BCRX vs SPY: Correlation
Measured on weekly returns over the past three years, BioCryst Pharmaceuticals, Inc. (BCRX) and SPDR S&P 500 ETF Trust (SPY) carry a correlation of 0.23, a weak link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BCRX and SPY?
Over the past 3 years, BCRX and SPY moved with a correlation of 0.23, which is weak. Lately the two have drifted apart, with the 1-year correlation at 0.03 versus 0.23 over 3 years. Over 5 years the correlation is 0.23, and the annualized covariance of weekly returns is 155.7 %².
Among the 11 assets we track against BCRX, SPY sits near the bottom by co-movement, at rank #7. Twelve-month performance is nearly a tie, at +15.8% for BCRX and +20.6% for SPY. Risk is not evenly split, since BCRX carries 3.2 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.
BCRX vs SPY: side by side
| BCRX (BioCryst Pharmaceuticals, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | +15.8% | +20.6% |
| 5-year return | -37.1% | +82.4% |
| Volatility (ann.) | 47.1% | 14.5% |
| Beta vs S&P 500 | 0.75 | 1.00 |
| Max drawdown (3Y) | -46.0% | -18.8% |
| Market cap | $2.5B | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 1.01% |
| Expense ratio | – | 0.09% |
| Assets under management | – | $795.3B |
| Sector / category | US Listed | ETF · US Large Cap |
SPY is a Large Blend fund from State Street Investment Management: $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | BCRX | SPY |
|---|---|---|
| 2022 | -17.1% | -18.2% |
| 2023 | -47.8% | +26.2% |
| 2024 | +25.5% | +24.9% |
| 2025 | +3.7% | +17.7% |
| 2026 | +26.5% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BCRX and SPY good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.23 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between BCRX and SPY?
Using weekly returns as of 2026-08-27: 0.23 over 3 years, with 0.03 over the last year and 0.23 over 5 years.
Is SPY a good diversifier for BCRX?
Yes, to a useful degree: a correlation of 0.23 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.23 mean?
On the −1 to +1 scale, 0.23 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.
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Related comparisons
Hubs: BCRX correlations · SPY correlations
