HDSN vs SJ: Correlation
How closely do Hudson Technologies, Inc. (HDSN) and Scienjoy Holding Corporation - Class A (SJ) trade together? Their weekly returns over three years give a correlation of -0.27, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are HDSN and SJ?
Over the past 3 years, HDSN and SJ moved with a correlation of -0.27, which is negative, meaning they tend to move in opposite directions. The past 12 months show a tighter link (-0.01) than the 3-year average (-0.27). Over 5 years the correlation is -0.09, and the annualized covariance of weekly returns is -953.9 %².
Out of 12 assets tracked against HDSN, SJ lands near the bottom at #11. Their recent paths diverged sharply: over the last 12 months SJ outperformed by 80.9 percentage points (-46.5% for HDSN against +34.4% for SJ). Risk is not evenly split, since SJ carries 2.1 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.
HDSN vs SJ: side by side
| HDSN (Hudson Technologies, Inc.) | SJ (Scienjoy Holding Corporation - Class A) | |
|---|---|---|
| 1-year return | -46.5% | +34.4% |
| 5-year return | +68.6% | -79.3% |
| Volatility (ann.) | 41.6% | 85.6% |
| Beta vs S&P 500 | 0.74 | -0.26 |
| Max drawdown (3Y) | -67.6% | -87.8% |
| Market cap | $0.2B | – |
| P/E (trailing) | 24.9 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | HDSN | SJ |
|---|---|---|
| 2022 | +127.9% | -65.3% |
| 2023 | +33.3% | +76.6% |
| 2024 | -58.6% | -70.1% |
| 2025 | +22.8% | -33.2% |
| 2026 | -20.0% | +41.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are HDSN and SJ good diversifiers for each other?
Yes. With a correlation of -0.27, HDSN and SJ have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between HDSN and SJ?
The HDSN/SJ correlation stands at -0.27 on a 3-year window (1 year: -0.01, 5 years: -0.09), computed from weekly returns as of 2026-08-27.
Is SJ a good diversifier for HDSN?
Yes. With a correlation of -0.27, HDSN and SJ have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.27 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/hdsn-vs-sj.json
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Related comparisons
Hubs: HDSN correlations · SJ correlations
