These large California-based companies with in-house R&D are primarily focused on software development, technology, and internet services, alongside significant players in entertainment and healthcare. Key examples include Google, known for its search engine and web services; Apple, which designs and manufactures consumer electronics; The Walt Disney Company, an entertainment provider; and Kaiser Permanente, a not-for-profit health plan. The list also features Meta, focused on social technology platforms, and Uber, a global platform for transportation and delivery services.A notable pattern in this data is the concentration of headquarters in the San Francisco Bay Area. Cities like Mountain View, Cupertino, Menlo Park, and San Francisco itself host a significant number of these large R&D-driven enterprises. This indicates a strong regional hub for technological innovation and corporate research and development within California.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Googlegoogle.com
Provides a powerful search engine, web services, and advertising tools to help users find information and businesses reach customers |
304,428 | |||
| 2 |
The Walt Disney Companythewaltdisneycompany.com
An entertainment company creating magical experiences through animated features, theme park attractions, sports coverage, and television shows for global audiences |
220,000 | |||
| 3 | 184,384 | ||||
| 4 | 164,418 | ||||
| 5 | 160,913 | ||||
| 6 |
University of Californiajobs.universityofcalifornia.edu
Educating top minds, advancing research, engaging communities, supporting economy, improving health, protecting environment, and driving innovation across California. |
152,503 | |||
| 7 | 142,944 | ||||
| 8 |
Kaiser Permanentehealthy.kaiserpermanente.org
Leading not-for-profit health plan with a unique business model driving industry improvements, serving millions of members across multiple states and impacting communities positively |
137,397 | |||
| 9 |
YouTubeyoutube.com
Team-oriented, creative workplace within Google, developing and rolling out key features and products quickly Headquartered in San Bruno Opportunities globally |
113,401 | |||
| 10 | 109,404 | ||||
| 11 | 95,899 | ||||
| 12 |
TikToktiktok.com
A leading platform for short-form video, fostering creativity and innovation with a flat company structure and global presence for career growth opportunities |
91,370 | |||
| 13 |
Salesforcesalesforce.com
It provides customer relationship management solutions, integrating data, artificial intelligence, and a focus on trust to enhance customer experiences. |
86,347 | |||
| 14 |
DoorDashcareersatdoordash.com
A tech and logistics company focused on empowering local economies through delivery services, with a mission to expand beyond food delivery |
80,754 | |||
| 15 |
Airbnbairbnb.com
The company offers unique stays and experiences worldwide through a platform connecting hosts with guests, fostering community connections |
72,938 | |||
| 16 | 57,548 | ||||
| 17 |
Broadcombroadcom.com
A leading global infrastructure technology company with a rich history of innovation, collaboration, and engineering excellence spanning over 60 years |
54,926 | |||
| 18 |
NVIDIAnvidia.com
A pioneering company in accelerated computing, known for inventing the GPU, shaping PC gaming, computer graphics, AI development, and creating the metaverse |
48,336 | |||
| 19 | 47,988 | ||||
| 20 | 42,354 | ||||
| 21 | 40,813 | ||||
| 22 |
Mattel, Inc.mattel.com
A purpose-driven company creating innovative products and experiences to inspire, entertain, and develop children through play, with iconic brands and global presence |
37,000 | |||
| 23 |
GlobalLogicgloballogic.com
A global product development services leader, combining software engineering expertise and industry experience to help customers design and deliver next-generation products and digital experiences |
35,494 | |||
| 24 |
ServiceNowservicenow.com
Cloud-based platform digitizes and unifies organizations to streamline work processes, connect employees and customers, and enable innovation and agility Creating a smarter future |
35,136 | |||
| 25 |
Applied Materialsappliedmaterials.com
Leader in materials engineering solutions essential for semiconductor and advanced display technologies, enabling AI advancement and next-generation chip commercialization. |
31,512 | |||
| 26 | 30,900 | ||||
| 27 |
Stanford Universitystanford.edu
Leading research university fostering innovation, education, and global citizenship with extensive resources, diverse programs, and strong community partnerships. |
28,573 | |||
| 28 |
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 | |||
| 29 | 27,000 | ||||
| 30 |
Experianexperianplc.com
Global information services company empowering consumers and clients to manage data confidently, make smarter decisions, prevent fraud, and maximize opportunities worldwide |
26,255 | |||
| 31 |
Workdayworkday.com
Unifying human resources and finance on an AI-powered platform for high-impact outcomes through superintelligence, putting AI agents to work for people. |
25,233 | |||
| 32 |
