CFFN vs COFS: Correlation
How closely do Capitol Federal Financial, Inc. (CFFN) and ChoiceOne Financial Services, Inc. (COFS) trade together? Their weekly returns over three years give a correlation of 0.68, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CFFN and COFS?
Over the past 3 years, CFFN and COFS moved with a correlation of 0.68, which is strong. Recent behaviour matches the longer record: 0.65 over 1 year against 0.68 over 3. Over 5 years the correlation is 0.59, and the annualized covariance of weekly returns is 754.1 %².
Within CFFN's tracked universe of 14 assets, COFS comes in at #6 by 3-year correlation. Correlation aside, the last 12 months split them widely, with CFFN ahead by 30.3 points (+41.0% versus +10.7%).
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.
CFFN vs COFS: side by side
| CFFN (Capitol Federal Financial, Inc.) | COFS (ChoiceOne Financial Services, Inc.) | |
|---|---|---|
| 1-year return | +41.0% | +10.7% |
| 5-year return | +4.8% | +66.4% |
| Volatility (ann.) | 30.6% | 36.3% |
| Beta vs S&P 500 | 0.78 | 0.84 |
| Max drawdown (3Y) | -29.0% | -34.9% |
| Market cap | $1.1B | $0.5B |
| P/E (trailing) | 13.3 | 8.8 |
| Dividend yield | 3.93% | 3.43% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | CFFN | COFS |
|---|---|---|
| 2022 | -16.3% | +14.4% |
| 2023 | -21.2% | +5.3% |
| 2024 | -2.9% | +26.3% |
| 2025 | +22.0% | -14.0% |
| 2026 | +31.8% | +14.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CFFN and COFS good diversifiers for each other?
To a limited degree. At 0.68 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 CFFN and COFS?
As of 2026-08-27, the correlation of weekly returns between CFFN and COFS is 0.68 over 3 years, 0.65 over 1 year and 0.59 over 5 years.
Is COFS a good diversifier for CFFN?
To a limited degree. At 0.68 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 0.68 mean?
On the −1 to +1 scale, 0.68 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/cffn-vs-cofs.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/cffn-vs-cofs/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: CFFN correlations · COFS correlations
