PCAR vs RPM: Correlation
Paccar (PCAR) and RPM International Inc. (RPM) show a moderate relationship: their 3-year correlation of weekly returns is 0.57.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PCAR and RPM?
On 3 years of weekly data the PCAR/RPM correlation comes out at 0.57, moderate. The relationship has been stable: the 1-year correlation (0.47) sits close to the 3-year figure. The 5-year figure is 0.52, and annualized covariance runs at 341.4 %².
Within PCAR's tracked universe of 27 assets, RPM comes in at #7 by 3-year correlation. Correlation aside, the last 12 months split them widely, with PCAR ahead by 42.1 points (+27.8% versus -14.3%).
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.
PCAR vs RPM: side by side
| PCAR (Paccar) | RPM (RPM International Inc.) | |
|---|---|---|
| 1-year return | +27.8% | -14.3% |
| 5-year return | +177.9% | +38.7% |
| Volatility (ann.) | 24.1% | 25.0% |
| Beta vs S&P 500 | 0.74 | 0.85 |
| Max drawdown (3Y) | -27.7% | -32.0% |
| Market cap | $66.6B | $13.5B |
| P/E (trailing) | 26.6 | 20.7 |
| Dividend yield | 1.04% | 1.99% |
| Sector / category | Industrials | US Listed |
Year-by-year returns
| Year | PCAR | RPM |
|---|---|---|
| 2022 | +17.0% | -1.7% |
| 2023 | +55.0% | +16.8% |
| 2024 | +10.8% | +12.1% |
| 2025 | +8.0% | -13.9% |
| 2026 | +16.5% | +3.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PCAR and RPM good diversifiers for each other?
Only partially. A correlation of 0.57 means PCAR and RPM share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between PCAR and RPM?
Using weekly returns as of 2026-08-27: 0.57 over 3 years, with 0.47 over the last year and 0.52 over 5 years.
Is RPM a good diversifier for PCAR?
Only partially. A correlation of 0.57 means PCAR and RPM share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.57 mean?
On the −1 to +1 scale, 0.57 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/pcar-vs-rpm.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/pcar-vs-rpm/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: PCAR correlations · RPM correlations
