Costco

COST · United States

Costco traded $2.1B on 23 Oct 2026, 1.0× its 20-session average. Sector: Commerce & Consumer Platforms.

504 trading days of history, to 2026-10-23 · all values converted to USD

Last close

$1,003.32

23 Oct

1-day change

-1.5%

vs previous close

Market cap

$444.7B

as of 23 Oct

Turnover

0.48%

of market cap traded

Dollar volume

$2.1B

as of 23 Oct

vs prior 20 sessions

1.0×

as of 23 Oct

Share of market volume

0.54%

as of 23 Oct

Volatility

20.7%

annualised

Infinity volume insights

since 14 April 2025

Every session our rules flagged for this company since 14 April 2025: 8. Those marked “In the feed” were published in the daily feed at the time; the rest are computed with the rules in use now. The feed shows a few a day across every market, so most never appear there. We began tracking this company on 6 September 2026; findings before then are marked “Before we tracked it”: it traded that way, and we were not yet watching.

2026-09-25In the feed
Costco moved +2.93% on 2.13× its average dollar volume
2.2 standard deviations from its usual daily change (standard deviation 1.30% across 503 earlier sessions). $4.27B against a 20-day average of $2.01B, on a rising price (+2.93%).

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Volume by window

	Dollar volume	vs prior 20 sessions
Last session	$2.1B	1.0×
Week	For members · Sign in
Month

Sessions to 23 Oct.

Infinity sector: Commerce & Consumer PlatformsBased on 249 companies, 79.2% of the S&P 500's trading.

Price and dollar volume

Bars coloured by direction

The last three months, one point a week (the week's last close and its total dollar volume).

How these are measured

Turnover: — dollar volume over market cap; how hard this name is traded relative to its size.
Vs prior 20 sessions: — above 1 means heavier trading than in the 20 sessions before it.
Share of market volume: — of the 250 names tracked in United States, not the whole market.
Volatility: — from daily returns over the held history. Indicative, not a risk model.
Market cap: — the latest session's close × shares outstanding, in USD. Each day in the history has its own, from that day's close; the share count is refreshed monthly.

Prices and volume via the daily pipeline, converted to USD.

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