ARCT vs XBI: Correlation
How closely do Arcturus Therapeutics Holdings Inc. (ARCT) and SPDR S&P Biotech ETF (XBI) trade together? Their weekly returns over three years give a correlation of 0.51, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ARCT and XBI?
Over the past 3 years, ARCT and XBI moved with a correlation of 0.51, which is moderate. The link has loosened recently: the 1-year correlation (0.37) runs below the 3-year figure (0.51). Over 5 years the correlation is 0.54, and the annualized covariance of weekly returns is 1285.9 %².
Among the 14 assets we track against ARCT, XBI ranks #5 by 3-year correlation. Correlation aside, the last 12 months split them widely, with XBI ahead by 93.7 points (-6.5% versus +87.2%). One caveat on sizing: ARCT is 3.3 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
ARCT vs XBI: side by side
| ARCT (Arcturus Therapeutics Holdings Inc.) | XBI (SPDR S&P Biotech ETF) | |
|---|---|---|
| 1-year return | -6.5% | +87.2% |
| 5-year return | -69.9% | +28.6% |
| Volatility (ann.) | 90.6% | 27.7% |
| Beta vs S&P 500 | 2.39 | 1.09 |
| Max drawdown (3Y) | -87.5% | -33.0% |
| Market cap | $0.5B | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | – |
| Sector / category | US Listed | ETF · Thematic |
Year-by-year returns
| Year | ARCT | XBI |
|---|---|---|
| 2022 | -54.2% | -25.9% |
| 2023 | +85.9% | +7.6% |
| 2024 | -46.2% | +1.0% |
| 2025 | -63.9% | +35.9% |
| 2026 | +163.8% | +38.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ARCT and XBI good diversifiers for each other?
Only partially. A correlation of 0.51 means ARCT and XBI share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between ARCT and XBI?
Using weekly returns as of 2026-08-27: 0.51 over 3 years, with 0.37 over the last year and 0.54 over 5 years.
Is XBI a good diversifier for ARCT?
Only partially. A correlation of 0.51 means ARCT and XBI share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.51 mean?
A reading of 0.51 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
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Related comparisons
Hubs: ARCT correlations · XBI correlations
