AEHR vs. RMBS
AEHR (Aehr Test Systems) and RMBS (Rambus Inc.) are both stocks. Both are in the Technology sector — AEHR in Semiconductor Equipment & Materials, RMBS in Semiconductors. Over the past 10 years, AEHR returned 46.40%/yr vs 22.22%/yr for RMBS. At a 0.20 correlation, their price movements are largely independent.
Performance
AEHR vs. RMBS - Performance Comparison
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Returns By Period
In the year-to-date period, AEHR achieves a 283.16% return, which is significantly higher than RMBS's 9.75% return. Over the past 10 years, AEHR has outperformed RMBS with an annualized return of 46.40%, while RMBS has yielded a comparatively lower 22.22% annualized return.
AEHR
- 1D
- -4.55%
- 1M
- -32.91%
- 6M
- 168.52%
- YTD
- 283.16%
- 1Y
- 413.34%
- 3Y*
- 16.97%
- 5Y*
- 57.31%
- 10Y*
- 46.40%
- ALL TIME*
- 5.90%
RMBS
- 1D
- -0.58%
- 1M
- -28.56%
- 6M
- -6.61%
- YTD
- 9.75%
- 1Y
- 47.85%
- 3Y*
- 18.55%
- 5Y*
- 34.34%
- 10Y*
- 22.22%
- ALL TIME*
- 10.15%
AEHR vs. RMBS - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
AEHR Aehr Test Systems | 283.16% | 21.41% | -37.32% | 31.99% | -16.87% | 855.73% | 26.50% | 41.84% | -47.97% | 12.45% |
RMBS Rambus Inc. | 9.75% | 73.84% | -22.55% | 90.54% | 21.88% | 68.33% | 26.75% | 79.60% | -46.06% | 3.27% |
Correlation
The correlation between AEHR and RMBS is 0.53, 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 | 0.53 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.50 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.50 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.40 |
Correlation (All Time) Calculated using the full available price history since Aug 15, 1997 | 0.20 |
Over the past year, AEHR and RMBS have become more correlated (0.53) than their long-term average of 0.20, meaning their price movements have been converging.
Fundamentals
AEHR:
$2.43B
RMBS:
$10.91B
AEHR:
-$0.23
RMBS:
$2.10
AEHR:
47.90
RMBS:
15.31
AEHR:
11.69
RMBS:
7.94
AEHR:
$50.00M
RMBS:
$721.16M
AEHR:
$17.65M
RMBS:
$555.52M
AEHR:
-$10.85M
RMBS:
$298.07M
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Return for Risk
AEHR vs. RMBS — Risk / Return Rank
AEHR
RMBS
AEHR vs. RMBS - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Aehr Test Systems (AEHR) and Rambus Inc. (RMBS). 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.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| AEHR | RMBS | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +2.78 | ||
| Sortino ratioReturn per unit of downside risk | +2.08 | ||
| Omega ratioGain probability vs. loss probability | 1.39 | 1.17 | +0.22 |
| Calmar ratioReturn relative to maximum drawdown | 9.79 | 1.18 | +8.61 |
| Martin ratioReturn relative to average drawdown | 20.21 | 2.73 | +17.48 |
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Drawdowns
AEHR vs. RMBS - Drawdown Comparison
The maximum AEHR drawdown since its inception was -97.98%, roughly equal to the maximum RMBS drawdown of -97.16%. Use the drawdown chart below to compare losses from any high point for AEHR and RMBS.
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Drawdown Indicators
| AEHR | RMBS | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -97.98% | -97.16% | -0.82% |
Max Drawdown (1Y)Largest decline over 1 year | -42.58% | -40.91% | -1.67% |
Max Drawdown (3Y)Largest decline over 3 years | -87.37% | -48.83% | -38.54% |
Max Drawdown (5Y)Largest decline over 5 years | -87.37% | -48.83% | -38.54% |
Max Drawdown (10Y)Largest decline over 10 years | -87.37% | -52.95% | -34.42% |
Current DrawdownCurrent decline from peak | -33.64% | -40.91% | +7.27% |
Average DrawdownAverage peak-to-trough decline | -79.41% | -74.74% | -4.67% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 20.57% | 17.56% | +3.01% |
Volatility
AEHR vs. RMBS - Volatility Comparison
Aehr Test Systems (AEHR) has a higher volatility of 38.99% compared to Rambus Inc. (RMBS) at 24.72%. This indicates that AEHR's price experiences larger fluctuations and is considered to be riskier than RMBS based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| AEHR | RMBS | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 38.99% | 24.72% | +14.27% |
Volatility (6M)Calculated over the trailing 6-month period | 94.48% | 64.94% | +29.54% |
Volatility (1Y)Calculated over the trailing 1-year period | 123.49% | 79.98% | +43.51% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 103.40% | 56.46% | +46.94% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 94.64% | 46.94% | +47.70% |
Dividends
AEHR vs. RMBS - Dividend Comparison
Neither AEHR nor RMBS has paid dividends to shareholders.
Financials
AEHR vs. RMBS - Financials Comparison
This section allows you to compare key financial metrics between Aehr Test Systems and Rambus Inc.. You can select fields from income statements, balance sheets, and cash flow statements to easily visualize and compare the financial health of both companies.
Total Revenue: Total amount of money received from sales and other business activities
AEHR vs. RMBS - Profitability Comparison
AEHR - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jul 2026, Aehr Test Systems reported a gross profit of 8.02M and revenue of 18.84M. Therefore, the gross margin over that period was 42.6%.
RMBS - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jul 2026, Rambus Inc. reported a gross profit of 143.66M and revenue of 180.19M. Therefore, the gross margin over that period was 79.7%.
AEHR - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jul 2026, Aehr Test Systems reported an operating income of -987.00K and revenue of 18.84M, resulting in an operating margin of -5.2%.
RMBS - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jul 2026, Rambus Inc. reported an operating income of 61.76M and revenue of 180.19M, resulting in an operating margin of 34.3%.
AEHR - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jul 2026, Aehr Test Systems reported a net income of 1.39M and revenue of 18.84M, resulting in a net margin of 7.4%.
RMBS - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jul 2026, Rambus Inc. reported a net income of 59.86M and revenue of 180.19M, resulting in a net margin of 33.2%.
Frequently Asked Questions
AEHR and RMBS have a correlation of 0.53, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
AEHR has higher volatility (38.99%) compared to RMBS (24.72%). In terms of maximum drawdown, AEHR dropped -97.98% vs RMBS's -97.16%.
AEHR currently has the higher Sharpe Ratio (3.38 vs 0.60), 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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