Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Global Self Storage, Inc.

SELF · Nasdaq · CIK 0001031235 · Real Estate · REIT—Specialty

INSIDER SIGNAL

63.6 / 100

3 buyers · 18 purchase transaction lines · $487.2K gross purchase

WHY THIS SIGNAL?

Buyer breadthModerate
Purchase sizeModerate
RoleModerate
RecencyModerate
ConvictionStrong
Score anatomy

Each bar shows the contribution to the current score; the weights and formula stay unchanged.

Cluster+21.0 / 35
Purchase size+14.3 / 25
Role+13.0 / 20
Recency+5.3 / 10
Conviction+10.0 / 10

What is holding the score back?

  • ⚠ Cluster breadth is moderate · 3 insider(s), not 4+
  • ⚠ Role scores low · most senior buyer: President and CEO (CEO, chair and 10% owners score lowest)

Purchase-size comments are relative to the model scale. Average daily volume is a separate market-context diagnostic.

US-v1.2 ranks qualifying equity purchases under the current 180-day rules. The score is a research priority, not a return forecast or probability. Backtests have not shown that a higher US score is followed by better returns.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
WINMILL & CO. INCOther
●●●●●●●●●●●●
WINMILL MARK CAMPBELLPresident and CEO
●●●
BURKE RUSSELL E IIIDirector
○○●
Zachary William ChesterDirector
○○
● Purchase▼ Sale○ Other

—

Purchase breadth & concentration

QUALIFYING BUYERS3
PURCHASE CONCENTRATION90%Largest buyer: WINMILL & CO. INC · $436.8K
CLUSTER BUYING · 15D2 insidersPeak activity: 2026-08-11–2026-08-26

Roles in the peak window: Director, Other. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

63.6 / 100

Latest recorded score

↓ -0.2 ptsversus the previous recorded snapshot
  1. 64.3
  2. 64.1
  3. 64.0
  4. 63.8
  5. 63.6

Only scores saved when a full US scoring run completed are shown; gaps are not reconstructed.

Recent Form 4 activity

37Purchases
0Sales
13Other Form 4 lines
28SEC filings · 365 days
BUYING18 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER4 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-4.9%
3M
-3.4%
6M
-7.0%
12M
-1.6%

Volatility & liquidity

Volatility
19.9%
Beta
—
Avg daily value
USD 159,499

Valuation

Market cap
USD 56.0M
P/E
27.5×

Fundamentals

Profit margin
16.0%
ROE
4.4%
Industry
REIT—Specialty

Market data

Price data up to: 2026-10-11 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: Market cap, P/E, Profit margin, ROE · Fiscal year ended: 2025-12-31 · Market cap is the shares outstanding stated on the filing cover multiplied by the latest close. Share count date: 2026-08-06 · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
28,805
Previous report
16,728
Avg daily volume
49,836
Days to cover
≤ 1.0

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-10WINMILL MARK CAMPBELLPurchase (P)Common Stock342USD 5.16USD 1,765SEC filing ↗
2026-09-09WINMILL MARK CAMPBELLPurchase (P)Common Stock3,658USD 5.16USD 18,875SEC filing ↗
2026-08-26WINMILL & CO. INCPurchase (P)Common Stock7,761USD 5.64USD 43,772SEC filing ↗
2026-08-25WINMILL & CO. INCPurchase (P)Common Stock7,547USD 5.66USD 42,716SEC filing ↗
2026-08-24WINMILL & CO. INCPurchase (P)Common Stock8,022USD 5.62USD 45,084SEC filing ↗
2026-08-21WINMILL & CO. INCPurchase (P)Common Stock7,117USD 5.45USD 38,788SEC filing ↗
2026-08-20WINMILL & CO. INCPurchase (P)Common Stock6,901USD 5.42USD 37,403SEC filing ↗
2026-08-19WINMILL & CO. INCPurchase (P)Common Stock6,877USD 5.40USD 37,136SEC filing ↗
2026-08-18WINMILL & CO. INCPurchase (P)Common Stock5,736USD 5.32USD 30,516SEC filing ↗
2026-08-17WINMILL & CO. INCPurchase (P)Common Stock7,117USD 5.33USD 37,934SEC filing ↗
2026-08-14WINMILL & CO. INCPurchase (P)Common Stock6,029USD 5.23USD 31,532SEC filing ↗
2026-08-13WINMILL & CO. INCPurchase (P)Common Stock5,629USD 5.20USD 29,271SEC filing ↗
2026-08-13BURKE RUSSELL E IIIPurchase (P)Common Stock1,625USD 5.21USD 8,466SEC filing ↗
2026-08-12WINMILL & CO. INCPurchase (P)Common Stock6,248USD 5.15USD 32,177SEC filing ↗
2026-08-11WINMILL & CO. INCPurchase (P)Common Stock5,887USD 5.17USD 30,436SEC filing ↗

