IRTC vs PHR: Correlation
Measured on weekly returns over the past three years, iRhythm Holdings, Inc. (IRTC) and Phreesia, Inc. (PHR) carry a correlation of 0.38, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are IRTC and PHR?
Across a 3-year window, the weekly returns of IRTC and PHR correlate at 0.38, moderate. The relationship has been stable: the 1-year correlation (0.42) sits close to the 3-year figure. Stretching to 5 years gives 0.35, with an annualized covariance of 1092.2 %².
Among the 10 assets we track against IRTC, PHR ranks #5 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months IRTC outperformed by 31.4 percentage points (-31.5% for IRTC against -62.9% for PHR).
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.
IRTC vs PHR: side by side
| IRTC (iRhythm Holdings, Inc.) | PHR (Phreesia, Inc.) | |
|---|---|---|
| 1-year return | -31.5% | -62.9% |
| 5-year return | +150.2% | -83.5% |
| Volatility (ann.) | 50.1% | 57.6% |
| Beta vs S&P 500 | 0.87 | 1.57 |
| Max drawdown (3Y) | -53.8% | -75.2% |
| Market cap | $3.8B | $0.7B |
| P/E (trailing) | – | 74.1 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | IRTC | PHR |
|---|---|---|
| 2022 | -20.4% | -22.3% |
| 2023 | +14.3% | -28.5% |
| 2024 | -15.8% | +8.7% |
| 2025 | +96.8% | -32.8% |
| 2026 | -34.4% | -29.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are IRTC and PHR good diversifiers for each other?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between IRTC and PHR?
As of 2026-08-27, the correlation of weekly returns between IRTC and PHR is 0.38 over 3 years, 0.42 over 1 year and 0.35 over 5 years.
Is PHR a good diversifier for IRTC?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.38 mean?
On the −1 to +1 scale, 0.38 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/irtc-vs-phr.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/irtc-vs-phr/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: IRTC correlations · PHR correlations
