COHU vs. AEHR

Last updated Jun 4, 2026

COHU (Cohu, Inc.) and AEHR (Aehr Test Systems) are both stocks. Both operate in the Semiconductor Equipment & Materials industry within the Technology sector. Over the past 10 years, COHU returned 17.23%/yr vs 60.03%/yr for AEHR. At a 0.21 correlation, their price movements are largely independent.

Performance

COHU vs. AEHR - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Cohu, Inc. (COHU) and Aehr Test Systems (AEHR). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, COHU achieves a 141.17% return, which is significantly lower than AEHR's 467.56% return. Over the past 10 years, COHU has underperformed AEHR with an annualized return of 17.23%, while AEHR has yielded a comparatively higher 60.03% annualized return.

COHU

• 1D: -2.55%
• 1M: 20.20%
• YTD: 141.17%
• 6M: 123.67%
• 1Y: 210.74%
• 3Y*: 13.39%
• 5Y*: 8.64%
• 10Y*: 17.23%

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%

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

COHU vs. AEHR - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
COHU Cohu, Inc.	141.17%	-12.85%	-24.55%	10.42%	-15.86%	-0.24%	67.55%	44.29%	-25.96%	59.95%
AEHR Aehr Test Systems	467.56%	21.41%	-37.32%	31.99%	-16.87%	855.73%	26.50%	41.84%	-47.97%	12.45%

Correlation

The correlation between COHU and AEHR is 0.62, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.62
Correlation (3Y) Calculated over the trailing 3-year period	0.58
Correlation (5Y) Calculated over the trailing 5-year period	0.58
Correlation (10Y) Calculated over the trailing 10-year period	0.41
Correlation (All Time) Calculated using the full available price history since Aug 18, 1997	0.21

Over the past year, COHU and AEHR have become more correlated (0.62) than their long-term average of 0.21, meaning their price movements have been converging.

Fundamentals

Market Cap COHU : $2.64B AEHR : $3.52B
EPS COHU : -$1.19 AEHR : -$0.38
PS Ratio COHU : 5.46 AEHR : 76.53
PB Ratio COHU : 3.29 AEHR : 25.34
Total Revenue (TTM) COHU : $481.28M AEHR : $45.26M
Gross Profit (TTM) COHU : $143.88M AEHR : $13.90M
EBITDA (TTM) COHU : -$10.69M AEHR : -$13.56M

Return for Risk

COHU vs. AEHR — Risk / Return Rank

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

COHU

COHU Risk / Return Rank: 96
COHU Sharpe Ratio Rank: 98
COHU Sortino Ratio Rank: 95
COHU Omega Ratio Rank: 92
COHU Calmar Ratio Rank: 97
COHU Martin Ratio Rank: 98

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

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.

COHU vs. AEHR - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Cohu, Inc. (COHU) and Aehr Test Systems (AEHR). 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.

	COHU	AEHR	Difference
Sharpe ratio Return per unit of total volatility	4.23	8.73	-4.50
Sortino ratio Return per unit of downside risk	4.10	4.86	-0.75
Omega ratio Gain probability vs. loss probability	1.50	1.57	-0.07
Calmar ratio Return relative to maximum drawdown	10.48	24.34	-13.86
Martin ratio Return relative to average drawdown	29.55	55.12	-25.58
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

COHU vs. AEHR - Sharpe Ratio Comparison

The current COHU Sharpe Ratio is 4.23, which is lower than the AEHR Sharpe Ratio of 8.73. The chart below compares the historical Sharpe Ratios of COHU and AEHR, 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

	COHU	AEHR	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	4.23	8.73	-4.50
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.19	1.02	-0.83
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.35	0.63	-0.29
Sharpe Ratio (All Time) Calculated using the full available price history	0.25	0.08	+0.16

Drawdowns

COHU vs. AEHR - Drawdown Comparison

The maximum COHU drawdown since its inception was -86.67%, smaller than the maximum AEHR drawdown of -97.98%. Use the drawdown chart below to compare losses from any high point for COHU and AEHR.

Drawdown Indicators

	COHU	AEHR	Difference
Max Drawdown Largest peak-to-trough decline	-86.67%	-97.98%	+11.31%
Max Drawdown (1Y) Largest decline over 1 year	-20.24%	-42.31%	+22.07%
Max Drawdown (3Y) Largest decline over 3 years	-69.46%	-87.37%	+17.91%
Max Drawdown (5Y) Largest decline over 5 years	-69.46%	-87.37%	+17.91%
Max Drawdown (10Y) Largest decline over 10 years	-73.63%	-87.37%	+13.74%
Current Drawdown Current decline from peak	-2.55%	0.00%	-2.55%
Average Drawdown Average peak-to-trough decline	-48.07%	-79.66%	+31.59%
Ulcer Index Depth and duration of drawdowns from previous peaks	7.17%	18.65%	-11.48%

Volatility

COHU vs. AEHR - Volatility Comparison

The current volatility for Cohu, Inc. (COHU) is 19.54%, while Aehr Test Systems (AEHR) has a volatility of 38.83%. This indicates that COHU experiences smaller price fluctuations and is considered to be less risky than AEHR based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	COHU	AEHR	Difference
Volatility (1M) Calculated over the trailing 1-month period	19.54%	38.83%	-19.29%
Volatility (6M) Calculated over the trailing 6-month period	36.35%	86.27%	-49.92%
Volatility (1Y) Calculated over the trailing 1-year period	50.33%	118.12%	-67.79%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	45.95%	109.54%	-63.59%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	50.09%	94.96%	-44.87%

Dividends

COHU vs. AEHR - Dividend Comparison

Neither COHU nor AEHR has paid dividends to shareholders.

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%
COHU Cohu, Inc.	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.16%	1.05%	1.49%	1.09%	1.73%	1.99%

Financials

COHU vs. AEHR - Profitability Comparison

The chart below illustrates the profitability comparison between Cohu, Inc. and Aehr Test Systems over time, highlighting three key metrics: Gross Profit Margin, Operating Margin, and Net Profit Margin.

COHU - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Cohu, Inc. reported a gross profit of 0.00 and revenue of 125.12M. Therefore, the gross margin over that period was 0.0%.

AEHR - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Aehr Test Systems reported a gross profit of 3.37M and revenue of 10.31M. Therefore, the gross margin over that period was 32.7%.

COHU - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Cohu, Inc. reported an operating income of -11.15M and revenue of 125.12M, resulting in an operating margin of -8.9%.

AEHR - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Aehr Test Systems reported an operating income of -4.23M and revenue of 10.31M, resulting in an operating margin of -41.0%.

COHU - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Cohu, Inc. reported a net income of -12.07M and revenue of 125.12M, resulting in a net margin of -9.7%.

AEHR - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Aehr Test Systems reported a net income of -3.20M and revenue of 10.31M, resulting in a net margin of -31.1%.

Frequently Asked Questions

Can I hold both COHU and AEHR in my portfolio?

COHU and AEHR have a correlation of 0.62, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, COHU or AEHR?

AEHR has higher volatility (38.83%) compared to COHU (19.54%). In terms of maximum drawdown, COHU dropped -86.67% vs AEHR's -97.98%.

Which has better risk-adjusted returns?

AEHR currently has the higher Sharpe Ratio (8.73 vs 4.23), 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.