BIIB vs VRTX: Correlation
Biogen (BIIB) and Vertex Pharmaceuticals (VRTX) show a moderate relationship: their 3-year correlation of weekly returns is 0.38.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BIIB and VRTX?
Across a 3-year window, the weekly returns of BIIB and VRTX correlate at 0.38, moderate. Recent behaviour matches the longer record: 0.47 over 1 year against 0.38 over 3. Stretching to 5 years gives 0.38, with an annualized covariance of 346.5 %².
By 3-year correlation, VRTX places #17 of the 32 assets tracked against BIIB. Correlation aside, the last 12 months split them widely, with BIIB ahead by 21.7 points (+62.4% versus +40.7%). On a rolling one-year basis the correlation drifted between 0.23 and 0.55, a moderate band.
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 VRTX: side by side
| BIIB (Biogen) | VRTX (Vertex Pharmaceuticals) | |
|---|---|---|
| 1-year return | +62.4% | +40.7% |
| 5-year return | -35.7% | +174.5% |
| Volatility (ann.) | 30.1% | 30.3% |
| Beta vs S&P 500 | 0.53 | 0.55 |
| Max drawdown (3Y) | -57.7% | -29.1% |
| Market cap | $32.7B | $138.8B |
| P/E (trailing) | 39.2 | 31.9 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | Health Care | Health Care |
Year-by-year returns
| Year | BIIB | VRTX |
|---|---|---|
| 2022 | +15.4% | +31.5% |
| 2023 | -6.6% | +40.9% |
| 2024 | -40.9% | -1.0% |
| 2025 | +15.1% | +12.6% |
| 2026 | +25.9% | +20.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BIIB and VRTX good diversifiers for each other?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between BIIB and VRTX?
As of 2026-08-27, the correlation of weekly returns between BIIB and VRTX is 0.38 over 3 years, 0.47 over 1 year and 0.38 over 5 years.
Is VRTX a good diversifier for BIIB?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.38 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/biib-vs-vrtx.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/biib-vs-vrtx/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: BIIB correlations · VRTX correlations
