BMRC vs STBA: Correlation
Bank of Marin Bancorp (BMRC) and S&T Bancorp, Inc. (STBA) show a very strong relationship: their 3-year correlation of weekly returns is 0.81.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BMRC and STBA?
Over the past 3 years, BMRC and STBA moved with a correlation of 0.81, which is very strong, meaning they move nearly in lockstep. Little has changed lately, as the 1-year reading of 0.76 lands near the 3-year figure. Over 5 years the correlation is 0.73, and the annualized covariance of weekly returns is 765.7 %².
Within BMRC's tracked universe of 11 assets, STBA comes in at #5 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months STBA outperformed by 16.3 percentage points (+12.7% for BMRC against +29.0% for STBA).
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 STBA: side by side
| BMRC (Bank of Marin Bancorp) | STBA (S&T Bancorp, Inc.) | |
|---|---|---|
| 1-year return | +12.7% | +29.0% |
| 5-year return | -8.2% | +102.2% |
| Volatility (ann.) | 33.0% | 28.7% |
| Beta vs S&P 500 | 0.75 | 0.68 |
| Max drawdown (3Y) | -35.2% | -26.1% |
| Market cap | $0.4B | $1.8B |
| P/E (trailing) | – | 13.3 |
| Dividend yield | 3.73% | 1.44% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BMRC | STBA |
|---|---|---|
| 2022 | -9.1% | +12.6% |
| 2023 | -29.5% | +2.1% |
| 2024 | +13.9% | +18.7% |
| 2025 | +14.2% | +6.7% |
| 2026 | +5.6% | +29.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BMRC and STBA good diversifiers for each other?
Not really. At 0.81, the two trade almost as one position, and owning both buys little extra protection.
FAQ
What is the correlation between BMRC and STBA?
As of 2026-08-27, the correlation of weekly returns between BMRC and STBA is 0.81 over 3 years, 0.76 over 1 year and 0.73 over 5 years.
Is STBA a good diversifier for BMRC?
Not really. At 0.81, the two trade almost as one position, and owning both buys little extra protection.
What does a correlation of 0.81 mean?
A reading of 0.81 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-stba.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/bmrc-vs-stba/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: BMRC correlations · STBA correlations