Agilent Technologiesagilent.com
Innovative company providing advanced analytical, research, and diagnostic solutions for various industries worldwide, including healthcare, environmental safety, and energy solutions |
25,000 | |||
| 33 |
University of California, Berkeleyberkeley.edu
Public research university offering diverse academic programs, fostering innovation, and serving as a flagship institution in California. |
24,082 | |||
| 34 |
University of Southern Californiausc.edu
A leading private research university located in Los Angeles, focused on academic excellence and fostering a community of alumni and students |
23,894 | |||
| 35 |
Electronic Arts (EA)ea.com
Develops and publishes interactive entertainment and video games, fostering a global community with creativity and player engagement. |
23,703 | |||
| 36 |
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 | |||
| 37 |
Sanminasanmina.com
A leading integrated manufacturing solutions provider offering end-to-end services to OEMs in various industries worldwide |
22,931 | |||
| 38 |
WDwesterndigital.com
This company creates innovative data storage solutions for current technology and future advancements |
22,696 | |||
| 39 |
Palo Alto Networkspaloaltonetworks.com
A global cybersecurity leader addressing security challenges through continuous innovation with artificial intelligence, analytics, automation, and orchestration for organizations worldwide |
22,680 | |||
| 40 |
University of California, Davisucdavis.edu
Public university offering diverse undergraduate and graduate programs, conducting extensive research, fostering innovation, and preparing future leaders across multiple disciplines. |
21,439 | |||
| 41 |
SpaceXspacex.com
A company specializing in designing, manufacturing, and launching advanced rockets and spacecraft with a goal of making life multiplanetary |
20,008 | |||
| 42 |
Netflixnetflix.com
A global entertainment service offering a wide range of TV shows, movies, and games in multiple genres and languages for millions of paid members worldwide |
18,533 | |||
| 43 | 18,287 | ||||
| 44 |
Intuitintuit.com
A global technology platform helping customers overcome financial challenges, providing solutions like TurboTax, QuickBooks, Credit Karma, and Mailchimp |
18,222 | |||
| 45 |
Broadcom Softwarebroadcom.com
Global software leader optimizing and protecting complex hybrid environments for multinational companies with industry-leading business-critical software, enabling scalability, agility, and security |
17,981 | |||
| 46 |
UCLA Healthuclahealth.org
Comprehensive healthcare system with top-ranked hospitals, advanced medical technology, expert physicians, and pioneering biomedical research across multiple specialties. |
17,812 | |||
| 47 |
Rodan + Fieldsrodanandfields.com
A skincare company founded by dermatologists focusing on giving people the best skin and confidence, with a commitment to social impact |
17,749 | |||
| 48 |
Levi Strauss & Co.levistrauss.com
designs and markets iconic denim jeans and apparel brands, emphasizing sustainability, innovation, and global self-expression through fashion. |
17,743 | |||
| 49 |
Lam Researchlamresearch.com
Design and manufacture advanced equipment that enables semiconductor chipmakers to innovate and drive technological progress across various industries. |
17,202 | |||
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. | |||||
| 50 | 16,886 | ||||
| 51 |
Cedars-Sinaicareers.cshs.org
Comprehensive healthcare provider excelling in patient care, pioneering research, advanced medical education, and community health improvement in Los Angeles. |
16,865 | |||
| 52 |
Seagate Technologyseagate.com
Leading provider of scalable mass-capacity data storage solutions, ensuring trust and integrity for innovations relying on vast data volumes. |
16,700 | |||
| 53 |
Fortinetfortinet.com
Fortinet enables trust in the digital world by protecting people, devices, and data for enterprises, service providers, and government organizations |
16,304 | |||
| 54 |
Skecherscareers.skechers.com
A global brand that creates stylish, comfortable, and innovative footwear, apparel, and accessories for men, women, and children at affordable prices |
16,264 | |||
| 55 |
Stripestripe.com
Financial infrastructure platform enabling businesses to accept payments, increase revenue, and explore new opportunities to grow in San Francisco and Dublin |
16,031 | |||
| 56 |
Databricksdatabricks.com
It provides a Data Intelligence Platform for organizations to manage their data effectively and leverage AI for better decision-making. |
15,896 | |||
| 57 |
Williams-Sonoma, Inc.williams-sonomainc.com
Specialty retailer offering high-quality kitchenware, furniture, and home decor through brands like Pottery Barn and West Elm across global multi-channel retail platforms. |
15,546 | |||
| 58 |
Autodeskautodesk.com
It provides software for architecture, engineering, construction, and media, enabling users to design, collaborate, and solve various challenges effectively. |
15,378 | |||
| 59 |
Stanford Health Carestanfordhealthcare.org
