BJ vs COST: Correlation
How closely do BJ's Wholesale Club Holdings, Inc. (BJ) 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 BJ and COST?
Across a 3-year window, the weekly returns of BJ and COST correlate at 0.35, moderate. Lately the two have moved closer together, with the 1-year correlation at 0.50 versus 0.35 over 3 years. Stretching to 5 years gives 0.50, with an annualized covariance of 184.7 %².
In BJ's tracked universe of 43 assets, COST sits right near the top at #3. The trailing year gives COST the advantage: -6.9% versus -1.0%, a 5.9-point spread.
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.
BJ vs COST: side by side
| BJ (BJ's Wholesale Club Holdings, Inc.) | COST (Costco) | |
|---|---|---|
| 1-year return | -6.9% | -1.0% |
| 5-year return | +59.5% | +116.3% |
| Volatility (ann.) | 26.4% | 19.8% |
| Beta vs S&P 500 | -0.14 | 0.45 |
| Max drawdown (3Y) | -30.1% | -20.7% |
| Market cap | $11.4B | $414.5B |
| P/E (trailing) | 20.4 | 48.1 |
| Dividend yield | 0.00% | 0.56% |
| Sector / category | US Listed | Consumer Staples |
Year-by-year returns
| Year | BJ | COST |
|---|---|---|
| 2022 | -1.2% | -19.0% |
| 2023 | +0.8% | +49.0% |
| 2024 | +34.0% | +39.6% |
| 2025 | +0.8% | -5.4% |
| 2026 | +0.5% | +8.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BJ and COST good diversifiers for each other?
A fair diversifier. At 0.35, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between BJ and COST?
As of 2026-08-27, the correlation of weekly returns between BJ and COST is 0.35 over 3 years, 0.50 over 1 year and 0.50 over 5 years.
Is COST a good diversifier for BJ?
A fair diversifier. At 0.35, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.35 mean?
On the −1 to +1 scale, 0.35 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/bj-vs-cost.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/bj-vs-cost/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: BJ correlations · COST correlations
