Rambus vs Silicon Labs
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The short version
- Silicon Labs is the larger business, with $785M of revenue in fiscal 2025 against $708M for Rambus.
- Silicon Labs grew revenue faster (34.3%, against 27.1%).
- Rambus kept more of each dollar of sales as operating profit (36.8% operating margin, against −9.0%).
- Rambus turned more of its sales into free cash flow (47.1% FCF margin, against 8.4%).
- Rambus earned a higher return on the capital invested in it (34.3%, against −7.0%).
| Latest fiscal year | RMBS · FY25 | SLAB · FY25 |
|---|---|---|
| Size | ||
| Market cap | $9.4B | $7.3B |
| Revenue | $708M | $785M |
| Free cash flow | $333M | $65.8M |
| Net income | $231M | −$64.9M |
| Growth | ||
| Revenue growth | 27.1% | 34.3% |
| 5-year growth | 23.5% | 9.0% |
| Share count change | 0.2% | 1.7% |
| Profitability | ||
| Gross margin | 79.6% | 58.2% |
| Operating margin | 36.8% | −9.0% |
| Net margin | 32.6% | −8.3% |
| FCF margin | 47.1% | 8.4% |
| Return on capital | 34.3% | −7.0% |
| Return on equity | 18.6% | −6.0% |
| Balance sheet | ||
| Net debt | −$762M | −$291M |
| Net debt / EBITDA | — | — |
| Dividends and buybacks | $7.1M | $0.0M |
| Valuation & quality | ||
| P/E | 40.8x | — |
| Piotroski F-score | 5 | 5 |
Revenue
FY16
RMBS $337M
SLAB $698M
FY17
RMBS $393M
SLAB $769M
FY18
RMBS $231M
SLAB $868M
FY19
RMBS $228M
SLAB $474M
FY20
RMBS $246M
SLAB $511M
FY21
RMBS $328M
SLAB $721M
FY22
RMBS $455M
SLAB $1.0B
FY23
RMBS $461M
SLAB $782M
FY24
RMBS $557M
SLAB $584M
FY25
RMBS $708M
SLAB $785M
RMBS
SLAB
Operating margin
FY16
RMBS 10.0%
SLAB 9.5%
FY17
RMBS 13.8%
SLAB 11.1%
FY18
RMBS −37.6%
SLAB 9.8%
FY19
RMBS −44.0%
SLAB −18.7%
FY20
RMBS −17.9%
SLAB −21.0%
FY21
RMBS 7.4%
SLAB −4.6%
FY22
RMBS 16.9%
SLAB 11.7%
FY23
RMBS 33.3%
SLAB −3.1%
FY24
RMBS 32.9%
SLAB −28.3%
FY25
RMBS 36.8%
SLAB −9.0%
RMBS
SLAB
Free cash flow
FY16
RMBS $87.1M
SLAB $118M
FY17
RMBS $108M
SLAB $177M
FY18
RMBS $75.5M
SLAB $149M
FY19
RMBS $122M
SLAB $151M
FY20
RMBS $156M
SLAB $118M
FY21
RMBS $195M
SLAB $62.6M
FY22
RMBS $213M
SLAB $115M
FY23
RMBS $173M
SLAB −$52.6M
FY24
RMBS $200M
SLAB −$25.7M
FY25
RMBS $333M
SLAB $65.8M
RMBS
SLAB
Return on capital
FY16
RMBS 3.2%
SLAB 10.5%
FY17
RMBS 5.3%
SLAB 9.2%
FY18
RMBS −9.0%
SLAB 12.7%
FY19
RMBS −7.7%
SLAB −9.0%
FY20
RMBS −4.4%
SLAB −9.4%
FY21
RMBS 4.1%
SLAB −3.1%
FY22
RMBS 14.4%
SLAB 12.3%
FY23
RMBS 28.5%
SLAB −2.4%
FY24
RMBS 26.3%
SLAB −15.9%
FY25
RMBS 34.3%
SLAB −7.0%
RMBS
SLAB
Each company's latest fiscal year; fiscal years end in different months. The best value in each row is highlighted where higher (or lower) is clearly better. Not investment advice.