Winmill & Co. increases Global Self Storage (SELF) stake with open-market buys

Rhea-AI Filing Summary

Global Self Storage, Inc. (SELF) reported an insider ownership change by Winmill & Co. Incorporated. Winmill & Co. purchased 6,226 shares of common stock on 11/17/2025 at $5.1246 per share and 5,618 shares on 11/18/2025 at $5.1578 per share in open-market transactions coded as purchases. Following these trades, Winmill & Co. directly owns 109,431 shares of Global Self Storage common stock. The remarks note that Winmill & Co. may be deemed an affiliate of the company and that the Winmill Family Trust, whose trustees include Thomas B., Mark C., William, and Woodworth Winmill, may be deemed to have indirect beneficial ownership, although each party disclaims beneficial ownership of these shares.

Insider Trade Summary

Net Buyer: 11,844 shares ($60,882)

Net Buy 2 txns

Insider WINMILL & CO. INC

Role Insider

Bought 11,844 shs ($61K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	5,618	$5.1578	$29K
Purchase	Common Stock	6,226	$5.1246	$32K

Holdings After Transaction: Common Stock — 109,431 shares (Direct)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

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)

2255 BUFFALO ROAD

(Street)

ROCHESTER NY 14624

(City) (State) (Zip)

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"

3. Date of Earliest Transaction (Month/Day/Year)
11/17/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

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

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	11/17/2025		P		6,226	A	$5.1246	103,813	D
Common Stock	11/18/2025		P		5,618	A	$5.1578	109,431	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 II, on behalf of Winmill & Co. Incorporated	11/18/2025
	** 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.

FAQ

What insider transaction did Winmill & Co. report for Global Self Storage (SELF)?

Winmill & Co. Incorporated reported open-market purchases of Global Self Storage (SELF) common stock on 11/17/2025 and 11/18/2025, increasing its directly owned share position.

How many Global Self Storage (SELF) shares did Winmill & Co. buy and at what prices?

Winmill & Co. bought 6,226 shares on 11/17/2025 at $5.1246 per share and 5,618 shares on 11/18/2025 at $5.1578 per share, all coded as purchases.

What is Winmill & Co.’s total Global Self Storage (SELF) ownership after these trades?

After the reported transactions, Winmill & Co. directly owns 109,431 shares of Global Self Storage common stock.

What is Winmill & Co.’s relationship to Global Self Storage (SELF)?

The report states that the reporting person may be deemed to be an affiliate of Global Self Storage, Inc., indicating a significant ongoing relationship with the issuer.

Who may have indirect beneficial ownership of the SELF shares held by Winmill & Co.?

The Winmill Family Trust owns all of Winmill & Co.’s voting stock, and its trustees—Thomas B., Mark C., William, and Woodworth Winmill—may be deemed to have indirect beneficial ownership, though each disclaims beneficial ownership.

Does the Form 4 for SELF report any derivative securities for Winmill & Co.?

The Form 4’s Table II for derivative securities is present but does not list any specific derivative transactions or holdings for the reporting person.