HSTM vs RGC: Correlation
How closely do HealthStream, Inc. (HSTM) and Regencell Bioscience Holdings Limited (RGC) trade together? Their weekly returns over three years give a correlation of -0.35, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are HSTM and RGC?
On 3 years of weekly data the HSTM/RGC correlation comes out at -0.35, negative, meaning they tend to move in opposite directions. The link has tightened recently: the 1-year correlation (-0.24) runs above the 3-year figure (-0.35). The 5-year figure is -0.25, and annualized covariance runs at -4214.9 %².
RGC is close to the least connected end of HSTM's tracked universe, ranking #12 of 13. The last year tells two different stories: HSTM led by 63.4 percentage points, +2.2% for HSTM against -61.2% for RGC. Risk is not evenly split, since RGC carries 16.1 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.
HSTM vs RGC: side by side
| HSTM (HealthStream, Inc.) | RGC (Regencell Bioscience Holdings Limited) | |
|---|---|---|
| 1-year return | +2.2% | -61.2% |
| 5-year return | -1.6% | +626.3% |
| Volatility (ann.) | 27.4% | 441.0% |
| Beta vs S&P 500 | 0.54 | -2.00 |
| Max drawdown (3Y) | -41.4% | -93.9% |
| Market cap | $0.8B | – |
| P/E (trailing) | 40.0 | – |
| Dividend yield | 0.46% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | HSTM | RGC |
|---|---|---|
| 2022 | -5.8% | -12.4% |
| 2023 | +9.3% | -62.4% |
| 2024 | +18.1% | -53.0% |
| 2025 | -27.1% | +16053.8% |
| 2026 | +25.5% | -73.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are HSTM and RGC good diversifiers for each other?
Yes: at -0.35, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between HSTM and RGC?
The HSTM/RGC correlation stands at -0.35 on a 3-year window (1 year: -0.24, 5 years: -0.25), computed from weekly returns as of 2026-08-27.
Is RGC a good diversifier for HSTM?
Yes: at -0.35, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.35 mean?
On the −1 to +1 scale, -0.35 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/hstm-vs-rgc.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/hstm-vs-rgc/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: HSTM correlations · RGC correlations
