IRWD vs ZKIN: Correlation
Ironwood Pharmaceuticals, Inc. (IRWD) and ZK International Group Co., Ltd (ZKIN) show a negative relationship: their 3-year correlation of weekly returns is -0.23.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IRWD and ZKIN?
On 3 years of weekly data the IRWD/ZKIN correlation comes out at -0.23, negative, meaning they tend to move in opposite directions. Lately the two have moved closer together, with the 1-year correlation at 0.10 versus -0.23 over 3 years. The 5-year figure is -0.22, and annualized covariance runs at -6054.9 %².
Among the 10 assets we track against IRWD, ZKIN sits near the bottom by co-movement, at rank #9. Correlation aside, the last 12 months split them widely, with IRWD ahead by 278.1 points (+236.5% versus -41.6%). Risk is not evenly split, since ZKIN carries 3.4 times the volatility of the other side.
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.
IRWD vs ZKIN: side by side
| IRWD (Ironwood Pharmaceuticals, Inc.) | ZKIN (ZK International Group Co., Ltd) | |
|---|---|---|
| 1-year return | +236.5% | -41.6% |
| 5-year return | -68.1% | -68.9% |
| Volatility (ann.) | 88.3% | 296.5% |
| Beta vs S&P 500 | 0.81 | -1.03 |
| Max drawdown (3Y) | -96.3% | -74.7% |
| Market cap | $0.7B | $0.1B |
| P/E (trailing) | 5.4 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | IRWD | ZKIN |
|---|---|---|
| 2022 | +6.3% | -70.6% |
| 2023 | -7.7% | +140.2% |
| 2024 | -61.3% | -38.8% |
| 2025 | -23.9% | +150.0% |
| 2026 | +25.8% | -23.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are IRWD and ZKIN good diversifiers for each other?
By historical standards, yes. A correlation of -0.23 means the two rarely move for the same reasons.
FAQ
What is the correlation between IRWD and ZKIN?
The IRWD/ZKIN correlation stands at -0.23 on a 3-year window (1 year: 0.10, 5 years: -0.22), computed from weekly returns as of 2026-08-27.
Is ZKIN a good diversifier for IRWD?
By historical standards, yes. A correlation of -0.23 means the two rarely move for the same reasons.
What does a correlation of -0.23 mean?
A reading of -0.23 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/irwd-vs-zkin.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/irwd-vs-zkin/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: IRWD correlations · ZKIN correlations
