EXR vs ZCMD: Correlation
Extra Space Storage (EXR) and Zhongchao Inc. - Class A (ZCMD) show a negative relationship: their 3-year correlation of weekly returns is -0.18.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are EXR and ZCMD?
Over the past 3 years, EXR and ZCMD moved with a correlation of -0.18, which is negative, meaning they tend to move in opposite directions. The relationship has been stable: the 1-year correlation (-0.11) sits close to the 3-year figure. Over 5 years the correlation is -0.12, and the annualized covariance of weekly returns is -650.3 %².
Among the 33 assets we track against EXR, ZCMD sits near the bottom by co-movement, at rank #30. The last year tells two different stories: EXR led by 105.5 percentage points, +5.6% for EXR against -99.9% for ZCMD. Note the risk asymmetry: ZCMD runs 5.5 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
EXR vs ZCMD: side by side
| EXR (Extra Space Storage) | ZCMD (Zhongchao Inc. - Class A) | |
|---|---|---|
| 1-year return | +5.6% | -99.9% |
| 5-year return | -6.1% | -100.0% |
| Volatility (ann.) | 26.0% | 141.8% |
| Beta vs S&P 500 | 0.68 | 0.59 |
| Max drawdown (3Y) | -29.4% | -100.0% |
| Market cap | $31.5B | – |
| P/E (trailing) | 31.6 | – |
| Dividend yield | 4.50% | 0.00% |
| Sector / category | Real Estate | US Listed |
Year-by-year returns
| Year | EXR | ZCMD |
|---|---|---|
| 2022 | -32.8% | -35.4% |
| 2023 | +13.9% | -69.5% |
| 2024 | -2.8% | -53.8% |
| 2025 | -8.9% | -72.2% |
| 2026 | +12.1% | -99.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are EXR and ZCMD good diversifiers for each other?
Yes: at -0.18, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between EXR and ZCMD?
The EXR/ZCMD correlation stands at -0.18 on a 3-year window (1 year: -0.11, 5 years: -0.12), computed from weekly returns as of 2026-08-27.
Is ZCMD a good diversifier for EXR?
Yes: at -0.18, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.18 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/exr-vs-zcmd.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/exr-vs-zcmd/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: EXR correlations · ZCMD correlations
