CMS vs DUK: Correlation
CMS Energy (CMS) and Duke Energy (DUK) show a strong relationship: their 3-year correlation of weekly returns is 0.78.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CMS and DUK?
Over the past 3 years, CMS and DUK moved with a correlation of 0.78, which is strong. The relationship has been stable: the 1-year correlation (0.87) sits close to the 3-year figure. Over 5 years the correlation is 0.85, and the annualized covariance of weekly returns is 202.0 %².
Among the 42 assets we track against CMS, DUK ranks #10 by 3-year correlation. Their 12-month results are close: -2.4% for CMS against +1.1% for DUK. The rolling one-year correlation moved between 0.61 and 0.92 over the past three years, a moderate range.
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.
CMS vs DUK: side by side
| CMS (CMS Energy) | DUK (Duke Energy) | |
|---|---|---|
| 1-year return | -2.4% | +1.1% |
| 5-year return | +23.8% | +39.8% |
| Volatility (ann.) | 16.2% | 15.9% |
| Beta vs S&P 500 | -0.01 | -0.09 |
| Max drawdown (3Y) | -13.2% | -11.6% |
| Market cap | $21.4B | $94.2B |
| P/E (trailing) | 20.8 | 18.3 |
| Dividend yield | 3.21% | 3.49% |
| Sector / category | Utilities | Utilities |
Year-by-year returns
| Year | CMS | DUK |
|---|---|---|
| 2022 | +0.2% | +2.0% |
| 2023 | -5.2% | -1.6% |
| 2024 | +18.6% | +15.6% |
| 2025 | +8.1% | +12.7% |
| 2026 | +0.0% | +5.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CMS and DUK good diversifiers for each other?
To a limited degree. At 0.78 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between CMS and DUK?
The CMS/DUK correlation stands at 0.78 on a 3-year window (1 year: 0.87, 5 years: 0.85), computed from weekly returns as of 2026-08-27.
Is DUK a good diversifier for CMS?
To a limited degree. At 0.78 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.78 mean?
A reading of 0.78 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/cms-vs-duk.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/cms-vs-duk/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: CMS correlations · DUK correlations
