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

ESS Tech, Inc.

GWH · NYSE; OTC · CIK 0001819438 · Industrials

INSIDER SIGNAL

28.5 / 100

1 buyers · 1 purchase transaction lines · $25.8K gross purchase

WHY THIS SIGNAL?

Buyer breadthLow
Purchase sizeLow
RoleModerate
RecencyLow
ConvictionModerate
Score anatomy

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

Cluster+7.0 / 35
Purchase size+2.1 / 25
Role+13.0 / 20
Recency+1.0 / 10
Conviction+5.4 / 10

What is holding the score back?

  • ⚠ Cluster breadth is moderate · 1 insider(s), not 4+
  • ⚠ Purchase size is modest relative to the model scale
  • ⚠ Role scores low · most senior buyer: CEO (CEO, chair and 10% owners score lowest)
  • ⚠ Purchase activity is becoming less recent
  • ⚠ Buying conviction is reduced by concurrent selling

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
Suhadolnik Kate EileenChief Financial Officer
▼▼▼
Goodman Kelly F.SEE REMARKS
▼▼▼
Buckley Drew PCEO
●
WELLMAN ALEXIDirector
○
Quarls HarryDirector
○
Nijhawan SandeepDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 2 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: Buckley Drew P · $25.8K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-06-04–2026-06-04

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

SIGNAL HISTORY

28.5 / 100

Latest recorded score

↓ -0.1 ptsversus the previous recorded snapshot
  1. 28.6
  2. 28.6
  3. 28.6
  4. 28.6
  5. 28.5

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

Recent Form 4 activity

1Purchases
8Sales
9Other Form 4 lines
16SEC filings · 365 days
BUYING1 qualifying P line(s) · 180 days
SELLING6 sale line(s) · context only
OTHER5 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
-71.4%
3M
—
6M
—
12M
—

Volatility & liquidity

Volatility
159.7%
Beta
—
Avg daily value
USD 119,350

Valuation

Market cap
USD 3.6M
P/E
0.1×

Fundamentals

Profit margin
—
ROE
736.1%
Industry
Miscellaneous Electrical Machinery, Equipment & Supplies

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, 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
2,145,222
Previous report
2,428,614
Avg daily volume
1,614,775
Days to cover
1.3

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
2026-06-04Buckley Drew PPurchase (P)Common Stock25,000USD 1.03USD 25,750SEC filing ↗
2024-11-18Dresselhuys Eric P.Purchase (P)Common Stock1,000USD 5.23USD 5,230SEC filing ↗
2024-08-30Teamey KylePurchase (P)Common Stock142USD 6.73USD 956SEC filing ↗
2024-05-14Teamey KylePurchase (P)Common Stock1,250USD 0.79USD 988SEC filing ↗
2024-05-10Quarls HarryPurchase (P)Common Stock57,310USD 0.79USD 45,275SEC filing ↗
2024-05-09Quarls HarryPurchase (P)Common Stock42,690USD 0.84USD 35,860SEC filing ↗
2024-03-15Hossfeld RichPurchase (P)Common Stock2,500USD 0.73USD 1,825SEC filing ↗
2023-11-16Quarls HarryPurchase (P)Common Stock5,489USD 1.25USD 6,861SEC filing ↗
2023-11-15Quarls HarryPurchase (P)Common Stock67,118USD 1.35USD 90,609SEC filing ↗
2023-11-14Quarls HarryPurchase (P)Common Stock80,579USD 1.27USD 102,335SEC filing ↗
2023-11-13Teamey KylePurchase (P)Common Stock1,000USD 1.11USD 1,110SEC filing ↗
2023-11-13Quarls HarryPurchase (P)Common Stock46,814USD 1.10USD 51,495SEC filing ↗
2023-05-16NIGGLI MICHAEL RPurchase (P)Common Stock10,000USD 0.81USD 8,100SEC filing ↗
2023-05-16Hossfeld RichPurchase (P)Common Stock10,000USD 0.81USD 8,100SEC filing ↗
2023-05-15Teamey KylePurchase (P)Common Stock4,000USD 0.84USD 3,360SEC filing ↗

Form 4 evidence

18 transaction lines in the latest 365-day window; 151 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-21Suhadolnik Kate EileenSale (S)Common Stock3,927USD 0.40USD 1,571SEC filing ↗
2026-08-21Goodman Kelly F.Sale (S)Common Stock5,400USD 0.40USD 2,160SEC filing ↗
2026-06-04Buckley Drew PPurchase (P)Common Stock25,000USD 1.03USD 25,750SEC filing ↗
Show recent Form 4 evidence (18 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-21Suhadolnik Kate EileenSale (S)Common Stock3,927USD 0.40USD 1,571SEC filing ↗
2026-08-21Goodman Kelly F.Sale (S)Common Stock5,400USD 0.40USD 2,160SEC filing ↗
2026-06-04Buckley Drew PPurchase (P)Common Stock25,000USD 1.03USD 25,750SEC filing ↗
2026-05-29WELLMAN ALEXIAward / grant (A)Common Stock13,513USD 0.00USD 0SEC filing ↗
2026-05-29Quarls HarryAward / grant (A)Common Stock13,513USD 0.00USD 0SEC filing ↗
2026-05-29Nijhawan SandeepAward / grant (A)Common Stock13,513USD 0.00USD 0SEC filing ↗
2026-05-29Hossfeld RichAward / grant (A)Common Stock13,513USD 0.00USD 0SEC filing ↗
2026-05-29Garabedian RaffiAward / grant (A)Common Stock13,513USD 0.00USD 0SEC filing ↗
2026-05-22Suhadolnik Kate EileenSale (S)Common Stock1,922USD 0.93USD 1,787SEC filing ↗
2026-05-22Goodman Kelly F.Sale (S)Common Stock2,751USD 0.93USD 2,558SEC filing ↗
2026-05-21Suhadolnik Kate EileenSale (S)Common Stock1,735USD 0.92USD 1,596SEC filing ↗
2026-05-21Goodman Kelly F.Sale (S)Common Stock2,482USD 0.92USD 2,283SEC filing ↗
2026-02-20Suhadolnik Kate EileenSale (S)Common Stock741USD 1.54USD 1,141SEC filing ↗
2026-02-20Goodman Kelly F.Sale (S)Common Stock2,269USD 1.54USD 3,494SEC filing ↗
2026-02-13Suhadolnik Kate EileenAward / grant (A)Common Stock137,500USD 0.00USD 0SEC filing ↗
2026-02-13Goodman Kelly F.Award / grant (A)Common Stock137,500USD 0.00USD 0SEC filing ↗
2025-11-20Suhadolnik Kate EileenTax withholding (F)Common Stock1,299USD 2.40USD 3,118SEC filing ↗
2025-11-20Goodman Kelly F.Tax withholding (F)Common Stock4,513USD 2.40USD 10,831SEC 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 · —
TickerGWH
CIK0001819438
SectorIndustrials
Industry— Yahoo Finance
SEC SIC3690 Miscellaneous Electrical Machinery, Equipment & Supplies
ExchangeNYSE; OTC

Data coverage

Local Form 4 history151 transaction lines from 2021-10-08 to 2026-08-21
22 P purchase lines · 27 S sale lines · 102 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.