AEHR vs. KORU

Last updated Jun 4, 2026

AEHR (Aehr Test Systems) is a stock, while KORU (Direxion Daily South Korea Bull 3X Shares) is Leveraged Equities fund tracking the MSCI Korea 25-50 Index. Over the past 10 years, AEHR returned 60.03%/yr vs 19.62%/yr for KORU. At a 0.25 correlation, their price movements are largely independent.

Performance

AEHR vs. KORU - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Aehr Test Systems (AEHR) and Direxion Daily South Korea Bull 3X Shares (KORU). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AEHR achieves a 467.56% return, which is significantly lower than KORU's 559.14% return. Over the past 10 years, AEHR has outperformed KORU with an annualized return of 60.03%, while KORU has yielded a comparatively lower 19.62% 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%

KORU

• 1D: -2.29%
• 1M: 92.47%
• YTD: 559.14%
• 6M: 689.29%
• 1Y: 2,160.10%
• 3Y*: 132.56%
• 5Y*: 23.42%
• 10Y*: 19.62%

*Multi-year figures are annualized to reflect compound growth (CAGR)

AEHR vs. KORU - 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%
KORU Direxion Daily South Korea Bull 3X Shares	559.14%	432.73%	-62.18%	28.61%	-70.16%	-33.86%	48.78%	5.47%	-59.89%	167.08%

Correlation

The correlation between AEHR and KORU 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	0.40
Correlation (5Y) Calculated over the trailing 5-year period	0.39
Correlation (10Y) Calculated over the trailing 10-year period	0.29
Correlation (All Time) Calculated using the full available price history since Apr 11, 2013	0.25

Over the past year, AEHR and KORU have become more correlated (0.48) than their long-term average of 0.25, meaning their price movements have been converging.

Return for Risk

AEHR vs. KORU — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

AEHR

AEHR Risk / Return Rank: 98
AEHR Sharpe Ratio Rank: 100
AEHR Sortino Ratio Rank: 97
AEHR Omega Ratio Rank: 94
AEHR Calmar Ratio Rank: 99
AEHR Martin Ratio Rank: 99

KORU

KORU Risk / Return Rank: 97
KORU Sharpe Ratio Rank: 100
KORU Sortino Ratio Rank: 95
KORU Omega Ratio Rank: 95
KORU Calmar Ratio Rank: 99
KORU Martin Ratio Rank: 99

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

AEHR vs. KORU - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Aehr Test Systems (AEHR) and Direxion Daily South Korea Bull 3X Shares (KORU). 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	KORU	Difference
Sharpe ratio: Return per unit of total volatility	8.73	17.63	-8.90
Sortino ratio: Return per unit of downside risk	4.86	5.20	-0.35
Omega ratio: Gain probability vs. loss probability	1.57	1.72	-0.16
Calmar ratio: Return relative to maximum drawdown	24.34	35.65	-11.31
Martin ratio: Return relative to average drawdown	55.12	112.99	-57.87
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AEHR vs. KORU - Sharpe Ratio Comparison

The current AEHR Sharpe Ratio is 8.73, which is lower than the KORU Sharpe Ratio of 17.63. The chart below compares the historical Sharpe Ratios of AEHR and KORU, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	AEHR	KORU	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	8.73	17.63	-8.90
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	1.02	0.28	+0.75
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.63	0.25	+0.39
Sharpe Ratio (All Time) Calculated using the full available price history	0.08	0.13	-0.04

Drawdowns

AEHR vs. KORU - Drawdown Comparison

The maximum AEHR drawdown since its inception was -97.98%, roughly equal to the maximum KORU drawdown of -95.79%. Use the drawdown chart below to compare losses from any high point for AEHR and KORU.

Drawdown Indicators

	AEHR	KORU	Difference
Max Drawdown Largest peak-to-trough decline	-97.98%	-95.79%	-2.19%
Max Drawdown (1Y) Largest decline over 1 year	-42.31%	-61.39%	+19.08%
Max Drawdown (3Y) Largest decline over 3 years	-87.37%	-73.71%	-13.66%
Max Drawdown (5Y) Largest decline over 5 years	-87.37%	-93.35%	+5.98%
Max Drawdown (10Y) Largest decline over 10 years	-87.37%	-95.79%	+8.42%
Current Drawdown Current decline from peak	0.00%	-5.39%	+5.39%
Average Drawdown Average peak-to-trough decline	-79.66%	-57.53%	-22.13%
Ulcer Index Depth and duration of drawdowns from previous peaks	18.65%	19.33%	-0.68%

Volatility

AEHR vs. KORU - Volatility Comparison

The current volatility for Aehr Test Systems (AEHR) is 38.83%, while Direxion Daily South Korea Bull 3X Shares (KORU) has a volatility of 60.18%. This indicates that AEHR experiences smaller price fluctuations and is considered to be less risky than KORU based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AEHR	KORU	Difference
Volatility (1M) Calculated over the trailing 1-month period	38.83%	60.18%	-21.35%
Volatility (6M) Calculated over the trailing 6-month period	86.27%	110.71%	-24.44%
Volatility (1Y) Calculated over the trailing 1-year period	118.12%	124.15%	-6.03%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	109.54%	85.11%	+24.43%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	94.96%	79.91%	+15.05%

Dividends

AEHR vs. KORU - Dividend Comparison

AEHR has not paid dividends to shareholders, while KORU's dividend yield for the trailing twelve months is around 0.14%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
AEHR Aehr Test Systems	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
KORU Direxion Daily South Korea Bull 3X Shares	0.14%	0.89%	4.10%	2.55%	0.48%	0.76%	0.01%	0.93%	1.40%	3.59%

Frequently Asked Questions

Can I hold both AEHR and KORU in my portfolio?

AEHR and KORU 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.

Which is riskier, AEHR or KORU?

KORU has higher volatility (60.18%) compared to AEHR (38.83%). In terms of maximum drawdown, AEHR dropped -97.98% vs KORU's -95.79%.

Which has better risk-adjusted returns?

KORU currently has the higher Sharpe Ratio (17.63 vs 8.73), 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.