BMRC vs THFF: Correlation
Bank of Marin Bancorp (BMRC) and First Financial Corporation (THFF) show a very strong relationship: their 3-year correlation of weekly returns is 0.83.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BMRC and THFF?
Over the past 3 years, BMRC and THFF moved with a correlation of 0.83, which is very strong, meaning they move nearly in lockstep. Little has changed lately, as the 1-year reading of 0.75 lands near the 3-year figure. Over 5 years the correlation is 0.76, and the annualized covariance of weekly returns is 766.8 %².
In BMRC's tracked universe of 11 assets, THFF sits right near the top at #1. The last year tells two different stories: THFF led by 26.1 percentage points, +12.7% for BMRC against +38.8% for THFF.
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.
BMRC vs THFF: side by side
| BMRC (Bank of Marin Bancorp) | THFF (First Financial Corporation) | |
|---|---|---|
| 1-year return | +12.7% | +38.8% |
| 5-year return | -8.2% | +135.2% |
| Volatility (ann.) | 33.0% | 28.2% |
| Beta vs S&P 500 | 0.75 | 0.81 |
| Max drawdown (3Y) | -35.2% | -20.2% |
| Market cap | $0.4B | $0.9B |
| P/E (trailing) | – | 11.1 |
| Dividend yield | 3.73% | 2.77% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BMRC | THFF |
|---|---|---|
| 2022 | -9.1% | +4.4% |
| 2023 | -29.5% | -2.6% |
| 2024 | +13.9% | +11.1% |
| 2025 | +14.2% | +36.2% |
| 2026 | +5.6% | +35.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BMRC and THFF good diversifiers for each other?
No. With a correlation of 0.83, BMRC and THFF move nearly in lockstep, so holding both adds very little diversification.
FAQ
What is the correlation between BMRC and THFF?
The BMRC/THFF correlation stands at 0.83 on a 3-year window (1 year: 0.75, 5 years: 0.76), computed from weekly returns as of 2026-08-27.
Is THFF a good diversifier for BMRC?
No. With a correlation of 0.83, BMRC and THFF move nearly in lockstep, so holding both adds very little diversification.
What does a correlation of 0.83 mean?
A reading of 0.83 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/bmrc-vs-thff.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/bmrc-vs-thff/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: BMRC correlations · THFF correlations
