Global Self Storage
SELF on Nasdaq. Market value $56m.
Should I look at this?
We have not checked this company yet
This is not advice.
Who owns it
None of the long-term investors we follow own it. 51 funds in all.
Largest holders overall
- Winmill$3m
- Vanguard Capital Management$2m
- BlackRock$2mAdded
- Marathon Capital Management$1m
- Private Capital Management$1mAdded
- Renaissance Technologies$1mCut
- Geode Capital Management$750,799
- Wells Fargo & Company$686,011
- Morgan Stanley$407,692Added
- Kestra Advisory Services$351,957Added
From 13F filings for the quarter ended 30 June 2026.
Big holders and activists
1 investor owns more than 5%.
- Mark Campbell WinmillInsider or founderat least 8.4%+1.1 pts(filed with 5 related holders)Since 3 December 2025
What they said
The Reporting Persons acquired the Shares for investment purposes. Notwithstanding any of the foregoing, the Reporting Persons may at any time modify, change, abandon, or replace, some or all of the foregoing purposes and plans and discussions relating thereto or discontinue or…
Read the filing - BARD ASSOCIATES INCPassive investorSold down below 5%Since 13 August 2025
| Holder | Stake | Since | |
|---|---|---|---|
Mark Campbell Winmill Insider or founder | at least 8.4%+1.1 pts (filed with 5 related holders) | 3 December 2025 | What they saidThe Reporting Persons acquired the Shares for investment purposes. Notwithstanding any of the foregoing, the Reporting Persons may at any time modify, change, abandon, or replace, some or all of the foregoing purposes and plans and discussions relating thereto or discontinue or… Read the filing |
BARD ASSOCIATES INC Passive investor | Sold down below 5% | 13 August 2025 |
From Schedule 13D and 13G filings: anyone owning more than 5% must file one.
What insiders did
In the last 12 months, 3 insiders bought $136,655 of shares on the open market.
- WINMILL MARK CAMPBELLPresident and CEO, DirectorBought
- Date
- 10 September 2026
- Shares
- 342
- Price
- $5.16
- Value
- $1,765
- WINMILL MARK CAMPBELLPresident and CEO, DirectorBought
- Date
- 9 September 2026
- Shares
- 3,658
- Price
- $5.16
- Value
- $18,875
- BURKE RUSSELL E IIIDirectorBought
- Date
- 13 August 2026
- Shares
- 1,625
- Price
- $5.21
- Value
- $8,459
- WINMILL MARK CAMPBELLPresident and CEO, DirectorBought
- Date
- 14 May 2026
- Shares
- 4,000
- Price
- $5.33
- Value
- $21,320
- WINMILL MARK CAMPBELLPresident and CEO, DirectorBought
- Date
- 5 December 2025
- Shares
- 4,400
- Price
- $5.08
- Value
- $22,364
- WINMILL MARK CAMPBELLPresident and CEO, DirectorBought
- Date
- 4 December 2025
- Shares
- 6,000
- Price
- $5.14
- Value
- $30,840
- WINMILL MARK CAMPBELLPresident and CEO, DirectorBought
- Date
- 3 December 2025
- Shares
- 6,000
- Price
- $5.13
- Value
- $30,780
- Klimoski Donald IIGeneral CounselBought
- Date
- 2 December 2025
- Shares
- 446
- Price
- $5.05
- Value
- $2,252
| Date | Who | Did | Shares | Price | Value |
|---|---|---|---|---|---|
| 10 September 2026 | WINMILL MARK CAMPBELL President and CEO, Director | Bought | 342 | $5.16 | $1,765 |
| 9 September 2026 | WINMILL MARK CAMPBELL President and CEO, Director | Bought | 3,658 | $5.16 | $18,875 |
| 13 August 2026 | BURKE RUSSELL E III Director | Bought | 1,625 | $5.21 | $8,459 |
| 14 May 2026 | WINMILL MARK CAMPBELL President and CEO, Director | Bought | 4,000 | $5.33 | $21,320 |
| 5 December 2025 | WINMILL MARK CAMPBELL President and CEO, Director | Bought | 4,400 | $5.08 | $22,364 |
| 4 December 2025 | WINMILL MARK CAMPBELL President and CEO, Director | Bought | 6,000 | $5.14 | $30,840 |
| 3 December 2025 | WINMILL MARK CAMPBELL President and CEO, Director | Bought | 6,000 | $5.13 | $30,780 |
| 2 December 2025 | Klimoski Donald II General Counsel | Bought | 446 | $5.05 | $2,252 |
From Form 4 filings: insiders must report trades in their own company's shares within two days.
The deep dive
Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.
- What the business is worth, as a range, and the margin of safety at today’s price
- Prices to start buying, buy, and buy hard
- The three things that would make this a mistake
- Every number footnoted to the filing it came from
Your first deep dive is free.
Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.