BLFS vs XBI: Correlation
BioLife Solutions, Inc. (BLFS) and SPDR S&P Biotech ETF (XBI) show a strong relationship: their 3-year correlation of weekly returns is 0.60.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BLFS and XBI?
On 3 years of weekly data the BLFS/XBI correlation comes out at 0.60, strong. The past 12 months show a weaker link (0.44) than the 3-year average (0.60). The 5-year figure is 0.61, and annualized covariance runs at 833.1 %².
By 3-year correlation, XBI places #5 of the 15 assets tracked against BLFS. Their recent paths diverged sharply: over the last 12 months XBI outperformed by 40.9 percentage points (+46.3% for BLFS against +87.2% for XBI). Risk is not evenly split, since BLFS carries 1.8 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.
BLFS vs XBI: side by side
| BLFS (BioLife Solutions, Inc.) | XBI (SPDR S&P Biotech ETF) | |
|---|---|---|
| 1-year return | +46.3% | +87.2% |
| 5-year return | -36.2% | +28.6% |
| Volatility (ann.) | 50.1% | 27.7% |
| Beta vs S&P 500 | 1.66 | 1.09 |
| Max drawdown (3Y) | -37.0% | -33.0% |
| Market cap | $1.8B | – |
| P/E (trailing) | 37.2 | – |
| Dividend yield | 0.00% | – |
| Sector / category | US Listed | ETF · Thematic |
Year-by-year returns
| Year | BLFS | XBI |
|---|---|---|
| 2022 | -51.2% | -25.9% |
| 2023 | -10.7% | +7.6% |
| 2024 | +59.8% | +1.0% |
| 2025 | -6.9% | +35.9% |
| 2026 | +53.8% | +38.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BLFS and XBI good diversifiers for each other?
To a limited degree. At 0.60 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between BLFS and XBI?
The BLFS/XBI correlation stands at 0.60 on a 3-year window (1 year: 0.44, 5 years: 0.61), computed from weekly returns as of 2026-08-27.
Is XBI a good diversifier for BLFS?
To a limited degree. At 0.60 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.60 mean?
A reading of 0.60 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/blfs-vs-xbi.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/blfs-vs-xbi/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: BLFS correlations · XBI correlations
