AMSC vs BSTZ: Correlation
Measured on weekly returns over the past three years, American Superconductor Corporation (AMSC) and BlackRock Science and Technology Term Trust (BSTZ) carry a correlation of 0.50, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AMSC and BSTZ?
On 3 years of weekly data the AMSC/BSTZ correlation comes out at 0.50, moderate. Little has changed lately, as the 1-year reading of 0.50 lands near the 3-year figure. The 5-year figure is 0.49, and annualized covariance runs at 936.1 %².
BSTZ is one of the assets that tracks AMSC most closely: it ranks #3 out of the 13 assets we track against AMSC. Their recent paths diverged sharply: over the last 12 months BSTZ outperformed by 100.1 percentage points (-42.7% for AMSC against +57.4% for BSTZ). Risk is not evenly split, since AMSC carries 3.3 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.
AMSC vs BSTZ: side by side
| AMSC (American Superconductor Corporation) | BSTZ (BlackRock Science and Technology Term Trust) | |
|---|---|---|
| 1-year return | -42.7% | +57.4% |
| 5-year return | +141.8% | +31.6% |
| Volatility (ann.) | 78.4% | 23.7% |
| Beta vs S&P 500 | 2.16 | 1.19 |
| Max drawdown (3Y) | -61.1% | -25.3% |
| Market cap | $1.4B | $2.1B |
| P/E (trailing) | 9.6 | 6.7 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | AMSC | BSTZ |
|---|---|---|
| 2022 | -66.2% | -55.3% |
| 2023 | +202.7% | +18.7% |
| 2024 | +121.1% | +37.5% |
| 2025 | +16.8% | +25.1% |
| 2026 | +3.7% | +44.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AMSC and BSTZ good diversifiers for each other?
To a limited degree. At 0.50 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 AMSC and BSTZ?
Using weekly returns as of 2026-08-27: 0.50 over 3 years, with 0.50 over the last year and 0.49 over 5 years.
Is BSTZ a good diversifier for AMSC?
To a limited degree. At 0.50 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 0.50 mean?
On the −1 to +1 scale, 0.50 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/amsc-vs-bstz.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/amsc-vs-bstz/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: AMSC correlations · BSTZ correlations
