# Top 30 companies with in-house R&D in Sunnyvale

Tamtam tracks 30 companies with in-house R&D headquartered in Sunnyvale. This list ranks all of them by number of employees on LinkedIn, led by Synopsys Inc, LinkedIn and Fortinet. Their median headcount is 840. Half of them were founded in 2003 or later.

The companies with in-house R&D in Sunnyvale are primarily mid-sized to large firms specializing in software development, cybersecurity, and semiconductor manufacturing. Key players include Synopsys Inc, which provides silicon and systems design solutions, LinkedIn, connecting professionals globally, Fortinet, a computer and network security firm, and Juniper Networks, developing intelligent networking products. These companies reflect a concentration in high-tech sectors, particularly those focused on digital infrastructure and security.

A notable pattern among these companies is their strong presence in foundational digital technologies. Many, like JFrog, which offers a software supply chain platform, and Applied Intuition, a vehicle software supplier, focus on enabling other industries through specialized software and hardware. The majority of these firms were founded between the late 1990s and mid-2000s, indicating a mature yet continuously evolving technology hub.

🇺🇸 Sunnyvale · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Synopsys Inc](https://www.tamtam.ai/c/synopsys-inc) (synopsys.com)<br>It provides comprehensive silicon and systems design solutions, partnering with customers to enhance R&D capabilities and drive innovation across industries. | Software Development | 🇺🇸 Sunnyvale | 27,809 |  |
| 2 | [LinkedIn](https://www.tamtam.ai/c/linkedin) (careers.linkedin.com)<br>It connects professionals globally, offering services like Talent Solutions, Marketing Solutions, Sales Solutions, and Premium Subscriptions for productivity and success. | Software Development | 🇺🇸 Sunnyvale | 23,635 |  |
| 3 | [Fortinet](https://www.tamtam.ai/c/fortinet) (fortinet.com)<br>Fortinet enables trust in the digital world by protecting people, devices, and data for enterprises, service providers, and government organizations | Computer and Network Security | 🇺🇸 Sunnyvale | 16,304 | 2000 |
| 4 | [Juniper Networks](https://www.tamtam.ai/c/juniper-networks) (juniper.net)<br>Develops intelligent, agile, and secure networking products and solutions serving global service providers, enterprises, and government organizations worldwide. | Software Development | 🇺🇸 Sunnyvale | 9,059 | 1996 |
| 5 | [Proofpoint](https://www.tamtam.ai/c/proofpoint) (proofpoint.com)<br>A company specializing in cybersecurity and compliance solutions, protecting people across email, web, cloud, and social media channels effectively | Computer and Network Security | 🇺🇸 Sunnyvale | 5,200 |  |
| 6 | [Cepheid](https://www.tamtam.ai/c/cepheid) (cepheid.com)<br>Healthcare company pioneering molecular diagnostics with automated systems and tests for a wide range of infections, diseases, and oncology, delivering actionable results Partnered with industry leader for expertise and solutions | Biotechnology Research | 🇺🇸 Sunnyvale | 4,675 | 1996 |
| 7 | [Amazon Lab126](https://www.tamtam.ai/c/amazon-lab126) (amazon.jobs)<br>A San Francisco Bay Area team that designs and engineers consumer electronic devices such as Fire tablets, Kindle e-readers, and Amazon Echo | Computers and Electronics Manufacturing | 🇺🇸 Sunnyvale | 4,136 | 2004 |
| 8 | [JFrog](https://www.tamtam.ai/c/jfrog) (jfrog.com)<br>This company provides a software supply chain platform for automating trusted releases with end-to-end visibility, security, and control | Software Development | 🇺🇸 Sunnyvale | 2,417 | 2008 |
| 9 | [Finisar Corporation](https://www.tamtam.ai/c/finisar-corporation) (coherent.com)<br>Follow us at the provided link for updates and information about our rebranding as Coherent Corp Exciting changes ahead! | Telecommunications | 🇺🇸 Sunnyvale | 1,709 |  |
| 10 | [Applied Intuition](https://www.tamtam.ai/c/applied-intuition) (appliedintuition.com)<br>Vehicle software supplier accelerating safe and intelligent machines globally through simulation and validation platforms for automotive, trucking, and construction industries Headquarters in CA | Software Development | 🇺🇸 Sunnyvale | 1,593 | 2017 |
| 11 | [RUCKUS Networks](https://www.tamtam.ai/c/ruckus-networks) (ruckusnetworks.com)<br>The company builds purpose-driven networks for industries with high-performance wireless and wired solutions, IoT, assurance, security, and AI-driven software for exceptional connection experiences | Computer Networking Products | 🇺🇸 Sunnyvale | 1,388 | 2004 |
| 12 | [Fujitsu Americas](https://www.tamtam.ai/c/fujitsu-americas) (fujitsu.com)<br>Leading provider of IT services and solutions globally, specializing in consulting, systems integration, managed services, cloud services, and server technologies, with a focus on sustainability and innovation | IT Services and IT Consulting | 🇺🇸 Sunnyvale | 1,173 | 1935 |
| 13 | [Spansion is Cypress Semiconductor](https://www.tamtam.ai/c/spansion-is-cypress-semiconductor) (infineon.com)<br>A leading semiconductor company offering high-performance solutions for embedded systems in automotive, industrial, networking, consumer, and mobile devices worldwide | Semiconductor Manufacturing | 🇺🇸 Sunnyvale | 1,097 | 2003 |
