Quick Takeaways
- SELF - Global Self Storage, Inc. has 10 insiders with reported activity on this page.
- Net insider value flow over the last year: +$810,445.
- 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
What Changed
- Buy value: $810,445; sell value: $0.
- Net share flow: +155,465.
Why This Matters
- 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.
Source 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: +$810,445.
Buys
$810,445
Shares: 155,465
Insiders: 6
Sells
$0
Shares: 0
Insiders: 0
Net
+$810,445
Shares: +155,465
Insiders: 6
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 88,753 | 0 | $453,535 | $0 | +$453,535 |
| 6-9 | 35,656 | 0 | $189,639 | $0 | +$189,639 |
| 9-12 | 31,056 | 0 | $167,270 | $0 | +$167,270 |
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 C. Winmill | President and CEO, Director | $1,815,619 | +$140,683 | +8.4% | Market | 24 Mar 2026 |
| TUXIS CORP | Other* | $1,587,074 | +$100,572 | +6.8% | 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 | $194,243 | +$551 | +0.28% | Mixed | 31 Mar 2026 |
| Power William C. Zachary | Director | $91,830 | Mixed | 31 Mar 2026 | ||
| Russell Kamerman | Assistant General Counsel | $29,506 | Market | 24 Mar 2026 | ||
| Sally Coonrad Carroll | Director | $21,258 | +$9,999 | +89% | 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 by the holder's primary source 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 C. Winmill |
13D/G
3/4/5
|
Mark Campbell Winmill · President and CEO, Director |
8.4%
|
947,735
|
$4,605,994 | +$601,950 | 03 Dec 2025 | |
| WINMILL & CO. INC |
13F
3/4/5
|
Company · Other* |
1.3%
from 3/4/5
|
586,500
|
$2,991,150 | — | 31 Dec 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
4.4%
|
494,288
|
$2,520,868 | — | 31 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 | +$100,572 | 15 May 2025 | |
| MARATHON CAPITAL MANAGEMENT |
13F
|
Company |
2.3%
|
261,151
|
$1,331,870 | — | 31 Dec 2025 | |
| BlackRock, Inc. |
13F
|
Company |
2.1%
|
235,683
|
$1,201,984 | — | 31 Dec 2025 | |
| RENAISSANCE TECHNOLOGIES LLC |
13F
|
Company |
1.9%
|
214,825
|
$1,095,608 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
1.3%
|
144,144
|
$735,286 | — | 31 Dec 2025 | |
| 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 | |
| Kestra Advisory Services, LLC |
13F
|
Company |
0.67%
|
75,369
|
$384,382 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
0.59%
|
66,200
|
$337,624 | — | 31 Dec 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
0.54%
|
61,129
|
$311,758 | — | 31 Dec 2025 | |
| EASTERLY INVESTMENT PARTNERS LLC |
13F
|
Company |
0.43%
|
49,061
|
$250,211 | — | 31 Dec 2025 | |
| Towneley Capital Management, Inc / DE |
13F
|
Company |
0.42%
|
47,693
|
$243,235 | — | 31 Dec 2025 | |
| STANSBERRY ASSET MANAGEMENT, LLC |
13F
|
Company |
0.42%
|
47,388
|
$241,679 | — | 31 Dec 2025 | |
| Cetera Investment Advisers |
13F
|
Company |
0.39%
|
44,424
|
$226,561 | — | 31 Dec 2025 | |
| Baker Ellis Asset Management LLC |
13F
|
Company |
0.35%
|
39,000
|
$198,900 | — | 31 Dec 2025 | |
| Power Russell E. Burke |
3/4/5
|
Director |
0.34%
|
38,087
|
$194,243 | +$551 | 31 Mar 2026 | |
| LPL Financial LLC |
13F
|
Company |
0.34%
|
37,914
|
$193,361 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
0.32%
|
36,522
|
$186,262 | — | 31 Dec 2025 | |
| AlphaCentric Advisors LLC |
13F
|
Company |
0.31%
|
35,271
|
