ISRG vs RDNT: Correlation
Intuitive Surgical (ISRG) and RadNet, Inc. (RDNT) show a moderate relationship: their 3-year correlation of weekly returns is 0.50.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ISRG and RDNT?
Across a 3-year window, the weekly returns of ISRG and RDNT correlate at 0.50, moderate. Recent behaviour matches the longer record: 0.60 over 1 year against 0.50 over 3. Stretching to 5 years gives 0.45, with an annualized covariance of 660.1 %².
Within ISRG's tracked universe of 36 assets, RDNT comes in at #17 by 3-year correlation. Correlation aside, the last 12 months split them widely, with RDNT ahead by 27.8 points (-22.1% versus +5.7%).
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.
ISRG vs RDNT: side by side
| ISRG (Intuitive Surgical) | RDNT (RadNet, Inc.) | |
|---|---|---|
| 1-year return | -22.1% | +5.7% |
| 5-year return | +4.0% | +146.0% |
| Volatility (ann.) | 31.1% | 42.6% |
| Beta vs S&P 500 | 1.20 | 1.29 |
| Max drawdown (3Y) | -45.6% | -46.8% |
| Market cap | $131.5B | $5.9B |
| P/E (trailing) | 42.5 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | Health Care | US Listed |
Year-by-year returns
| Year | ISRG | RDNT |
|---|---|---|
| 2022 | -26.1% | -37.5% |
| 2023 | +27.1% | +84.7% |
| 2024 | +54.7% | +100.9% |
| 2025 | +8.5% | +2.2% |
| 2026 | -35.2% | +5.6% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ISRG and RDNT good diversifiers for each other?
Only partially. A correlation of 0.50 means ISRG and RDNT share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between ISRG and RDNT?
Using weekly returns as of 2026-08-27: 0.50 over 3 years, with 0.60 over the last year and 0.45 over 5 years.
Is RDNT a good diversifier for ISRG?
Only partially. A correlation of 0.50 means ISRG and RDNT share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.50 mean?
On the −1 to +1 scale, 0.50 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/isrg-vs-rdnt.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/isrg-vs-rdnt/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: ISRG correlations · RDNT correlations
