PKOH vs UNH: Correlation
How closely do Park-Ohio Holdings Corp. (PKOH) and UnitedHealth Group (UNH) trade together? Their weekly returns over three years give a correlation of 0.28, which is weak.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PKOH and UNH?
Over the past 3 years, PKOH and UNH moved with a correlation of 0.28, which is weak. Little has changed lately, as the 1-year reading of 0.20 lands near the 3-year figure. Over 5 years the correlation is 0.16, and the annualized covariance of weekly returns is 481.6 %².
UNH is close to the least connected end of PKOH's tracked universe, ranking #10 of 13. Their recent paths diverged sharply: over the last 12 months PKOH outperformed by 112.5 percentage points (+146.0% for PKOH against +33.5% for UNH).
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.
PKOH vs UNH: side by side
| PKOH (Park-Ohio Holdings Corp.) | UNH (UnitedHealth Group) | |
|---|---|---|
| 1-year return | +146.0% | +33.5% |
| 5-year return | +101.4% | +3.1% |
| Volatility (ann.) | 43.9% | 39.8% |
| Beta vs S&P 500 | 1.33 | 0.17 |
| Max drawdown (3Y) | -52.5% | -61.4% |
| Market cap | $0.7B | $354.6B |
| P/E (trailing) | 24.6 | 25.8 |
| Dividend yield | 1.09% | 2.23% |
| Sector / category | US Listed | Health Care |
Year-by-year returns
| Year | PKOH | UNH |
|---|---|---|
| 2022 | -40.3% | +6.9% |
| 2023 | +127.1% | +0.8% |
| 2024 | -0.8% | -2.4% |
| 2025 | -18.3% | -33.1% |
| 2026 | +129.2% | +21.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PKOH and UNH good diversifiers for each other?
A fair diversifier. At 0.28, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between PKOH and UNH?
Using weekly returns as of 2026-08-27: 0.28 over 3 years, with 0.20 over the last year and 0.16 over 5 years.
Is UNH a good diversifier for PKOH?
A fair diversifier. At 0.28, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.28 mean?
On the −1 to +1 scale, 0.28 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/pkoh-vs-unh.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/pkoh-vs-unh/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PKOH correlations · UNH correlations
