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  4. [Form 4] Global Self Storage, Inc. Insider Trading Activity

Global Self Storage (SELF) affiliate adds 11,658 shares in open-market buys

Filing Impact
(Neutral)
Filing Sentiment
(Positive)
Form Type
4

Rhea-AI Filing Summary

Global Self Storage, Inc. reported that Winmill & Co. Inc., which may be deemed an affiliate, purchased shares of the company’s common stock in the open market. The entity bought 11,658 shares over two days at prices around $5.21–$5.23 per share. The Winmill Family Trust controls Winmill & Co. Inc. and related individuals disclaim beneficial ownership of these shares.

Positive

  • None.

Negative

  • None.
Insider WINMILL & CO. INC
Role Insider
Bought 11,658 shs ($61K)
Type Security Shares Price Value
Purchase Common Stock 6,029 $5.2265 $32K
Purchase Common Stock 5,629 $5.2011 $29K
Holdings After Transaction: Common Stock — 171,434 shares (Direct)
Shares purchased 2026-08-14 6,029 shares Common Stock bought by Winmill & Co. Inc. on August 14, 2026
Price per share 2026-08-14 $5.2265 per share Purchase price for 6,029 Common Stock shares
Shares purchased 2026-08-13 5,629 shares Common Stock bought by Winmill & Co. Inc. on August 13, 2026
Price per share 2026-08-13 $5.2011 per share Purchase price for 5,629 Common Stock shares
Total shares bought 11,658 shares Net Common Stock purchases across both reported transactions
Number of buy transactions 2 Open-market or private purchase transactions reported in this Form 4
affiliate of the Issuer regulatory
"The Reporting Person may be deemed to be an affiliate of the Issuer."
indirect beneficial ownership financial
"may be deemed to have indirect beneficial ownership of the Reporting Person's shares"
disclaims beneficial ownership financial
"the Winmill Family Trust disclaims beneficial ownership of these shares"

FAQ

What insider activity was reported for SELF in this Form 4?
Winmill & Co. Inc., an entity that may be deemed an affiliate of Global Self Storage (SELF), reported open-market purchases totaling 11,658 common shares over two days at prices slightly above $5.20 per share.

How many Global Self Storage (SELF) shares did Winmill & Co. Inc. buy and at what prices?
Winmill & Co. Inc. bought 6,029 shares at $5.2265 on August 14, 2026 and 5,629 shares at $5.2011 on August 13, 2026, all in Global Self Storage common stock.

Who controls the reporting person in the SELF Form 4 filing?
All voting stock of Winmill & Co. Inc. is owned by the Winmill Family Trust. Trustees Thomas B., Mark C., William, and Woodworth Winmill may be deemed to have indirect beneficial ownership through their control of the trust and the reporting person.

Do the Winmill trustees claim beneficial ownership of the SELF shares bought?
No. The filing states that each trustee and the Winmill Family Trust expressly disclaims beneficial ownership of the Global Self Storage shares held by Winmill & Co. Inc., despite potential indirect beneficial ownership under securities rules.

Was the SELF insider buying done under a Rule 10b5-1 trading plan?
The Form 4 indicates the Rule 10b5-1 checkbox is not marked as an affirmative plan. The filing does not describe these Global Self Storage share purchases as being executed pursuant to a pre-arranged 10b5-1 trading plan.

Is Winmill & Co. Inc. identified as a 10% owner of Global Self Storage (SELF)?
In this Form 4, Winmill & Co. Inc. is not flagged as a 10% owner, director, or officer. It is described as a possible affiliate of the issuer, with ownership relationships explained through the Winmill Family Trust.

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
WINMILL & CO. INC
(Last)(First)(Middle)
17 OLD DREWSVILLE RD
(Street)
WALPOLE NEW HAMPSHIRE 03608
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
Global Self Storage, Inc. [ SELF ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
Officer (give title below)XOther (specify below)
See "Explanation of Responses"
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/13/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock08/13/2026P5,629A$5.2011165,405D
Common Stock08/14/2026P6,029A$5.2265171,434D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
Remarks:
The Reporting Person may be deemed to be an affiliate of the Issuer. The Winmill Family Trust owns all of the voting stock of the Reporting Person. Thomas B. Winmill, Mark C. Winmill, William Winmill, and Woodworth Winmill are trustees of the Winmill Family Trust and may be deemed to have indirect beneficial ownership of the Reporting Person's shares as a result of their status as controlling persons of the Winmill Family Trust and the Reporting Person. Each of Thomas B. Winmill, Mark C. Winmill, William Winmill, Woodworth Winmill, and the Winmill Family Trust disclaims beneficial ownership of these shares.
Donald Klimoski, on behalf of Winmill & Co. Incorporated08/14/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR