BOLD vs ZURA: Correlation
Measured on weekly returns over the past three years, Boundless Bio, Inc. (BOLD) and Zura Bio Limited - Class A (ZURA) carry a correlation of 0.42, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BOLD and ZURA?
Over the past 3 years, BOLD and ZURA moved with a correlation of 0.42, which is moderate. Recent behaviour matches the longer record: 0.43 over 1 year against 0.42 over 3. Over 5 years the correlation is n/a, and the annualized covariance of weekly returns is 3824.1 %².
Among the 18 assets we track against BOLD, ZURA ranks #7 by 3-year correlation. Correlation aside, the last 12 months split them widely, with ZURA ahead by 19.9 points (+150.9% versus +170.8%).
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.
BOLD vs ZURA: side by side
| BOLD (Boundless Bio, Inc.) | ZURA (Zura Bio Limited - Class A) | |
|---|---|---|
| 1-year return | +150.9% | +170.8% |
| 5-year return | n/a | n/a |
| Volatility (ann.) | 90.9% | 100.1% |
| Beta vs S&P 500 | 1.60 | 1.00 |
| Max drawdown (3Y) | -92.9% | -85.8% |
| Market cap | $0.1B | $0.6B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BOLD | ZURA |
|---|---|---|
| 2024 | – | -46.5% |
| 2025 | -58.6% | +109.6% |
| 2026 | +138.3% | +11.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BOLD and ZURA good diversifiers for each other?
Reasonably. At 0.42, BOLD and ZURA keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between BOLD and ZURA?
Using weekly returns as of 2026-08-27: 0.42 over 3 years, with 0.43 over the last year and n/a over 5 years.
Is ZURA a good diversifier for BOLD?
Reasonably. At 0.42, BOLD and ZURA keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.42 mean?
On the −1 to +1 scale, 0.42 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/bold-vs-zura.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/bold-vs-zura/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: BOLD correlations · ZURA correlations
