BIIB vs WST: Correlation
Biogen (BIIB) and West Pharmaceutical Services (WST) show a moderate relationship: their 3-year correlation of weekly returns is 0.36.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BIIB and WST?
Over the past 3 years, BIIB and WST moved with a correlation of 0.36, which is moderate. The relationship has been stable: the 1-year correlation (0.41) sits close to the 3-year figure. Over 5 years the correlation is 0.27, and the annualized covariance of weekly returns is 414.7 %².
Among the 32 assets we track against BIIB, WST ranks #20 by 3-year correlation. The last year tells two different stories: BIIB led by 21.3 percentage points, +62.4% for BIIB against +41.1% for WST. The rolling one-year correlation moved between -0.01 and 0.48 over the past three years, a moderate range.
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.
BIIB vs WST: side by side
| BIIB (Biogen) | WST (West Pharmaceutical Services) | |
|---|---|---|
| 1-year return | +62.4% | +41.1% |
| 5-year return | -35.7% | -22.4% |
| Volatility (ann.) | 30.1% | 38.6% |
| Beta vs S&P 500 | 0.53 | 0.86 |
| Max drawdown (3Y) | -57.7% | -53.8% |
| Market cap | $32.7B | $24.4B |
| P/E (trailing) | 39.2 | 44.8 |
| Dividend yield | 0.00% | 0.25% |
| Sector / category | Health Care | Health Care |
Year-by-year returns
| Year | BIIB | WST |
|---|---|---|
| 2022 | +15.4% | -49.7% |
| 2023 | -6.6% | +50.0% |
| 2024 | -40.9% | -6.8% |
| 2025 | +15.1% | -15.7% |
| 2026 | +25.9% | +26.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BIIB and WST good diversifiers for each other?
A fair diversifier. At 0.36, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between BIIB and WST?
Using weekly returns as of 2026-08-27: 0.36 over 3 years, with 0.41 over the last year and 0.27 over 5 years.
Is WST a good diversifier for BIIB?
A fair diversifier. At 0.36, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.36 mean?
A reading of 0.36 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/biib-vs-wst.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/biib-vs-wst/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: BIIB correlations · WST correlations
