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Top 99 companies with in-house R&D in California

Tamtam tracks 1,276 companies with in-house R&D headquartered in California. This list ranks the 99 largest by number of employees on LinkedIn, led by Google, The Walt Disney Company and Apple. Their median headcount is 16,886. Half of them were founded in 1982 or later. The most common headquarters are San Francisco (12), San Jose (12) and Santa Clara (9).

馃嚭馃嚫 California99 companiesUpdated Nov 11, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
1
Googlegoogle.com

Provides a powerful search engine, web services, and advertising tools to help users find information and businesses reach customers

Software Development 馃嚭馃嚫 Mountain View 304,428 n/a
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

Entertainment Providers 馃嚭馃嚫 Burbank 220,000 n/a
3
Appleapple.com

Designs and manufactures innovative consumer electronics, including iPhones, iPads, and Macs, known for their user-friendly interfaces and sleek design

Computers and Electronics Manufacturing 馃嚭馃嚫 Cupertino 184,384 1976
4
Metameta.com

Focuses on creating social technology platforms, including virtual and augmented reality experiences, and operates popular apps like Facebook and Instagram to connect people globally

Software Development 馃嚭馃嚫 Menlo Park 164,418 n/a
5
Uberuber.com

Global platform powering flexible earnings and movement of people and things, constantly reimagining how to enable transportation and delivery services worldwide

Internet Marketplace Platforms 馃嚭馃嚫 San Francisco 160,913 n/a
6
University of Californiajobs.universityofcalifornia.edu

Educating top minds, advancing research, engaging communities, supporting economy, improving health, protecting environment, and driving innovation across California.

Higher Education 馃嚭馃嚫 Oakland 152,503 n/a
7
HPhp.com

This company creates technology solutions aiming to inspire innovation and make extraordinary contributions to humanity through climate action, human rights, and digital equity

IT Services and IT Consulting 馃嚭馃嚫 Palo Alto 142,944 n/a
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

Hospitals and Health Care 馃嚭馃嚫 Oakland 137,397 1945
9
YouTubeyoutube.com

Team-oriented, creative workplace within Google, developing and rolling out key features and products quickly Headquartered in San Bruno Opportunities globally

Technology, Information and Internet 馃嚭馃嚫 San Bruno 113,401 n/a
10
Intelintel.com

This company drives innovation in AI, analytics, and cloud-to-edge technology to shape a better future through breakthroughs in self-driving cars, environmental conservation, and daily conveniences

Semiconductor Manufacturing 馃嚭馃嚫 Santa Clara 109,404 n/a
11
Ciscocisco.com

A technology company founded in 1984, specializing in hardware, software, and services for Internet solutions and networking technologies

Software Development 馃嚭馃嚫 San Jose 95,899 1984
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

Entertainment Providers 馃嚭馃嚫 Los Angeles 91,370 n/a
13
Salesforcesalesforce.com

It provides customer relationship management solutions, integrating data, artificial intelligence, and a focus on trust to enhance customer experiences.

Software Development 馃嚭馃嚫 San Francisco 86,347 n/a
14
DoorDashcareersatdoordash.com

A tech and logistics company focused on empowering local economies through delivery services, with a mission to expand beyond food delivery

Software Development 馃嚭馃嚫 San Francisco 80,754 n/a
15
Airbnbairbnb.com

The company offers unique stays and experiences worldwide through a platform connecting hosts with guests, fostering community connections

Software Development 馃嚭馃嚫 San Francisco 72,938 2007
16
Qualcommqualcomm.com

Providing widespread intelligent computing solutions

Semiconductor Manufacturing 馃嚭馃嚫 San Diego 57,548 n/a
17
Broadcombroadcom.com

A leading global infrastructure technology company with a rich history of innovation, collaboration, and engineering excellence spanning over 60 years

Semiconductor Manufacturing 馃嚭馃嚫 Palo Alto 54,926 n/a
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

Computer Hardware Manufacturing 馃嚭馃嚫 Santa Clara 48,336 1993
19
AMDamd.com

A company focused on transforming lives with AMD technology through innovative products for data centers, AI, PCs, gaming, and embedded systems

Semiconductor Manufacturing 馃嚭馃嚫 Santa Clara 47,988 1969
20
Adobeadobe.com

It provides digital media and marketing solutions, enabling users to create and deliver engaging experiences for various audiences effectively.

