ACGL vs MCK: Correlation
Measured on weekly returns over the past three years, Arch Capital Group (ACGL) and McKesson Corporation (MCK) carry a correlation of 0.36, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ACGL and MCK?
Over the past 3 years, ACGL and MCK moved with a correlation of 0.36, which is moderate. The relationship has been stable: the 1-year correlation (0.38) sits close to the 3-year figure. Over 5 years the correlation is 0.39, and the annualized covariance of weekly returns is 193.6 %².
By 3-year correlation, MCK places #22 of the 36 assets tracked against ACGL. Their recent paths diverged sharply: over the last 12 months MCK outperformed by 23.1 percentage points (+7.7% for ACGL against +30.8% for MCK). On a rolling one-year basis the correlation drifted between 0.21 and 0.52, a moderate band.
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 MCK: side by side
| ACGL (Arch Capital Group) | MCK (McKesson Corporation) | |
|---|---|---|
| 1-year return | +7.7% | +30.8% |
| 5-year return | +151.8% | +354.8% |
| Volatility (ann.) | 21.5% | 25.1% |
| Beta vs S&P 500 | 0.28 | 0.16 |
| Max drawdown (3Y) | -22.4% | -27.2% |
| Market cap | $33.7B | $103.8B |
| P/E (trailing) | 7.9 | 24.0 |
| Dividend yield | 0.00% | 0.37% |
| Sector / category | Financials | Health Care |
Year-by-year returns
| Year | ACGL | MCK |
|---|---|---|
| 2022 | +41.2% | +51.8% |
| 2023 | +18.3% | +24.1% |
| 2024 | +30.8% | +23.7% |
| 2025 | +3.9% | +44.5% |
| 2026 | +3.0% | +8.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ACGL and MCK good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.36 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between ACGL and MCK?
The ACGL/MCK correlation stands at 0.36 on a 3-year window (1 year: 0.38, 5 years: 0.39), computed from weekly returns as of 2026-08-27.
Is MCK a good diversifier for ACGL?
Yes, to a useful degree: a correlation of 0.36 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.36 mean?
On the −1 to +1 scale, 0.36 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-mck.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/acgl-vs-mck/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ACGL correlations · MCK correlations
