HELE vs PROK: Correlation
How closely do Helen of Troy Limited (HELE) and ProKidney Corp. - Class A (PROK) trade together? Their weekly returns over three years give a correlation of -0.27, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are HELE and PROK?
Over the past 3 years, HELE and PROK moved with a correlation of -0.27, which is negative, meaning they tend to move in opposite directions. The link has tightened recently: the 1-year correlation (-0.03) runs above the 3-year figure (-0.27). Over 5 years the correlation is -0.22, and the annualized covariance of weekly returns is -5619.2 %².
Out of 11 assets tracked against HELE, PROK lands near the bottom at #10. The last year tells two different stories: HELE led by 42.3 percentage points, +15.4% for HELE against -26.9% for PROK. One caveat on sizing: PROK is 6.5 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
HELE vs PROK: side by side
| HELE (Helen of Troy Limited) | PROK (ProKidney Corp. - Class A) | |
|---|---|---|
| 1-year return | +15.4% | -26.9% |
| 5-year return | -87.9% | -81.3% |
| Volatility (ann.) | 57.0% | 368.1% |
| Beta vs S&P 500 | 1.05 | 2.21 |
| Max drawdown (3Y) | -89.0% | -94.3% |
| Market cap | $0.7B | $0.7B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | HELE | PROK |
|---|---|---|
| 2022 | -54.6% | -30.7% |
| 2023 | +8.9% | -74.1% |
| 2024 | -50.5% | -5.1% |
| 2025 | -64.5% | +32.5% |
| 2026 | +36.1% | -18.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are HELE and PROK good diversifiers for each other?
By historical standards, yes. A correlation of -0.27 means the two rarely move for the same reasons.
FAQ
What is the correlation between HELE and PROK?
As of 2026-08-27, the correlation of weekly returns between HELE and PROK is -0.27 over 3 years, -0.03 over 1 year and -0.22 over 5 years.
Is PROK a good diversifier for HELE?
By historical standards, yes. A correlation of -0.27 means the two rarely move for the same reasons.
What does a correlation of -0.27 mean?
A reading of -0.27 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/hele-vs-prok.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/hele-vs-prok/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: HELE correlations · PROK correlations
