Observatory · observe first
Ameren
AEE · United States · Multi-Utilities · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.053%
12M weight contribution
-0.001 pp
3M weight contribution
-0.004 pp
12M price return
+15.3%
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 | $27.0bn | 0.053% | -0.001 pp | +15.3% | No |
| Nov 2025 | $28.8bn | 0.057% | +0.001 pp | +16.0% | Yes |
| Oct 2025 | $27.6bn | 0.054% | -0.001 pp | +20.6% | No |
| Sep 2025 | $28.2bn | 0.057% | +0.002 pp | +22.9% | No |
| Aug 2025 | $27.0bn | 0.056% | +0.003 pp | +24.6% | No |
| Jul 2025 | $27.3bn | 0.058% | +0.020 pp | +31.4% | No |
| Jun 2025 | $26.0bn | 0.056% | +0.020 pp | +39.2% | No |
| May 2025 | $26.2bn | 0.059% | +0.022 pp | +36.3% | No |
| Apr 2025 | $26.8bn | 0.064% | +0.007 pp | +38.7% | Yes |
| Mar 2025 | $27.1bn | 0.064% | +0.010 pp | +40.1% | Yes |
| Feb 2025 | $27.4bn | 0.061% | +0.007 pp | +47.6% | Yes |
| Jan 2025 | $25.1bn | 0.056% | +0.002 pp | +40.1% | Yes |
| Dec 2024 | $23.8bn | 0.054% | -0.003 pp | +27.5% | Yes |
| Nov 2024 | $25.2bn | 0.056% | -0.008 pp | +25.9% | Yes |
| Oct 2024 | $23.2bn | 0.055% | -0.013 pp | +19.1% | Yes |
| Sep 2024 | $23.3bn | 0.054% | -0.011 pp | +21.0% | Yes |
| Aug 2024 | $22.0bn | 0.053% | -0.013 pp | +7.8% | Yes |
| Jul 2024 | $21.1bn | 0.038% | -0.011 pp | -4.2% | No |
| Jun 2024 | $19.0bn | 0.036% | -0.014 pp | -9.9% | No |
| May 2024 | $19.6bn | 0.037% | -0.015 pp | -6.5% | No |
| Apr 2024 | $19.7bn | 0.057% | -0.022 pp | -14.2% | Yes |
| Mar 2024 | $19.7bn | 0.055% | -0.023 pp | -11.5% | No |
| Feb 2024 | $19.0bn | 0.054% | -0.022 pp | -11.2% | No |
| Jan 2024 | $18.3bn | 0.054% | -0.022 pp | -17.4% | No |
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.