STOCK TITAN

Global Self Storage CEO buys 4,000 shares

Global Self Storage’s President and CEO acquired 4,000 SELF common shares in open-market or private purchases at $5.16 per share over two days.

(Neutral)
(Positive)
Form Type
4

Rhea-AI Filing Summary

Global Self Storage, Inc. (SELF) reported that its President and CEO, Mark Campbell Winmill, who is also a director, purchased additional shares of the company’s common stock. On September 9 and 10, 2026, he bought a total of 4,000 shares in open-market or private transactions at $5.16 per share. No Rule 10b5-1 trading plan is reported for these purchases.

Positive

  • None.

Negative

  • None.
Insider WINMILL MARK CAMPBELL
Role President and CEO
Bought 4,000 shs ($21K)
Type Security Shares Price Value
Purchase Common Stock 50 $5.16 $258.00
Purchase Common Stock 292 $5.16 $2K
Purchase Common Stock 1,600 $5.16 $8K
Purchase Common Stock 2,058 $5.16 $11K
Holdings After Transaction: Common Stock — 372,582.289 shares (Direct)
Total shares purchased 4,000 shares Common stock bought by the President and CEO on September 9–10, 2026
Purchase price per share $5.16 per share Price paid for each share in the reported transactions
Total transaction value $20,640 4,000 shares purchased at $5.16 per share
Shares bought on September 9, 2026 3,658 shares Two purchases of 1,600 and 2,058 shares at $5.16 per share
Shares bought on September 10, 2026 342 shares Two purchases of 50 and 292 shares at $5.16 per share
open market financial
"Purchase in open market or private transaction"
An open market is a system where buying and selling of goods, services, or financial assets happen freely without restrictions or special controls. For investors, it means they can trade assets easily and quickly, which helps determine fair prices based on supply and demand. This environment encourages transparency and competition, making it easier to buy or sell with confidence.
private transaction financial
"Purchase in open market or private transaction"
A private transaction is the sale or transfer of securities, assets, or ownership stakes carried out directly between a small number of parties rather than on a public exchange. For investors it matters because these deals are less visible and often less liquid than public trades, so pricing can be harder to verify, the investment can be harder to sell quickly, and buyers or sellers may gain strategic advantages not available in open markets — like negotiated terms similar to a private garage sale versus a crowded marketplace.
Rule 10b5-1 trading plan regulatory
"No Rule 10b5-1 trading plan is reported for these purchases"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider buying did SELF report in this Form 4?

The President and CEO of Global Self Storage purchased a total of 4,000 shares of common stock in open-market or private transactions at $5.16 per share on September 9 and 10, 2026.

On what dates did the SELF CEO buy shares?

The President and CEO of Global Self Storage bought common shares on September 9, 2026 and September 10, 2026 in open-market or private transactions.

At what price were the SELF shares purchased by the CEO?

All reported purchases by the Global Self Storage President and CEO were made at $5.16 per share for the company’s common stock.

How many SELF shares did the CEO buy in total?

Across four reported transactions, the President and CEO of Global Self Storage acquired 4,000 shares of common stock, split between two trades on September 9 and two trades on September 10, 2026.

Were the SELF insider purchases made under a Rule 10b5-1 trading plan?

No. The filing indicates no Rule 10b5-1 trading plan is reported for the President and CEO’s purchases of Global Self Storage common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Learn about SEC filing dates
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 MARK CAMPBELL

(Last)(First)(Middle)
3814 ROUTE 44

(Street)
MILLBROOK NEW YORK 12545

(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)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
President and CEO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
09/09/2026
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 Stock09/09/2026P1,600A$5.16370,182.289D
Common Stock09/09/2026P2,058A$5.16372,240.289D
Common Stock09/10/2026P50A$5.16372,290.289D
Common Stock09/10/2026P292A$5.16372,582.289D
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:
Mark Winmill09/11/2026
** 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)

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