Latest filingSep 11, 2026Most recent Form 4
SELF
Global Self Storage, Inc.
NasdaqFinancialsReal Estate Investment Trusts
Insider activity for last month from 08/12 to 09/12. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$33.3M12 buys
Total selling$00 sells
Net open-market+$33.3M2 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period12transactions
- P · Open-market buys · dominant12 · 100%
Activity by reported role
A joint filing can contribute to multiple roles12transactions
- SER · dominant8 · 67%
- PRES4 · 33%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (1)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeWinmill & Co. IncCommon Stock · Direct
228,512Aug 26, 2026
Winmill Mark CampbellCommon Stock · Direct
372,582.289Sep 10, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 12 → Sep 12
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Top insiders
By absolute net value across the selected period- WI+$226.9k
- WC+$20.6k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
SELF transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| SELF | WINMILL MARK CAMPBELL | PRES | buy | 292 | $150k | P | — | 0.0% | 09/11 | 09/10 |
| SELF | WINMILL MARK CAMPBELL | PRES | buy | 50 | $25.8k | P | — | 0.0% | 09/11 | 09/10 |
| SELF | WINMILL MARK CAMPBELL | PRES | buy | 2.05k | $1.06M | P | — | 0.0% | 09/11 | 09/09 |
| SELF | WINMILL MARK CAMPBELL | PRES | buy | 1.60k | $825k | P | — | 0.0% | 09/11 | 09/09 |
| SELF | WINMILL & CO. INC | SER | buy | 8.02k | $4.50M | P | −0.2% | 08/24 | 08/24 | |
| SELF | WINMILL & CO. INC | SER | buy | 7.11k | $3.88M | P | −0.2% | 08/24 | 08/21 | |
| SELF | WINMILL & CO. INC | SER | buy | 6.90k | $3.74M | P | −5.4% | 08/20 | 08/20 | |
| SELF | WINMILL & CO. INC | SER | buy | 6.87k | $3.71M | P | −5.4% | 08/20 | 08/19 | |
| SELF | WINMILL & CO. INC | SER | buy | 5.73k | $3.05M | P | −3.5% | 08/18 | 08/18 | |
| SELF | WINMILL & CO. INC | SER | buy | 7.11k | $3.79M | P | −3.5% | 08/18 | 08/17 |
Global Self Storage, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Global Self Storage, Inc.?
WINMILL MARK CAMPBELL, WINMILL & CO. INC.
When was the latest reported open-market purchase?
Winmill Mark Campbell reported a buy on Sep 10, 2026 valued at $150k. Read the SEC filing.
When was the latest reported open-market sale?
No code-S sale is available for this period.
What is the recent purchase and sale balance?
Net open-market buying in the selected period was $333,965.38. This describes filed transactions, not a bullish rating.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.