$179,882 | — | 31 Dec 2025 | |
| PFG Investments, LLC |
13F
|
Company |
0.31%
|
35,194
|
$179,491 | — | 31 Dec 2025 | |
| Crossingbridge Advisors, LLC |
13F
|
Company |
0.31%
|
35,271
|
$177,766 | — | 31 Dec 2025 | |
| RAYMOND JAMES FINANCIAL INC |
13F
|
Company |
0.3%
|
33,592
|
$171,319 | — | 31 Dec 2025 | |
| STATE STREET CORP |
13F
|
Company |
0.28%
|
31,580
|
$161,058 | — | 31 Dec 2025 | |
| ROYAL BANK OF CANADA |
13F
|
Company |
0.23%
|
25,390
|
$129,000 | — | 31 Dec 2025 | |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC |
13F
|
Company |
0.22%
|
25,184
|
$128,438 | — | 31 Dec 2025 | |
| JAMES INVESTMENT RESEARCH, INC. |
13F
|
Company |
0.21%
|
24,100
|
$122,910 | — | 31 Dec 2025 | |
| NewEdge Advisors, LLC |
13F
|
Company |
0.21%
|
24,100
|
$122,910 | — | 31 Dec 2025 | |
| COMMONWEALTH EQUITY SERVICES, LLC |
13F
|
Company |
0.2%
|
23,059
|
$117,600 | — | 31 Dec 2025 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP |
13F
|
Company |
0.2%
|
22,246
|
$113,455 | — | 31 Dec 2025 | |
| Ethos Financial Group, LLC |
13F
|
Company |
0.19%
|
21,810
|
$111,231 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.19%
|
21,205
|
$108,146 | — | 31 Dec 2025 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
|
Company |
0.18%
|
19,971
|
$102,000 | — | 31 Dec 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.17%
|
19,417
|
$99,027 | — | 31 Dec 2025 | |
| Power William C. Zachary |
3/4/5
|
Director |
0.16%
|
18,006
|
$91,830 | — | 31 Mar 2026 | |
| Man Group plc |
13F
|
Company |
0.14%
|
15,876
|
$80,968 | — | 31 Dec 2025 | |
| RITHOLTZ WEALTH MANAGEMENT |
13F
|
Company |
0.12%
|
13,051
|
$66,558 | — | 31 Dec 2025 | |
| Private Capital Management, LLC |
13F
|
Company |
0.11%
|
12,000
|
$61,200 | — | 31 Dec 2025 | |
| Financial Gravity Asset Management, Inc. |
13F
|
Company |
0.06%
|
6,425
|
$32,768 | — | 31 Dec 2025 | |
| Russell Kamerman |
3/4/5
|
Assistant General Counsel |
0.05%
|
5,925
|
$29,506 | — | 24 Mar 2026 | |
| OSAIC HOLDINGS, INC. |
13F
|
Company |
0.05%
|
5,645
|
$28,793 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.04%
|
4,511
|
$23,006 | — | 31 Dec 2025 | |
| Sally Coonrad Carroll |
3/4/5
|
Director |
0.03%
|
3,776
|
$21,258 | +$9,999 | 21 May 2025 | |
| By Power George B. Langa |
3/4/5
|
Director |
—
class O/S missing
|
3,547
|
$16,241 | — | 28 Nov 2022 | |
| WELLS FARGO & COMPANY/MN |
13F
|
Company |
0.02%
|
2,001
|
$10,206 | — | 31 Dec 2025 | |
| BROADWATER CAPITAL MANAGEMENT LLC |
13F
|
Company |
0.02%
|
2,000
|
$10,200 | — | 31 Dec 2025 | |
| NISA INVESTMENT ADVISORS, LLC |
13F
|
Company |
0.01%
|
1,468
|
$7,487 | — | 31 Dec 2025 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | ||
| Sally Coonrad Carroll | SELF | Common Stock | Purchase | 88.8% | $9,999 | $5.63 | 1,776 | 3,776 | 21 May 2025 | Direct |
| Power William C. Zachary | SELF | Common Stock | Award | 0.7% | 87 | 12,449 | 20 May 2025 | Direct | ||
| Power Russell E. Burke | SELF | Common Stock | Award | 0.25% | 87 | 34,761 | 20 May 2025 | Direct | ||
| Mark Campbell Winmill | SELF | Common Stock | Purchase | 3.2% | $56,700 | $5.67 | 10,000 | 322,838 | 19 May 2025 | Direct |
| Tuxis Corp | SELF | Common Stock | Purchase | 3.26% | $50,158 | $5.22 | 9,600 | 303,758 | 16 May 2025 | Direct |
| Tuxis Corp | SELF | Common Stock | Purchase | 3.4% | $50,413 | $5.21 | 9,680 | 294,158 | 15 May 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.