Built In’s roundup names 10 semiconductor and adjacent technology companies, but it is not a verified ranking of Silicon Valley-headquartered firms. Its list ranges from chip design and semiconductor IP to manufacturing equipment, RFID and solar technology—and includes Arm, which Built In locates in Cambridgeshire, England.
Here is what the full list covers, how the companies differ, and what readers should keep in mind about its geography and the word “top.”
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What the Built In list includes
Built In’s article, updated September 11, 2026, contains 10 company entries. Its short list preview shows only seven names, so the full article body is the relevant source for the complete lineup. Built In supplies the locations and company descriptions below; they are not an independent technical audit.
| Company | Location stated by Built In | Role described in the roundup |
|---|---|---|
| Arm | Cambridgeshire, England | Compute platforms and semiconductor products for data centers, autonomous machines, smartphones, PCs, wearables and AI computing. |
| GCT Semiconductor | San Jose | System-on-chip products combining radio-frequency, baseband modem and digital signal processing functions for wireless connectivity. |
| Rambus | Sunnyvale | Semiconductor intellectual property related to speed, security and memory. |
| SiTime | Santa Clara | MEMS-based timing solutions, including oscillators and resonators. |
| Solaria Corporation | Fremont | Solar-panel technology, an adjacent area rather than a conventional semiconductor category in this roundup. |
| Intel Corp | Santa Clara | Computer hardware, including processors, chipsets, memory, storage and power solutions. |
| Crocus Technology | Santa Clara | Magnetic sensors and embedded memory. |
| SiFive | San Mateo | Customizable CPU and semiconductor IP design products. |
| Applied Materials | Santa Clara | Materials engineering and equipment used in semiconductor and display production. |
| Alien Technology | San Jose | RFID devices and related readers, antennas, tags and labels. |
Built In’s full roundup is the source for these descriptions and stated locations.
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How the companies span the technology landscape
The list is broader than a directory of chip designers. It includes companies associated with compute platforms, chip IP, connectivity, timing, sensors, memory and production equipment. It also includes RFID products and solar-panel technology, which sit alongside—not wholly within—the central semiconductor manufacturing and design chain.
- Compute and design: Arm, Intel and SiFive are described in connection with processors, computing platforms or customizable CPU designs.
- IP and supporting components: Rambus, GCT Semiconductor and SiTime represent semiconductor IP, wireless system-on-chip functions and timing components.
- Sensors and identification: Crocus Technology is associated with magnetic sensors and embedded memory; Alien Technology with RFID hardware and related components.
- Manufacturing tools and adjacent technology: Applied Materials supplies production equipment and materials engineering, while Solaria is included for solar-panel technology.
For readers exploring employers, this breadth matters: a role at an equipment supplier, an IP business or an RFID company can be part of the wider semiconductor ecosystem without involving the same work as designing a processor.
Why “in Silicon Valley” needs a qualification
The roundup does not define Silicon Valley or state a consistent inclusion rule, such as requiring headquarters, a local office or substantial regional operations. Most listed locations are Bay Area cities, but Built In gives Arm’s location as Cambridgeshire, England. The title therefore should not be read as evidence that all 10 companies are headquartered in Silicon Valley.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does “top” mean ranked?
No ranking method is provided in the Built In article. It does not give scoring criteria, market-share comparisons, revenue analysis or other evidence that would establish an objective top 10. Treat it as a roundup of companies, not a numbered ranking by size, performance or importance.
That distinction is useful when using the list for job searches or industry orientation: it identifies examples across several parts of the ecosystem, but it is not a comprehensive directory or a basis for comparing employers. The article’s linked company profiles include Applied Materials, SiFive, Solaria and Alien Technology.
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