MLM vs ZCMD: Correlation
Martin Marietta Materials (MLM) and Zhongchao Inc. - Class A (ZCMD) show a negative relationship: their 3-year correlation of weekly returns is -0.21.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MLM and ZCMD?
Over the past 3 years, MLM and ZCMD moved with a correlation of -0.21, which is negative, meaning they tend to move in opposite directions. Little has changed lately, as the 1-year reading of -0.18 lands near the 3-year figure. Over 5 years the correlation is -0.14, and the annualized covariance of weekly returns is -727.4 %².
Among the 36 assets we track against MLM, ZCMD ranks #30 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months MLM outperformed by 86.1 percentage points (-13.8% for MLM against -99.9% for ZCMD). One caveat on sizing: ZCMD is 5.9 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.
MLM vs ZCMD: side by side
| MLM (Martin Marietta Materials) | ZCMD (Zhongchao Inc. - Class A) | |
|---|---|---|
| 1-year return | -13.8% | -99.9% |
| 5-year return | +42.4% | -100.0% |
| Volatility (ann.) | 23.9% | 141.8% |
| Beta vs S&P 500 | 0.85 | 0.59 |
| Max drawdown (3Y) | -26.8% | -100.0% |
| Market cap | $37.5B | – |
| P/E (trailing) | 34.4 | – |
| Dividend yield | 0.62% | 0.00% |
| Sector / category | Materials | US Listed |
Year-by-year returns
| Year | MLM | ZCMD |
|---|---|---|
| 2022 | -22.7% | -35.4% |
| 2023 | +48.6% | -69.5% |
| 2024 | +4.1% | -53.8% |
| 2025 | +21.3% | -72.2% |
| 2026 | -14.9% | -99.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MLM and ZCMD good diversifiers for each other?
By historical standards, yes. A correlation of -0.21 means the two rarely move for the same reasons.
FAQ
What is the correlation between MLM and ZCMD?
Using weekly returns as of 2026-08-27: -0.21 over 3 years, with -0.18 over the last year and -0.14 over 5 years.
Is ZCMD a good diversifier for MLM?
By historical standards, yes. A correlation of -0.21 means the two rarely move for the same reasons.
What does a correlation of -0.21 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/mlm-vs-zcmd.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/mlm-vs-zcmd/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: MLM correlations · ZCMD correlations
