AEHR vs COHU: Correlation
How closely do Aehr Test Systems (AEHR) and Cohu, Inc. (COHU) trade together? Their weekly returns over three years give a correlation of 0.46, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AEHR and COHU?
Over the past 3 years, AEHR and COHU moved with a correlation of 0.46, which is moderate. The link has tightened recently: the 1-year correlation (0.60) runs above the 3-year figure (0.46). Over 5 years the correlation is 0.46, and the annualized covariance of weekly returns is 2007.5 %².
COHU is one of the assets that tracks AEHR most closely: it ranks #2 out of the 11 assets we track against AEHR. Correlation aside, the last 12 months split them widely, with AEHR ahead by 117.5 points (+272.3% versus +154.8%). One caveat on sizing: AEHR is 2.2 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.
AEHR vs COHU: side by side
| AEHR (Aehr Test Systems) | COHU (Cohu, Inc.) | |
|---|---|---|
| 1-year return | +272.3% | +154.8% |
| 5-year return | +1209.1% | +41.3% |
| Volatility (ann.) | 97.6% | 44.8% |
| Beta vs S&P 500 | 2.33 | 1.74 |
| Max drawdown (3Y) | -87.2% | -64.7% |
| Market cap | $3.0B | $2.4B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | AEHR | COHU |
|---|---|---|
| 2022 | -16.9% | -15.9% |
| 2023 | +32.0% | +10.4% |
| 2024 | -37.3% | -24.6% |
| 2025 | +21.4% | -12.8% |
| 2026 | +348.0% | +122.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AEHR and COHU good diversifiers for each other?
Reasonably. At 0.46, AEHR and COHU keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between AEHR and COHU?
Using weekly returns as of 2026-08-27: 0.46 over 3 years, with 0.60 over the last year and 0.46 over 5 years.
Is COHU a good diversifier for AEHR?
Reasonably. At 0.46, AEHR and COHU keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.46 mean?
On the −1 to +1 scale, 0.46 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
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Related comparisons
Hubs: AEHR correlations · COHU correlations
