
61,129
|
$312,370 | — | 31 Mar 2026 | |
| VANGUARD FIDUCIARY TRUST CO |
13F
|
Company |
0.53%
|
60,231
|
$307,780 | — | 31 Mar 2026 | |
| Towneley Capital Management, Inc / DE |
13F
|
Company |
0.43%
|
48,375
|
$247,198 | — | 31 Mar 2026 | |
| Cetera Investment Advisers |
13F
|
Company |
0.38%
|
43,435
|
$221,952 | — | 31 Mar 2026 | |
| RAYMOND JAMES FINANCIAL INC |
13F
|
Company |
0.36%
|
40,938
|
$209,191 | — | 31 Mar 2026 | |
| PFG Investments, LLC |
13F
|
Company |
0.31%
|
35,402
|
$180,905 | — | 31 Mar 2026 | |
| AlphaCentric Advisors LLC |
13F
|
Company |
0.31%
|
35,271
|
$180,235 | — | 31 Mar 2026 | |
| Crossingbridge Advisors, LLC |
13F
|
Company |
0.31%
|
35,271
|
$180,235 | — | 31 Mar 2026 | |
| Baker Ellis Asset Management LLC |
13F
|
Company |
0.31%
|
35,000
|
$178,850 | — | 31 Mar 2026 | |
| STATE STREET CORP |
13F
|
Company |
0.28%
|
31,580
|
$161,374 | — | 31 Mar 2026 | |
| WealthTrust Axiom LLC |
13F
|
Company |
0.27%
|
31,000
|
$158,410 | — | 31 Mar 2026 | |
| LPL Financial LLC |
13F
|
Company |
0.25%
|
27,969
|
$142,921 | — | 31 Mar 2026 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.24%
|
26,541
|
$135,625 | — | 31 Mar 2026 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.22%
|
25,382
|
$129,702 | — | 31 Mar 2026 | |
| Man Group plc |
13F
|
Company |
0.22%
|
24,959
|
$127,540 | — | 31 Mar 2026 | |
| JAMES INVESTMENT RESEARCH, INC. |
13F
|
Company |
0.21%
|
24,100
|
$123,151 | — | 31 Mar 2026 | |
| NewEdge Advisors, LLC |
13F
|
Company |
0.21%
|
24,100
|
$24,100 | — | 31 Mar 2026 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP |
13F
|
Company |
0.21%
|
23,779
|
$121,511 | — | 31 Mar 2026 | |
| UBS Group AG |
13F
|
Company |
0.2%
|
22,570
|
$115,333 | — | 31 Mar 2026 | |
| Ethos Financial Group, LLC |
13F
|
Company |
0.19%
|
21,810
|
$111,231 | — | 31 Mar 2026 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
|
Company |
0.18%
|
19,971
|
$103,000 | — | 31 Mar 2026 | |
| Merit Financial Group, LLC |
13F
|
Company |
0.16%
|
17,975
|
$91,855 | — | 31 Mar 2026 | |
| HSBC HOLDINGS PLC |
13F
|
Company |
0.15%
|
17,271
|
$87,909 | — | 31 Mar 2026 | |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC |
13F
|
Company |
0.14%
|
15,720
|
$80,329 | — | 31 Mar 2026 | |
| RITHOLTZ WEALTH MANAGEMENT |
13F
|
Company |
0.1%
|
10,907
|
$55,737 | — | 31 Mar 2026 | |
| BARCLAYS PLC |
13F
|
Company |
0.09%
|
10,529
|
$53,803 | — | 31 Mar 2026 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
0.07%
|
7,611
|
$38,283 | — | 31 Mar 2026 | |
| SIMPLEX TRADING, LLC |
13F
|
Company |
0.06%
|
6,618
|
$33,817 | — | 31 Mar 2026 | |
| Financial Gravity Asset Management, Inc. |
13F
|
Company |
0.06%
|
6,425
|
$32,832 | — | 31 Mar 2026 | |
| OSAIC HOLDINGS, INC. |
13F
|
Company |
0.05%
|
5,686
|
$29,056 | — | 31 Mar 2026 | |
| CITIGROUP INC |
13F
|
Company |
0.05%
|
5,629
|
$28,764 | — | 31 Mar 2026 |
Recent Insider Transactions by Companies or Individuals for Global Self Storage, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Mark Campbell Winmill | SELF | Common Stock | Purchase | 1.1% | $21,320 | $5.33 | 4,000 | 368,582 | 14 May 2026 | Direct |
| Power Russell E. Burke | SELF | Common Stock | Award | 0.25% | 94 | 38,181 | 12 May 2026 | Direct | ||
| Power William C. Zachary | SELF | Common Stock | Award | 0.52% | 94 | 18,100 | 12 May 2026 | Direct | ||
| Power Russell E. Burke | SELF | Common Stock | Award | 7.75% | 2,739 | 38,087 | 31 Mar 2026 | Direct | ||
| Power William C. Zachary | SELF | Common Stock | Award | 17.9% | 2,739 | 18,006 | 31 Mar 2026 | Direct | ||
| Russell Kamerman | SELF | Common Stock | Award | 9.22% | 500 | 5,925 | 24 Mar 2026 | Direct | ||
| Donald Klimoski II | SELF | Common Stock | Award | 12.8% | 11,054 | 97,554 | 24 Mar 2026 | Direct | ||
