Observatory · observe first
Alliant Energy
LNT · United States · Electric Utilities · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.032%
12M weight contribution
-0.003 pp
3M weight contribution
+0.006 pp
12M price return
+12.3%
Share of matched S&P 500 members
Monthly observations through Jul 2026
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 |
|---|---|---|---|---|---|
| Jul 2026 | $18.3bn | 0.032% | -0.003 pp | +12.3% | Yes |
| Jun 2026 | $19.7bn | 0.034% | +0.001 pp | +30.1% | Yes |
| May 2026 | $18.5bn | 0.032% | -0.004 pp | +18.7% | Yes |
| Apr 2026 | $18.9bn | 0.026% | -0.012 pp | +24.1% | No |
| Mar 2026 | $18.5bn | 0.027% | -0.012 pp | +15.1% | No |
| Feb 2026 | $18.6bn | 0.026% | -0.012 pp | +15.7% | No |
| Jan 2026 | $16.9bn | 0.032% | -0.001 pp | +15.5% | No |
| Dec 2025 | $16.7bn | 0.033% | -0.002 pp | +13.5% | No |
| Nov 2025 | $17.9bn | 0.035% | -0.001 pp | +13.5% | Yes |
| Oct 2025 | $17.2bn | 0.034% | -0.003 pp | +15.0% | No |
| Sep 2025 | $17.3bn | 0.035% | -0.002 pp | +14.8% | No |
| Aug 2025 | $16.7bn | 0.035% | -0.001 pp | +15.4% | No |
| Jul 2025 | $16.7bn | 0.035% | +0.010 pp | +20.7% | No |
| Jun 2025 | $15.5bn | 0.033% | +0.009 pp | +22.9% | No |
| May 2025 | $16.0bn | 0.036% | +0.011 pp | +25.0% | No |
| Apr 2025 | $15.7bn | 0.038% | +0.001 pp | +26.8% | Yes |
| Mar 2025 | $16.5bn | 0.039% | +0.003 pp | +32.2% | Yes |
| Feb 2025 | $16.6bn | 0.037% | +0.002 pp | +40.0% | Yes |
| Jan 2025 | $15.1bn | 0.034% | -0.003 pp | +25.3% | No |
| Dec 2024 | $15.2bn | 0.034% | -0.005 pp | +19.5% | Yes |
| Nov 2024 | $16.2bn | 0.036% | -0.004 pp | +29.6% | Yes |
| Oct 2024 | $15.4bn | 0.036% | -0.006 pp | +27.5% | Yes |
| Sep 2024 | $15.6bn | 0.036% | -0.005 pp | +30.0% | Yes |
| Aug 2024 | $14.9bn | 0.036% | -0.004 pp | +20.6% | 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.