MAA vs ZCMD: Correlation
How closely do Mid-America Apartment Communities (MAA) and Zhongchao Inc. - Class A (ZCMD) trade together? Their weekly returns over three years give a correlation of -0.25, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MAA and ZCMD?
Over the past 3 years, MAA and ZCMD moved with a correlation of -0.25, which is negative, meaning they tend to move in opposite directions. The link has loosened recently: the 1-year correlation (-0.37) runs below the 3-year figure (-0.25). Over 5 years the correlation is -0.18, and the annualized covariance of weekly returns is -721.4 %².
Among the 31 assets we track against MAA, ZCMD sits near the bottom by co-movement, at rank #28. Correlation aside, the last 12 months split them widely, with MAA ahead by 93.3 points (-6.6% versus -99.9%). One caveat on sizing: ZCMD is 7.0 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
MAA vs ZCMD: side by side
| MAA (Mid-America Apartment Communities) | ZCMD (Zhongchao Inc. - Class A) | |
|---|---|---|
| 1-year return | -6.6% | -99.9% |
| 5-year return | -19.3% | -100.0% |
| Volatility (ann.) | 20.3% | 141.8% |
| Beta vs S&P 500 | 0.49 | 0.59 |
| Max drawdown (3Y) | -26.4% | -100.0% |
| Market cap | $15.3B | – |
| P/E (trailing) | 37.7 | – |
| Dividend yield | 4.63% | 0.00% |
| Sector / category | Real Estate | US Listed |
Year-by-year returns
| Year | MAA | ZCMD |
|---|---|---|
| 2022 | -29.7% | -35.4% |
| 2023 | -11.1% | -69.5% |
| 2024 | +19.9% | -53.8% |
| 2025 | -6.4% | -72.2% |
| 2026 | -4.0% | -99.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MAA and ZCMD good diversifiers for each other?
By historical standards, yes. A correlation of -0.25 means the two rarely move for the same reasons.
FAQ
What is the correlation between MAA and ZCMD?
Using weekly returns as of 2026-08-27: -0.25 over 3 years, with -0.37 over the last year and -0.18 over 5 years.
Is ZCMD a good diversifier for MAA?
By historical standards, yes. A correlation of -0.25 means the two rarely move for the same reasons.
What does a correlation of -0.25 mean?
On the −1 to +1 scale, -0.25 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/maa-vs-zcmd.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/maa-vs-zcmd/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: MAA correlations · ZCMD correlations
