Vault-13

GLOBAL SELF STORAGE INC SELF

COM · REIT · CUSIP 37955N106

51 institutional holders -5 vs Q1 2026
3,349,5343.3m shares reported held*
29.3% of all shares outstanding*
$17.5mreported value*
1 new 24 added 13 reduced 6 sold out net bought ≈ $1.1m (+210.6k shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 11.4m as of 2026-08-06, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $5.24. Options: 2 managers hold calls ($536.1k notional), 1 hold puts ($60.3k).

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0204060Q3 22: 41Q4 22: 46Q1 23: 46Q2 23: 45Q3 23: 45Q4 23: 46Q1 24: 45Q2 24: 43Q3 24: 42Q4 24: 45Q1 25: 47Q2 25: 46Q3 25: 51Q4 25: 49Q1 26: 56Q2 26: 5151Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 202241
Q4 202246
Q1 202346
Q2 202345
Q3 202345
Q4 202346
Q1 202445
Q2 202443
Q3 202442
Q4 202445
Q1 202547
Q2 202546
Q3 202551
Q4 202549
Q1 202656
Q2 202651

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
40040Q3 24: 14 bought or addedQ3 24: 14 cut or sold outQ4 24: 18 bought or addedQ4 24: 15 cut or sold outQ4 24Q1 25: 16 bought or addedQ1 25: 17 cut or sold outQ2 25: 21 bought or addedQ2 25: 19 cut or sold outQ2 25Q3 25: 26 bought or addedQ3 25: 17 cut or sold outQ4 25: 20 bought or addedQ4 25: 25 cut or sold outQ4 25Q1 26: 27 bought or addedQ1 26: 18 cut or sold outQ2 26: 25 bought or addedQ2 26: 19 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 20241414
Q4 20241815
Q1 20251617
Q2 20252119
Q3 20252617
Q4 20252025
Q1 20262718
Q2 20262519

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$200k$400k$600kQ3 25 calls: $0Q3 25 puts: $0Q3 25P/C —Q4 25 calls: $0Q4 25 puts: $509Q4 25P/C —Q1 26 calls: $0Q1 26 puts: $55.2kQ1 26P/C —Q2 26 calls: $536.1kQ2 26 puts: $60.3kQ2 26P/C 0.11
Numbers
QuarterCallsPutsP/C
Q3 2025$0$0—
Q4 2025$0$509—
Q1 2026$0$55.2k—
Q2 2026$536.1k$60.3k0.11

Biggest buyers

Private Capital Management, LLC Added +119,788+119.8k
BlackRock, Inc. Added +102,855+102.9k
CITADEL ADVISORS LLC New +27,614+27.6k
GOLDMAN SACHS GROUP INC Added +9,730+9.7k
JPMORGAN CHASE & CO Added +5,866+5.9k
Merit Financial Group, LLC Added +5,322+5.3k
RAYMOND JAMES FINANCIAL INC Added +5,091+5.1k
MORGAN STANLEY Added +4,689+4.7k
VANGUARD CAPITAL MANAGEMENT LLC Added +4,488+4.5k
Kestra Advisory Services, LLC Added +4,047+4.0k

Biggest sellers

SUSQUEHANNA INTERNATIONAL GROUP, LLP Sold out -23,779-23.8k
RENAISSANCE TECHNOLOGIES LLC Reduced -18,100-18.1k
Cetera Investment Advisers Reduced -14,983-15.0k
CITIGROUP INC Reduced -5,489-5.5k
AlphaCentric Advisors LLC Reduced -5,271-5.3k
Crossingbridge Advisors, LLC Reduced -5,271-5.3k
Advisory Services Network, LLC Sold out -3,732-3.7k
DIMENSIONAL FUND ADVISORS LP Reduced -3,233-3.2k
Ethos Financial Group, LLC Reduced -2,635-2.6k
SIMPLEX TRADING, LLC Reduced -2,005-2.0k

Biggest calls

SUSQUEHANNA INTERNATIONAL GROUP, LLP New $325.9k62.2k shares
JANE STREET GROUP, LLC New $210.1k40.1k shares

Biggest puts

SIMPLEX TRADING, LLC Added $60.3k11.5k shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
WINMILL MARK CAMPBELL 13D · may seek influence +1.1 pts · filed 2025-12-05
Stated purposeThe Reporting Persons acquired the Shares for investment purposes. Notwithstanding any of the foregoing, the Reporting Persons may at any time modify, change, abandon, or replace, some or all of the foregoing purposes and plans and discussions relating thereto or discontinue or re-continue such modifications, changes, abandonments, or replacements at any time. Full filing
8.4% +1.1 pts 947.7k≈ $5.0m 2025-12-05

