BST vs NCZ: Correlation
BlackRock Science and Technology Trust (BST) and Virtus Convertible & Income Fund II (NCZ) show a strong relationship: their 3-year correlation of weekly returns is 0.78.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BST and NCZ?
Across a 3-year window, the weekly returns of BST and NCZ correlate at 0.78, strong. Recent behaviour matches the longer record: 0.79 over 1 year against 0.78 over 3. Stretching to 5 years gives 0.77, with an annualized covariance of 325.4 %².
By 3-year correlation, NCZ places #9 of the 25 assets tracked against BST. Over the last 12 months BST came out ahead by 12.5 percentage points (+40.7% against +28.2%).
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.
BST vs NCZ: side by side
| BST (BlackRock Science and Technology Trust) | NCZ (Virtus Convertible & Income Fund II) | |
|---|---|---|
| 1-year return | +40.7% | +28.2% |
| 5-year return | +46.7% | +29.5% |
| Volatility (ann.) | 22.2% | 18.8% |
| Beta vs S&P 500 | 1.27 | 0.94 |
| Max drawdown (3Y) | -23.4% | -19.5% |
| Market cap | – | $0.3B |
| P/E (trailing) | 6.9 | 4.3 |
| Dividend yield | 0.00% | 9.33% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BST | NCZ |
|---|---|---|
| 2022 | -38.3% | -35.8% |
| 2023 | +30.1% | +17.8% |
| 2024 | +18.0% | +18.4% |
| 2025 | +23.7% | +23.2% |
| 2026 | +30.9% | +21.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BST and NCZ good diversifiers for each other?
To a limited degree. At 0.78 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between BST and NCZ?
The BST/NCZ correlation stands at 0.78 on a 3-year window (1 year: 0.79, 5 years: 0.77), computed from weekly returns as of 2026-08-27.
Is NCZ a good diversifier for BST?
To a limited degree. At 0.78 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.78 mean?
A reading of 0.78 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/bst-vs-ncz.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/bst-vs-ncz/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: BST correlations · NCZ correlations
