ASMB vs XBI: Correlation
How closely do Assembly Biosciences, Inc. (ASMB) and SPDR S&P Biotech ETF (XBI) trade together? Their weekly returns over three years give a correlation of 0.39, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ASMB and XBI?
Across a 3-year window, the weekly returns of ASMB and XBI correlate at 0.39, moderate. The relationship has been stable: the 1-year correlation (0.43) sits close to the 3-year figure. Stretching to 5 years gives 0.40, with an annualized covariance of 663.9 %².
XBI is one of the assets that tracks ASMB most closely: it ranks #2 out of the 11 assets we track against ASMB. Correlation aside, the last 12 months split them widely, with XBI ahead by 52.8 points (+34.4% versus +87.2%). Risk is not evenly split, since ASMB carries 2.2 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.
ASMB vs XBI: side by side
| ASMB (Assembly Biosciences, Inc.) | XBI (SPDR S&P Biotech ETF) | |
|---|---|---|
| 1-year return | +34.4% | +87.2% |
| 5-year return | -21.2% | +28.6% |
| Volatility (ann.) | 61.8% | 27.7% |
| Beta vs S&P 500 | 1.09 | 1.09 |
| Max drawdown (3Y) | -57.5% | -33.0% |
| Market cap | $0.7B | – |
| P/E (trailing) | 28.5 | – |
| Dividend yield | 0.00% | – |
| Sector / category | US Listed | ETF · Thematic |
Year-by-year returns
| Year | ASMB | XBI |
|---|---|---|
| 2022 | -44.2% | -25.9% |
| 2023 | -36.9% | +7.6% |
| 2024 | +60.4% | +1.0% |
| 2025 | +115.5% | +35.9% |
| 2026 | +2.3% | +38.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ASMB and XBI good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.39 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between ASMB and XBI?
Using weekly returns as of 2026-08-27: 0.39 over 3 years, with 0.43 over the last year and 0.40 over 5 years.
Is XBI a good diversifier for ASMB?
Yes, to a useful degree: a correlation of 0.39 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.39 mean?
On the −1 to +1 scale, 0.39 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/asmb-vs-xbi.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/asmb-vs-xbi/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: ASMB correlations · XBI correlations
