CASY vs COST: Correlation
How closely do Casey's (CASY) and Costco (COST) trade together? Their weekly returns over three years give a correlation of 0.35, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CASY and COST?
Over the past 3 years, CASY and COST moved with a correlation of 0.35, which is moderate. The past 12 months show a tighter link (0.49) than the 3-year average (0.35). Over 5 years the correlation is 0.41, and the annualized covariance of weekly returns is 200.1 %².
Within CASY's tracked universe of 30 assets, COST comes in at #4 by 3-year correlation. The last year tells two different stories: CASY led by 54.7 percentage points, +53.7% for CASY against -1.0% for COST. On a rolling one-year basis the correlation drifted between 0.06 and 0.51, a moderate band.
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.
CASY vs COST: side by side
| CASY (Casey's) | COST (Costco) | |
|---|---|---|
| 1-year return | +53.7% | -1.0% |
| 5-year return | +284.3% | +116.3% |
| Volatility (ann.) | 28.9% | 19.8% |
| Beta vs S&P 500 | 0.39 | 0.45 |
| Max drawdown (3Y) | -16.6% | -20.7% |
| Market cap | $28.2B | $414.5B |
| P/E (trailing) | 42.2 | 48.1 |
| Dividend yield | 0.28% | 0.56% |
| Sector / category | Consumer Staples | Consumer Staples |
Year-by-year returns
| Year | CASY | COST |
|---|---|---|
| 2022 | +14.5% | -19.0% |
| 2023 | +23.3% | +49.0% |
| 2024 | +45.0% | +39.6% |
| 2025 | +40.1% | -5.4% |
| 2026 | +38.4% | +8.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CASY and COST good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.35 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between CASY and COST?
Using weekly returns as of 2026-08-27: 0.35 over 3 years, with 0.49 over the last year and 0.41 over 5 years.
Is COST a good diversifier for CASY?
Yes, to a useful degree: a correlation of 0.35 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.35 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/casy-vs-cost.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/casy-vs-cost/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: CASY correlations · COST correlations
