The 100 largest companies in Oakland (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	University of California jobs.universityofcalifornia.edu Educating top minds, advancing research, engaging communities, supporting economy, improving health, protecting environment, and driving innovation across California.	Higher Education	🇺🇸 Oakland	152,503	n/a
2	Kaiser Permanente healthy.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	🇺🇸 Oakland	137,397	1945
3	Pacific Gas and Electric Company pge.com Transmission and delivery of natural gas and electricity to approximately 15 million customers across a large service area in California.	Utilities	🇺🇸 Oakland	23,550	n/a
4	Block block.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	🇺🇸 Oakland	12,038	n/a
5	The Clorox Company thecloroxcompany.com Manufactures and markets trusted household and personal care brands focused on health, wellness, and sustainability leadership since 1913.	Manufacturing	🇺🇸 Oakland	8,131	1913
6	Blue Shield of California blueshieldca.com Nonprofit health plan offering medical, dental, vision, Medicaid, and Medicare services to nearly six million members in California.	Insurance	🇺🇸 Oakland	7,973	1939
7	Outlier AI outlier.ai Outlier improves the relationship between people and their data, focusing on enhancing decision-making and promoting success in business and life	Software Development	🇺🇸 Oakland	6,295	2015
8	Alameda County acgov.org Provides essential health, social, public protection, and government services to diverse communities across multiple cities and rural areas.	Government Administration	🇺🇸 Oakland	5,286	n/a
9	Oakland Unified School District ousd.org A school district in Oakland focused on academic achievement, equity, and providing excellent teachers to ensure all students reach their highest potential	Education Administration Programs	🇺🇸 Oakland	4,348	n/a
10	UCSF Benioff Children's Hospitals ucsfbenioffchildrens.org A top-rated children's hospital with campuses in Oakland and San Francisco, providing care and support to families in Northern California	Hospitals and Health Care	🇺🇸 Oakland	2,850	n/a
11	BART bart.gov A public transit system connecting the San Francisco Peninsula with East Bay and South Bay communities, providing safe, reliable transportation for residents and visitors	Rail Transportation	🇺🇸 Oakland	2,706	1957
12	City of Oakland oaklandca.gov Local government managing urban development, community resources, and natural landscapes in a populous coastal city with diverse opportunities.	Government Administration	🇺🇸 Oakland	2,539	1852
13	Heatflask heatflask.com An app created by a single person to showcase recorded activities in a fun and insightful way, despite false claims of employment	Information Services	🇺🇸 Oakland	1,950	2016
14	Credit Karma creditkarma.com provides free credit scores, identity monitoring, credit card applications, insurance, loans, and banking services to millions globally	Consumer Services	🇺🇸 Oakland	1,887	2007
15	Fivetran fivetran.com Centralizes data from SaaS applications and databases into cloud destinations for AI, ML, analytics, and operational workloads.	Software Development	🇺🇸 Oakland	1,868	2012
16	University of California Office of the President ucop.edu Managing fiscal and business operations, supporting academic research missions, and promoting system-wide interests in higher education through policy and advocacy	Education Administration Programs	🇺🇸 Oakland	1,850	n/a
17	Radio Shack radioshack.com Retail store offering tablets, phones, audio accessories, Bluetooth devices, DIY components, and more with no-contract options	Retail	🇺🇸 Oakland	1,788	n/a
18	E.L.F. BEAUTY elfbeauty.com A beauty company committed to inclusive, accessible, cruelty-free beauty products, expanding its portfolio with brands that support their purpose and values	Personal Care Product Manufacturing	🇺🇸 Oakland	1,769	2004
19	Public Health Institute phi.org A nonprofit organization dedicated to promoting health and well-being through research and innovations in public health on a national and international scale	Non-profit Organizations	🇺🇸 Oakland	1,646	1964
20	Pandora careers.siriusxm.com A leading ad-supported audio entertainment streaming service offering personalized music and podcast experiences through proprietary technology, available on various platforms	Software Development	🇺🇸 Oakland	1,522	2000
21	EBMUD ebmud.com A California public utility providing high-quality drinking water, renewable energy generation, and wastewater treatment services to protect San Francisco Bay	Utilities	🇺🇸 Oakland	1,498	1923
22	Sierra Club sierraclub.org A company committed to environmental, racial, economic, and gender justice, advocating for a healthy climate, nature connection, and democracy	Non-profit Organizations	🇺🇸 Oakland	1,366	1892
23	Seneca Family of Agencies senecafoa.org A nonprofit organization offering mental health, education, and juvenile justice services to over 18,000 youth and families in California and Washington State	Mental Health Care	🇺🇸 Oakland	1,313	1985
24	Aspire Public Schools aspirepublicschools.org A network of 36 community-based schools in California serving over 15,000 students, focused on preparing students for success in college and beyond	Primary and Secondary Education	🇺🇸 Oakland	1,279	1998
25	AC Transit actransit.org provides safe, convenient, courteous, and reliable bus transit services across 13 cities and nearby areas in East Bay.	Urban Transit Services	🇺🇸 Oakland	1,200	1960
26	Samuel Merritt University samuelmerritt.edu Established in 1909, this organization provides top-notch health care education in nursing, occupational therapy, physical therapy, physician assistant, and podiatric medicine	Higher Education	🇺🇸 Oakland	1,122	1909
27	ThredUp thredup.com Managed marketplace for secondhand apparel, shoes and accessories providing resale technology services for brands while offering sustainable shopping experiences through large-data-driven processing infrastructure and software.	Retail Apparel and Fashion	🇺🇸 Oakland	1,110	2009
28	Blue Bottle Coffee bluebottlecoffee.com A dedicated team sources, roasts, and prepares delicious coffee ethically, fostering strong community connections from farm to cup	Food and Beverage Services	🇺🇸 Oakland	1,083	n/a
