Global Self Storage affiliate buys 15,308 shares

Rhea-AI Filing Summary

Global Self Storage, Inc. (SELF) reported that Winmill & Co. Inc., which may be deemed an affiliate, purchased a total of 15,308 shares of common stock in open-market or private transactions. The purchases occurred on 2026-08-25 and 2026-08-26 at prices around $5.64–$5.66 per share. The filing notes that members of the Winmill family and the Winmill Family Trust may be deemed to have indirect beneficial ownership but each disclaims beneficial ownership of these shares.

Insider Trade Summary

Net Buyer: 15,308 shares

Net Buy 2 txns

Insider WINMILL & CO. INC

Role Insider

Bought 15,308 shs ($86K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	7,761	$5.6381	$44K
Purchase	Common Stock	7,547	$5.6572	$43K

Holdings After Transaction: Common Stock — 228,512 shares (Direct)

Key Figures

Shares purchased on 2026-08-25: 7,547 shares of Common Stock Per-share price on 2026-08-25: $5.6572 per share Shares purchased on 2026-08-26: 7,761 shares of Common Stock +2 more

5 metrics

Shares purchased on 2026-08-25 7,547 shares of Common Stock Purchase transaction by Winmill & Co. Inc. on 2026-08-25

Per-share price on 2026-08-25 $5.6572 per share Purchase price for 7,547 shares of Common Stock

Shares purchased on 2026-08-26 7,761 shares of Common Stock Purchase transaction by Winmill & Co. Inc. on 2026-08-26

Per-share price on 2026-08-26 $5.6381 per share Purchase price for 7,761 shares of Common Stock

Net shares purchased 15,308 shares of Common Stock Total net buy volume across reported transactions

Key Terms

affiliate, beneficial ownership, indirect beneficial ownership

3 terms

affiliate financial

"The Reporting Person may be deemed to be an affiliate of the Issuer."

beneficial ownership financial

"may be deemed to have indirect beneficial ownership of the Reporting Person's shares"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

indirect beneficial ownership financial

"may be deemed to have indirect beneficial ownership of the Reporting Person's shares"

FAQ

What insider transactions were reported for SELF in this Form 4?

The Form 4 reports that Winmill & Co. Inc. purchased a total of 15,308 shares of Global Self Storage, Inc. common stock in open-market or private transactions on 2026-08-25 and 2026-08-26.

At what prices were SELF shares purchased in this Form 4?

Winmill & Co. Inc. purchased SELF common stock at per-share prices of $5.6572 for 7,547 shares on 2026-08-25 and $5.6381 for 7,761 shares on 2026-08-26.

Who is the reporting person in the SELF Form 4?

The reporting person is Winmill & Co. Inc., which may be deemed to be an affiliate of Global Self Storage, Inc. The Winmill Family Trust owns all of Winmill & Co. Inc.’s voting stock.

How many SELF shares did insiders associated with the Winmill family acquire?

Through Winmill & Co. Inc., entities associated with the Winmill family acquired 15,308 shares of Global Self Storage, Inc. common stock in total, as disclosed in this Form 4.

Do the Winmill family members claim beneficial ownership of the SELF shares?

The Form 4 states that Thomas B. Winmill, Mark C. Winmill, William Winmill, Woodworth Winmill, and the Winmill Family Trust may be deemed to have indirect beneficial ownership but each disclaims beneficial ownership of these shares.

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Available on EDGAR 08/26/2026 - 04:48 PM Accepted by SEC EDGAR 08/26/2026 - 04:47 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED 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)

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			See "Explanation of Responses"

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/25/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/25/2026		P		7,547	A	$5.6572	220,751	D
Common Stock	08/26/2026		P		7,761	A	$5.6381	228,512	D

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount 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. Incorporated	08/26/2026
	** Signature of Reporting Person	Date
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)