BY vs ISTR: Correlation
How closely do Byline Bancorp, Inc. (BY) and Investar Holding Corporation (ISTR) trade together? Their weekly returns over three years give a correlation of 0.75, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BY and ISTR?
Across a 3-year window, the weekly returns of BY and ISTR correlate at 0.75, strong. Recent behaviour matches the longer record: 0.79 over 1 year against 0.75 over 3. Stretching to 5 years gives 0.63, with an annualized covariance of 643.2 %².
Among the 70 assets we track against BY, ISTR ranks #44 by 3-year correlation. Their 12-month results are close: +32.5% for BY against +32.3% for ISTR.
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.
BY vs ISTR: side by side
| BY (Byline Bancorp, Inc.) | ISTR (Investar Holding Corporation) | |
|---|---|---|
| 1-year return | +32.5% | +32.3% |
| 5-year return | +66.2% | +50.1% |
| Volatility (ann.) | 26.8% | 32.1% |
| Beta vs S&P 500 | 0.80 | 0.84 |
| Max drawdown (3Y) | -27.2% | -35.3% |
| Market cap | $1.7B | $0.4B |
| P/E (trailing) | 11.5 | 12.4 |
| Dividend yield | 1.15% | 1.50% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BY | ISTR |
|---|---|---|
| 2022 | -14.7% | +19.0% |
| 2023 | +4.3% | -28.6% |
| 2024 | +25.0% | +50.7% |
| 2025 | +2.0% | +24.2% |
| 2026 | +32.7% | +14.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BY and ISTR good diversifiers for each other?
To a limited degree. At 0.75 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 BY and ISTR?
As of 2026-08-27, the correlation of weekly returns between BY and ISTR is 0.75 over 3 years, 0.79 over 1 year and 0.63 over 5 years.
Is ISTR a good diversifier for BY?
To a limited degree. At 0.75 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 0.75 mean?
On the −1 to +1 scale, 0.75 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/by-vs-istr.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/by-vs-istr/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: BY correlations · ISTR correlations
