BSX vs CET: Correlation
Boston Scientific (BSX) and Central Securities Corporation (CET) show a moderate relationship: their 3-year correlation of weekly returns is 0.42.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BSX and CET?
On 3 years of weekly data the BSX/CET correlation comes out at 0.42, moderate. Lately the two have drifted apart, with the 1-year correlation at 0.25 versus 0.42 over 3 years. The 5-year figure is 0.46, and annualized covariance runs at 147.9 %².
Among the 33 assets we track against BSX, CET ranks #10 by 3-year correlation. The last year tells two different stories: CET led by 71.6 percentage points, -55.9% for BSX against +15.7% for CET. One caveat on sizing: BSX is 2.2 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.
BSX vs CET: side by side
| BSX (Boston Scientific) | CET (Central Securities Corporation) | |
|---|---|---|
| 1-year return | -55.9% | +15.7% |
| 5-year return | +4.1% | +73.3% |
| Volatility (ann.) | 27.6% | 12.8% |
| Beta vs S&P 500 | 0.72 | 0.78 |
| Max drawdown (3Y) | -60.6% | -15.4% |
| Market cap | $67.6B | – |
| P/E (trailing) | 19.5 | 7.3 |
| Dividend yield | 0.00% | 5.03% |
| Sector / category | Health Care | US Listed |
Year-by-year returns
| Year | BSX | CET |
|---|---|---|
| 2022 | +8.9% | -19.7% |
| 2023 | +24.9% | +19.2% |
| 2024 | +54.5% | +26.8% |
| 2025 | +6.8% | +17.2% |
| 2026 | -51.1% | +8.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BSX and CET good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.42 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between BSX and CET?
Using weekly returns as of 2026-08-27: 0.42 over 3 years, with 0.25 over the last year and 0.46 over 5 years.
Is CET a good diversifier for BSX?
Yes, to a useful degree: a correlation of 0.42 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.42 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
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Related comparisons
Hubs: BSX correlations · CET correlations
