EFSI vs FIBK: Correlation
Measured on weekly returns over the past three years, Eagle Financial Services Inc (EFSI) and First Interstate BancSystem, Inc. (FIBK) carry a correlation of 0.40, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are EFSI and FIBK?
Over the past 3 years, EFSI and FIBK moved with a correlation of 0.40, which is moderate. The link has tightened recently: the 1-year correlation (0.64) runs above the 3-year figure (0.40). Over 5 years the correlation is 0.32, and the annualized covariance of weekly returns is 245.8 %².
FIBK is one of the assets that tracks EFSI most closely: it ranks #3 out of the 11 assets we track against EFSI. Neither side won the trailing year by much: +17.6% against +21.9%.
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.
EFSI vs FIBK: side by side
| EFSI (Eagle Financial Services Inc) | FIBK (First Interstate BancSystem, Inc.) | |
|---|---|---|
| 1-year return | +17.6% | +21.9% |
| 5-year return | +46.3% | +13.8% |
| Volatility (ann.) | 20.3% | 30.3% |
| Beta vs S&P 500 | 0.30 | 0.98 |
| Max drawdown (3Y) | -21.2% | -31.8% |
| Market cap | $0.2B | $3.6B |
| P/E (trailing) | 11.8 | 11.5 |
| Dividend yield | 2.97% | 5.05% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | EFSI | FIBK |
|---|---|---|
| 2022 | +8.0% | -0.8% |
| 2023 | -13.4% | -14.8% |
| 2024 | +26.2% | +12.9% |
| 2025 | +13.4% | +13.5% |
| 2026 | +7.1% | +11.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are EFSI and FIBK good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.40 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between EFSI and FIBK?
Using weekly returns as of 2026-08-27: 0.40 over 3 years, with 0.64 over the last year and 0.32 over 5 years.
Is FIBK a good diversifier for EFSI?
Yes, to a useful degree: a correlation of 0.40 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.40 mean?
On the −1 to +1 scale, 0.40 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/efsi-vs-fibk.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/efsi-vs-fibk/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: EFSI correlations · FIBK correlations
