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
11.3M shares
Disclosed Ownership
948K 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% 948K 339K 608K /s/ Mark C. Winmill Mark Campbell Winmill 0001019264
Thomas Bassett Winmill 5.2% 588K 1.1K 587K /s/ Thomas B. Winmill Thomas Bassett Winmill 0001018500
Winmill Family Trust 5.2% 587K 0 587K /s/ Thomas B. Winmill Thomas B. Winmill/Trustee
Winmill & Co. Incorporated 5.2% 587K 148K 439K /s/ Donald Klimoski II Donald Klimoski II/Co-General Counsel 0000052234
Midas Securities Group, Inc. 3.9% 439K 135K 304K /s/ Russell Kamerman Russell Kamerman/General Counsel 0001141394
TUXIS CORP 2.7% 304K 304K 0 /s/ Donald Klimoski II Donald Klimoski II/General Counsel 0000736952