Observatory · observe first
S&P Global
SPGI · United States · Financial Exchanges & Data · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.281%
12M weight contribution
-0.075 pp
3M weight contribution
-0.048 pp
12M price return
-5.1%
Share of matched S&P 500 members
Monthly observations through Sep 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 |
|---|---|---|---|---|---|
| Sep 2025 | $140.6bn | 0.281% | -0.075 pp | -5.1% | No |
| Aug 2025 | $158.4bn | 0.328% | -0.039 pp | +7.6% | No |
| Jul 2025 | $159.9bn | 0.337% | +0.080 pp | +14.5% | No |
| Jun 2025 | $153.0bn | 0.330% | +0.082 pp | +19.1% | No |
| May 2025 | $148.8bn | 0.337% | +0.095 pp | +20.8% | No |
| Apr 2025 | $145.1bn | 0.348% | -0.008 pp | +21.2% | Yes |
| Mar 2025 | $149.2bn | 0.354% | +0.004 pp | +20.3% | Yes |
| Feb 2025 | $156.7bn | 0.350% | -0.014 pp | +25.5% | Yes |
| Jan 2025 | $153.1bn | 0.340% | -0.059 pp | +17.2% | No |
| Dec 2024 | $146.2bn | 0.332% | -0.062 pp | +13.9% | Yes |
| Nov 2024 | $153.4bn | 0.338% | -0.050 pp | +26.6% | Yes |
| Oct 2024 | $141.0bn | 0.331% | -0.026 pp | +38.6% | Yes |
| Sep 2024 | $153.0bn | 0.356% | -0.011 pp | +42.5% | Yes |
| Aug 2024 | $152.0bn | 0.367% | -0.008 pp | +32.4% | Yes |
| Jul 2024 | $143.5bn | 0.257% | -0.002 pp | +23.9% | No |
| Jun 2024 | $132.0bn | 0.247% | -0.034 pp | +12.2% | No |
| May 2024 | $126.6bn | 0.242% | -0.034 pp | +17.4% | No |
| Apr 2024 | $123.1bn | 0.357% | -0.015 pp | +15.7% | No |
| Mar 2024 | $126.4bn | 0.351% | -0.008 pp | +24.5% | No |
| Feb 2024 | $127.3bn | 0.365% | -0.001 pp | +26.7% | No |
| Jan 2024 | $134.4bn | 0.400% | +0.004 pp | +20.7% | Yes |
| Dec 2023 | $132.0bn | 0.394% | +0.021 pp | +32.8% | Yes |
| Nov 2023 | $124.6bn | 0.389% | +0.020 pp | +19.0% | Yes |
| Oct 2023 | $105.2bn | 0.357% | +0.006 pp | +9.8% | 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.