What is Costco Wholesale's shares (diluted)?

Costco Wholesale (COST) reported shares (diluted) of 444.5M in Q4 2025.

How has Costco Wholesale's shares (diluted) changed year-over-year?

Costco Wholesale's shares (diluted) decreased by 0.1% year-over-year, from 444.9M to 444.5M.

What does shares (diluted) mean?

The total number of shares that would exist if all promised stock options were handed out.

Discontinued — last reported Q3 '25

Shares (Diluted)

Costco Wholesale Shares (Diluted) decreased by 0.1% to 444.5M in Q4 2025 compared to the prior quarter. Year-over-year, this metric declined by 0.1%, from 444.9M to 444.5M. This is a positive signal — lower values indicate better performance for this metric.

Analysis

StatementIncome Statement

SectionEarnings Per Share

CategoryCapital Allocation

SignalLower is better

VolatilityStable

First reportedQ1 2007

Last reportedQ3 2025

How to read this metric

A significant increase relative to basic shares indicates a high level of employee stock compensation or outstanding convertible debt.

Detailed definition

The total number of shares that would be outstanding if all 'in-the-money' options, warrants, and convertible instrument...

Peer comparison

Investors compare this to the basic share count to assess how much current ownership might be 'watered down' by future share issuances.

Metric ID: is_weighted_shares_diluted

Historical Data

14 periods

	Q2 '21	Q4 '21	Q1 '22	Q2 '22	Q4 '22	Q1 '23	Q2 '23	Q4 '23	Q1 '24	Q2 '24	Q4 '24	Q1 '25	Q2 '25	Q4 '25
Value	444.1M	444.6M	444.9M	444.9M	444.5M	444.5M	444.4M	444.4M	444.8M	444.8M	444.9M	444.9M	444.8M	444.5M
QoQ Change	—	+0.1%	+0.1%	-0.0%	-0.1%	-0.0%	-0.0%	+0.0%	+0.1%	+0.0%	+0.0%	-0.0%	-0.0%	-0.1%
YoY Change	—	—	—	+0.2%	-0.0%	-0.1%	-0.1%	-0.0%	+0.1%	+0.1%	+0.1%	+0.0%	-0.0%	-0.1%

Range444.1M – 444.9M

CAGR+0.0%

Avg YoY Growth+0.0%

Median YoY Growth-0.0%

Current Streak3 quarters decline

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Frequently Asked Questions

What is Costco Wholesale's shares (diluted)?: Costco Wholesale (COST) reported shares (diluted) of 444.5M in Q4 2025.
How has Costco Wholesale's shares (diluted) changed year-over-year?: Costco Wholesale's shares (diluted) decreased by 0.1% year-over-year, from 444.9M to 444.5M.
What does shares (diluted) mean?: The total number of shares that would exist if all promised stock options were handed out.