Rambus (RMBS) vs Silicon Motion Technology (SIMO)
Head-to-head comparison of performance, valuation, growth, profitability and dividends. Prices delayed 15 minutes; data as of Oct 8, 2026.
Summary
Silicon Motion Technology (SIMO) has outperformed Rambus (RMBS) over the past year, gaining 202.6% versus a gain of 15.1%. Over five years, RMBS leads with a +402.2% price change compared with +322.4% for SIMO. Rambus is the larger company by market cap ($12.09 billion vs $9.69 billion), about 1.2 times the size.
On valuation, Silicon Motion Technology trades at a lower forward P/E (18.0x vs 30.0x for Rambus). Silicon Motion Technology pays a dividend yielding 0.70%, while Rambus does not currently pay one. Rambus converts more of its revenue into profit, with a net margin of 32.6% versus 13.8%.
Summary generated from market data by MetaCap's automated system. Methodology
Relative performance
Percent change in share price from the first common trading day shown; excludes dividends.
Head-to-head
| Metric | RMBS | SIMO |
|---|---|---|
| Share price | $111.48 | $285.78 |
| Market cap | $12.09B | $9.69B |
| 1-day change | -2.29% | +0.29% |
| YTD return | +21.32% | +208.28% |
| 1-year return | +15.12% | +202.57% |
| 5-year return | +402.16% | +322.38% |
| P/E ratio (TTM) | 52.34 | 33.42 |
| Forward P/E | 29.96 | 18.00 |
| EPS (TTM) | $2.13 | $8.55 |
| Dividend yield | 0.00% | 0.70% |
| Annual dividend | $0.00 | $2.00 |
| Revenue (latest FY) | $707.63M | $885.63M |
| Revenue growth (YoY) | +27.13% | +10.21% |
| Net income (latest FY) | $230.46M | $122.64M |
| Gross margin | 79.59% | 48.27% |
| Operating margin | 36.77% | 10.51% |
| Net margin | 32.57% | 13.85% |
| 52-week high | $174.10 | $355.00 |
| 52-week low | $77.89 | $79.76 |
| Distance from 52-week high | -35.97% | -19.50% |
| Analyst consensus | strong_buy | strong_buy |
| Avg. price target upside | +26.99% | +29.37% |
| Average volume | 2.45M | 942.79K |
| Shares outstanding | 108.46M | 33.91M |
| Employees | 791 | 2,009 |
| Sector | Technology | Technology |
| Industry | Semiconductors | Semiconductors |
Highlighted cells mark the higher value for growth, returns, margins and yield, and the lower value for P/E ratios. Highlighting is a mechanical comparison, not a recommendation.
Key differences
- SIMO has outperformed RMBS by 187.5 percentage points over the past year.
- Rambus trades at a higher earnings multiple (52.3x vs 33.4x trailing P/E).
- Rambus is more profitable, keeping 32.6 cents of every revenue dollar as net income versus 13.8 cents for Silicon Motion Technology.
- Rambus grew revenue faster in its latest fiscal year (+27.13% vs +10.21%).
About Rambus
RMBS stock →Rambus Inc. manufactures and sells semiconductor products in the United States, South Korea, Singapore, and internationally.
Technology · Semiconductors · 791 employees
About Silicon Motion Technology
SIMO stock →Silicon Motion Technology Corporation, together with its subsidiaries, designs, develops, and markets NAND flash controllers for solid-state storage devices and related devices in China, Japan, Singapore, Taiwan, Korea, the United States, and internationally. It offers controllers for computing-grade solid state drives (SSDs), which are used in PCs and other client devices; enterprise-grade SSDs used in enterprise and hyperscale data centers; eMMC and UFS mobile embedded storage for use in smartphones and IoT devices; flash memory cards and flash drives for use in expandable storage; and specialized SSDs that are used in industrial, commercial, and automotive applications.
Technology · Semiconductors · 2,009 employees
RMBS vs SIMO FAQ
Which is bigger, Rambus or Silicon Motion Technology?
Rambus (RMBS) is larger, with a market capitalization of $12.09B compared with $9.69B for Silicon Motion Technology (SIMO).
Which stock has performed better over the past year, RMBS or SIMO?
SIMO returned +202.57% over the past 12 months, compared with +15.12% for RMBS (price return, excluding dividends). Past performance does not predict future results.
Which has the lower P/E ratio, RMBS or SIMO?
SIMO has the lower trailing P/E at 33.4, versus 52.3 for RMBS. A lower P/E is not by itself a sign of a better investment; it can reflect slower expected growth or higher risk.
Which pays a higher dividend, Rambus or Silicon Motion Technology?
Silicon Motion Technology pays a dividend yielding 0.70%, while Rambus does not currently pay a regular dividend.
Are Rambus and Silicon Motion Technology in the same industry?
Yes. Both are classified in the Semiconductors industry within the Technology sector.