This selection of large and mid-sized companies in Sunnyvale focuses on artificial intelligence, with a strong emphasis on software development and cybersecurity. Companies like Synopsys Inc provide silicon and systems design solutions, while LinkedIn connects professionals globally. Fortinet specializes in protecting digital environments, and Xoriant offers digital engineering services. Applied Intuition accelerates safe and intelligent machines, and Cerebras focuses on deep learning technology.
Several companies on this list were founded in the 2010s, indicating a recent growth in AI-focused enterprises in Sunnyvale. For example, Applied Intuition was founded in 2017, Cerebras in 2015, and Illumio in 2013. These younger firms often operate alongside more established entities such as Fortinet, founded in 2000, and Xoriant, founded in 1990.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Synopsys Incsynopsys.com
It provides comprehensive silicon and systems design solutions, partnering with customers to enhance R&D capabilities and drive innovation across industries. |
27,809 | |||
| 2 |
LinkedIncareers.linkedin.com
It connects professionals globally, offering services like Talent Solutions, Marketing Solutions, Sales Solutions, and Premium Subscriptions for productivity and success. |
23,635 | |||
| 3 |
Fortinetfortinet.com
Fortinet enables trust in the digital world by protecting people, devices, and data for enterprises, service providers, and government organizations |
16,304 | |||
| 4 |
Xoriantxoriant.com
Xoriant is a global digital engineering firm that turns imaginative visions into realities, accelerating business outcomes with innovative technology solutions |
5,220 | |||
| 5 |
Proofpointproofpoint.com
A company specializing in cybersecurity and compliance solutions, protecting people across email, web, cloud, and social media channels effectively |
5,200 | |||
| 6 |
Applied Intuitionappliedintuition.com
Vehicle software supplier accelerating safe and intelligent machines globally through simulation and validation platforms for automotive, trucking, and construction industries Headquarters in CA |
1,593 | |||
| 7 |
RUCKUS Networksruckusnetworks.com
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 |
1,388 | |||
| 8 |
Cerebrascerebras.ai
Accelerating deep learning through cutting-edge technology, including the fastest AI computer with a revolutionary chip for faster neural network training Join our team! |
930 | |||
| 9 |
Illumioillumio.com
Leading ransomware, breach containment; redefining cyberattack containment, operational resilience; AI security graph identifies, contains threats across hybrid multi-cloud environments; stopping attack spread. |
916 | |||
| 10 |
eGain Corporationegain.com
AI-powered knowledge management platform enhancing customer experience and reducing service costs for Fortune 500 clients and government agencies. |
782 | |||
| 11 |
Crestacresta.com
It enhances contact center performance using generative AI for real-time insights, coaching, and tracking agent interactions to improve efficiency. |
727 | |||
| 12 |
Evergent Technologies Inc.evergent.com
A leading provider of subscription and partner management solutions, offering enterprise-grade software for subscription management, monetization, royalties, customer retention, and brand loyalty |
663 | |||
| 13 |
Ooma, Inc.ooma.com
The company creates innovative communications solutions for businesses and consumers, offering cloud-based telephony, home security, HD voice quality, mobile integration, and smart connected devices |
652 | |||
| 14 | 618 | ||||
| 15 |
Jumio Corporationjumio.com
Provides AI-powered identity intelligence, anchored in biometric authentication and automation, to establish and maintain trust for organizations and fight fraud. |
613 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Matterportmatterport.com
Revolutionizing the built world through spatial computing technology, turning buildings into data for improved planning, construction, operations, and marketing worldwide |
531 | |||
| 17 |
Indium Software - Independent Software Testing Companyindiumsoft.com
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 |
523 | |||
| 18 |
HackerEarthhackerearth.com
Developer assessment software helping companies accurately measure developer skills, improve engineering hires, reduce recruiter screening time, and engage developers in hackathons and coding challenges |
512 | |||
| 19 |
TiDB, powered by PingCAPpingcap.com
Leading open-source distributed SQL database, powers modern applications with elasticity, versatility, reliability for world-renowned organizations. |
508 | |||
| 20 |
Yugabyteyugabyte.com
Innovative company behind YugabyteDB, a distributed database for cloud native applications, offering high performance, global data distribution, and seamless Kubernetes deployment |
486 | |||
| 21 |
Ceribell │ AI-Powered Point-of-Care EEGceribell.com
A revolutionary AI-powered EEG system improving seizure management in acute care by providing rapid, accurate diagnostic information and continuous monitoring |
408 | |||
| 22 |
Fission Labsfissionlabs.com
Software development company offering end-to-end technology solutions including product development, cloud engineering, big data analytics, DevOps consulting, and AI/ML solutions |
407 | |||
| 23 |
HCL Unicahcl-software.com
Marketing software for digital transformation, empowering organizations with enterprise marketing solutions for valuable customer relationships and measurable business outcomes |
360 | |||
| 24 |
Emumbaemumba.com
Emumba is a software services company based in Islamabad, specializing in frontend, backend, QA, and DevOps for world-class clients worldwide |
330 | |||
| 25 |
Lyriclyric.tech
Empower supply chain teams with data, advanced science, configurable workflows, and apps to create smarter, sustainable supply chain solutions. |
307 | |||
| 26 |
KloudGinkloudgin.com
A mobile-first, cloud-based solution for field service and asset management, automating work processes, boosting worker productivity, and enabling new revenue streams |
239 | |||
| 27 |
SutiSoft, Inc.sutisoft.com
A leading provider of integrated business management solutions, offering both on-premise and on-demand solutions with a focus on customization and ease of integration |
195 | |||
| 28 |
Caspiocaspio.com
An all-in-one low-code platform for creating data-driven apps, enabling users to streamline operations, automate workflows, and improve customer experience globally |
193 | |||
| 29 |
Rubedo Life Sciencesrubedolife.com
A biopharmaceutical company in Sunnyvale, CA, developing therapies targeting senescent cells involved in chronic age-related diseases using a proprietary drug discovery platform |
34 | |||
| 30 | 30 | ||||
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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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