ATRO vs NPO: Correlation
How closely do Astronics Corporation (ATRO) and Enpro Inc. (NPO) trade together? Their weekly returns over three years give a correlation of 0.49, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ATRO and NPO?
Over the past 3 years, ATRO and NPO moved with a correlation of 0.49, which is moderate. Little has changed lately, as the 1-year reading of 0.48 lands near the 3-year figure. Over 5 years the correlation is 0.42, and the annualized covariance of weekly returns is 799.2 %².
In ATRO's tracked universe of 11 assets, NPO sits right near the top at #2. Correlation aside, the last 12 months split them widely, with ATRO ahead by 130.4 points (+167.5% versus +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.
ATRO vs NPO: side by side
| ATRO (Astronics Corporation) | NPO (Enpro Inc.) | |
|---|---|---|
| 1-year return | +167.5% | +37.1% |
| 5-year return | +623.9% | +270.5% |
| Volatility (ann.) | 47.1% | 34.4% |
| Beta vs S&P 500 | 1.07 | 1.27 |
| Max drawdown (3Y) | -33.3% | -33.7% |
| Market cap | $3.4B | $6.5B |
| P/E (trailing) | 42.6 | 149.1 |
| Dividend yield | 0.00% | 0.41% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ATRO | NPO |
|---|---|---|
| 2022 | -14.2% | -0.2% |
| 2023 | +69.1% | +45.6% |
| 2024 | -8.4% | +10.9% |
| 2025 | +239.8% | +25.0% |
| 2026 | +80.2% | +44.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ATRO and NPO good diversifiers for each other?
A fair diversifier. At 0.49, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between ATRO and NPO?
The ATRO/NPO correlation stands at 0.49 on a 3-year window (1 year: 0.48, 5 years: 0.42), computed from weekly returns as of 2026-08-27.
Is NPO a good diversifier for ATRO?
A fair diversifier. At 0.49, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.49 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/atro-vs-npo.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/atro-vs-npo/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ATRO correlations · NPO correlations
