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SEC EDGAR - Form 4 insider activity

Costco $COST

Retail - 10 filings indexed by Nortis

Nortis signal thesis

Cluster activity detected. Review whether the filings are open-market trades or routine compensation events.

0

OM buys - 90d

2

OM sells - 90d

8

Routine filings

7

Cluster filings

$2.02M

Largest trade

23/100

Avg signal score

Filing tape

Recent filings

Last 30d: 9
Open-market SellNotable 56/100
filed 2026-09-30
FCOfficer

Frates Caton - Sr. Executive Vice President - $733.3K

Insiders sell for many reasons (diversification, tax, personal); size and clustering matter more than a single sale.

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Open-market SellNotable 62/100
filed 2026-09-30
ACOfficer

Adamo Claudine - Executive Vice President - $2.02M

Insiders sell for many reasons (diversification, tax, personal); size and clustering matter more than a single sale.

View source filing
Grant / AwardCLUSTERRoutine 15/100
filed 2026-09-14
RPOfficer

Riel Pierre - Executive Vice President - -

This is compensation-related stock, not a purchase decision - it should not be read as an open-market buy. It is part of a cluster (3+ insiders within 7 days), which is generally more notable than an isolated filing.

View source filing
Grant / AwardCLUSTERRoutine 15/100
filed 2026-09-14
ACOfficer

Adamo Claudine - Executive Vice President - -

This is compensation-related stock, not a purchase decision - it should not be read as an open-market buy. It is part of a cluster (3+ insiders within 7 days), which is generally more notable than an isolated filing.

View source filing
Grant / AwardCLUSTERRoutine 15/100
filed 2026-09-14
RYOfficer

Rubanenko Yoram - Executive Vice President - -

This is compensation-related stock, not a purchase decision - it should not be read as an open-market buy. It is part of a cluster (3+ insiders within 7 days), which is generally more notable than an isolated filing.

View source filing
Grant / AwardCLUSTERRoutine 15/100
filed 2026-09-14
KCOfficer

Klauer James C - Executive Vice President - -

This is compensation-related stock, not a purchase decision - it should not be read as an open-market buy. It is part of a cluster (3+ insiders within 7 days), which is generally more notable than an isolated filing.

View source filing
Grant / AwardCLUSTERRoutine 15/100
filed 2026-09-14
JAOfficer

Jones Teresa A. - Executive Vice President - -

This is compensation-related stock, not a purchase decision - it should not be read as an open-market buy. It is part of a cluster (3+ insiders within 7 days), which is generally more notable than an isolated filing.

View source filing
Grant / AwardCLUSTERRoutine 15/100
filed 2026-09-14
FCOfficer

Frates Caton - Executive Vice President - -

This is compensation-related stock, not a purchase decision - it should not be read as an open-market buy. It is part of a cluster (3+ insiders within 7 days), which is generally more notable than an isolated filing.

View source filing
Grant / AwardCLUSTERRoutine 15/100
filed 2026-09-14
WROfficer

Wilcox William Richard - Executive Vice President - -

This is compensation-related stock, not a purchase decision - it should not be read as an open-market buy. It is part of a cluster (3+ insiders within 7 days), which is generally more notable than an isolated filing.

View source filing
Gift / TransferRoutine 10/100
filed 2026-07-14
RSBoard

RAIKES JEFFREY S - Director - -

Gifts and transfers are usually estate or charitable planning, not a buy or sell signal.

View source filing