Mark Campbell Winmill

CIK: 0001019264

Transaction Breakdown

Open Market Buys (P)10 (71.4%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)4 (28.6%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

SELF

Global Self Storage, Inc.

DirectorOfficer

Discretionary Trading P&L

Holdings

Transaction History (14 total)

SELF
Global Self Storage, Inc.
Sep 10, 2026
Purchase(P)
Direct
292 shares at avg. $5.16$2K
SELF
Global Self Storage, Inc.
Sep 10, 2026
Purchase(P)
Direct
50 shares at avg. $5.16$258
SELF
Global Self Storage, Inc.
Sep 9, 2026
Purchase(P)
Direct
1.6K shares at avg. $5.16$8K
SELF
Global Self Storage, Inc.
Sep 9, 2026
Purchase(P)
Direct
2.1K shares at avg. $5.16$11K
SELF
Global Self Storage, Inc.
May 14, 2026
Purchase(P)
Direct
4K shares at avg. $5.33$21K
SELF
Global Self Storage, Inc.
Mar 24, 2026
Award(A)
Direct
12.7K shares at avg. $5.10$65K
SELF
Global Self Storage, Inc.
Mar 24, 2026
Award(A)
Direct
12.7K shares at avg. $5.08$64K
SELF
Global Self Storage, Inc.
Dec 5, 2025
Purchase(P)
Direct
3.6K shares at avg. $5.09$18K
SELF
Global Self Storage, Inc.
Dec 5, 2025
Purchase(P)
Direct
800 shares at avg. $5.05$4K
SELF
Global Self Storage, Inc.
Dec 4, 2025
Purchase(P)
Direct
6K shares at avg. $5.14$31K
SELF
Global Self Storage, Inc.
Dec 3, 2025
Purchase(P)
Direct
6K shares at avg. $5.13$31K
SELF
Global Self Storage, Inc.
May 19, 2025
Purchase(P)
Direct
10K shares at avg. $5.67$57K
SELF
Global Self Storage, Inc.
Mar 25, 2025
Award(A)
Direct
12.7K shares at avg. $5.08$64K
SELF
Global Self Storage, Inc.
Mar 25, 2025
Award(A)
Direct
12.7K shares at avg. $4.32$55K

		Type	Shares	Price		Ownership
Sep 10, 2026	SELF Global Self Storage, Inc.	Purchase(P)	292	$5.16	$1,507	Direct
Sep 10, 2026	SELF Global Self Storage, Inc.	Purchase(P)	50	$5.16	$258	Direct
Sep 9, 2026	SELF Global Self Storage, Inc.	Purchase(P)	1,600	$5.16	$8,256	Direct
Sep 9, 2026	SELF Global Self Storage, Inc.	Purchase(P)	2,058	$5.16	$10,619	Direct
May 14, 2026	SELF Global Self Storage, Inc.	Purchase(P)	4,000	$5.33	$21,320	Direct
Mar 24, 2026	SELF Global Self Storage, Inc.	Award(A)	12,672	$5.10	$64,627	Direct
Mar 24, 2026	SELF Global Self Storage, Inc.	Award(A)	12,672	$5.08	$64,374	Direct
Dec 5, 2025	SELF Global Self Storage, Inc.	Purchase(P)	3,600	$5.09	$18,324	Direct
Dec 5, 2025	SELF Global Self Storage, Inc.	Purchase(P)	800	$5.05	$4,040	Direct
Dec 4, 2025	SELF Global Self Storage, Inc.	Purchase(P)	6,000	$5.14	$30,849	Direct
Dec 3, 2025	SELF Global Self Storage, Inc.	Purchase(P)	6,000	$5.13	$30,770	Direct
May 19, 2025	SELF Global Self Storage, Inc.	Purchase(P)	10,000	$5.67	$56,700	Direct
Mar 25, 2025	SELF Global Self Storage, Inc.	Award(A)	12,672	$5.08	$64,374	Direct
Mar 25, 2025	SELF Global Self Storage, Inc.	Award(A)	12,672	$4.32	$54,743	Direct

1-14 of 14 transactions

About WINMILL MARK CAMPBELL

WINMILL MARK CAMPBELL (SEC CIK 0001019264) files insider reports with the SEC as President and CEO of Global Self Storage, Inc. (SELF).

Signal8 holds 6 ownership filings by WINMILL MARK CAMPBELL, all Form 4s, filed between Mar 26, 2025 and Sep 11, 2026. Those filings report 14 transactions, from Mar 25, 2025 to Sep 10, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on WINMILL MARK CAMPBELL's filings is in MILLBROOK, NY.

Recent filings by WINMILL MARK CAMPBELL

Sep 10, 2026: Open-market purchases of SELF shares (2 lines, Form 4, code P).
Sep 9, 2026: Open-market purchases of SELF shares (2 lines, Form 4, code P).
May 14, 2026: Open-market purchase of SELF shares (Form 4, code P).
Mar 24, 2026: Grants or awards of SELF shares (2 lines, Form 4, code A).
Dec 5, 2025: Open-market purchases of SELF shares (2 lines, Form 4, code P).

Other insiders filing for Global Self Storage, Inc. (SELF)

WINMILL & CO. INC, Officer
BURKE RUSSELL E III, Director
Zachary William Chester, Director
Kamerman Russell, Assistant General Counsel
Klimoski Donald II, General Counsel
OMalley Thomas, Chief Financial Officer

How to read Form 4 transaction codes