BOLD vs SLS: Correlation
How closely do Boundless Bio, Inc. (BOLD) and SELLAS Life Sciences Group, Inc. (SLS) trade together? Their weekly returns over three years give a correlation of 0.35, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BOLD and SLS?
Across a 3-year window, the weekly returns of BOLD and SLS correlate at 0.35, moderate. Lately the two have moved closer together, with the 1-year correlation at 0.48 versus 0.35 over 3 years. Stretching to 5 years gives n/a, with an annualized covariance of 3178.5 %².
Within BOLD's tracked universe of 18 assets, SLS comes in at #12 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months SLS outperformed by 541.3 percentage points (+150.9% for BOLD against +692.2% for SLS).
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 SLS: side by side
| BOLD (Boundless Bio, Inc.) | SLS (SELLAS Life Sciences Group, Inc.) | |
|---|---|---|
| 1-year return | +150.9% | +692.2% |
| 5-year return | n/a | +65.0% |
| Volatility (ann.) | 90.9% | 101.2% |
| Beta vs S&P 500 | 1.60 | 0.79 |
| Max drawdown (3Y) | -92.9% | -72.0% |
| Market cap | $0.1B | $3.1B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BOLD | SLS |
|---|---|---|
| 2022 | – | -57.3% |
| 2023 | – | -55.1% |
| 2024 | – | -1.9% |
| 2025 | -58.6% | +262.5% |
| 2026 | +138.3% | +303.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BOLD and SLS good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.35 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between BOLD and SLS?
Using weekly returns as of 2026-08-27: 0.35 over 3 years, with 0.48 over the last year and n/a over 5 years.
Is SLS a good diversifier for BOLD?
Yes, to a useful degree: a correlation of 0.35 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.35 mean?
On the −1 to +1 scale, 0.35 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-sls.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/bold-vs-sls/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: BOLD correlations · SLS correlations
