ACET vs XBI: Correlation
Adicet Bio, Inc. (ACET) and SPDR S&P Biotech ETF (XBI) show a moderate relationship: their 3-year correlation of weekly returns is 0.48.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACET and XBI?
Over the past 3 years, ACET and XBI moved with a correlation of 0.48, which is moderate. Lately the two have drifted apart, with the 1-year correlation at 0.35 versus 0.48 over 3 years. Over 5 years the correlation is 0.46, and the annualized covariance of weekly returns is 1060.7 %².
Few assets follow ACET as closely as XBI, which ranks #3 of 15 tracked partners. The last year tells two different stories: XBI led by 112.7 percentage points, -25.5% for ACET against +87.2% for XBI. Note the risk asymmetry: ACET runs 2.9 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
ACET vs XBI: side by side
| ACET (Adicet Bio, Inc.) | XBI (SPDR S&P Biotech ETF) | |
|---|---|---|
| 1-year return | -25.5% | +87.2% |
| 5-year return | -93.0% | +28.6% |
| Volatility (ann.) | 80.6% | 27.7% |
| Beta vs S&P 500 | 1.88 | 1.09 |
| Max drawdown (3Y) | -88.9% | -33.0% |
| Market cap | $0.1B | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | – |
| Sector / category | US Listed | ETF · Thematic |
Year-by-year returns
| Year | ACET | XBI |
|---|---|---|
| 2022 | -48.9% | -25.9% |
| 2023 | -78.9% | +7.6% |
| 2024 | -49.1% | +1.0% |
| 2025 | -45.3% | +35.9% |
| 2026 | +7.0% | +38.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACET and XBI good diversifiers for each other?
A fair diversifier. At 0.48, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between ACET and XBI?
Using weekly returns as of 2026-08-27: 0.48 over 3 years, with 0.35 over the last year and 0.46 over 5 years.
Is XBI a good diversifier for ACET?
A fair diversifier. At 0.48, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.48 mean?
On the −1 to +1 scale, 0.48 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/acet-vs-xbi.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/acet-vs-xbi/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: ACET correlations · XBI correlations
