ASTC vs BRTX: Correlation
Astrotech Corporation (ASTC) and BioRestorative Therapies, Inc. (BRTX) show a strong relationship: their 3-year correlation of weekly returns is 0.61.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ASTC and BRTX?
Over the past 3 years, ASTC and BRTX moved with a correlation of 0.61, which is strong. The link has tightened recently: the 1-year correlation (0.79) runs above the 3-year figure (0.61). Over 5 years the correlation is 0.54, and the annualized covariance of weekly returns is 91866.3 %².
Few assets follow ASTC as closely as BRTX, which ranks #2 of 47 tracked partners. The last year tells two different stories: ASTC led by 124.3 percentage points, +37.5% for ASTC against -86.8% for BRTX. One caveat on sizing: ASTC is 9.6 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.
ASTC vs BRTX: side by side
| ASTC (Astrotech Corporation) | BRTX (BioRestorative Therapies, Inc.) | |
|---|---|---|
| 1-year return | +37.5% | -86.8% |
| 5-year return | -78.4% | -98.4% |
| Volatility (ann.) | 1206.9% | 125.6% |
| Beta vs S&P 500 | 4.81 | 1.27 |
| Max drawdown (3Y) | -87.5% | -95.1% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | ASTC | BRTX |
|---|---|---|
| 2022 | -51.0% | -36.6% |
| 2023 | -15.0% | -36.7% |
| 2024 | -20.8% | -17.8% |
| 2025 | -48.5% | -17.8% |
| 2026 | +105.8% | -82.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ASTC and BRTX good diversifiers for each other?
To a limited degree. At 0.61 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 ASTC and BRTX?
The ASTC/BRTX correlation stands at 0.61 on a 3-year window (1 year: 0.79, 5 years: 0.54), computed from weekly returns as of 2026-08-27.
Is BRTX a good diversifier for ASTC?
To a limited degree. At 0.61 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 0.61 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/astc-vs-brtx.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/astc-vs-brtx/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: ASTC correlations · BRTX correlations
