# Multinational companies headquartered in Sunnyvale

Tamtam tracks 51 multinational companies headquartered in Sunnyvale. This list ranks the 30 largest by number of employees on LinkedIn, led by Synopsys Inc, LinkedIn and Fortinet. Their median headcount is 1,311. Half of them were founded in 2003 or later.

The companies in Sunnyvale are primarily mid-sized to large firms in software development, IT services, and cybersecurity. Notable examples include Synopsys Inc, which provides silicon and systems design solutions, and LinkedIn, a global professional networking platform. Fortinet specializes in computer and network security, while Juniper Networks develops intelligent networking products. Xoriant is a digital engineering firm, and Proofpoint focuses on cybersecurity and compliance solutions.

A common pattern among these companies is their focus on technology infrastructure and digital solutions. Many were founded in the 1990s and early 2000s, indicating a mature technology hub. The presence of companies like Applied Intuition, which supplies vehicle software, and Clover, offering point-of-sale solutions, shows a diverse application of software development across various sectors.

🇺🇸 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 | [Xoriant](https://www.tamtam.ai/c/xoriant) (xoriant.com)<br>Xoriant is a global digital engineering firm that turns imaginative visions into realities, accelerating business outcomes with innovative technology solutions | IT Services and IT Consulting | 🇺🇸 Sunnyvale | 5,220 | 1990 |
| 6 | [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 |  |
| 7 | [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 |
| 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 | [Good Powered by BlackBerry](https://www.tamtam.ai/c/good-powered-by-blackberry) (blackberry.com)<br>Provider of secure mobile solutions including device management, collaboration apps, and analytics for enterprises and governments worldwide. | Wireless Services | 🇺🇸 Sunnyvale | 2,065 | 1996 |
| 10 | [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 |  |
| 11 | [Clover](https://www.tamtam.ai/c/clover-sunnyvale) (clover.com)<br>Innovative point of sale solutions for small & medium businesses, enhancing customer interactions and creating a seamless commerce operating system Join our team in Sunnyvale, CA! | Technology, Information and Internet | 🇺🇸 Sunnyvale | 1,685 | 2011 |
| 12 | [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 |
| 13 | [Upwork](https://www.tamtam.ai/c/upwork-sunnyvale) (upwork.com)<br>A global platform connecting businesses with independent talent, unlocking potential through trust-driven collaboration across a wide range of skills | IT Services and IT Consulting | 🇺🇸 Sunnyvale | 1,487 |  |
| 14 | [Intermedia Intelligent Communications](https://www.tamtam.ai/c/intermedia-intelligent-communications) (intermedia.com)<br>Cloud communications company providing integrated solutions for voice, video, chat, contact center, email, security, and more, with a focus on exceptional customer service and partner support | IT Services and IT Consulting | 🇺🇸 Sunnyvale | 1,381 | 1993 |
| 15 | [Plug and Play](https://www.tamtam.ai/c/plug-and-play) (plugandplaytechcenter.com)<br>global platform connecting startups, corporations, investors across multiple industries to foster innovation, investment, and collaboration worldwide. | Venture Capital and Private Equity Principals | 🇺🇸 Sunnyvale | 1,311 | 2006 |
| 16 | [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 |
| 17 | [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 |
| 18 | [Illumio](https://www.tamtam.ai/c/illumio-sunnyvale) (illumio.com)<br>Leading ransomware, breach containment; redefining cyberattack containment, operational resilience; AI security graph identifies, contains threats across hybrid multi-cloud environments; stopping attack spread. | Computer and Network Security | 🇺🇸 Sunnyvale | 916 | 2013 |
| 19 | [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 |
| 20 | [eGain Corporation](https://www.tamtam.ai/c/egain-corporation) (egain.com)<br>AI-powered knowledge management platform enhancing customer experience and reducing service costs for Fortune 500 clients and government agencies. | Software Development | 🇺🇸 Sunnyvale | 782 | 1997 |
| 21 | [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 |
| 22 | [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 |
| 23 | [R.S. Hughes Co., Inc.](https://www.tamtam.ai/c/r-s-hughes-co-inc) (rshughes.com)<br>Dynamic distributor of industrial supplies, with extensive inventory of products from leading manufacturers Specializing in sales and service solutions for manufacturing companies | Wholesale | 🇺🇸 Sunnyvale | 555 | 1954 |
| 24 | [Indium Software - Independent Software Testing Company](https://www.tamtam.ai/c/indium-software-independent-software-testing-company) (indiumsoft.com)<br>Global Independent Software Testing Services Company with a focus on multiple domains, offering on-demand QA services, specialized testing, and innovative frameworks for accelerated testing | IT Services and IT Consulting | 🇺🇸 Sunnyvale | 523 | 1999 |
| 25 | [HackerEarth](https://www.tamtam.ai/c/hackerearth) (hackerearth.com)<br>Developer assessment software helping companies accurately measure developer skills, improve engineering hires, reduce recruiter screening time, and engage developers in hackathons and coding challenges | Software Development | 🇺🇸 Sunnyvale | 512 | 2012 |
| 26 | [SMARTe](https://www.tamtam.ai/c/smarte) (smarte.pro)<br>It provides a B2B sales intelligence platform that integrates with sales tools, offering contact insights and enhancing sales workflows for teams. | Software Development | 🇺🇸 Sunnyvale | 473 | 2005 |
| 27 | [ThinkSys Inc](https://www.tamtam.ai/c/thinksys-inc) (thinksys.com)<br>An award-winning technology company providing software development, QA, and IT services worldwide, with a focus on customer satisfaction and quality solutions | IT Services and IT Consulting | 🇺🇸 Sunnyvale | 453 | 2012 |
| 28 | [Crazy Maple Studio](https://www.tamtam.ai/c/crazy-maple-studio) (crazymaplestudios.com)<br>A Bay Area start-up offering mobile gaming, reading, and streaming experiences Users can enjoy interactive stories, write romance, and watch HD content | Entertainment Providers | 🇺🇸 Sunnyvale | 414 | 2016 |
| 29 | [Surabhi](https://www.tamtam.ai/c/surabhi) (surabhillc.com)<br>A multifaceted company specializing in healthcare revenue cycle management, medical equipment distribution, and BPO support services with a focus on quality and efficiency | Business Consulting and Services | 🇺🇸 Sunnyvale | 377 | 2014 |
| 30 | [HCL Unica](https://www.tamtam.ai/c/hcl-unica) (hcl-software.com)<br>Marketing software for digital transformation, empowering organizations with enterprise marketing solutions for valuable customer relationships and measurable business outcomes | Software Development | 🇺🇸 Sunnyvale | 360 | 1992 |

## 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

- [Multinational companies in the United States](https://www.tamtam.ai/l/multinational-companies-united-states) (16,197)
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## The same list elsewhere

- [Multinational companies in the world](https://www.tamtam.ai/l/multinational-companies-in-the-world) (74,925)
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Source: https://www.tamtam.ai/l/multinational-companies-sunnyvale