Providing advanced, coordinated care in multiple specialties including cancer, neurosciences, cardiovascular, surgery, and organ transplant with innovative research and compassionate treatment. |
15,318 | |||
| 60 |
Herbalifeherbalife.com
Global health and wellness company offering nutrition products, coaching support, and business opportunities to empower personal growth and community impact. |
15,172 | |||
| 61 |
American Honda Motor Company, Inc.honda.com
Design and manufacture cars, trucks, advanced light jets, and mobility solutions focused on enhancing life potential and environmental responsibility. |
15,103 | |||
| 62 |
Gilead Sciencesgilead.com
A company focused on delivering innovative medicines in virology and oncology, addressing health inequities, and empowering people to live healthier lives |
14,891 | |||
| 63 |
Equinixequinix.com
A global digital infrastructure company empowering businesses to access foundational infrastructure, partners, and possibilities to accelerate advantage and multiply value |
14,710 | |||
| 64 | 14,695 | ||||
| 65 |
Edwards Lifesciencesedwards.com
Develops breakthrough structural heart technologies and medical devices for patients, partnering with clinicians to improve lives globally across over 100 countries. |
14,148 | |||
| 66 |
Keysight Technologieskeysight.com
Empowers innovators to explore, design, and bring world-changing technologies to life by solving design, emulation, and test challenges to help create the best product experiences |
13,893 | |||
| 67 |
Pinterestpinterest.com
It is a visual inspiration platform with 482 million monthly active users, helping people search, save, and shop ideas. |
13,766 | |||
| 68 |
Intuitiveintuitive.com
A global technology leader in minimally invasive care and robotic-assisted surgery, utilizing intelligent technology to enhance patient outcomes without constraints |
13,240 | |||
| 69 |
Sony Interactive Entertainmentsonyinteractive.com
A global leader in entertainment and innovation, delivering cutting-edge hardware, network services, and award-winning games through the PlayStation line of products |
13,000 | |||
| 70 |
Symantecbroadcom.com
It offers comprehensive cybersecurity solutions for Endpoint, Network, Data, and Cloud security, catering to both individuals and enterprises. |
12,852 | |||
| 71 |
NetAppnetapp.com
It builds intelligent data infrastructure, enabling applications to utilize any data from anywhere, enhancing data management and accessibility. |
12,680 | |||
| 72 |
City of Hopecityofhope.org
Comprehensive cancer research, treatment, and innovation with a national network, focusing on breakthrough medicines and patient care integration. |
12,442 | |||
| 73 | 12,038 | ||||
| 74 |
Riviancareers.rivian.com
Innovative team dedicated to challenging conventional thinking and seeking new solutions to protect the outdoors for future generations |
11,979 | |||
| 75 |
Marvell Technologymarvell.com
Specializing in infrastructure technology, we collaborate closely with clients to deliver tailored solutions, leveraging innovation and partnership to drive progress and success |
11,815 | |||
| 76 | 11,656 | ||||
| 77 |
Cadencecadence.com
Development of software, hardware, and IP enabling innovative electronic product design across diverse markets like 5G, automotive, aerospace, and healthcare. |
11,424 | |||
| 78 |
VMwarebroadcom.com
Leading provider of multi-cloud services enabling digital innovation with enterprise control Cultivating innovation to solve customer challenges with disruptive technologies |
11,230 | |||
| 79 |
General Atomicsga.com
Development of advanced technology solutions including unmanned aerial vehicles, research reactors, aircraft systems, MagLev transport, and fusion energy for global customers. |
11,213 | |||
| 80 |
UC San Diego Healthemployment.ucsd.edu
A leading academic health system in San Diego region, offering outstanding patient care, cutting-edge research, medical education, and community health programs |
10,962 | |||
| 81 |
Beckman Coulter Diagnosticsbeckmancoulter.com
Develops and provides advanced diagnostic solutions for complex clinical testing in hospitals, reference laboratories, and physician offices to improve patient health. |
10,628 | |||
| 82 |
UC Santa Barbaraucsb.edu
A renowned institution on the California coast, UCSB fosters academic excellence and creativity, showcasing achievements and connecting the Gaucho community |
10,619 | |||
| 83 |
Veeva Systemsveeva.com
Cloud-based software solutions for global life sciences industry, serving pharmaceutical companies and biotechs with innovation and customer success. |
10,036 | |||
| 84 |
Robloxcareers.roblox.com
A platform where millions of creators build immersive virtual experiences for people to connect, learn, work, play, and socialize together |
9,978 | |||
| 85 |
Nutanixnutanix.com
Global leader in cloud software, providing a platform for running apps and data across clouds, simplifying operations for businesses worldwide |
9,917 | |||
| 86 |
Teradatateradata.com
