Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-19 · Built: 2026-10-19 · 中文

← United States · Coverage record

US · SEC FORM 4

COSTCO WHOLESALE CORP /NEW

COST · Nasdaq · CIK 0000909832 · Consumer Defensive · Discount Stores

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

19 Form 4 transaction lines observed in the same window
4 sales · 15 option, withholding, award, gift or other lines

Last qualifying purchase2022-06-07 · Wilderotter Mary Agnes · $400.1K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesModerate
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

Insider activity timeline

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

AprMayJunJulAugSepOct
Frates CatonSr. Executive Vice President
○○▼
Adamo ClaudineExecutive Vice President
○○▼
Wilcox William RichardExecutive Vice President
○○▼
Rubanenko YoramExecutive Vice President
○○
Riel PierreExecutive Vice President
○○
Klauer James CExecutive Vice President
○○
● Purchase▼ Sale○ Other

Showing the six most active owners; 3 additional owner(s) remain in Form 4 evidence.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2022-06-07 · Wilderotter Mary Agnes.

Recent Form 4 activity

0Purchases
15Sales
73Other Form 4 lines
45SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING4 sale line(s) · context only
OTHER15 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 has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

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

Shares short
7,325,824
Previous report
7,360,574
Avg daily volume
2,675,021
Days to cover
2.7

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
2022-06-07Wilderotter Mary AgnesPurchase (P)Common Stock850USD 470.74USD 400,129SEC filing ↗
2022-01-07JAMES HAMILTON EPurchase (P)Common Stock461USD —USD —SEC filing ↗
2021-12-21Wilderotter Mary AgnesPurchase (P)Common Stock925USD 540.13USD 499,620SEC filing ↗

Form 4 evidence

88 transaction lines in the latest 365-day window; 637 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-13Wilcox William RichardSale (S)Common Stock1,100USD 958.21USD 1,054,026SEC filing ↗
2026-09-29Frates CatonSale (S)Common Stock801USD 915.93USD 733,330SEC filing ↗
2026-09-29Adamo ClaudineSale (S)Common Stock2,200USD 915.93USD 2,015,046SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-13Wilcox William RichardSale (S)Common Stock1,100USD 958.21USD 1,054,026SEC filing ↗
2026-09-29Frates CatonSale (S)Common Stock801USD 915.93USD 733,330SEC filing ↗
2026-09-29Adamo ClaudineSale (S)Common Stock2,200USD 915.93USD 2,015,046SEC filing ↗
2026-09-10Wilcox William RichardTax withholding (F)Common Stock1,935USD 902.38USD 1,745,753SEC filing ↗
2026-09-10Wilcox William RichardAward / grant (A)Common Stock4,129USD 0.00USD 0SEC filing ↗
2026-09-10Rubanenko YoramTax withholding (F)Common Stock1,696USD 902.38USD 1,530,391SEC filing ↗
2026-09-10Rubanenko YoramAward / grant (A)Common Stock4,129USD 0.00USD 0SEC filing ↗
2026-09-10Riel PierreTax withholding (F)Common Stock1,562USD 902.38USD 1,409,211SEC filing ↗
2026-09-10Riel PierreAward / grant (A)Common Stock4,552USD 0.00USD 0SEC filing ↗
2026-09-10Klauer James CTax withholding (F)Common Stock936USD 902.38USD 844,736SEC filing ↗
2026-09-10Klauer James CAward / grant (A)Common Stock4,129USD 0.00USD 0SEC filing ↗
2026-09-10Jones Teresa A.Tax withholding (F)Common Stock1,459USD 902.38USD 1,316,157SEC filing ↗
2026-09-10Jones Teresa A.Award / grant (A)Common Stock4,129USD 0.00USD 0SEC filing ↗
2026-09-10Frates CatonTax withholding (F)Common Stock1,654USD 902.38USD 1,492,861SEC filing ↗
2026-09-10Frates CatonAward / grant (A)Common Stock4,552USD 0.00USD 0SEC filing ↗
2026-09-10Adamo ClaudineTax withholding (F)Common Stock917USD 902.38USD 827,203SEC filing ↗
2026-09-10Adamo ClaudineAward / grant (A)Common Stock4,129USD 0.00USD 0SEC filing ↗
2026-07-10RAIKES JEFFREY SGift (G)Common Stock5,249USD 0.00USD 0SEC filing ↗
2026-06-23DENMAN KENNETH DSale (S)Common Stock885USD 957.45USD 847,343SEC filing ↗
2026-04-01Frates CatonSale (S)Common Stock700USD 993.00USD 695,100SEC filing ↗
2026-03-12George Sarah CatherineI (I)Common Stock642USD 991.21USD 636,486SEC filing ↗
2026-03-11MILLERCHIP GARYTax withholding (F)Common Stock1,154USD 992.23USD 1,145,053SEC filing ↗
2026-03-09Adamo ClaudineSale (S)Common Stock730USD 1,003.02USD 732,205SEC filing ↗
2026-01-27RAIKES JEFFREY SGift (G)Common Stock5,115USD 0.00USD 0SEC filing ↗
2026-01-27Jones Teresa A.Gift (G)Common Stock300USD 0.00USD 0SEC filing ↗
2026-01-21Jones Teresa A.Sale (S)Common Stock850USD 986.26USD 838,321SEC filing ↗
2026-01-16Raimondo Gina MarieAward / grant (A)Common Stock215USD 0.00USD 0SEC filing ↗
2026-01-16DECKER SUSAN LSale (S)Common Stock458USD 955.00USD 437,390SEC filing ↗
2026-01-14Klauer James CSale (S)Common Stock1,500USD 939.00USD 1,408,500SEC filing ↗
2026-01-09Miller Russell DSale (S)Common Stock1,500USD 916.32USD 1,374,480SEC 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 date2026-10-19
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerCOST
CIK0000909832
SectorConsumer Defensive
IndustryDiscount Stores Yahoo Finance
SEC SIC5331 Retail-Variety Stores
ExchangeNasdaq

Data coverage

Local Form 4 history637 transaction lines from 2020-01-10 to 2026-10-13
3 P purchase lines · 132 S sale lines · 502 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-19. Mapping status is an audit field and does not erase SEC filing evidence.