Insider purchases and sales since 1 Apr 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
202Q4 24: 1 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25Q2 25: 2 buyingQ2 25: 0 sellingQ3 25: 1 buyingQ3 25: 0 sellingQ3 25Q4 25: 2 buyingQ4 25: 0 sellingQ1 26: 0 buyingQ1 26: 0 sellingQ1 26Q2 26: 1 buyingQ2 26: 0 sellingQ3 26: 2 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20241$8840——
Q1 20250—0——
Q2 20252$66.7k0——
Q3 20251$5510——
Q4 20252$86.2k0——
Q1 20260—0——
Q2 20261$21.3k0——
Q3 20262$29.1k0——
DateInsiderTradeSharesPrice ValueTheir holding
2026-09-10 WINMILL MARK CAMPBELL President and CEO, director Bought 342 $5.16 $1.8k342 shares +<1%
2026-09-09 WINMILL MARK CAMPBELL President and CEO, director Bought 3,658 $5.16 $18.9k3.7k shares +1%
2026-08-26 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 7,761 $5.64 $43.8k7.8k shares +4%
2026-08-25 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 7,547 $5.66 $42.7k7.5k shares +4%
2026-08-24 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 8,022 $5.62 $45.1k8.0k shares +4%
2026-08-21 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 7,117 $5.45 $38.8k7.1k shares +4%
2026-08-20 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 6,901 $5.42 $37.4k6.9k shares +4%
2026-08-19 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 6,877 $5.40 $37.1k6.9k shares +4%
2026-08-18 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 5,736 $5.32 $30.5k5.7k shares +3%
2026-08-17 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 7,117 $5.33 $37.9k7.1k shares +4%
2026-08-14 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 6,029 $5.23 $31.5k6.0k shares +4%
2026-08-13 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 5,629 $5.20 $29.3k5.6k shares +4%
2026-08-13 BURKE RUSSELL E III Director Bought 1,625 $5.21 $8.5k1.6k shares +4%
2026-08-12 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 6,248 $5.15 $32.2k6.2k shares +4%
2026-08-11 WINMILL & CO. INC "See ""Explanation of Responses""" Bought 5,887 $5.17 $30.4k5.9k shares +4%
2026-05-14 WINMILL MARK CAMPBELL President and CEO, director Bought 4,000 $5.33 $21.3k4.0k shares +1%

Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 WINMILL & CO. INC 0.68% of their portfolio WALPOLE, NH 586,500586.5k $3.1m $3.1m 0.68% Unchanged
2 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 434,491434.5k $2.3m $2.3m 0.00% Added +4.5k +4,488
3 BlackRock, Inc. 0.00% of their portfolio New York, NY 397,495397.5k $2.1m $2.1m 0.00% Added +102.9k +102,855
4 MARATHON CAPITAL MANAGEMENT 0.28% of their portfolio Hunt Valley, MD 260,784260.8k $1.4m $1.4m 0.28% Added +1.2k +1,157
5 Private Capital Management, LLC 0.11% of their portfolio NAPLES, FL 223,337223.3k $1.2m $1.2m 0.11% Added +119.8k +119,788
6 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 198,075198.1k $1.0m $1.0m 0.00% Reduced -18.1k -18,100
7 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 143,249143.2k $750.8k $750.8k 0.00% Reduced -1.0k -1,013
8 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 130,918130.9k $686.0k $686.0k 0.00% Reduced -1 -1
9 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 77,80377.8k $407.7k $407.7k 0.00% Added +4.7k +4,689
10 Kestra Advisory Services, LLC 0.00% of their portfolio AUSTIN, TX 67,16767.2k $352.0k $352.0k 0.00% Added +4.0k +4,047
11 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 60,68960.7k $318.0k $318.0k 0.00% Added +458 +458
12 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 57,89657.9k $303.4k $303.4k 0.00% Reduced -3.2k -3,233
13 Towneley Capital Management, Inc / DE 0.05% of their portfolio LAGUNA HILLS, CA 49,04749.0k $257.0k $257.0k 0.05% Added +672 +672
14 RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio ST. PETERSBURG, FL 46,02946.0k $241.2k $241.2k 0.00% Added +5.1k +5,091
15 Baker Ellis Asset Management LLC 0.02% of their portfolio Vancouver, WA 37,00037.0k $193.9k $193.9k 0.02% Added +2.0k +2,000
16 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 36,27136.3k $190.1k $190.1k 0.00% Added +9.7k +9,730
17 PFG Investments, LLC 0.01% of their portfolio WOODBURY, NY 35,51135.5k $186.1k $186.1k 0.01% Added +109 +109
18 WealthTrust Axiom LLC 0.04% of their portfolio WAYNE, PA 32,00032.0k $167.7k $167.7k 0.04% Added +1.0k +1,000
19 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 31,58031.6k $165.5k $165.5k 0.00% Unchanged
20 Crossingbridge Advisors, LLC 0.03% of their portfolio PLEASANTVILLE, NY 30,00030.0k $157.2k $157.2k 0.03% Reduced -5.3k -5,271
21 AlphaCentric Advisors LLC 0.13% of their portfolio SAN JUAN, PR 30,00030.0k $157.2k $157.2k 0.13% Reduced -5.3k -5,271
22 Cetera Investment Advisers 0.00% of their portfolio SCHAUMBURG, IL 28,45228.5k $149.1k $149.1k 0.00% Reduced -15.0k -14,983
23 LPL Financial LLC 0.00% of their portfolio FORT MILL, SC 28,17228.2k $147.6k $147.6k 0.00% Added +203 +203
24 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 27,61427.6k $144.7k $144.7k 0.00% New
25 Man Group plc 0.00% of their portfolio LONDON, X0 26,73026.7k $140.1k $140.1k 0.00% Added +1.8k +1,771
26 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 25,43525.4k $133.3k $133.3k 0.00% Added +53 +53
27 JAMES INVESTMENT RESEARCH, INC. 0.01% of their portfolio ALPHA, OH 24,10024.1k $126.3k $126.3k 0.01% Unchanged
28 NewEdge Advisors, LLC 0.00% of their portfolio NEW ORLEANS, LA 24,10024.1k $126.3k $126.3k 0.00% Unchanged
29 Merit Financial Group, LLC 0.00% of their portfolio ALPHARETTA, GA 23,29723.3k $122.1k $122.1k 0.00% Added +5.3k +5,322
30 UBS Group AG 0.00% of their portfolio ZURICH, V8 23,24423.2k $121.8k $121.8k 0.00% Added +674 +674
31 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 19,97120.0k $105.0k $105.0k 0.00% Unchanged
32 Ethos Financial Group, LLC 0.01% of their portfolio KING OF PRUSSIA, PA 19,17519.2k $100.5k $100.5k 0.01% Reduced -2.6k -2,635
33 HSBC HOLDINGS PLC 0.00% of their portfolio LONDON, X0 17,27117.3k $88.3k $88.3k 0.00% Unchanged
34 O'SHAUGHNESSY ASSET MANAGEMENT, LLC 0.00% of their portfolio Stamford, CT 17,09617.1k $89.6k $89.6k 0.00% Added +1.4k +1,376
35 BARD ASSOCIATES INC 0.02% of their portfolio CHICAGO, IL 15,65115.7k $82.0k $82.0k 0.02% Reduced -1.0k -1,004
36 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 13,47713.5k $69.7k $69.7k 0.00% Added +5.9k +5,866
37 RITHOLTZ WEALTH MANAGEMENT 0.00% of their portfolio NEW YORK, NY 11,98512.0k $62.8k $62.8k 0.00% Added +1.1k +1,078
38 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 10,57810.6k $55.4k $55.4k 0.00% Added +49 +49
39 Financial Gravity Companies, Inc. 0.01% of their portfolio Lakeway, TX 6,4256.4k $33.7k $33.7k 0.01% First filing
40 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 5,7255.7k $30.0k $30.0k 0.00% Added +39 +39
41 SIMPLEX TRADING, LLC 0.00% of their portfolio CHICAGO, IL 4,6134.6k $24.2k $24.2k 0.00% Reduced -2.0k -2,005
42 Vanguard Global Advisers, LLC 0.00% of their portfolio MALVERN, PA 4,0544.1k $21.2k $21.2k 0.00% Unchanged
43 BROADWATER CAPITAL MANAGEMENT LLC 0.01% of their portfolio BOSTON, MA 2,0002.0k $10.5k $10.5k 0.01% Unchanged
44 PNC Financial Services Group, Inc. 0.00% of their portfolio Pittsburgh, PA 1,9001.9k $10.0k $10.0k 0.00% Unchanged
45 JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio DES PERES, MO 800800 $4.1k $4.1k 0.00% Reduced -204 -204
46 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 662662 $3.5k $3.5k 0.00% Added +254 +254
47 BARTLETT & CO. WEALTH MANAGEMENT LLC 0.00% of their portfolio CINCINNATI, OH 505505 $2.6k $2.6k 0.00% Unchanged
48 FMR LLC 0.00% of their portfolio BOSTON, MA 400400 $2.1k $2.1k 0.00% Unchanged
49 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 140140 $734 $734 0.00% Reduced -5.5k -5,489
50 Capital Advisors, Ltd. LLC 0.00% of their portfolio SHAKER HEIGHTS, OH 7171 $0 $0 0.00% Unchanged
51 ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio Boston, MA 4949 $0 $0 0.00% Reduced -1.4k -1,382