| Thomas OMalley | SELF | Common Stock | Award | 13.7% | 11,054 | 91,694 | 24 Mar 2026 | Direct | ||
| Mark C. Winmill | SELF | Common Stock | Award | 7.47% | 25,344 | 364,582 | 24 Mar 2026 | Direct | ||
| Mark Campbell Winmill | SELF | Common Stock | Purchase | 1.31% | $22,364 | $5.08 | 4,400 | 339,238 | 05 Dec 2025 | Direct |
| Mark Campbell Winmill | SELF | Common Stock | Purchase | 1.82% | $30,849 | $5.14 | 6,000 | 334,838 | 04 Dec 2025 | Direct |
| Mark Campbell Winmill | SELF | Common Stock | Purchase | 1.86% | $30,770 | $5.13 | 6,000 | 328,838 | 03 Dec 2025 | Direct |
| Donald Klimoski II | SELF | Common Stock | Purchase | 0.52% | $2,252 | $5.05 | 446 | 86,500 | 02 Dec 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 2.12% | $15,853 | $5.18 | 3,062 | 147,641 | 01 Dec 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 2.37% | $17,229 | $5.16 | 3,342 | 144,579 | 28 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 3.57% | $25,175 | $5.17 | 4,873 | 141,237 | 26 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 3.45% | $23,567 | $5.18 | 4,547 | 136,364 | 25 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 3.18% | $20,904 | $5.14 | 4,064 | 131,817 | 24 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 5.12% | $31,673 | $5.09 | 6,226 | 127,753 | 21 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 5.08% | $29,842 | $5.08 | 5,870 | 121,527 | 20 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 5.69% | $31,970 | $5.13 | 6,226 | 115,657 | 19 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 5.41% | $28,977 | $5.16 | 5,618 | 109,431 | 18 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 6.38% | $31,906 | $5.12 | 6,226 | 103,813 | 17 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 7.77% | $35,838 | $5.09 | 7,035 | 97,587 | 14 Nov 2025 | Direct |
| Power Russell E. Burke | SELF | Common Stock | Award | 0.71% | 248 | 35,348 | 13 Nov 2025 | Direct | ||
| Power William C. Zachary | SELF | Common Stock | Award | 20.4% | 2,584 | 15,267 | 13 Nov 2025 | Direct | ||
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 7.98% | $33,645 | $5.03 | 6,694 | 90,552 | 13 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 7.78% | $30,438 | $5.03 | 6,055 | 83,858 | 12 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 2.73% | $10,283 | $4.97 | 2,069 | 77,803 | 11 Nov 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 6.45% | $25,150 | $5.48 | 4,592 | 75,734 | 29 Aug 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 11.3% | $39,093 | $5.42 | 7,209 | 71,142 | 28 Aug 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 9.37% | $29,345 | $5.36 | 5,477 | 63,933 | 27 Aug 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 15.4% | $40,973 | $5.26 | 7,788 | 58,456 | 26 Aug 2025 | Direct |
| Power Russell E. Burke | SELF | Common Stock | Purchase | 0.3% | $551 | $5.24 | 105 | 35,100 | 25 Aug 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 18.3% | $40,834 | $5.22 | 7,823 | 50,668 | 25 Aug 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 5.31% | $11,122 | $5.15 | 2,160 | 42,845 | 22 Aug 2025 | Direct |
| Winmill & Co. Inc | SELF | Common Stock | Purchase | 1.25% | $2,570 | $5.12 | 502 | 40,685 | 21 Aug 2025 | Direct |
| Power William C. Zachary | SELF | Common Stock | Award | 1.16% | 146 | 12,683 | 19 Aug 2025 | Direct | ||
| Power Russell E. Burke | SELF | Common Stock | Award | 0.42% | 146 | 34,995 | 19 Aug 2025 | Direct | ||
| Power Russell E. Burke | SELF | Common Stock | Award | 0.25% | 88 | 34,849 | 17 Jun 2025 | Direct | ||
| Power William C. Zachary | SELF | Common Stock | Award | 0.71% | 88 | 12,537 | 17 Jun 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.