MCK vs ORI: Correlation
How closely do McKesson Corporation (MCK) and Old Republic International Corporation (ORI) trade together? Their weekly returns over three years give a correlation of 0.42, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MCK and ORI?
Over the past 3 years, MCK and ORI moved with a correlation of 0.42, 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 0.39, and the annualized covariance of weekly returns is 220.4 %².
By 3-year correlation, ORI places #5 of the 35 assets tracked against MCK. The last year tells two different stories: MCK led by 15.8 percentage points, +30.8% for MCK against +15.0% for ORI.
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 ORI: side by side
| MCK (McKesson Corporation) | ORI (Old Republic International Corporation) | |
|---|---|---|
| 1-year return | +30.8% | +15.0% |
| 5-year return | +354.8% | +137.4% |
| Volatility (ann.) | 25.1% | 21.1% |
| Beta vs S&P 500 | 0.16 | 0.28 |
| Max drawdown (3Y) | -27.2% | -16.2% |
| Market cap | $103.8B | $10.2B |
| P/E (trailing) | 24.0 | 9.3 |
| Dividend yield | 0.37% | 2.85% |
| Sector / category | Health Care | US Listed |
Year-by-year returns
| Year | MCK | ORI |
|---|---|---|
| 2022 | +51.8% | +6.7% |
| 2023 | +24.1% | +26.3% |
| 2024 | +23.7% | +27.1% |
| 2025 | +44.5% | +37.5% |
| 2026 | +8.8% | -0.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MCK and ORI good diversifiers for each other?
Reasonably. At 0.42, MCK and ORI keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between MCK and ORI?
As of 2026-08-27, the correlation of weekly returns between MCK and ORI is 0.42 over 3 years, 0.48 over 1 year and 0.39 over 5 years.
Is ORI a good diversifier for MCK?
Reasonably. At 0.42, MCK and ORI keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.42 mean?
A reading of 0.42 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/mck-vs-ori.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/mck-vs-ori/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: MCK correlations · ORI correlations
