GERN vs XBI: Correlation
Measured on weekly returns over the past three years, Geron Corporation (GERN) and SPDR S&P Biotech ETF (XBI) carry a correlation of 0.43, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are GERN and XBI?
Across a 3-year window, the weekly returns of GERN and XBI correlate at 0.43, moderate. The relationship has been stable: the 1-year correlation (0.47) sits close to the 3-year figure. Stretching to 5 years gives 0.49, with an annualized covariance of 760.3 %².
Few assets follow GERN as closely as XBI, which ranks #3 of 11 tracked partners. Correlation aside, the last 12 months split them widely, with XBI ahead by 78.7 points (+8.5% versus +87.2%). Risk is not evenly split, since GERN carries 2.3 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.
GERN vs XBI: side by side
| GERN (Geron Corporation) | XBI (SPDR S&P Biotech ETF) | |
|---|---|---|
| 1-year return | +8.5% | +87.2% |
| 5-year return | +6.2% | +28.6% |
| Volatility (ann.) | 64.0% | 27.7% |
| Beta vs S&P 500 | 1.34 | 1.09 |
| Max drawdown (3Y) | -79.0% | -33.0% |
| Market cap | $1.0B | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | – |
| Sector / category | US Listed | ETF · Thematic |
Year-by-year returns
| Year | GERN | XBI |
|---|---|---|
| 2022 | +98.4% | -25.9% |
| 2023 | -12.8% | +7.6% |
| 2024 | +67.8% | +1.0% |
| 2025 | -62.7% | +35.9% |
| 2026 | +15.9% | +38.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are GERN and XBI good diversifiers for each other?
A fair diversifier. At 0.43, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between GERN and XBI?
Using weekly returns as of 2026-08-27: 0.43 over 3 years, with 0.47 over the last year and 0.49 over 5 years.
Is XBI a good diversifier for GERN?
A fair diversifier. At 0.43, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.43 mean?
On the −1 to +1 scale, 0.43 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/gern-vs-xbi.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/gern-vs-xbi/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: GERN correlations · XBI correlations