Software Development 馃嚭馃嚫 San Jose 42,354 1982
21
Amgenamgen.com

This biotechnology company focuses on discovering and developing innovative therapeutics to improve health outcomes for patients with serious illnesses worldwide

Biotechnology Research 馃嚭馃嚫 Thousand Oaks 40,813 1980
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

Manufacturing 馃嚭馃嚫 El Segundo 37,000 1945
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

Software Development 馃嚭馃嚫 Santa Clara 35,494 n/a
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

Software Development 馃嚭馃嚫 Santa Clara 35,136 n/a
25
Applied Materialsappliedmaterials.com

Leader in materials engineering solutions essential for semiconductor and advanced display technologies, enabling AI advancement and next-generation chip commercialization.

Semiconductor Manufacturing 馃嚭馃嚫 Santa Clara 31,512 1967
26
Visavisa.com

A global leader in digital payments, connecting consumers, merchants, and financial institutions across 200+ countries with secure transaction solutions

IT Services and IT Consulting 馃嚭馃嚫 Foster City 30,900 n/a
27
Stanford Universitystanford.edu

Leading research university fostering innovation, education, and global citizenship with extensive resources, diverse programs, and strong community partnerships.

Higher Education 馃嚭馃嚫 Stanford 28,573 n/a
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.

Software Development 馃嚭馃嚫 Sunnyvale 27,809 n/a
29
eBayebay.com

This company creates pathways to connect millions of sellers and buyers globally, empowering customers to grow and thrive with innovative technology

Technology, Information and Internet 馃嚭馃嚫 San Jose 27,000 n/a
30
Experianexperianplc.com

Global information services company empowering consumers and clients to manage data confidently, make smarter decisions, prevent fraud, and maximize opportunities worldwide

Information Services 馃嚭馃嚫 Costa Mesa 26,255 1980
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.

Software Development 馃嚭馃嚫 Pleasanton 25,233 2005
32
Agilent Technologiesagilent.com

Innovative company providing advanced analytical, research, and diagnostic solutions for various industries worldwide, including healthcare, environmental safety, and energy solutions

Biotechnology Research 馃嚭馃嚫 Santa Clara 25,000 1999
33
University of California, Berkeleyberkeley.edu

Public research university offering diverse academic programs, fostering innovation, and serving as a flagship institution in California.

Higher Education 馃嚭馃嚫 Berkeley 24,082 1868
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

Higher Education 馃嚭馃嚫 Los Angeles 23,894 1880
35
Electronic Arts (EA)ea.com

Develops and publishes interactive entertainment and video games, fostering a global community with creativity and player engagement.

Entertainment Providers 馃嚭馃嚫 Redwood City 23,703 n/a
36
LinkedIncareers.linkedin.com

It connects professionals globally, offering services like Talent Solutions, Marketing Solutions, Sales Solutions, and Premium Subscriptions for productivity and success.

Software Development 馃嚭馃嚫 Sunnyvale 23,635 n/a
37
Sanminasanmina.com

A leading integrated manufacturing solutions provider offering end-to-end services to OEMs in various industries worldwide

Appliances, Electrical, and Electronics Manufacturing 馃嚭馃嚫 San Jose 22,931 1980
38
WDwesterndigital.com

This company creates innovative data storage solutions for current technology and future advancements

Computer Hardware Manufacturing 馃嚭馃嚫 San Jose 22,696 1970
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

Computer and Network Security 馃嚭馃嚫 Santa Clara 22,680 2005
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.

Higher Education 馃嚭馃嚫 Davis 21,439 1908
41
SpaceXspacex.com

A company specializing in designing, manufacturing, and launching advanced rockets and spacecraft with a goal of making life multiplanetary

Aviation and Aerospace Component Manufacturing 馃嚭馃嚫 Hawthorne 20,008 2002
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

Entertainment Providers 馃嚭馃嚫 Los Gatos 18,533 1997
43
Genentechgene.com

A cutting-edge science company passionate about finding innovative solutions for difficult-to-treat conditions, providing global access to life-changing medicines

Biotechnology Research 馃嚭馃嚫 South San Francisco 18,287 1976
44
Intuitintuit.com

A global technology platform helping customers overcome financial challenges, providing solutions like TurboTax, QuickBooks, Credit Karma, and Mailchimp

Software Development 馃嚭馃嚫 Mountain View 18,222 1983
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

Software Development 馃嚭馃嚫 San Jose 17,981 n/a
46
UCLA Healthuclahealth.org

Comprehensive healthcare system with top-ranked hospitals, advanced medical technology, expert physicians, and pioneering biomedical research across multiple specialties.

