BST vs BSTZ: Correlation
How closely do BlackRock Science and Technology Trust (BST) and BlackRock Science and Technology Term Trust (BSTZ) trade together? Their weekly returns over three years give a correlation of 0.80, which is very strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BST and BSTZ?
Across a 3-year window, the weekly returns of BST and BSTZ correlate at 0.80, very strong, meaning they move nearly in lockstep. Recent behaviour matches the longer record: 0.75 over 1 year against 0.80 over 3. Stretching to 5 years gives 0.83, with an annualized covariance of 420.1 %².
Within BST's tracked universe of 25 assets, BSTZ comes in at #8 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months BSTZ outperformed by 16.7 percentage points (+40.7% for BST against +57.4% for BSTZ).
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.
BST vs BSTZ: side by side
| BST (BlackRock Science and Technology Trust) | BSTZ (BlackRock Science and Technology Term Trust) | |
|---|---|---|
| 1-year return | +40.7% | +57.4% |
| 5-year return | +46.7% | +31.6% |
| Volatility (ann.) | 22.2% | 23.7% |
| Beta vs S&P 500 | 1.27 | 1.19 |
| Max drawdown (3Y) | -23.4% | -25.3% |
| Market cap | – | $2.1B |
| P/E (trailing) | 6.9 | 6.7 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BST | BSTZ |
|---|---|---|
| 2022 | -38.3% | -55.3% |
| 2023 | +30.1% | +18.7% |
| 2024 | +18.0% | +37.5% |
| 2025 | +23.7% | +25.1% |
| 2026 | +30.9% | +44.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BST and BSTZ good diversifiers for each other?
Not really. At 0.80, the two trade almost as one position, and owning both buys little extra protection.
FAQ
What is the correlation between BST and BSTZ?
As of 2026-08-27, the correlation of weekly returns between BST and BSTZ is 0.80 over 3 years, 0.75 over 1 year and 0.83 over 5 years.
Is BSTZ a good diversifier for BST?
Not really. At 0.80, the two trade almost as one position, and owning both buys little extra protection.
What does a correlation of 0.80 mean?
On the −1 to +1 scale, 0.80 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/bst-vs-bstz.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/bst-vs-bstz/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: BST correlations · BSTZ correlations
