ALAB vs BSTZ: Correlation
Measured on weekly returns over the past three years, Astera Labs, Inc. (ALAB) and BlackRock Science and Technology Term Trust (BSTZ) carry a correlation of 0.56, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ALAB and BSTZ?
Across a 3-year window, the weekly returns of ALAB and BSTZ correlate at 0.56, moderate. Little has changed lately, as the 1-year reading of 0.59 lands near the 3-year figure. Stretching to 5 years gives n/a, with an annualized covariance of 1113.8 %².
BSTZ is one of the assets that tracks ALAB most closely: it ranks #3 out of the 18 assets we track against ALAB. On 12-month performance ALAB holds a 12.3-point edge, +69.7% against +57.4%. Risk is not evenly split, since ALAB carries 3.6 times the volatility of the other side.
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.
ALAB vs BSTZ: side by side
| ALAB (Astera Labs, Inc.) | BSTZ (BlackRock Science and Technology Term Trust) | |
|---|---|---|
| 1-year return | +69.7% | +57.4% |
| 5-year return | n/a | +31.6% |
| Volatility (ann.) | 84.6% | 23.7% |
| Beta vs S&P 500 | 2.90 | 1.19 |
| Max drawdown (3Y) | -63.7% | -25.3% |
| Market cap | $52.8B | $2.1B |
| P/E (trailing) | 142.8 | 6.7 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ALAB | BSTZ |
|---|---|---|
| 2022 | – | -55.3% |
| 2023 | – | +18.7% |
| 2024 | – | +37.5% |
| 2025 | +25.6% | +25.1% |
| 2026 | +82.8% | +44.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ALAB and BSTZ good diversifiers for each other?
Only partially. A correlation of 0.56 means ALAB and BSTZ share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between ALAB and BSTZ?
As of 2026-08-27, the correlation of weekly returns between ALAB and BSTZ is 0.56 over 3 years, 0.59 over 1 year and n/a over 5 years.
Is BSTZ a good diversifier for ALAB?
Only partially. A correlation of 0.56 means ALAB and BSTZ share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.56 mean?
On the −1 to +1 scale, 0.56 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/alab-vs-bstz.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/alab-vs-bstz/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: ALAB correlations · BSTZ correlations
