Observatory · observe first
American Electric Power
AEP · United States · Electric Utilities · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.111%
12M weight contribution
-0.012 pp
3M weight contribution
-0.008 pp
12M price return
+13.7%
Share of matched S&P 500 members
Monthly observations through Aug 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 |
|---|---|---|---|---|---|
| Aug 2026 | $66.6bn | 0.111% | -0.012 pp | +13.7% | No |
| Jul 2026 | $69.6bn | 0.121% | -0.006 pp | +16.6% | Yes |
| Jun 2026 | $74.4bn | 0.129% | +0.010 pp | +36.0% | Yes |
| May 2026 | $68.9bn | 0.119% | -0.006 pp | +26.3% | Yes |
| Apr 2026 | $74.2bn | 0.101% | -0.038 pp | +30.8% | No |
| Mar 2026 | $70.9bn | 0.103% | -0.035 pp | +24.0% | No |
| Feb 2026 | $72.4bn | 0.099% | -0.027 pp | +30.4% | No |
| Jan 2026 | $64.1bn | 0.123% | +0.006 pp | +26.0% | No |
| Dec 2025 | $61.7bn | 0.121% | +0.010 pp | +29.4% | No |
| Nov 2025 | $66.2bn | 0.130% | +0.013 pp | +28.3% | Yes |
| Oct 2025 | $64.4bn | 0.126% | +0.003 pp | +26.3% | Yes |
| Sep 2025 | $60.2bn | 0.120% | -0.007 pp | +13.7% | No |
| Aug 2025 | $59.4bn | 0.123% | -0.006 pp | +14.8% | No |
| Jul 2025 | $60.5bn | 0.128% | +0.034 pp | +19.6% | No |
| Jun 2025 | $55.4bn | 0.120% | +0.033 pp | +22.7% | No |
| May 2025 | $55.3bn | 0.125% | +0.034 pp | +19.0% | No |
| Apr 2025 | $57.7bn | 0.139% | +0.007 pp | +30.8% | Yes |
| Mar 2025 | $58.2bn | 0.138% | +0.013 pp | +31.8% | Yes |
| Feb 2025 | $56.5bn | 0.126% | -0.002 pp | +29.3% | Yes |
| Jan 2025 | $52.4bn | 0.116% | -0.006 pp | +31.0% | No |
| Dec 2024 | $49.1bn | 0.111% | -0.016 pp | +18.2% | No |
| Nov 2024 | $53.2bn | 0.117% | -0.013 pp | +30.6% | Yes |
| Oct 2024 | $52.5bn | 0.123% | -0.009 pp | +36.3% | Yes |
| Sep 2024 | $54.6bn | 0.127% | -0.002 pp | +42.2% | 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.