ACGL vs PACB: Correlation
How closely do Arch Capital Group (ACGL) and Pacific Biosciences of California, Inc. (PACB) trade together? Their weekly returns over three years give a correlation of -0.26, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACGL and PACB?
Across a 3-year window, the weekly returns of ACGL and PACB correlate at -0.26, negative, meaning they tend to move in opposite directions. The relationship has been stable: the 1-year correlation (-0.20) sits close to the 3-year figure. Stretching to 5 years gives -0.03, with an annualized covariance of -529.3 %².
Out of 36 assets tracked against ACGL, PACB lands near the bottom at #34. Over the last 12 months PACB came out ahead by 8.8 percentage points (+7.7% against +16.5%). Risk is not evenly split, since PACB carries 4.3 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.
ACGL vs PACB: side by side
| ACGL (Arch Capital Group) | PACB (Pacific Biosciences of California, Inc.) | |
|---|---|---|
| 1-year return | +7.7% | +16.5% |
| 5-year return | +151.8% | -94.9% |
| Volatility (ann.) | 21.5% | 93.3% |
| Beta vs S&P 500 | 0.28 | 1.21 |
| Max drawdown (3Y) | -22.4% | -92.2% |
| Market cap | $33.7B | $0.5B |
| P/E (trailing) | 7.9 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | Financials | US Listed |
Year-by-year returns
| Year | ACGL | PACB |
|---|---|---|
| 2022 | +41.2% | -60.0% |
| 2023 | +18.3% | +19.9% |
| 2024 | +30.8% | -81.3% |
| 2025 | +3.9% | +2.2% |
| 2026 | +3.0% | -17.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACGL and PACB good diversifiers for each other?
Yes. With a correlation of -0.26, ACGL and PACB have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between ACGL and PACB?
The ACGL/PACB correlation stands at -0.26 on a 3-year window (1 year: -0.20, 5 years: -0.03), computed from weekly returns as of 2026-08-27.
Is PACB a good diversifier for ACGL?
Yes. With a correlation of -0.26, ACGL and PACB have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.26 mean?
On the −1 to +1 scale, -0.26 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/acgl-vs-pacb.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/acgl-vs-pacb/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ACGL correlations · PACB correlations
