BSX vs QQQ: Correlation
How closely do Boston Scientific (BSX) and Invesco QQQ Trust (QQQ) trade together? Their weekly returns over three years give a correlation of 0.32, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BSX and QQQ?
Across a 3-year window, the weekly returns of BSX and QQQ correlate at 0.32, moderate. The past 12 months show a weaker link (0.13) than the 3-year average (0.32). Stretching to 5 years gives 0.43, with an annualized covariance of 174.6 %².
Among the 33 assets we track against BSX, QQQ ranks #22 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months QQQ outperformed by 82.2 percentage points (-55.9% for BSX against +26.3% for QQQ). The relationship is regime-dependent: the rolling one-year correlation swung between 0.08 and 0.69 over the past three years, so this pair behaves very differently depending on the market environment.
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 QQQ: side by side
| BSX (Boston Scientific) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | -55.9% | +26.3% |
| 5-year return | +4.1% | +95.4% |
| Volatility (ann.) | 27.6% | 19.6% |
| Beta vs S&P 500 | 0.72 | 1.28 |
| Max drawdown (3Y) | -60.6% | -22.8% |
| Market cap | $67.6B | – |
| P/E (trailing) | 19.5 | – |
| Dividend yield | 0.00% | 0.44% |
| Expense ratio | – | 0.18% |
| Assets under management | – | $452.8B |
| Sector / category | Health Care | ETF · US Growth & Tech |
QQQ is a Large Growth fund from Invesco: $452.8B under management, 104 holdings, a 0.18% expense ratio, a 0.44% trailing dividend yield.
Year-by-year returns
| Year | BSX | QQQ |
|---|---|---|
| 2022 | +8.9% | -32.6% |
| 2023 | +24.9% | +54.9% |
| 2024 | +54.5% | +25.6% |
| 2025 | +6.8% | +20.8% |
| 2026 | -51.1% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BSX and QQQ good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.32 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between BSX and QQQ?
As of 2026-08-27, the correlation of weekly returns between BSX and QQQ is 0.32 over 3 years, 0.13 over 1 year and 0.43 over 5 years.
Is QQQ a good diversifier for BSX?
Yes, to a useful degree: a correlation of 0.32 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.32 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.
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Hubs: BSX correlations · QQQ correlations