| 14 | [Cerebras](https://www.tamtam.ai/c/cerebras) (cerebras.ai)<br>Accelerating deep learning through cutting-edge technology, including the fastest AI computer with a revolutionary chip for faster neural network training Join our team! | Semiconductor Manufacturing | 🇺🇸 Sunnyvale | 930 | 2015 |
| 15 | [Mellanox Technologies](https://www.tamtam.ai/c/mellanox-technologies)<br>A leading supplier of high-performance InfiniBand and Ethernet interconnect solutions for servers and storage, accelerating application run time and maximizing business results | Semiconductor Manufacturing | 🇺🇸 Sunnyvale | 840 | 1999 |
| 16 | [Cresta](https://www.tamtam.ai/c/cresta) (cresta.com)<br>It enhances contact center performance using generative AI for real-time insights, coaching, and tracking agent interactions to improve efficiency. | Software Development | 🇺🇸 Sunnyvale | 727 | 2017 |
| 17 | [Jumio Corporation](https://www.tamtam.ai/c/jumio-corporation) (jumio.com)<br>Provides AI-powered identity intelligence, anchored in biometric authentication and automation, to establish and maintain trust for organizations and fight fraud. | Software Development | 🇺🇸 Sunnyvale | 613 | 2010 |
| 18 | [Pharmacyclics, an AbbVie Company](https://www.tamtam.ai/c/pharmacyclics-an-abbvie-company) (pharmacyclics.com)<br>A biopharmaceutical company focused on developing novel cancer therapies to improve patient outcomes and address unmet medical needs | Pharmaceutical Manufacturing | 🇺🇸 Sunnyvale | 590 | 1991 |
| 19 | [Azul](https://www.tamtam.ai/c/azul) (azul.com)<br>Provides trusted open source Java platform with exceptional performance, security, and value, serving millions of developers and top global businesses. | Software Development | 🇺🇸 Sunnyvale | 555 | 2002 |
| 20 | [TiDB, powered by PingCAP](https://www.tamtam.ai/c/tidb-powered-by-pingcap) (pingcap.com)<br>Leading open-source distributed SQL database, powers modern applications with elasticity, versatility, reliability for world-renowned organizations. | Software Development | 🇺🇸 Sunnyvale | 508 | 2015 |
| 21 | [Real-Time Innovations (RTI)](https://www.tamtam.ai/c/real-time-innovations-rti) (rti.com)<br>RTI provides infrastructure software for intelligent distributed systems, supporting various industries including automotive, defense, energy, and healthcare with advanced technologies. | Software Development | 🇺🇸 Sunnyvale | 507 | 1991 |
| 22 | [Alpha & Omega Semiconductor](https://www.tamtam.ai/c/alpha-and-omega-semiconductor) (aosmd.com)<br>A global supplier of power semiconductors specializing in Power MOSFET, IGBT, IPM, and Power IC products for various advanced electronic applications | Semiconductor Manufacturing | 🇺🇸 Sunnyvale | 467 | 2000 |
| 23 | [Ceribell │ AI-Powered Point-of-Care EEG](https://www.tamtam.ai/c/ceribell-ai-powered-point-of-care-eeg) (ceribell.com)<br>A revolutionary AI-powered EEG system improving seizure management in acute care by providing rapid, accurate diagnostic information and continuous monitoring | Medical Equipment Manufacturing | 🇺🇸 Sunnyvale | 408 | 2014 |
| 24 | [IDEC USA](https://www.tamtam.ai/c/idec-usa) (idec.com)<br>A global manufacturer offering automation and control products with sales offices in the US, providing reliable solutions for over six decades | Automation Machinery Manufacturing | 🇺🇸 Sunnyvale | 280 | 1945 |
| 25 | [JSR Micro, Inc.](https://www.tamtam.ai/c/jsr-micro-inc) (jsrmicro.com)<br>A global provider of innovative semiconductor, life sciences, and energy materials, leveraging polymer expertise to address unique challenges across industries | Semiconductor Manufacturing | 🇺🇸 Sunnyvale | 266 | 1957 |
| 26 | [Lens Technology Inc.](https://www.tamtam.ai/c/lens-technology-inc) (hnlens.com)<br>High-tech manufacturing enterprise specializing in smart device components using various materials for appearance and functionality, serving global consumer electronics and automobile industries | Manufacturing | 🇺🇸 Sunnyvale | 75 |  |
| 27 | [Jina AI](https://www.tamtam.ai/c/jina-ai) (jina.ai)<br>Innovative multimodal AI technology company empowering developers to build applications and businesses to excel in the modern AI era globally | Software Development | 🇺🇸 Sunnyvale | 46 | 2020 |
| 28 | [DynoSense Corp](https://www.tamtam.ai/c/dynosense-corp) (dynosense.com)<br>A medical technology company focused on creating innovative products and services for a better, longer, and healthier life | Medical Equipment Manufacturing | 🇺🇸 Sunnyvale | 11 | 2013 |
| 29 | [Modified Polymer Components, Inc.](https://www.tamtam.ai/c/modified-polymer-components-inc) (modifiedpolymer.com)<br>Specializing in design, rapid prototyping, and manufacturing of precise components for Medical Device OEMs and various other industries since 1989 | Medical Equipment Manufacturing | 🇺🇸 Sunnyvale | 9 | 1989 |
| 30 | [PYROMERAL Technology Inc](https://www.tamtam.ai/c/pyromeral-technology-inc) (pyromeraltechnology.com)<br>The company specializes in high-temperature ceramic composite components, offering practical, cost-effective alternatives with superior mechanical properties for various industries | Aviation and Aerospace Component Manufacturing | 🇺🇸 Sunnyvale | 4 | 2023 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

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## The same list elsewhere in United States

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Source: https://www.tamtam.ai/l/r-and-d-companies-sunnyvale