MBRX vs WST: Correlation
Moleculin Biotech, Inc. (MBRX) and West Pharmaceutical Services (WST) show a negative relationship: their 3-year correlation of weekly returns is -0.32.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MBRX and WST?
Across a 3-year window, the weekly returns of MBRX and WST correlate at -0.32, negative, meaning they tend to move in opposite directions. The link has tightened recently: the 1-year correlation (0.04) runs above the 3-year figure (-0.32). Stretching to 5 years gives -0.19, with an annualized covariance of -1961.7 %².
WST is close to the least connected end of MBRX's tracked universe, ranking #12 of 13. Their recent paths diverged sharply: over the last 12 months WST outperformed by 136.6 percentage points (-95.5% for MBRX against +41.1% for WST). Risk is not evenly split, since MBRX carries 4.2 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.
MBRX vs WST: side by side
| MBRX (Moleculin Biotech, Inc.) | WST (West Pharmaceutical Services) | |
|---|---|---|
| 1-year return | -95.5% | +41.1% |
| 5-year return | -99.9% | -22.4% |
| Volatility (ann.) | 160.4% | 38.6% |
| Beta vs S&P 500 | 1.10 | 0.86 |
| Max drawdown (3Y) | -99.9% | -53.8% |
| Market cap | – | $24.4B |
| P/E (trailing) | 0.0 | 44.8 |
| Dividend yield | 0.00% | 0.25% |
| Sector / category | US Listed | Health Care |
Year-by-year returns
| Year | MBRX | WST |
|---|---|---|
| 2022 | -43.0% | -49.7% |
| 2023 | -19.1% | +50.0% |
| 2024 | -86.8% | -6.8% |
| 2025 | -92.2% | -15.7% |
| 2026 | -79.2% | +26.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MBRX and WST good diversifiers for each other?
Yes: at -0.32, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between MBRX and WST?
Using weekly returns as of 2026-08-27: -0.32 over 3 years, with 0.04 over the last year and -0.19 over 5 years.
Is WST a good diversifier for MBRX?
Yes: at -0.32, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.32 mean?
On the −1 to +1 scale, -0.32 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/mbrx-vs-wst.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/mbrx-vs-wst/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: MBRX correlations · WST correlations
