Observatory · observe first
Southern Company
SO · United States · Electric Utilities · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.165%
12M weight contribution
-0.045 pp
3M weight contribution
-0.015 pp
12M price return
-1.5%
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 | $99.2bn | 0.165% | -0.045 pp | -1.5% | No |
| Jul 2026 | $106.6bn | 0.186% | -0.033 pp | +3.3% | Yes |
| Jun 2026 | $107.9bn | 0.187% | -0.030 pp | +7.6% | Yes |
| May 2026 | $103.8bn | 0.180% | -0.044 pp | +5.6% | Yes |
| Apr 2026 | $109.0bn | 0.148% | -0.094 pp | +8.7% | No |
| Mar 2026 | $108.0bn | 0.157% | -0.082 pp | +8.4% | No |
| Feb 2026 | $109.0bn | 0.150% | -0.071 pp | +12.0% | No |
| Jan 2026 | $98.3bn | 0.188% | -0.016 pp | +9.9% | No |
| Dec 2025 | $96.0bn | 0.188% | -0.016 pp | +9.5% | No |
| Nov 2025 | $100.3bn | 0.197% | -0.018 pp | +5.7% | No |
| Oct 2025 | $103.5bn | 0.203% | -0.032 pp | +6.8% | No |
| Sep 2025 | $104.3bn | 0.209% | -0.021 pp | +8.6% | No |
| Aug 2025 | $101.5bn | 0.210% | -0.018 pp | +10.4% | No |
| Jul 2025 | $103.9bn | 0.219% | +0.055 pp | +17.0% | No |
| Jun 2025 | $100.9bn | 0.218% | +0.059 pp | +22.4% | No |
| May 2025 | $98.9bn | 0.224% | +0.057 pp | +16.1% | Yes |
| Apr 2025 | $100.8bn | 0.242% | +0.010 pp | +29.4% | Yes |
| Mar 2025 | $100.9bn | 0.239% | +0.022 pp | +32.6% | Yes |
| Feb 2025 | $98.5bn | 0.220% | +0.010 pp | +38.1% | Yes |
| Jan 2025 | $92.0bn | 0.205% | -0.021 pp | +25.2% | No |
| Dec 2024 | $90.2bn | 0.205% | -0.024 pp | +21.7% | No |
| Nov 2024 | $97.7bn | 0.215% | -0.026 pp | +30.2% | Yes |
| Oct 2024 | $99.7bn | 0.234% | -0.015 pp | +40.5% | Yes |
| Sep 2024 | $98.7bn | 0.230% | -0.006 pp | +44.7% | 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.