Global Self Storage, Inc. (SELF) Insider Ownership

Historic Insider Ownership Trends

SELF's three largest insider shareholders as of April 28, 2026 are Mark Campbell Winmill (President And Ceo, 364.58K shares), Corp Tuxis (Other, 303.76K shares), Co. Inc Winmill (Other, 147.64K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Mark Campbell Winmill President And Ceo 364,582 0 25 Mar, 2026
Corp Tuxis - 303,758 0 19 May, 2025
Co. Inc Winmill - 147,641 0 01 Dec, 2025
Donald Ii Klimoski General Counsel 97,554 0 25 Mar, 2026
Thomas Omalley Chief Financial Officer 91,694 0 25 Mar, 2026
Russell E Iii Burke - 38,087 0 01 Apr, 2026
William Chester Zachary - 18,006 0 01 Apr, 2026
Russell Kamerman Assistant General Counsel 5,925 0 25 Mar, 2026
Sally Coonrad Carroll - 3,776 0 22 May, 2025
George B Langa - 3,547 0 29 Nov, 2022

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
31 Mar, 2026 William Chester Zachary Common Stock A 2,739 $5.11 18,006 D A
31 Mar, 2026 Russell E Iii Burke Common Stock A 2,739 $5.11 38,087 D A
24 Mar, 2026 Thomas Omalley Common Stock A 5,527 $5.08 86,167 D A
24 Mar, 2026 Russell Kamerman Common Stock A 500 $5.10 5,925 D A
24 Mar, 2026 Mark Campbell Winmill Common Stock A 12,672 $5.08 351,910 D A
24 Mar, 2026 Donald Ii Klimoski Common Stock A 5,527 $5.08 92,027 D A
24 Mar, 2026 Mark Campbell Winmill Common Stock A 12,672 $5.10 364,582 D A
24 Mar, 2026 Donald Ii Klimoski Common Stock A 5,527 $5.10 97,554 D A
24 Mar, 2026 Thomas Omalley Common Stock A 5,527 $5.10 91,694 D A
03 Dec, 2025 Mark Campbell Winmill Common Stock A 6,000 $5.13 328,838 D P
04 Dec, 2025 Mark Campbell Winmill Common Stock A 6,000 $5.14 334,838 D P
05 Dec, 2025 Mark Campbell Winmill Common Stock A 800 $5.05 335,638 D P
05 Dec, 2025 Mark Campbell Winmill Common Stock A 3,600 $5.09 339,238 D P
02 Dec, 2025 Donald Ii Klimoski Common Stock A 446 $5.05 86,500 D P
28 Nov, 2025 Co. Inc Winmill Common Stock A 3,342 $5.16 144,579 D P
01 Dec, 2025 Co. Inc Winmill Common Stock A 3,062 $5.18 147,641 D P
25 Nov, 2025 Co. Inc Winmill Common Stock A 4,547 $5.18 136,364 D P
26 Nov, 2025 Co. Inc Winmill Common Stock A 4,873 $5.17 141,237 D P
21 Nov, 2025 Co. Inc Winmill Common Stock A 6,226 $5.09 127,753 D P
24 Nov, 2025 Co. Inc Winmill Common Stock A 4,064 $5.14 131,817 D P