BSTZ vs EW: Correlation
BlackRock Science and Technology Term Trust (BSTZ) and Edwards Lifesciences (EW) show a moderate relationship: their 3-year correlation of weekly returns is 0.38.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BSTZ and EW?
On 3 years of weekly data the BSTZ/EW correlation comes out at 0.38, moderate. The relationship has been stable: the 1-year correlation (0.29) sits close to the 3-year figure. The 5-year figure is 0.43, and annualized covariance runs at 285.2 %².
Among the 21 assets we track against BSTZ, EW sits near the bottom by co-movement, at rank #18. Correlation aside, the last 12 months split them widely, with BSTZ ahead by 46.2 points (+57.4% versus +11.2%).
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.
BSTZ vs EW: side by side
| BSTZ (BlackRock Science and Technology Term Trust) | EW (Edwards Lifesciences) | |
|---|---|---|
| 1-year return | +57.4% | +11.2% |
| 5-year return | +31.6% | -23.8% |
| Volatility (ann.) | 23.7% | 31.6% |
| Beta vs S&P 500 | 1.19 | 0.81 |
| Max drawdown (3Y) | -25.3% | -37.5% |
| Market cap | $2.1B | $51.8B |
| P/E (trailing) | 6.7 | 54.2 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | Health Care |
Year-by-year returns
| Year | BSTZ | EW |
|---|---|---|
| 2022 | -55.3% | -42.4% |
| 2023 | +18.7% | +2.2% |
| 2024 | +37.5% | -2.9% |
| 2025 | +25.1% | +15.2% |
| 2026 | +44.7% | +5.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BSTZ and EW good diversifiers for each other?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between BSTZ and EW?
As of 2026-08-27, the correlation of weekly returns between BSTZ and EW is 0.38 over 3 years, 0.29 over 1 year and 0.43 over 5 years.
Is EW a good diversifier for BSTZ?
A fair diversifier. At 0.38, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.38 mean?
On the −1 to +1 scale, 0.38 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.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/bstz-vs-ew.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/bstz-vs-ew/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: BSTZ correlations · EW correlations
