MSB vs ROCK: Correlation
Measured on weekly returns over the past three years, Mesabi Trust (MSB) and Gibraltar Industries, Inc. (ROCK) carry a correlation of 0.39, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MSB and ROCK?
On 3 years of weekly data the MSB/ROCK correlation comes out at 0.39, moderate. The past 12 months show a tighter link (0.50) than the 3-year average (0.39). The 5-year figure is 0.30, and annualized covariance runs at 605.5 %².
In MSB's tracked universe of 10 assets, ROCK sits right near the top at #2. The trailing year gives MSB the advantage: -23.2% versus -29.0%, a 5.8-point spread.
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.
MSB vs ROCK: side by side
| MSB (Mesabi Trust) | ROCK (Gibraltar Industries, Inc.) | |
|---|---|---|
| 1-year return | -23.2% | -29.0% |
| 5-year return | +19.2% | -39.2% |
| Volatility (ann.) | 39.9% | 39.2% |
| Beta vs S&P 500 | 0.92 | 1.19 |
| Max drawdown (3Y) | -45.8% | -61.2% |
| Market cap | – | $1.4B |
| P/E (trailing) | 27.4 | 22.9 |
| Dividend yield | 4.16% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | MSB | ROCK |
|---|---|---|
| 2022 | -22.8% | -31.2% |
| 2023 | +15.6% | +72.1% |
| 2024 | +47.0% | -25.4% |
| 2025 | +71.9% | -16.1% |
| 2026 | -37.6% | -7.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MSB and ROCK good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.39 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between MSB and ROCK?
Using weekly returns as of 2026-08-27: 0.39 over 3 years, with 0.50 over the last year and 0.30 over 5 years.
Is ROCK a good diversifier for MSB?
Yes, to a useful degree: a correlation of 0.39 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.39 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/msb-vs-rock.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/msb-vs-rock/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: MSB correlations · ROCK correlations
