BST vs QQQX: Correlation
How closely do BlackRock Science and Technology Trust (BST) and Nuveen NASDAQ 100 Dynamic Overwrite Fund - Closed End Fund (QQQX) trade together? Their weekly returns over three years give a correlation of 0.85, which is very strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BST and QQQX?
On 3 years of weekly data the BST/QQQX correlation comes out at 0.85, very strong, meaning they move nearly in lockstep. The relationship has been stable: the 1-year correlation (0.80) sits close to the 3-year figure. The 5-year figure is 0.86, and annualized covariance runs at 344.0 %².
Within BST's tracked universe of 25 assets, QQQX comes in at #4 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months BST outperformed by 16.3 percentage points (+40.7% for BST against +24.4% for QQQX).
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 QQQX: side by side
| BST (BlackRock Science and Technology Trust) | QQQX (Nuveen NASDAQ 100 Dynamic Overwrite Fund - Closed End Fund) | |
|---|---|---|
| 1-year return | +40.7% | +24.4% |
| 5-year return | +46.7% | +51.0% |
| Volatility (ann.) | 22.2% | 18.1% |
| Beta vs S&P 500 | 1.27 | 1.09 |
| Max drawdown (3Y) | -23.4% | -22.8% |
| Market cap | – | $1.5B |
| P/E (trailing) | 6.9 | 8.1 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BST | QQQX |
|---|---|---|
| 2022 | -38.3% | -27.4% |
| 2023 | +30.1% | +21.7% |
| 2024 | +18.0% | +25.6% |
| 2025 | +23.7% | +14.9% |
| 2026 | +30.9% | +13.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BST and QQQX good diversifiers for each other?
No. With a correlation of 0.85, BST and QQQX move nearly in lockstep, so holding both adds very little diversification.
FAQ
What is the correlation between BST and QQQX?
Using weekly returns as of 2026-08-27: 0.85 over 3 years, with 0.80 over the last year and 0.86 over 5 years.
Is QQQX a good diversifier for BST?
No. With a correlation of 0.85, BST and QQQX move nearly in lockstep, so holding both adds very little diversification.
What does a correlation of 0.85 mean?
On the −1 to +1 scale, 0.85 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-qqqx.json
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Related comparisons
Hubs: BST correlations · QQQX correlations
