Rambus vs Silicon Labs
Silicon Labs reported revenue of $785 million in fiscal 2025, about the same as Rambus' $708 million in fiscal 2025. Rambus' revenue grew 27.1% in its latest year, and Silicon Labs' grew 34.3%. Rambus had an operating margin of 36.8%, against -9.0% at Silicon Labs. Free cash flow was $333 million at Rambus and $66 million at Silicon Labs. Their fiscal years end in different months (December 31 and January 3), so the periods don't line up exactly.
Side by side
| Rambus | Silicon Labs | |
|---|---|---|
| Latest fiscal year | FY2025, Dec 31, 2025 | FY2025, Jan 3, 2026 |
| Revenue | $708M | $785M |
| Revenue growth | 27.1% | 34.3% |
| Revenue growth a year, last 5 years | 23.5% | 9.0% |
| Gross margin | 79.6% | 58.2% |
| Operating margin | 36.8% | −9.0% |
| Net margin | 32.6% | −8.3% |
| Free cash flow | $333M | $66M |
| Free cash flow margin | 47.1% | 8.4% |
| Return on capital | 34.3% | −7.0% |
| Net debt to EBITDA | — | — |
| Dividends and buybacks | $7M | $0M |
| Change in diluted share count | 0.2% | 1.6% |
| Last close | $90.32 | $221.25 |
| P/E at the last close | 37.2× | — |
| Insider trades, last 12 months | sold $20.5 million | sold $4.2 million |
| Piotroski F-score | 5 of 9 | 5 of 9 |
Amounts in each company's own currency, US$ unless marked (a foreign company may report in another), each company's latest fiscal year from its 10-K, or 20-F or 40-F for a foreign company. Growth rates compare with the year before; the five-year rate is the average a year. Free cash flow is cash from operations minus capital spending; return on capital is after-tax operating income over the money invested in the business; P/E is the last close over the latest earnings per share. Banks are measured differently (return on equity, efficiency ratio), so some rows apply to one company only.
Ten years
Revenue
US$ billions, fiscal years
RambusSilicon Labs
Operating margin
Percent of revenue
RambusSilicon Labs
Free cash flow
US$ billions. Cash from operations minus capital expenditure.
RambusSilicon Labs
Source: the companies' Form 10-K filings, from SEC EDGAR, and the last close. For information only, not investment advice: the figures describe results, not which company is the better investment. The Filing Desk is not affiliated with either company. Full figures on the Rambus and Silicon Labs pages.