AMBA vs BSTZ: Correlation
How closely do Ambarella, Inc. (AMBA) and BlackRock Science and Technology Term Trust (BSTZ) trade together? Their weekly returns over three years give a correlation of 0.55, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AMBA and BSTZ?
Over the past 3 years, AMBA and BSTZ moved with a correlation of 0.55, which is moderate. The link has loosened recently: the 1-year correlation (0.37) runs below the 3-year figure (0.55). Over 5 years the correlation is 0.54, and the annualized covariance of weekly returns is 775.1 %².
Few assets follow AMBA as closely as BSTZ, which ranks #1 of 10 tracked partners. Their recent paths diverged sharply: over the last 12 months BSTZ outperformed by 58.5 percentage points (-1.1% for AMBA against +57.4% for BSTZ). One caveat on sizing: AMBA is 2.5 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
AMBA vs BSTZ: side by side
| AMBA (Ambarella, Inc.) | BSTZ (BlackRock Science and Technology Term Trust) | |
|---|---|---|
| 1-year return | -1.1% | +57.4% |
| 5-year return | -32.5% | +31.6% |
| Volatility (ann.) | 59.8% | 23.7% |
| Beta vs S&P 500 | 2.14 | 1.19 |
| Max drawdown (3Y) | -51.4% | -25.3% |
| Market cap | $3.1B | $2.1B |
| P/E (trailing) | – | 6.7 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | AMBA | BSTZ |
|---|---|---|
| 2022 | -59.5% | -55.3% |
| 2023 | -25.5% | +18.7% |
| 2024 | +18.7% | +37.5% |
| 2025 | -2.6% | +25.1% |
| 2026 | +0.5% | +44.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AMBA and BSTZ good diversifiers for each other?
Only partially. A correlation of 0.55 means AMBA 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 AMBA and BSTZ?
The AMBA/BSTZ correlation stands at 0.55 on a 3-year window (1 year: 0.37, 5 years: 0.54), computed from weekly returns as of 2026-08-27.
Is BSTZ a good diversifier for AMBA?
Only partially. A correlation of 0.55 means AMBA 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 0.55 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/amba-vs-bstz.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/amba-vs-bstz/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: AMBA correlations · BSTZ correlations
