CET vs ISRG: Correlation
Central Securities Corporation (CET) and Intuitive Surgical (ISRG) show a moderate relationship: their 3-year correlation of weekly returns is 0.56.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CET and ISRG?
Across a 3-year window, the weekly returns of CET and ISRG correlate at 0.56, moderate. Lately the two have drifted apart, with the 1-year correlation at 0.40 versus 0.56 over 3 years. Stretching to 5 years gives 0.57, with an annualized covariance of 220.8 %².
By 3-year correlation, ISRG places #14 of the 38 assets tracked against CET. Their recent paths diverged sharply: over the last 12 months CET outperformed by 37.8 percentage points (+15.7% for CET against -22.1% for ISRG). Note the risk asymmetry: ISRG runs 2.4 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
CET vs ISRG: side by side
| CET (Central Securities Corporation) | ISRG (Intuitive Surgical) | |
|---|---|---|
| 1-year return | +15.7% | -22.1% |
| 5-year return | +73.3% | +4.0% |
| Volatility (ann.) | 12.8% | 31.1% |
| Beta vs S&P 500 | 0.78 | 1.20 |
| Max drawdown (3Y) | -15.4% | -45.6% |
| Market cap | – | $131.5B |
| P/E (trailing) | 7.3 | 42.5 |
| Dividend yield | 5.03% | 0.00% |
| Sector / category | US Listed | Health Care |
Year-by-year returns
| Year | CET | ISRG |
|---|---|---|
| 2022 | -19.7% | -26.1% |
| 2023 | +19.2% | +27.1% |
| 2024 | +26.8% | +54.7% |
| 2025 | +17.2% | +8.5% |
| 2026 | +8.3% | -35.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CET and ISRG good diversifiers for each other?
Somewhat, no more. With 0.56 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between CET and ISRG?
Using weekly returns as of 2026-08-27: 0.56 over 3 years, with 0.40 over the last year and 0.57 over 5 years.
Is ISRG a good diversifier for CET?
Somewhat, no more. With 0.56 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.56 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/cet-vs-isrg.json
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Related comparisons
Hubs: CET correlations · ISRG correlations
