PKG vs ZCMD: Correlation
Measured on weekly returns over the past three years, Packaging Corporation of America (PKG) and Zhongchao Inc. - Class A (ZCMD) carry a correlation of -0.17, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PKG and ZCMD?
Over the past 3 years, PKG and ZCMD moved with a correlation of -0.17, which is negative, meaning they tend to move in opposite directions. Recent behaviour matches the longer record: -0.27 over 1 year against -0.17 over 3. Over 5 years the correlation is -0.13, and the annualized covariance of weekly returns is -566.0 %².
Among the 32 assets we track against PKG, ZCMD ranks #24 by 3-year correlation. The last year tells two different stories: PKG led by 118.4 percentage points, +18.5% for PKG against -99.9% for ZCMD. One caveat on sizing: ZCMD is 6.0 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.
PKG vs ZCMD: side by side
| PKG (Packaging Corporation of America) | ZCMD (Zhongchao Inc. - Class A) | |
|---|---|---|
| 1-year return | +18.5% | -99.9% |
| 5-year return | +86.8% | -100.0% |
| Volatility (ann.) | 23.5% | 141.8% |
| Beta vs S&P 500 | 0.52 | 0.59 |
| Max drawdown (3Y) | -28.4% | -100.0% |
| Market cap | $21.7B | – |
| P/E (trailing) | 31.6 | – |
| Dividend yield | 2.13% | 0.00% |
| Sector / category | Materials | US Listed |
Year-by-year returns
| Year | PKG | ZCMD |
|---|---|---|
| 2022 | -2.6% | -35.4% |
| 2023 | +31.9% | -69.5% |
| 2024 | +41.7% | -53.8% |
| 2025 | -6.1% | -72.2% |
| 2026 | +19.6% | -99.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PKG and ZCMD good diversifiers for each other?
Yes: at -0.17, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between PKG and ZCMD?
As of 2026-08-27, the correlation of weekly returns between PKG and ZCMD is -0.17 over 3 years, -0.27 over 1 year and -0.13 over 5 years.
Is ZCMD a good diversifier for PKG?
Yes: at -0.17, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.17 mean?
On the −1 to +1 scale, -0.17 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/pkg-vs-zcmd.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/pkg-vs-zcmd/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PKG correlations · ZCMD correlations
