Mark Winmill - 03 Dec 2025 SCHEDULE 13D/A Report for GLOBAL SELF STORAGE, INC. Common Stock, $0.01 par value per share (SELF)

Filing Manager
Mark Winmill
Reporting Manager
Mark Campbell Winmill
Security
GLOBAL SELF STORAGE, INC. Common Stock, $0.01 par value per share
Symbol
SELF
Shares outstanding
11,282,563 shares
Disclosed Ownership
947,735 shares
Ownership
8.4%
Form type
SCHEDULE 13D/A
Filing time
05 Dec 2025, 16:26:25 UTC
Date of event
03 Dec 2025
Previous filing
21 May 2025
SEC
View on sec.gov

Reporting Managers (6)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Mark Campbell Winmill 8.4% 947,735 339,238 608,497 /s/ Mark C. Winmill Mark Campbell Winmill 0001019264
Thomas Bassett Winmill 5.2% 587,600 1,100 586,500 /s/ Thomas B. Winmill Thomas Bassett Winmill 0001018500
Winmill Family Trust 5.2% 586,500 0 586,500 /s/ Thomas B. Winmill Thomas B. Winmill/Trustee
Winmill & Co. Incorporated 5.2% 586,500 147,641 438,859 /s/ Donald Klimoski II Donald Klimoski II/Co-General Counsel 0000052234
Midas Securities Group, Inc. 3.9% 438,859 135,101 303,758 /s/ Russell Kamerman Russell Kamerman/General Counsel 0001141394
TUXIS CORP 2.7% 303,758 303,758 0 /s/ Donald Klimoski II Donald Klimoski II/General Counsel 0000736952