Universe›Consumer Staples›Consumer Staples Merchandise Retail›Consumer Staples Merchandise Retail›Costco
Observatory · observe first
Costco
COST · United States · Consumer Staples Merchandise Retail · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.750%
12M weight contribution
-0.173 pp
3M weight contribution
-0.072 pp
12M price return
-5.4%
Share of matched S&P 500 members
Monthly observations through Dec 2025
Company price index
A separate dimension from market allocation
Historical observations
Most recent 24 observations at or before the selected month
| Month | Market cap | Universe weight | 12M weight change | 12M return | Above 6M weight average |
|---|---|---|---|---|---|
| Dec 2025 | $382.8bn | 0.750% | -0.173 pp | -5.4% | No |
| Nov 2025 | $404.9bn | 0.795% | -0.155 pp | -5.5% | No |
| Oct 2025 | $403.9bn | 0.791% | -0.119 pp | +4.9% | No |
| Sep 2025 | $410.5bn | 0.822% | -0.093 pp | +4.9% | No |
| Aug 2025 | $418.3bn | 0.867% | -0.089 pp | +6.3% | No |
| Jul 2025 | $416.7bn | 0.879% | +0.226 pp | +14.7% | No |
| Jun 2025 | $439.0bn | 0.947% | +0.240 pp | +17.1% | No |
| May 2025 | $461.5bn | 1.046% | +0.359 pp | +29.1% | Yes |
| Apr 2025 | $441.2bn | 1.060% | +0.131 pp | +38.1% | Yes |
| Mar 2025 | $419.6bn | 0.996% | +0.095 pp | +29.8% | Yes |
| Feb 2025 | $465.5bn | 1.041% | +0.095 pp | +41.7% | Yes |
| Jan 2025 | $435.0bn | 0.967% | +0.050 pp | +41.8% | Yes |
| Dec 2024 | $406.7bn | 0.922% | +0.049 pp | +39.6% | Yes |
| Nov 2024 | $430.6bn | 0.950% | +0.132 pp | +68.7% | Yes |
| Oct 2024 | $387.3bn | 0.910% | +0.079 pp | +62.9% | Yes |
| Sep 2024 | $393.0bn | 0.915% | +0.079 pp | +61.5% | Yes |
| Aug 2024 | $395.6bn | 0.956% | +0.180 pp | +67.2% | Yes |
| Jul 2024 | $364.4bn | 0.653% | +0.112 pp | +51.2% | No |
| Jun 2024 | $376.8bn | 0.706% | +0.155 pp | +62.6% | No |
| May 2024 | $359.2bn | 0.687% | +0.126 pp | +63.0% | No |
| Apr 2024 | $320.6bn | 0.929% | +0.175 pp | +48.2% | Yes |
| Mar 2024 | $324.9bn | 0.901% | +0.149 pp | +51.9% | Yes |
| Feb 2024 | $330.1bn | 0.946% | +0.191 pp | +58.3% | Yes |
| Jan 2024 | $308.3bn | 0.917% | +0.141 pp | +40.1% | Yes |
Its weight is estimated market cap divided by the total estimated market cap of matched S&P 500 members for the month. This is not an official float-adjusted S&P index weight.