Reporting owner · CIK 0001019264
Winmill Mark Campbell
Visual SEC Form 4 history across 1 companies, 6 transactions and 2 filings.
PRESPresident and CEOGlobal Self Storage, Inc.
Open-market mix
100%buys
Open-market buy performance
90-day forward return on this insider's open-market purchases
For every open-market buy (Form 4 code P, acquisition A) in the selected window, we take the closing price on the transaction date and 90 calendar days later, then compute the percentage change. The figures shown are the simple average and median of those per-buy returns.
- Window follows the rest of the summary (all-history or last 3 months).
- Only buys with a resolved price context are counted.
- Includes both positive and negative outcomes; gains and losses net out at the per-buy level.
Monthly open-market activity
Reported purchase and sale transaction counts
Buys Sells
Net value flow
Buys minus sells
Mar 26
$0
Sep 26
$20.6K
Transaction texture
Ownership and ticket size
Average P/S size$5.2K
Median P/S size$4.9K
Direct6
Indirect0
Sep 10, 2026buy
Filing-only signals
Deterministic matches in this insider's history
Latest Form 4 facts
Quick context from source filings
Latest transaction
buy at Global Self Storage, Inc. on Sep 10, 2026 valued at $1,507.
Review SEC filingLatest sale
No open-market insider sale is available.
Associated companies
Visual map of known reporting history
| 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 MARK CAMPBELL | PRES | grant | 12.6k | $6.46M | A | +0.4% | 03/25 | 03/24 | |
| SELF | WINMILL MARK CAMPBELL | PRES | grant | 12.6k | $6.43M | A | +0.4% | 03/25 | 03/24 |
Winmill Mark Campbell Insider Activity FAQ
SEC Form 4 context
Who is Winmill Mark Campbell?
Winmill Mark Campbell is a reporting owner in SEC Form 4 filings with reporting owner CIK 0001019264.
Which companies has Winmill Mark Campbell reported transactions for?
Global Self Storage, Inc.
When was Winmill Mark Campbell's latest insider buy?
buy at Global Self Storage, Inc. on Sep 10, 2026 valued at $1,507.
When was Winmill Mark Campbell's latest insider sale?
No open-market insider sale is available for this period.
Where can I see the original SEC filings?
Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.
Are performance metrics included?
This version does not calculate win rates, forward returns, benchmark-adjusted returns, or high-conviction scores.