Form 4 evidence

50 transaction lines in the latest 365-day window; 206 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-10WINMILL MARK CAMPBELLPurchase (P)Common Stock342USD 5.16USD 1,765SEC filing ↗
2026-09-09WINMILL MARK CAMPBELLPurchase (P)Common Stock3,658USD 5.16USD 18,875SEC filing ↗
2026-08-26WINMILL & CO. INCPurchase (P)Common Stock7,761USD 5.64USD 43,772SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-10WINMILL MARK CAMPBELLPurchase (P)Common Stock342USD 5.16USD 1,765SEC filing ↗
2026-09-09WINMILL MARK CAMPBELLPurchase (P)Common Stock3,658USD 5.16USD 18,875SEC filing ↗
2026-08-26WINMILL & CO. INCPurchase (P)Common Stock7,761USD 5.64USD 43,772SEC filing ↗
2026-08-25WINMILL & CO. INCPurchase (P)Common Stock7,547USD 5.66USD 42,716SEC filing ↗
2026-08-24WINMILL & CO. INCPurchase (P)Common Stock8,022USD 5.62USD 45,084SEC filing ↗
2026-08-21WINMILL & CO. INCPurchase (P)Common Stock7,117USD 5.45USD 38,788SEC filing ↗
2026-08-20WINMILL & CO. INCPurchase (P)Common Stock6,901USD 5.42USD 37,403SEC filing ↗
2026-08-19WINMILL & CO. INCPurchase (P)Common Stock6,877USD 5.40USD 37,136SEC filing ↗
2026-08-18WINMILL & CO. INCPurchase (P)Common Stock5,736USD 5.32USD 30,516SEC filing ↗
2026-08-17WINMILL & CO. INCPurchase (P)Common Stock7,117USD 5.33USD 37,934SEC filing ↗
2026-08-14WINMILL & CO. INCPurchase (P)Common Stock6,029USD 5.23USD 31,532SEC filing ↗
2026-08-13WINMILL & CO. INCPurchase (P)Common Stock5,629USD 5.20USD 29,271SEC filing ↗
2026-08-13BURKE RUSSELL E IIIPurchase (P)Common Stock1,625USD 5.21USD 8,466SEC filing ↗
2026-08-12WINMILL & CO. INCPurchase (P)Common Stock6,248USD 5.15USD 32,177SEC filing ↗
2026-08-11Zachary William ChesterAward / grant (A)Common Stock196USD 5.10USD 1,000SEC filing ↗
2026-08-11BURKE RUSSELL E IIIAward / grant (A)Common Stock196USD 5.10USD 1,000SEC filing ↗
2026-08-11WINMILL & CO. INCPurchase (P)Common Stock5,887USD 5.17USD 30,436SEC filing ↗
2026-05-14WINMILL MARK CAMPBELLPurchase (P)Common Stock4,000USD 5.33USD 21,320SEC filing ↗
2026-05-12Zachary William ChesterAward / grant (A)Common Stock94USD 5.31USD 499SEC filing ↗
2026-05-12BURKE RUSSELL E IIIAward / grant (A)Common Stock94USD 5.31USD 499SEC filing ↗
2026-03-24WINMILL MARK CAMPBELLAward / grant (A)Common Stock25,344USD 5.09USD 129,001SEC filing ↗
2026-03-24OMalley ThomasAward / grant (A)Common Stock11,054USD 5.09USD 56,265SEC filing ↗
2026-03-24Klimoski Donald IIAward / grant (A)Common Stock11,054USD 5.09USD 56,265SEC filing ↗
2026-03-24Kamerman RussellAward / grant (A)Common Stock500USD 5.10USD 2,550SEC filing ↗
2025-12-05WINMILL MARK CAMPBELLPurchase (P)Common Stock4,400USD 5.08USD 22,364SEC filing ↗
2025-12-04WINMILL MARK CAMPBELLPurchase (P)Common Stock6,000USD 5.14USD 30,840SEC filing ↗
2025-12-03WINMILL MARK CAMPBELLPurchase (P)Common Stock6,000USD 5.13USD 30,780SEC filing ↗
2025-12-02Klimoski Donald IIPurchase (P)Common Stock446USD 5.05USD 2,252SEC filing ↗
2025-12-01WINMILL & CO. INCPurchase (P)Common Stock3,062USD 5.18USD 15,861SEC filing ↗
2025-11-28WINMILL & CO. INCPurchase (P)Common Stock3,342USD 5.16USD 17,245SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerSELF
CIK0001031235
SectorReal Estate
IndustryREIT—Specialty Yahoo Finance
SEC SIC6798 Real Estate Investment Trusts
ExchangeNasdaq

Data coverage

Local Form 4 history206 transaction lines from 2020-03-26 to 2026-09-10
128 P purchase lines · 2 S sale lines · 76 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.