Hospitals and Health Care 馃嚭馃嚫 Los Angeles 17,812 1955
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

Manufacturing 馃嚭馃嚫 San Francisco 17,749 2000
48
Levi Strauss & Co.levistrauss.com

designs and markets iconic denim jeans and apparel brands, emphasizing sustainability, innovation, and global self-expression through fashion.

Retail Apparel and Fashion 馃嚭馃嚫 San Francisco 17,743 1853
49
Lam Researchlamresearch.com

Design and manufacture advanced equipment that enables semiconductor chipmakers to innovate and drive technological progress across various industries.

Semiconductor Manufacturing 馃嚭馃嚫 Fremont 17,202 1980

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50
KLAkla.com

Developing industry-leading equipment and services for the electronics industry, KLA provides advanced process control solutions for manufacturing various electronic components in collaboration with global customers

Semiconductor Manufacturing 馃嚭馃嚫 Milpitas 16,886 n/a
51
Cedars-Sinaicareers.cshs.org

Comprehensive healthcare provider excelling in patient care, pioneering research, advanced medical education, and community health improvement in Los Angeles.

Hospitals and Health Care 馃嚭馃嚫 Los Angeles 16,865 n/a
52
Seagate Technologyseagate.com

Leading provider of scalable mass-capacity data storage solutions, ensuring trust and integrity for innovations relying on vast data volumes.

Computer Hardware Manufacturing 馃嚭馃嚫 Fremont 16,700 1979
53
Fortinetfortinet.com

Fortinet enables trust in the digital world by protecting people, devices, and data for enterprises, service providers, and government organizations

Computer and Network Security 馃嚭馃嚫 Sunnyvale 16,304 2000
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

Retail 馃嚭馃嚫 Manhattan Beach 16,264 n/a
55
Stripestripe.com

Financial infrastructure platform enabling businesses to accept payments, increase revenue, and explore new opportunities to grow in San Francisco and Dublin

Technology, Information and Internet 馃嚭馃嚫 South San Francisco 16,031 2010
56
Databricksdatabricks.com

It provides a Data Intelligence Platform for organizations to manage their data effectively and leverage AI for better decision-making.

Software Development 馃嚭馃嚫 San Francisco 15,896 n/a
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.

Retail 馃嚭馃嚫 San Francisco 15,546 n/a
58
Autodeskautodesk.com

It provides software for architecture, engineering, construction, and media, enabling users to design, collaborate, and solve various challenges effectively.

Software Development 馃嚭馃嚫 San Francisco 15,378 1982
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.

Hospitals and Health Care 馃嚭馃嚫 Palo Alto 15,318 1885
60
Herbalifeherbalife.com

Global health and wellness company offering nutrition products, coaching support, and business opportunities to empower personal growth and community impact.

Wellness and Fitness Services 馃嚭馃嚫 Los Angeles 15,172 1980
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.

Motor Vehicle Manufacturing 馃嚭馃嚫 Torrance 15,103 n/a
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

Biotechnology Research 馃嚭馃嚫 Foster City 14,891 1987
63
Equinixequinix.com

A global digital infrastructure company empowering businesses to access foundational infrastructure, partners, and possibilities to accelerate advantage and multiply value

IT Services and IT Consulting 馃嚭馃嚫 Redwood City 14,710 1998
64
UC Irvineuci.edu

A top public research university in Southern California committed to rigorous academics, cutting-edge research, and leadership development with global impact

Higher Education 馃嚭馃嚫 Irvine 14,695 1965
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.

Medical Equipment Manufacturing 馃嚭馃嚫 Irvine 14,148 1958
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

Appliances, Electrical, and Electronics Manufacturing 馃嚭馃嚫 Santa Rosa 13,893 n/a
67
Pinterestpinterest.com

It is a visual inspiration platform with 482 million monthly active users, helping people search, save, and shop ideas.

Software Development 馃嚭馃嚫 San Francisco 13,766 2010
68
Intuitiveintuitive.com

A global technology leader in minimally invasive care and robotic-assisted surgery, utilizing intelligent technology to enhance patient outcomes without constraints

Medical Equipment Manufacturing 馃嚭馃嚫 California 13,240 1995
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

Entertainment Providers 馃嚭馃嚫 San Mateo 13,000 n/a
70
Symantecbroadcom.com

It offers comprehensive cybersecurity solutions for Endpoint, Network, Data, and Cloud security, catering to both individuals and enterprises.

Software Development 馃嚭馃嚫 San Jose 12,852 1982
71
NetAppnetapp.com

It builds intelligent data infrastructure, enabling applications to utilize any data from anywhere, enhancing data management and accessibility.

