CMI vs ROK: Correlation
Measured on weekly returns over the past three years, Cummins (CMI) and Rockwell Automation (ROK) carry a correlation of 0.46, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CMI and ROK?
On 3 years of weekly data the CMI/ROK correlation comes out at 0.46, moderate. Little has changed lately, as the 1-year reading of 0.45 lands near the 3-year figure. The 5-year figure is 0.52, and annualized covariance runs at 335.9 %².
Within CMI's tracked universe of 36 assets, ROK comes in at #24 by 3-year correlation. The last year tells two different stories: CMI led by 19.4 percentage points, +45.1% for CMI against +25.7% for ROK. The rolling one-year correlation moved between 0.38 and 0.82 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.
CMI vs ROK: side by side
| CMI (Cummins) | ROK (Rockwell Automation) | |
|---|---|---|
| 1-year return | +45.1% | +25.7% |
| 5-year return | +169.6% | +44.9% |
| Volatility (ann.) | 25.9% | 27.9% |
| Beta vs S&P 500 | 1.05 | 0.97 |
| Max drawdown (3Y) | -30.5% | -29.0% |
| Market cap | $79.0B | $48.2B |
| P/E (trailing) | 29.6 | 40.6 |
| Dividend yield | 1.38% | 1.26% |
| Sector / category | Industrials | Industrials |
Year-by-year returns
| Year | CMI | ROK |
|---|---|---|
| 2022 | +14.1% | -24.8% |
| 2023 | +1.7% | +22.6% |
| 2024 | +48.9% | -6.2% |
| 2025 | +49.4% | +38.4% |
| 2026 | +13.6% | +12.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CMI and ROK good diversifiers for each other?
Reasonably. At 0.46, CMI and ROK keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between CMI and ROK?
The CMI/ROK correlation stands at 0.46 on a 3-year window (1 year: 0.45, 5 years: 0.52), computed from weekly returns as of 2026-08-27.
Is ROK a good diversifier for CMI?
Reasonably. At 0.46, CMI and ROK keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.46 mean?
A reading of 0.46 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/cmi-vs-rok.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/cmi-vs-rok/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: CMI correlations · ROK correlations
