ALG vs ROCK: Correlation
Measured on weekly returns over the past three years, Alamo Group, Inc. (ALG) and Gibraltar Industries, Inc. (ROCK) carry a correlation of 0.63, a strong link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ALG and ROCK?
Over the past 3 years, ALG and ROCK moved with a correlation of 0.63, which is strong. Little has changed lately, as the 1-year reading of 0.59 lands near the 3-year figure. Over 5 years the correlation is 0.56, and the annualized covariance of weekly returns is 753.2 %².
Among the 17 assets we track against ALG, ROCK ranks #4 by 3-year correlation. Over the last 12 months ALG came out ahead by 5.0 percentage points (-24.0% against -29.0%).
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.
ALG vs ROCK: side by side
| ALG (Alamo Group, Inc.) | ROCK (Gibraltar Industries, Inc.) | |
|---|---|---|
| 1-year return | -24.0% | -29.0% |
| 5-year return | +9.2% | -39.2% |
| Volatility (ann.) | 30.3% | 39.2% |
| Beta vs S&P 500 | 0.83 | 1.19 |
| Max drawdown (3Y) | -36.3% | -61.2% |
| Market cap | $2.0B | $1.4B |
| P/E (trailing) | 19.8 | 22.9 |
| Dividend yield | 0.78% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ALG | ROCK |
|---|---|---|
| 2022 | -3.3% | -31.2% |
| 2023 | +49.2% | +72.1% |
| 2024 | -11.1% | -25.4% |
| 2025 | -9.1% | -16.1% |
| 2026 | -1.7% | -7.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ALG and ROCK 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 ALG and ROCK?
The ALG/ROCK correlation stands at 0.63 on a 3-year window (1 year: 0.59, 5 years: 0.56), computed from weekly returns as of 2026-08-27.
Is ROCK a good diversifier for ALG?
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/alg-vs-rock.json
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Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: ALG correlations · ROCK correlations
