Global Self Storage SELF Insider Ownership

NASDAQ SELF

$4.89 +0.03 (+0.62%)

At close: Oct 23, 2026 · 4:00 PM EDT

Insider Holdings by Owner

1.17Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

10.17%

▲+0.761% pp QoQ

Shares Held by Insiders

1.16Mn

filed for Sep 2026

▲+8.08% QoQ

Shares Outstanding

11.42Mn

11,421,420 shares

Direct Holdings

1.16Mn

Indirect: 0

Net Open-Market Trades

+86.50K

net bought · $465.81K in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Open-Market Insider Trades

Bought Sold

Latest quarter —

Net over range —

Net-buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

Across the past 12 months, open-market trades by Global Self Storage insiders were all purchases, totaling $940,668 (179.25K shares).

Counted by insider, open-market buying of SELF stock in the past 12 months came from 4 insiders, with no insider selling.
Among Global Self Storage insiders, Winmill & Co. Inc led open-market buying over the past 12 months with $804,014 of purchases (152.78K shares); the latest was on August 26, 2026.
Mark Campbell Winmill (President and CEO) made the most recent open-market trade by an insider of Global Self Storage, a purchase of 342 shares for $1,765 on September 10, 2026.
In transactions other than open-market trades, Global Self Storage insiders received 42.76K shares in stock awards over the past 12 months.
Per Business Quant data, Global Self Storage insiders hold 1.16Mn shares in total based on their latest Form 4 filings, up 8.08% from 1.08Mn shares at the end of Q2 2026 and up 25.50% from 926.01K shares at the end of Q3 2025.
Global Self Storage insiders report no indirect holdings: all 1.16Mn shares are held directly.
Per Business Quant, 9 insiders of SELF hold shares, counting officers, directors and 10% owners who have filed a Form 4 in the past two years.
Global Self Storage's three largest insider shareholders, based on their latest Form 4 filings, are Mark Campbell Winmill (President and CEO, 372.58K shares), Tuxis Corp (303.76K shares) and Winmill & Co. Inc (228.51K shares).
The largest insider, Mark Campbell Winmill, holds 32.06% of SELF's insider total.
Institutional holders reported 29.15% of Global Self Storage's outstanding shares for Q2 2026; insiders' latest Form 4 filings put their stake at about 10.17%, and other investors, including the public, hold the remaining 60.68%.
Over the past 12 months, 7 insiders reported transactions in Global Self Storage stock in 30 Form 4 filings.
This summary of Global Self Storage insider activity covers Form 4 filings through September 11, 2026.

Form 4 Holdings

Insiders Holding SELF

Insiders 10

Shares held 1.17Mn

Of outstanding 10.21%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	Mark Campbell Winmill	President And Ceo	372,582	372,582	32.0%	11 Sep, 2026
2	Corp Tuxis	Other	303,758	303,758	26.1%	19 May, 2025
3	Co. Inc Winmill	Other	228,512	228,512	19.6%	26 Aug, 2026
4	Donald Ii Klimoski	General Counsel	97,554	97,554	8.4%	25 Mar, 2026
5	Thomas Omalley	Chief Financial Officer	91,694	91,694	7.9%	25 Mar, 2026
6	Russell E Iii Burke	Director	40,002	40,002	3.4%	14 Aug, 2026
7	William Chester Zachary	Director	18,296	18,296	1.6%	13 Aug, 2026
8	Russell Kamerman	Assistant General Counsel	5,925	5,925	0.5%	25 Mar, 2026
9	Sally Coonrad Carroll	Director	3,776	3,776	0.3%	22 May, 2025
10	George B Langa	Director	3,547	3,547	0.3%	29 Nov, 2022

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

331 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
09 Sep, 2026	Mark Campbell Winmill	President And Ceo	Acquired P	1,600	$5.16	$8.26K	370,182	Direct
09 Sep, 2026	Mark Campbell Winmill	President And Ceo	Acquired P	2,058	$5.16	$10.62K	372,240	Direct
10 Sep, 2026	Mark Campbell Winmill	President And Ceo	Acquired P	50	$5.16	$258	372,290	Direct
10 Sep, 2026	Mark Campbell Winmill	President And Ceo	Acquired P	292	$5.16	$1.51K	372,582	Direct
25 Aug, 2026	Co. Inc Winmill	Other	Acquired P	7,547	$5.66	$42.69K	220,751	Direct
26 Aug, 2026	Co. Inc Winmill	Other	Acquired P	7,761	$5.64	$43.76K	228,512	Direct
21 Aug, 2026	Co. Inc Winmill	Other	Acquired P	7,117	$5.45	$38.81K	205,182	Direct
24 Aug, 2026	Co. Inc Winmill	Other	Acquired P	8,022	$5.62	$45.05K	213,204	Direct
19 Aug, 2026	Co. Inc Winmill	Other	Acquired P	6,877	$5.40	$37.16K	191,164	Direct
20 Aug, 2026	Co. Inc Winmill	Other	Acquired P	6,901	$5.42	$37.42K	198,065	Direct
17 Aug, 2026	Co. Inc Winmill	Other	Acquired P	7,117	$5.33	$37.94K	178,551	Direct
18 Aug, 2026	Co. Inc Winmill	Other	Acquired P	5,736	$5.32	$30.51K	184,287	Direct
13 Aug, 2026	Russell E Iii Burke	Director	Acquired P	1,625	$5.21	$8.46K	40,002	Direct
13 Aug, 2026	Co. Inc Winmill	Other	Acquired P	5,629	$5.20	$29.28K	165,405	Direct
14 Aug, 2026	Co. Inc Winmill	Other	Acquired P	6,029	$5.23	$31.51K	171,434	Direct
11 Aug, 2026	William Chester Zachary	Director	Acquired A	196	$5.10	$1,000	18,296	Direct
11 Aug, 2026	Russell E Iii Burke	Director	Acquired A	196	$5.10	$1,000	38,377	Direct
11 Aug, 2026	Co. Inc Winmill	Other	Acquired P	5,887	$5.17	$30.41K	153,528	Direct
12 Aug, 2026	Co. Inc Winmill	Other	Acquired P	6,248	$5.15	$32.19K	159,776	Direct
14 May, 2026	Mark Campbell Winmill	President And Ceo	Acquired P	4,000	$5.33	$21.32K	368,582	Direct

Showing 1 to 20 of 331 transactions