BSX vs ISRG: Correlation
How closely do Boston Scientific (BSX) and Intuitive Surgical (ISRG) trade together? Their weekly returns over three years give a correlation of 0.53, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BSX and ISRG?
On 3 years of weekly data the BSX/ISRG correlation comes out at 0.53, moderate. Little has changed lately, as the 1-year reading of 0.44 lands near the 3-year figure. The 5-year figure is 0.55, and annualized covariance runs at 454.2 %².
In BSX's tracked universe of 33 assets, ISRG sits right near the top at #1. Correlation aside, the last 12 months split them widely, with ISRG ahead by 33.8 points (-55.9% versus -22.1%). On a rolling one-year basis the correlation drifted between 0.38 and 0.75, a moderate band.
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.
BSX vs ISRG: side by side
| BSX (Boston Scientific) | ISRG (Intuitive Surgical) | |
|---|---|---|
| 1-year return | -55.9% | -22.1% |
| 5-year return | +4.1% | +4.0% |
| Volatility (ann.) | 27.6% | 31.1% |
| Beta vs S&P 500 | 0.72 | 1.20 |
| Max drawdown (3Y) | -60.6% | -45.6% |
| Market cap | $67.6B | $131.5B |
| P/E (trailing) | 19.5 | 42.5 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | Health Care | Health Care |
Year-by-year returns
| Year | BSX | ISRG |
|---|---|---|
| 2022 | +8.9% | -26.1% |
| 2023 | +24.9% | +27.1% |
| 2024 | +54.5% | +54.7% |
| 2025 | +6.8% | +8.5% |
| 2026 | -51.1% | -35.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BSX and ISRG good diversifiers for each other?
Only partially. A correlation of 0.53 means BSX and ISRG 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 BSX and ISRG?
Using weekly returns as of 2026-08-27: 0.53 over 3 years, with 0.44 over the last year and 0.55 over 5 years.
Is ISRG a good diversifier for BSX?
Only partially. A correlation of 0.53 means BSX and ISRG share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.53 mean?
A reading of 0.53 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/bsx-vs-isrg.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/bsx-vs-isrg/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: BSX correlations · ISRG correlations
