AEHR vs. EWY
AEHR (Aehr Test Systems) is a stock, while EWY (iShares MSCI South Korea ETF) is Asia Pacific Equities fund tracking the MSCI Korea Index. Over the past 10 years, AEHR returned 60.03%/yr vs 17.46%/yr for EWY. At a 0.21 correlation, their price movements are largely independent.
Performance
AEHR vs. EWY - Performance Comparison
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Returns By Period
In the year-to-date period, AEHR achieves a 467.56% return, which is significantly higher than EWY's 119.05% return. Over the past 10 years, AEHR has outperformed EWY with an annualized return of 60.03%, while EWY has yielded a comparatively lower 17.46% annualized return.
AEHR
- 1D
- 1.41%
- 1M
- 33.85%
- YTD
- 467.56%
- 6M
- 362.80%
- 1Y
- 1,019.04%
- 3Y*
- 40.45%
- 5Y*
- 111.15%
- 10Y*
- 60.03%
EWY
- 1D
- -0.73%
- 1M
- 30.18%
- YTD
- 119.05%
- 6M
- 134.13%
- 1Y
- 251.82%
- 3Y*
- 51.99%
- 5Y*
- 20.31%
- 10Y*
- 17.46%
AEHR vs. EWY - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
AEHR Aehr Test Systems | 467.56% | 21.41% | -37.32% | 31.99% | -16.87% | 855.73% | 26.50% | 41.84% | -47.97% | 12.45% |
EWY iShares MSCI South Korea ETF | 119.05% | 95.33% | -20.48% | 19.05% | -26.59% | -7.58% | 39.43% | 7.97% | -20.37% | 44.97% |
Correlation
The correlation between AEHR and EWY is 0.48, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.48 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.39 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.38 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.30 |
Correlation (All Time) Calculated using the full available price history since May 15, 2000 | 0.21 |
Over the past year, AEHR and EWY have become more correlated (0.48) than their long-term average of 0.21, meaning their price movements have been converging.
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Return for Risk
AEHR vs. EWY — Risk / Return Rank
AEHR
EWY
AEHR vs. EWY - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Aehr Test Systems (AEHR) and iShares MSCI South Korea ETF (EWY). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
| AEHR | EWY | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +2.70 | ||
| Sortino ratioReturn per unit of downside risk | -0.46 | ||
| Omega ratioGain probability vs. loss probability | 1.57 | 1.74 | -0.18 |
| Calmar ratioReturn relative to maximum drawdown | 24.34 | 10.99 | +13.35 |
| Martin ratioReturn relative to average drawdown | 55.12 | 40.91 | +14.21 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| AEHR | EWY | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 8.73 | 6.02 | +2.70 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 1.02 | 0.71 | +0.31 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.63 | 0.64 | -0.01 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.08 | 0.33 | -0.25 |
Drawdowns
AEHR vs. EWY - Drawdown Comparison
The maximum AEHR drawdown since its inception was -97.98%, which is greater than EWY's maximum drawdown of -74.14%. Use the drawdown chart below to compare losses from any high point for AEHR and EWY.
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Drawdown Indicators
| AEHR | EWY | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -97.98% | -74.14% | -23.84% |
Max Drawdown (1Y)Largest decline over 1 year | -42.31% | -23.08% | -19.23% |
Max Drawdown (3Y)Largest decline over 3 years | -87.37% | -27.36% | -60.01% |
Max Drawdown (5Y)Largest decline over 5 years | -87.37% | -48.55% | -38.82% |
Max Drawdown (10Y)Largest decline over 10 years | -87.37% | -49.73% | -37.64% |
Current DrawdownCurrent decline from peak | 0.00% | -1.73% | +1.73% |
Average DrawdownAverage peak-to-trough decline | -79.66% | -20.13% | -59.53% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 18.65% | 6.19% | +12.46% |
Volatility
AEHR vs. EWY - Volatility Comparison
Aehr Test Systems (AEHR) has a higher volatility of 38.83% compared to iShares MSCI South Korea ETF (EWY) at 20.32%. This indicates that AEHR's price experiences larger fluctuations and is considered to be riskier than EWY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| AEHR | EWY | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 38.83% | 20.32% | +18.51% |
Volatility (6M)Calculated over the trailing 6-month period | 86.27% | 37.41% | +48.86% |
Volatility (1Y)Calculated over the trailing 1-year period | 118.12% | 42.10% | +76.02% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 109.54% | 28.83% | +80.71% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 94.96% | 27.37% | +67.59% |
Dividends
AEHR vs. EWY - Dividend Comparison
AEHR has not paid dividends to shareholders, while EWY's dividend yield for the trailing twelve months is around 0.96%.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
AEHR Aehr Test Systems | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
EWY iShares MSCI South Korea ETF | 0.96% | 2.10% | 2.55% | 2.52% | 1.23% | 2.16% | 0.73% | 2.10% | 1.34% | 2.90% | 1.21% | 2.42% |
Frequently Asked Questions
AEHR and EWY have a correlation of 0.48, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
AEHR has higher volatility (38.83%) compared to EWY (20.32%). In terms of maximum drawdown, AEHR dropped -97.98% vs EWY's -74.14%.
AEHR currently has the higher Sharpe Ratio (8.73 vs 6.02), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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