Costco Wholesale Corporation (COST) — Insider Trading

Name: Insider Trading Costco Wholesale Corporation (COST) — September 2026
Creator: WhaleSentiment

Sector: Consumer Staples • All Insider Transactions

🔄 Last update: 09/19/2026 at 14:10 UTC

Sales (90d)

$0.8M

1 transactions

Buys (90d)

0 transactions

WhaleSentiment Score ℹ️

🟡 -32

Attenzione

Form 144 Filings

Upcoming sale notices

Stock Price COST 📈

COST stock price — last 6 months

Last Price

$895.31

18/09/2026 (market close)

Daily Change

+1.38 (+0.15%)

6-Month Performance

-7.9%

$971.82 → $895.31

6M High / 6M Low

$1092.58

Min: $893.74

▲ = insider buy (0), ▼ = insider sell (2)

Data from Yahoo Finance, 15-min delay. Last update: 18/09/2026 (market close).

All Insider Transactions COST — 2026

Insider Transactions

Date	Insider	Role	Type	Shares	Price	Value
09/10/2026	Wilcox William Richard	Executive Vice President	Award	4,129	—	—
09/10/2026	Wilcox William Richard	Executive Vice President	Tax	1,934	$902.38	$1.7M
09/10/2026	Rubanenko Yoram	Executive Vice President	Award	4,129	—	—
09/10/2026	Rubanenko Yoram	Executive Vice President	Tax	1,695	$902.38	$1.5M
09/10/2026	Riel Pierre	Executive Vice President	Award	4,552	—	—
09/10/2026	Riel Pierre	Executive Vice President	Tax	1,561	$902.38	$1.4M
09/10/2026	Klauer James C	Executive Vice President	Award	4,129	—	—
09/10/2026	Klauer James C	Executive Vice President	Tax	936	$902.38	$0.8M
09/10/2026	Jones Teresa A.	Executive Vice President	Award	4,129	—	—
09/10/2026	Jones Teresa A.	Executive Vice President	Tax	1,458	$902.38	$1.3M
09/10/2026	Frates Caton	Executive Vice President	Award	4,552	—	—
09/10/2026	Frates Caton	Executive Vice President	Tax	1,654	$902.38	$1.5M
09/10/2026	Adamo Claudine	Executive Vice President	Award	4,129	—	—
09/10/2026	Adamo Claudine	Executive Vice President	Tax	916	$902.38	$0.8M
07/10/2026	RAIKES JEFFREY S	Director	Gift	5,249	—	—
06/23/2026	DENMAN KENNETH D	Director	Sale	885	$957.45	$0.8M

Holdings Summary

Insider	Role	Shares Held	Last Transaction
Klauer James C	Executive Vice President	48,965	09/10/2026
Riel Pierre	Executive Vice President	15,807	09/10/2026
Rubanenko Yoram	Executive Vice President	12,376	09/10/2026
Frates Caton	Executive Vice President	10,367	09/10/2026
Adamo Claudine	Executive Vice President	10,250	09/10/2026
Jones Teresa A.	Executive Vice President	8,056	09/10/2026
Wilcox William Richard	Executive Vice President	6,129	09/10/2026
RAIKES JEFFREY S	Director	6,043	07/10/2026
DENMAN KENNETH D	Director	4,778	06/23/2026

Financial Context

Recent financial data from SEC filings (XBRL) to contextualize insider activity.

Revenue (latest quarter)

$69597M

Period: 2026-02-15

Net Income

$2192M

Profit

Diluted EPS

$4.93

Per share

What is Insider Trading on Costco Wholesale Corporation?

Legal insider trading occurs when executives, directors, and major shareholders (>10%) of a public company buy or sell shares of their own company and report it to the SEC via Form 4.

How to Read the Data

Open market purchases (P) — the strongest signal. The insider uses their own money to buy shares.

Signals to Watch for COST

Cluster buying: multiple Costco Wholesale Corporation insiders buying in the same week → very bullish signal
Excessive selling: selling volume above historical average → possible concern signal
Form 144: filing of a sale notice → imminent sale in the coming days/weeks
10b5-1 Plan: pre-programmed sales are less significant than discretionary sales

Sources & References

All data on this page comes directly from public SEC filings.

📋 View all Form 4 filings on SEC EDGAR COST →

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⚠️ Disclaimer: WhaleSentiment provides public SEC data for informational and educational purposes only. It does not provide financial advice, investment recommendations, or solicitation to buy/sell financial instruments. Always consult a qualified financial advisor before making investment decisions.