BRK.B vs CSBR: Correlation
Measured on weekly returns over the past three years, Berkshire Hathaway (BRK.B) and Champions Oncology, Inc. (CSBR) carry a correlation of -0.21, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BRK.B and CSBR?
Across a 3-year window, the weekly returns of BRK.B and CSBR correlate at -0.21, negative, meaning they tend to move in opposite directions. Recent behaviour matches the longer record: -0.19 over 1 year against -0.21 over 3. Stretching to 5 years gives -0.06, with an annualized covariance of -187.8 %².
Among the 31 assets we track against BRK.B, CSBR sits near the bottom by co-movement, at rank #28. The last year tells two different stories: BRK.B led by 25.5 percentage points, +1.6% for BRK.B against -23.9% for CSBR. Note the risk asymmetry: CSBR runs 3.5 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.
BRK.B vs CSBR: side by side
| BRK.B (Berkshire Hathaway) | CSBR (Champions Oncology, Inc.) | |
|---|---|---|
| 1-year return | +1.6% | -23.9% |
| 5-year return | +76.3% | -49.7% |
| Volatility (ann.) | 15.9% | 55.9% |
| Beta vs S&P 500 | 0.43 | 0.24 |
| Max drawdown (3Y) | -14.9% | -57.9% |
| Market cap | $1,078.3B | $0.1B |
| P/E (trailing) | 12.7 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | Financials | US Listed |
Year-by-year returns
| Year | BRK.B | CSBR |
|---|---|---|
| 2022 | +3.3% | -46.1% |
| 2023 | +15.5% | +24.6% |
| 2024 | +27.1% | +52.5% |
| 2025 | +10.9% | -19.4% |
| 2026 | +0.2% | -27.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BRK.B and CSBR good diversifiers for each other?
By historical standards, yes. A correlation of -0.21 means the two rarely move for the same reasons.
FAQ
What is the correlation between BRK.B and CSBR?
The BRK.B/CSBR correlation stands at -0.21 on a 3-year window (1 year: -0.19, 5 years: -0.06), computed from weekly returns as of 2026-08-27.
Is CSBR a good diversifier for BRK.B?
By historical standards, yes. A correlation of -0.21 means the two rarely move for the same reasons.
What does a correlation of -0.21 mean?
A reading of -0.21 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/brk-b-vs-csbr.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/brk-b-vs-csbr/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: BRK.B correlations · CSBR correlations