The company specializes in providing a cloud analytics and data platform that empowers organizations with harmonized data and trusted AI/ML for confident decision-making and impactful results |
9,882 | |||
| 87 | 9,873 | ||||
| 88 |
University of California, Santa Cruzucsc.edu
A pioneering university with a focus on social justice, groundbreaking research, and a unique academic environment, producing influential alumni worldwide |
9,767 | |||
| 89 |
Illuminaillumina.com
The company develops innovative technologies and assays for genetic analysis, enabling personalized medicine and advancing disease research, drug development, and molecular testing |
9,673 | |||
| 90 |
UC Davis Healthhealth.ucdavis.edu
Academic health system with top medical school, hospital, research centers, nursing school, and community partnerships advancing patient care and health innovation. |
9,647 | |||
| 91 |
Lawrence Livermore National Laboratoryllnl.gov
Development and application of advanced science, technology, and engineering to enhance national security, counterterrorism, defense, energy, and environmental challenges. |
9,546 | |||
| 92 |
Bio-Rad Laboratoriesbio-rad.com
Development and supply of innovative products for life science research and medical diagnostics, enhancing discovery and clinical results worldwide. |
9,416 | |||
| 93 |
Stanford University School of Medicinemed.stanford.edu
Premier academic hub combining research, education, and clinical care to advance health through innovation, leadership, and collaborative discoveries. |
9,384 | |||
| 94 |
Logitechlogitech.com
Innovative hardware and software solutions bringing people together in work, creation, gaming, and streaming, with a focus on sustainability |
9,325 | |||
| 95 |
OpenAIopenai.com
An AI research and deployment company focused on creating safe and beneficial general-purpose artificial intelligence for the benefit of humanity |
9,268 | |||
| 96 |
ICU Medicalicumed.com
Specializes in safe, innovative IV therapy products, smart pumps, software, and consumables designed to improve patient care and safety. |
9,144 | |||
| 97 |
Juniper Networksjuniper.net
Develops intelligent, agile, and secure networking products and solutions serving global service providers, enterprises, and government organizations worldwide. |
9,059 | |||
| 98 |
Dexcomdexcom.com
A leader in continuous glucose monitoring technology, empowering individuals with diabetes to control their health and pursue their dreams |
8,997 | |||
| 99 |
Zscalerzscaler.com
Leading organization enabling secure network and application transformation for mobile and cloud-first world, offering fast, secure, cloud-delivered services globally for enhanced cybersecurity |
8,865 | |||
Turn this list into pipeline
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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 11, 2026.
More company lists in California
- The largest companies in California 15,265
- Multinational companies in California 2,592
- SaaS companies in California 1,855
- Software Development companies in California 1,650
- AI companies in California 1,297
- Manufacturers in California 1,066
- Hardware manufacturers in California 985
- IT Services and IT Consulting companies in California 968
- Education providers in California 950
- Subscription businesses in California 940
- Venture capital and private equity firms in California 917
- Professional services firms in California 880
- Companies with a mobile app in California 827
- Retail chains in California 803
- IT services companies in California 796
- Venture Capital and Private Equity Principals companies in California 731
- Financial services firms in California 711
- Financial Services companies in California 642
- Healthcare providers in California 569
- AI-native companies in California 561
- Hospitals and Health Care companies in California 555
- Consulting firms in California 551
- Public sector organisations in California 535
- Technology, Information and Internet companies in California 514
The same list elsewhere in United States
- Companies with in-house R&D in the United States 6,796
- Companies with in-house R&D in Texas 442
- Companies with in-house R&D in New York State 419
- Companies with in-house R&D in Massachusetts 396
- Companies with in-house R&D in Illinois 322
- Companies with in-house R&D in Michigan 287
- Companies with in-house R&D in Ohio 277
- Companies with in-house R&D in Pennsylvania 255
- Companies with in-house R&D in New Jersey 224
- Companies with in-house R&D in Florida 221
- Companies with in-house R&D in Alabama 214
- Companies with in-house R&D in Georgia 173
- Companies with in-house R&D in Virginia 166
- Companies with in-house R&D in North Carolina 158
- Companies with in-house R&D in Wisconsin 154
- Companies with in-house R&D in Minnesota 146
- Companies with in-house R&D in Washington State 140
- Companies with in-house R&D in Colorado 113
- Companies with in-house R&D in Maryland 107
- Companies with in-house R&D in Indiana 104
- Companies with in-house R&D in New York 223
- Companies with in-house R&D in San Francisco 147
- Companies with in-house R&D in Houston 129
- Companies with in-house R&D in San Jose 103