Software Development 馃嚭馃嚫 San Jose 12,680 1992
72
City of Hopecityofhope.org

Comprehensive cancer research, treatment, and innovation with a national network, focusing on breakthrough medicines and patient care integration.

Hospitals and Health Care 馃嚭馃嚫 Duarte 12,442 1913
73
Blockblock.xyz

Block is a company dedicated to economic empowerment, with diverse teams providing support in areas such as people, finance, legal, and security

Financial Services 馃嚭馃嚫 Oakland 12,038 n/a
74
Riviancareers.rivian.com

Innovative team dedicated to challenging conventional thinking and seeking new solutions to protect the outdoors for future generations

Motor Vehicle Manufacturing 馃嚭馃嚫 Irvine 11,979 2009
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

Semiconductor Manufacturing 馃嚭馃嚫 Santa Clara 11,815 1995
76
[24]7.ai247.ai

This company provides customer engagement solutions using conversational AI to create personalized, predictive, and effortless customer experiences across all channels

Software Development 馃嚭馃嚫 Campbell 11,656 2000
77
Cadencecadence.com

Development of software, hardware, and IP enabling innovative electronic product design across diverse markets like 5G, automotive, aerospace, and healthcare.

Software Development 馃嚭馃嚫 San Jose 11,424 1988
78
VMwarebroadcom.com

Leading provider of multi-cloud services enabling digital innovation with enterprise control Cultivating innovation to solve customer challenges with disruptive technologies

Software Development 馃嚭馃嚫 Palo Alto 11,230 n/a
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.

Defense and Space Manufacturing 馃嚭馃嚫 San Diego 11,213 n/a
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

Hospitals and Health Care 馃嚭馃嚫 San Diego 10,962 1966
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.

Medical Equipment Manufacturing 馃嚭馃嚫 Brea 10,628 1935
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

Higher Education 馃嚭馃嚫 Santa Barbara 10,619 n/a
83
Veeva Systemsveeva.com

Cloud-based software solutions for global life sciences industry, serving pharmaceutical companies and biotechs with innovation and customer success.

Software Development 馃嚭馃嚫 Pleasanton 10,036 2007
84
Robloxcareers.roblox.com

A platform where millions of creators build immersive virtual experiences for people to connect, learn, work, play, and socialize together

Software Development 馃嚭馃嚫 San Mateo 9,978 2004
85
Nutanixnutanix.com

Global leader in cloud software, providing a platform for running apps and data across clouds, simplifying operations for businesses worldwide

Software Development 馃嚭馃嚫 San Jose 9,917 n/a
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

Software Development 馃嚭馃嚫 San Diego 9,882 1979
87
Deeldeel.com

Platform offering HR tools, payroll, compliance, and mobility services to help companies manage and scale international workforces efficiently.

Human Resources Services 馃嚭馃嚫 San Francisco 9,873 2019
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

Higher Education 馃嚭馃嚫 Santa Cruz 9,767 1965
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

Biotechnology Research 馃嚭馃嚫 San Diego 9,673 1998
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.

Hospitals and Health Care 馃嚭馃嚫 Sacramento 9,647 1968
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.

Research Services 馃嚭馃嚫 Livermore 9,546 1952
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.

Biotechnology Research 馃嚭馃嚫 Hercules 9,416 1952
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.

Higher Education 馃嚭馃嚫 Palo Alto 9,384 n/a
94
Logitechlogitech.com

Innovative hardware and software solutions bringing people together in work, creation, gaming, and streaming, with a focus on sustainability

Computers and Electronics Manufacturing 馃嚭馃嚫 San Jose 9,325 1981
95
OpenAIopenai.com

An AI research and deployment company focused on creating safe and beneficial general-purpose artificial intelligence for the benefit of humanity

Research Services 馃嚭馃嚫 San Francisco 9,268 2015
96
ICU Medicalicumed.com

Specializes in safe, innovative IV therapy products, smart pumps, software, and consumables designed to improve patient care and safety.

Medical Equipment Manufacturing 馃嚭馃嚫 San Clemente 9,144 n/a
97
Juniper Networksjuniper.net

Develops intelligent, agile, and secure networking products and solutions serving global service providers, enterprises, and government organizations worldwide.

Software Development 馃嚭馃嚫 Sunnyvale 9,059 1996
98
Dexcomdexcom.com

A leader in continuous glucose monitoring technology, empowering individuals with diabetes to control their health and pursue their dreams

Medical Equipment Manufacturing 馃嚭馃嚫 San Diego 8,997 1999
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

Computer and Network Security 馃嚭馃嚫 San Jose 8,865 2007

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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.

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