OST vs SY: Correlation
How closely do Ostin Technology Group Co., Ltd. - Class A (OST) and So-Young International Inc. - American Depository Shares (SY) trade together? Their weekly returns over three years give a correlation of -0.31, which is negative.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are OST and SY?
Across a 3-year window, the weekly returns of OST and SY correlate at -0.31, negative, meaning they tend to move in opposite directions. The past 12 months show a tighter link (-0.01) than the 3-year average (-0.31). Stretching to 5 years gives -0.17, with an annualized covariance of -3617.2 %².
Out of 10 assets tracked against OST, SY lands near the bottom at #8. Correlation aside, the last 12 months split them widely, with OST ahead by 28.4 points (-12.6% versus -41.0%).
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.
OST vs SY: side by side
| OST (Ostin Technology Group Co., Ltd. - Class A) | SY (So-Young International Inc. - American Depository Shares) | |
|---|---|---|
| 1-year return | -12.6% | -41.0% |
| 5-year return | -100.0% | -54.5% |
| Volatility (ann.) | 115.4% | 99.6% |
| Beta vs S&P 500 | 0.39 | 1.08 |
| Max drawdown (3Y) | -99.4% | -77.5% |
| Market cap | – | $0.2B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | OST | SY |
|---|---|---|
| 2022 | – | -59.6% |
| 2023 | -17.4% | +0.0% |
| 2024 | -65.7% | -32.1% |
| 2025 | -97.5% | +219.0% |
| 2026 | +0.0% | -9.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are OST and SY good diversifiers for each other?
Yes. With a correlation of -0.31, OST and SY have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between OST and SY?
As of 2026-08-27, the correlation of weekly returns between OST and SY is -0.31 over 3 years, -0.01 over 1 year and -0.17 over 5 years.
Is SY a good diversifier for OST?
Yes. With a correlation of -0.31, OST and SY have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.31 mean?
A reading of -0.31 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/ost-vs-sy.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/ost-vs-sy/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: OST correlations · SY correlations
