BSX vs SPGI: Correlation
How closely do Boston Scientific (BSX) and S&P Global (SPGI) trade together? Their weekly returns over three years give a correlation of 0.43, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BSX and SPGI?
Over the past 3 years, BSX and SPGI moved with a correlation of 0.43, which is moderate. The relationship has been stable: the 1-year correlation (0.33) sits close to the 3-year figure. Over 5 years the correlation is 0.47, and the annualized covariance of weekly returns is 291.0 %².
Within BSX's tracked universe of 33 assets, SPGI comes in at #8 by 3-year correlation. The last year tells two different stories: SPGI led by 40.3 percentage points, -55.9% for BSX against -15.6% for SPGI. The rolling one-year correlation moved between 0.33 and 0.73 over the past three years, a moderate range.
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 SPGI: side by side
| BSX (Boston Scientific) | SPGI (S&P Global) | |
|---|---|---|
| 1-year return | -55.9% | -15.6% |
| 5-year return | +4.1% | +8.1% |
| Volatility (ann.) | 27.6% | 24.7% |
| Beta vs S&P 500 | 0.72 | 0.86 |
| Max drawdown (3Y) | -60.6% | -30.5% |
| Market cap | $67.6B | $128.4B |
| P/E (trailing) | 19.5 | 26.6 |
| Dividend yield | 0.00% | 0.88% |
| Sector / category | Health Care | Financials |
Year-by-year returns
| Year | BSX | SPGI |
|---|---|---|
| 2022 | +8.9% | -28.4% |
| 2023 | +24.9% | +32.8% |
| 2024 | +54.5% | +13.9% |
| 2025 | +6.8% | +5.7% |
| 2026 | -51.1% | -11.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BSX and SPGI good diversifiers for each other?
Reasonably. At 0.43, BSX and SPGI keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between BSX and SPGI?
The BSX/SPGI correlation stands at 0.43 on a 3-year window (1 year: 0.33, 5 years: 0.47), computed from weekly returns as of 2026-08-27.
Is SPGI a good diversifier for BSX?
Reasonably. At 0.43, BSX and SPGI keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.43 mean?
On the −1 to +1 scale, 0.43 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.
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Related comparisons
Hubs: BSX correlations · SPGI correlations
