MCK vs RLI: Correlation
How closely do McKesson Corporation (MCK) and RLI Corp. (RLI) 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 MCK and RLI?
Over the past 3 years, MCK and RLI moved with a correlation of 0.45, which is moderate. The relationship has been stable: the 1-year correlation (0.48) sits close to the 3-year figure. Over 5 years the correlation is 0.40, and the annualized covariance of weekly returns is 251.8 %².
In MCK's tracked universe of 35 assets, RLI sits right near the top at #3. Correlation aside, the last 12 months split them widely, with MCK ahead by 28.9 points (+30.8% versus +1.9%).
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.
MCK vs RLI: side by side
| MCK (McKesson Corporation) | RLI (RLI Corp.) | |
|---|---|---|
| 1-year return | +30.8% | +1.9% |
| 5-year return | +354.8% | +46.7% |
| Volatility (ann.) | 25.1% | 22.2% |
| Beta vs S&P 500 | 0.16 | 0.18 |
| Max drawdown (3Y) | -27.2% | -43.5% |
| Market cap | $103.8B | $5.9B |
| P/E (trailing) | 24.0 | 13.5 |
| Dividend yield | 0.37% | 1.02% |
| Sector / category | Health Care | US Listed |
Year-by-year returns
| Year | MCK | RLI |
|---|---|---|
| 2022 | +51.8% | +24.8% |
| 2023 | +24.1% | +3.8% |
| 2024 | +23.7% | +27.6% |
| 2025 | +44.5% | -19.1% |
| 2026 | +8.8% | +5.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MCK and RLI 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 MCK and RLI?
Using weekly returns as of 2026-08-27: 0.45 over 3 years, with 0.48 over the last year and 0.40 over 5 years.
Is RLI a good diversifier for MCK?
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?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/mck-vs-rli.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/mck-vs-rli/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: MCK correlations · RLI correlations
