BSEM vs DSWL: Correlation
BioStem Technologies, Inc. (BSEM) and Deswell Industries, Inc. (DSWL) show a negative relationship: their 3-year correlation of weekly returns is -0.23.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BSEM and DSWL?
On 3 years of weekly data the BSEM/DSWL correlation comes out at -0.23, negative, meaning they tend to move in opposite directions. The past 12 months show a tighter link (-0.06) than the 3-year average (-0.23). The 5-year figure is -0.12, and annualized covariance runs at -783.9 %².
DSWL is close to the least connected end of BSEM's tracked universe, ranking #10 of 12. Their recent paths diverged sharply: over the last 12 months DSWL outperformed by 29.3 percentage points (-39.7% for BSEM against -10.4% for DSWL). Risk is not evenly split, since BSEM carries 3.7 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.
BSEM vs DSWL: side by side
| BSEM (BioStem Technologies, Inc.) | DSWL (Deswell Industries, Inc.) | |
|---|---|---|
| 1-year return | -39.7% | -10.4% |
| 5-year return | +263.2% | +0.8% |
| Volatility (ann.) | 113.1% | 30.4% |
| Beta vs S&P 500 | 1.65 | 0.34 |
| Max drawdown (3Y) | -88.0% | -29.5% |
| Market cap | $0.1B | – |
| P/E (trailing) | 4.1 | 4.6 |
| Dividend yield | 0.00% | 6.45% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | BSEM | DSWL |
|---|---|---|
| 2022 | +187.5% | -14.1% |
| 2023 | +96.0% | -8.3% |
| 2024 | +136.2% | -2.9% |
| 2025 | -72.5% | +54.7% |
| 2026 | +1.0% | -5.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BSEM and DSWL good diversifiers for each other?
Yes: at -0.23, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between BSEM and DSWL?
Using weekly returns as of 2026-08-27: -0.23 over 3 years, with -0.06 over the last year and -0.12 over 5 years.
Is DSWL a good diversifier for BSEM?
Yes: at -0.23, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.23 mean?
On the −1 to +1 scale, -0.23 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/bsem-vs-dswl.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/bsem-vs-dswl/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: BSEM correlations · DSWL correlations
