ECBK vs ISTR: Correlation
ECB Bancorp, Inc. (ECBK) and Investar Holding Corporation (ISTR) show a moderate relationship: their 3-year correlation of weekly returns is 0.49.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ECBK and ISTR?
On 3 years of weekly data the ECBK/ISTR correlation comes out at 0.49, moderate. The relationship has been stable: the 1-year correlation (0.51) sits close to the 3-year figure. The 5-year figure is 0.46, and annualized covariance runs at 371.8 %².
ISTR is one of the assets that tracks ECBK most closely: it ranks #2 out of the 11 assets we track against ECBK. On 12-month performance ISTR holds a 11.4-point edge, +20.9% against +32.3%.
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.
ECBK vs ISTR: side by side
| ECBK (ECB Bancorp, Inc.) | ISTR (Investar Holding Corporation) | |
|---|---|---|
| 1-year return | +20.9% | +32.3% |
| 5-year return | n/a | +50.1% |
| Volatility (ann.) | 23.4% | 32.1% |
| Beta vs S&P 500 | 0.45 | 0.84 |
| Max drawdown (3Y) | -19.7% | -35.3% |
| Market cap | $0.2B | $0.4B |
| P/E (trailing) | 14.8 | 12.4 |
| Dividend yield | 0.00% | 1.50% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ECBK | ISTR |
|---|---|---|
| 2022 | – | +19.0% |
| 2023 | -21.7% | -28.6% |
| 2024 | +18.2% | +50.7% |
| 2025 | +17.2% | +24.2% |
| 2026 | +19.2% | +14.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ECBK and ISTR good diversifiers for each other?
A fair diversifier. At 0.49, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between ECBK and ISTR?
Using weekly returns as of 2026-08-27: 0.49 over 3 years, with 0.51 over the last year and 0.46 over 5 years.
Is ISTR a good diversifier for ECBK?
A fair diversifier. At 0.49, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.49 mean?
On the −1 to +1 scale, 0.49 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/ecbk-vs-istr.json
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Related comparisons
Hubs: ECBK correlations · ISTR correlations
