AEHR vs DIOD: Correlation
How closely do Aehr Test Systems (AEHR) and Diodes Incorporated (DIOD) trade together? Their weekly returns over three years give a correlation of 0.47, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AEHR and DIOD?
On 3 years of weekly data the AEHR/DIOD correlation comes out at 0.47, moderate. The relationship has been stable: the 1-year correlation (0.57) sits close to the 3-year figure. The 5-year figure is 0.46, and annualized covariance runs at 2288.8 %².
DIOD is one of the assets that tracks AEHR most closely: it ranks #1 out of the 11 assets we track against AEHR. Their recent paths diverged sharply: over the last 12 months AEHR outperformed by 210.6 percentage points (+272.3% for AEHR against +61.7% for DIOD). Note the risk asymmetry: AEHR runs 1.9 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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 DIOD: side by side
| AEHR (Aehr Test Systems) | DIOD (Diodes Incorporated) | |
|---|---|---|
| 1-year return | +272.3% | +61.7% |
| 5-year return | +1209.1% | -7.4% |
| Volatility (ann.) | 97.6% | 50.3% |
| Beta vs S&P 500 | 2.33 | 1.84 |
| Max drawdown (3Y) | -87.2% | -60.1% |
| Market cap | $3.0B | $4.2B |
| P/E (trailing) | – | 48.6 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | AEHR | DIOD |
|---|---|---|
| 2022 | -16.9% | -30.7% |
| 2023 | +32.0% | +5.8% |
| 2024 | -37.3% | -23.4% |
| 2025 | +21.4% | -20.0% |
| 2026 | +348.0% | +84.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AEHR and DIOD good diversifiers for each other?
Reasonably. At 0.47, AEHR and DIOD keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between AEHR and DIOD?
Using weekly returns as of 2026-08-27: 0.47 over 3 years, with 0.57 over the last year and 0.46 over 5 years.
Is DIOD a good diversifier for AEHR?
Reasonably. At 0.47, AEHR and DIOD keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.47 mean?
A reading of 0.47 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
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Related comparisons
Hubs: AEHR correlations · DIOD correlations
