AEE vs CMS: Correlation
Ameren (AEE) and CMS Energy (CMS) show a very strong relationship: their 3-year correlation of weekly returns is 0.81.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AEE and CMS?
On 3 years of weekly data the AEE/CMS correlation comes out at 0.81, very strong, meaning they move nearly in lockstep. Lately the two have moved closer together, with the 1-year correlation at 0.93 versus 0.81 over 3 years. The 5-year figure is 0.87, and annualized covariance runs at 232.7 %².
By 3-year correlation, CMS places #5 of the 35 assets tracked against AEE. On 12-month performance AEE holds a 11.2-point edge, +8.8% against -2.4%. On a rolling one-year basis the correlation drifted between 0.65 and 0.93, a moderate band.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
AEE vs CMS: side by side
| AEE (Ameren) | CMS (CMS Energy) | |
|---|---|---|
| 1-year return | +8.8% | -2.4% |
| 5-year return | +39.7% | +23.8% |
| Volatility (ann.) | 17.8% | 16.2% |
| Beta vs S&P 500 | 0.10 | -0.01 |
| Max drawdown (3Y) | -16.5% | -13.2% |
| Market cap | $29.6B | $21.4B |
| P/E (trailing) | 19.0 | 20.8 |
| Dividend yield | 2.71% | 3.21% |
| Sector / category | Utilities | Utilities |
Year-by-year returns
| Year | AEE | CMS |
|---|---|---|
| 2022 | +2.5% | +0.2% |
| 2023 | -16.1% | -5.2% |
| 2024 | +27.5% | +18.6% |
| 2025 | +15.3% | +8.1% |
| 2026 | +8.4% | +0.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AEE and CMS good diversifiers for each other?
No: a correlation of 0.81 means AEE and CMS tend to fall together, which is precisely when diversification is supposed to help.
FAQ
What is the correlation between AEE and CMS?
As of 2026-08-27, the correlation of weekly returns between AEE and CMS is 0.81 over 3 years, 0.93 over 1 year and 0.87 over 5 years.
Is CMS a good diversifier for AEE?
No: a correlation of 0.81 means AEE and CMS tend to fall together, which is precisely when diversification is supposed to help.
What does a correlation of 0.81 mean?
On the −1 to +1 scale, 0.81 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/aee-vs-cms.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/aee-vs-cms/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: AEE correlations · CMS correlations
