ACA vs NPO: Correlation
Arcosa, Inc. (ACA) and Enpro Inc. (NPO) show a strong relationship: their 3-year correlation of weekly returns is 0.63.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACA and NPO?
Across a 3-year window, the weekly returns of ACA and NPO correlate at 0.63, strong. The link has loosened recently: the 1-year correlation (0.45) runs below the 3-year figure (0.63). Stretching to 5 years gives 0.55, with an annualized covariance of 688.5 %².
By 3-year correlation, NPO places #5 of the 23 assets tracked against ACA. Over the last 12 months ACA came out ahead by 9.9 percentage points (+47.0% against +37.1%).
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.
ACA vs NPO: side by side
| ACA (Arcosa, Inc.) | NPO (Enpro Inc.) | |
|---|---|---|
| 1-year return | +47.0% | +37.1% |
| 5-year return | +186.5% | +270.5% |
| Volatility (ann.) | 31.9% | 34.4% |
| Beta vs S&P 500 | 1.23 | 1.27 |
| Max drawdown (3Y) | -36.6% | -33.7% |
| Market cap | $7.1B | $6.5B |
| P/E (trailing) | 32.5 | 149.1 |
| Dividend yield | 0.14% | 0.41% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ACA | NPO |
|---|---|---|
| 2022 | +3.5% | -0.2% |
| 2023 | +52.5% | +45.6% |
| 2024 | +17.3% | +10.9% |
| 2025 | +10.2% | +25.0% |
| 2026 | +37.0% | +44.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACA and NPO good diversifiers for each other?
To a limited degree. At 0.63 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 ACA and NPO?
Using weekly returns as of 2026-08-27: 0.63 over 3 years, with 0.45 over the last year and 0.55 over 5 years.
Is NPO a good diversifier for ACA?
To a limited degree. At 0.63 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 0.63 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/aca-vs-npo.json
Embed this badge (it refreshes with the data), with attribution:
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Related comparisons
Hubs: ACA correlations · NPO correlations
