BOLD vs RCUS: Correlation
How closely do Boundless Bio, Inc. (BOLD) and Arcus Biosciences, Inc. (RCUS) trade together? Their weekly returns over three years give a correlation of 0.45, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BOLD and RCUS?
Across a 3-year window, the weekly returns of BOLD and RCUS correlate at 0.45, moderate. Recent behaviour matches the longer record: 0.46 over 1 year against 0.45 over 3. Stretching to 5 years gives n/a, with an annualized covariance of 2382.3 %².
Within BOLD's tracked universe of 18 assets, RCUS comes in at #5 by 3-year correlation. Correlation aside, the last 12 months split them widely, with RCUS ahead by 38.8 points (+150.9% versus +189.7%). Note the risk asymmetry: BOLD runs 1.5 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.
BOLD vs RCUS: side by side
| BOLD (Boundless Bio, Inc.) | RCUS (Arcus Biosciences, Inc.) | |
|---|---|---|
| 1-year return | +150.9% | +189.7% |
| 5-year return | n/a | +3.1% |
| Volatility (ann.) | 90.9% | 59.0% |
| Beta vs S&P 500 | 1.60 | 1.71 |
| Max drawdown (3Y) | -92.9% | -69.5% |
| Market cap | $0.1B | $3.8B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BOLD | RCUS |
|---|---|---|
| 2022 | – | -48.9% |
| 2023 | – | -7.6% |
| 2024 | – | -22.0% |
| 2025 | -58.6% | +60.0% |
| 2026 | +138.3% | +28.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BOLD and RCUS good diversifiers for each other?
A fair diversifier. At 0.45, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between BOLD and RCUS?
As of 2026-08-27, the correlation of weekly returns between BOLD and RCUS is 0.45 over 3 years, 0.46 over 1 year and n/a over 5 years.
Is RCUS a good diversifier for BOLD?
A fair diversifier. At 0.45, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.45 mean?
On the −1 to +1 scale, 0.45 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-rcus.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/bold-vs-rcus/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: BOLD correlations · RCUS correlations
