BELFB vs ROCK: Correlation
Bel Fuse Inc. (BELFB) and Gibraltar Industries, Inc. (ROCK) show a moderate relationship: their 3-year correlation of weekly returns is 0.56.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BELFB and ROCK?
On 3 years of weekly data the BELFB/ROCK correlation comes out at 0.56, moderate. The relationship has been stable: the 1-year correlation (0.59) sits close to the 3-year figure. The 5-year figure is 0.46, and annualized covariance runs at 1075.0 %².
Among the 14 assets we track against BELFB, ROCK ranks #4 by 3-year correlation. Correlation aside, the last 12 months split them widely, with BELFB ahead by 112.7 points (+83.7% versus -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.
BELFB vs ROCK: side by side
| BELFB (Bel Fuse Inc.) | ROCK (Gibraltar Industries, Inc.) | |
|---|---|---|
| 1-year return | +83.7% | -29.0% |
| 5-year return | +1827.0% | -39.2% |
| Volatility (ann.) | 49.1% | 39.2% |
| Beta vs S&P 500 | 1.30 | 1.19 |
| Max drawdown (3Y) | -33.4% | -61.2% |
| Market cap | $3.7B | $1.4B |
| P/E (trailing) | 65.2 | 22.9 |
| Dividend yield | 0.09% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BELFB | ROCK |
|---|---|---|
| 2022 | +158.7% | -31.2% |
| 2023 | +104.2% | +72.1% |
| 2024 | +24.0% | -25.4% |
| 2025 | +106.3% | -16.1% |
| 2026 | +52.0% | -7.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BELFB and ROCK good diversifiers for each other?
Only partially. A correlation of 0.56 means BELFB and ROCK 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 BELFB and ROCK?
As of 2026-08-27, the correlation of weekly returns between BELFB and ROCK is 0.56 over 3 years, 0.59 over 1 year and 0.46 over 5 years.
Is ROCK a good diversifier for BELFB?
Only partially. A correlation of 0.56 means BELFB and ROCK share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.56 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/belfb-vs-rock.json
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Related comparisons
Hubs: BELFB correlations · ROCK correlations
