HUM vs WST: Correlation
Measured on weekly returns over the past three years, Humana (HUM) and West Pharmaceutical Services (WST) carry a correlation of 0.27, a weak link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are HUM and WST?
Over the past 3 years, HUM and WST moved with a correlation of 0.27, which is weak. Little has changed lately, as the 1-year reading of 0.31 lands near the 3-year figure. Over 5 years the correlation is 0.25, and the annualized covariance of weekly returns is 448.3 %².
By 3-year correlation, WST places #18 of the 30 assets tracked against HUM. The trailing year gives WST the advantage: +34.0% versus +41.1%, a 7.1-point spread. The relationship is regime-dependent: the rolling one-year correlation swung between -0.10 and 0.44 over the past three years, so this pair behaves very differently depending on the market environment.
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.
HUM vs WST: side by side
| HUM (Humana) | WST (West Pharmaceutical Services) | |
|---|---|---|
| 1-year return | +34.0% | +41.1% |
| 5-year return | +1.8% | -22.4% |
| Volatility (ann.) | 43.3% | 38.6% |
| Beta vs S&P 500 | 0.52 | 0.86 |
| Max drawdown (3Y) | -67.9% | -53.8% |
| Market cap | $47.1B | $24.4B |
| P/E (trailing) | 36.9 | 44.8 |
| Dividend yield | 0.91% | 0.25% |
| Sector / category | Health Care | Health Care |
Year-by-year returns
| Year | HUM | WST |
|---|---|---|
| 2022 | +11.2% | -49.7% |
| 2023 | -9.9% | +50.0% |
| 2024 | -44.0% | -6.8% |
| 2025 | +2.4% | -15.7% |
| 2026 | +54.4% | +26.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are HUM and WST good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.27 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between HUM and WST?
The HUM/WST correlation stands at 0.27 on a 3-year window (1 year: 0.31, 5 years: 0.25), computed from weekly returns as of 2026-08-27.
Is WST a good diversifier for HUM?
Yes, to a useful degree: a correlation of 0.27 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.27 mean?
On the −1 to +1 scale, 0.27 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/hum-vs-wst.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/hum-vs-wst/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: HUM correlations · WST correlations
