PLRX vs WST: Correlation
Measured on weekly returns over the past three years, Pliant Therapeutics, Inc. (PLRX) and West Pharmaceutical Services (WST) carry a correlation of 0.41, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PLRX and WST?
Over the past 3 years, PLRX and WST moved with a correlation of 0.41, which is moderate. Lately the two have drifted apart, with the 1-year correlation at 0.17 versus 0.41 over 3 years. Over 5 years the correlation is 0.18, and the annualized covariance of weekly returns is 1193.5 %².
Among the 17 assets we track against PLRX, WST ranks #6 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months WST outperformed by 73.1 percentage points (-32.0% for PLRX against +41.1% for WST). Risk is not evenly split, since PLRX carries 1.9 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.
PLRX vs WST: side by side
| PLRX (Pliant Therapeutics, Inc.) | WST (West Pharmaceutical Services) | |
|---|---|---|
| 1-year return | -32.0% | +41.1% |
| 5-year return | -93.6% | -22.4% |
| Volatility (ann.) | 74.8% | 38.6% |
| Beta vs S&P 500 | 1.32 | 0.86 |
| Max drawdown (3Y) | -94.7% | -53.8% |
| Market cap | $0.1B | $24.4B |
| P/E (trailing) | – | 44.8 |
| Dividend yield | 0.00% | 0.25% |
| Sector / category | US Listed | Health Care |
Year-by-year returns
| Year | PLRX | WST |
|---|---|---|
| 2022 | +43.2% | -49.7% |
| 2023 | -6.3% | +50.0% |
| 2024 | -27.3% | -6.8% |
| 2025 | -90.7% | -15.7% |
| 2026 | -5.7% | +26.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PLRX and WST good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.41 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between PLRX and WST?
Using weekly returns as of 2026-08-27: 0.41 over 3 years, with 0.17 over the last year and 0.18 over 5 years.
Is WST a good diversifier for PLRX?
Yes, to a useful degree: a correlation of 0.41 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.41 mean?
A reading of 0.41 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/plrx-vs-wst.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/plrx-vs-wst/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PLRX correlations · WST correlations
