APT vs PRIM: Correlation
How closely do Alpha Pro Tech, Ltd. (APT) and Primoris Services Corporation (PRIM) trade together? Their weekly returns over three years give a correlation of -0.23, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are APT and PRIM?
Across a 3-year window, the weekly returns of APT and PRIM correlate at -0.23, negative, meaning they tend to move in opposite directions. The link has loosened recently: the 1-year correlation (-0.58) runs below the 3-year figure (-0.23). Stretching to 5 years gives -0.16, with an annualized covariance of -485.7 %².
Among the 12 assets we track against APT, PRIM sits near the bottom by co-movement, at rank #10. Their recent paths diverged sharply: over the last 12 months APT outperformed by 47.0 percentage points (+12.8% for APT against -34.2% for PRIM).
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.
APT vs PRIM: side by side
| APT (Alpha Pro Tech, Ltd.) | PRIM (Primoris Services Corporation) | |
|---|---|---|
| 1-year return | +12.8% | -34.2% |
| 5-year return | -33.5% | +212.4% |
| Volatility (ann.) | 42.0% | 50.6% |
| Beta vs S&P 500 | 0.65 | 1.49 |
| Max drawdown (3Y) | -39.0% | -63.1% |
| Market cap | $0.1B | $4.2B |
| P/E (trailing) | 14.0 | 30.7 |
| Dividend yield | 0.00% | 0.41% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | APT | PRIM |
|---|---|---|
| 2022 | -32.7% | -7.5% |
| 2023 | +31.6% | +52.6% |
| 2024 | +0.0% | +131.1% |
| 2025 | -16.1% | +63.1% |
| 2026 | +23.2% | -37.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are APT and PRIM good diversifiers for each other?
Yes. With a correlation of -0.23, APT and PRIM have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between APT and PRIM?
Using weekly returns as of 2026-08-27: -0.23 over 3 years, with -0.58 over the last year and -0.16 over 5 years.
Is PRIM a good diversifier for APT?
Yes. With a correlation of -0.23, APT and PRIM have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.23 mean?
A reading of -0.23 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/apt-vs-prim.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/apt-vs-prim/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: APT correlations · PRIM correlations