29	Iksula iksula.com A global provider of eCommerce solutions with expertise in merchandising, technology, software engineering, and specialized products for brands and retailers	Technology, Information and Internet	🇺🇸 Oakland	1,059	2007
30	Marqeta marqeta.com A modern card issuing platform in Oakland, CA revolutionizing financial solutions for consumers and empowering employees to make an impact	Financial Services	🇺🇸 Oakland	1,022	2010
31	Turnitin turnitin.com Global education integrity company partnering with institutions to promote honesty, consistency, and fairness through various assessment tools and services	Software Development	🇺🇸 Oakland	986	1996
32	Reading Partners readingpartners.org This organization recruits and trains volunteers to provide one-on-one reading instruction to elementary school students below grade level, promoting academic success	Education Administration Programs	🇺🇸 Oakland	922	2001
33	California Department of Industrial Relations dir.ca.gov The company aims to enhance workplace conditions, enforce labor laws in California, and ensure safety, health, and benefits for workers	Government Administration	🇺🇸 Oakland	902	1927
34	Philz Coffee philzcoffee.com Passionate San Francisco-based coffee company prioritizing customer experience, quality, kindness, and authenticity in a fun, creative, and vibrant workplace environment	Retail	🇺🇸 Oakland	852	2003
35	La Clínica de La Raza laclinica.org Providing culturally appropriate, high-quality primary healthcare and wellness services across multiple sites to diverse populations in California.	Hospitals and Health Care	🇺🇸 Oakland	836	1971
36	BKF Engineers bkf.com A California-based engineering firm offering services in engineering, surveying, and land planning for various industries and projects for over 100 years	Civil Engineering	🇺🇸 Oakland	777	1915
37	GRID Alternatives gridalternatives.org A non-profit organization promoting accessibility to renewable energy technology and job training in underserved communities for a successful energy transition	Services for Renewable Energy	🇺🇸 Oakland	774	2001
38	Energy Solutions energy-solution.com A mission-led, employee-owned firm combating climate change through market-based energy and carbon management solutions for clients across North America	Services for Renewable Energy	🇺🇸 Oakland	762	1995
39	East Bay Regional Park District ebparks.org This company manages a system of parks and open spaces in Alameda and Contra Costa counties with over 121,000 acres and 1,200 miles of trails for recreational activities	Government Administration	🇺🇸 Oakland	752	1934
40	Playworks playworks.org Promoting social and emotional skills through safe and fun play at schools, reaching over 700,000 students across 1,200 schools nationwide	Non-profit Organizations	🇺🇸 Oakland	700	1996
41	Kadiant kadiant.com Dedicated to providing top-quality ABA therapy and critical services for individuals with ASD, with a mission to empower people to live their best lives	Mental Health Care	🇺🇸 Oakland	697	2019
42	Great Place To Work greatplacetowork.com global workplace culture authority providing surveys, data-driven insights, certification, and benchmarking to improve trust and business results worldwide	Business Consulting and Services	🇺🇸 Oakland	675	1992
43	College Track collegetrack.org A college completion program supporting first-generation students from low-income communities to earn bachelor's degrees and achieve upward social mobility	Non-profit Organizations	🇺🇸 Oakland	649	1997
44	KPI Partners kpipartners.com Global provider of data science, AI/ML, cloud databases, and analytics solutions supporting diverse industries with scalable digital transformation services.	IT Services and IT Consulting	🇺🇸 Oakland	644	2006
45	LaunchDarkly launchdarkly.com Leader in feature management, offering scalable platform for gradual software releases to accelerate innovation and collaboration for DevOps teams Founded in 2014	Software Development	🇺🇸 Oakland	640	2014
46	Topcon Healthcare topconhealthcare.com Empowering eye care providers with smart technologies for enhanced patient care through integrated solutions including advanced imaging, data management, and remote diagnostics.	Medical Equipment Manufacturing	🇺🇸 Oakland	611	n/a
47	KIPP Public Schools Northern California kippnorcal.org A network of free charter schools in Northern California providing education to elementary, middle, and high school students	Primary and Secondary Education	🇺🇸 Oakland	545	2002
48	Ring Container Technologies ringcontainer.com Industry leader in PET and HDPE plastic packaging, creating durable, practical containers through innovation and collaboration with customers for superior consumer product packaging	Plastics Manufacturing	🇺🇸 Oakland	544	1968
49	Everlaw everlaw.com Empowering legal teams with advanced ediscovery technology for faster, more secure investigations and presentations, transforming the way they uncover the truth	Software Development	🇺🇸 Oakland	538	2010
50	Kuli Kuli Foods kulikulifoods.com A mission-driven company sustainably sources and produces superfood products from the moringa tree to empower women and fight climate change globally	Food and Beverage Services	🇺🇸 Oakland	513	2011
51	Mettler-Toledo Rainin mt.com Leading provider of advanced pipetting solutions for life scientists worldwide, offering manual and electronic pipettes, tips, and expert services with innovative design and superior quality	Biotechnology Research	🇺🇸 Oakland	509	1963
52	Peralta Community College District peralta.edu A collaborative community of colleges in Oakland, Calif offering accessible educational programs and services to over 35,000 students	Higher Education	🇺🇸 Oakland	494	1964
53	Mynd mynd.co Streamlined real estate investing platform with $35B+ assets under management in 25+ US markets Simplifying managing, buying, selling, financing, and insuring properties	Real Estate	🇺🇸 Oakland	480	2016
54	Port of Oakland portofoakland.com Management of airport, seaport, and real estate facilities to support tenants, create jobs, and generate economic growth in Oakland.	Maritime Transportation	🇺🇸 Oakland	480	1927
55	St. Theresa School sttheresaschool.org A K-8, coeducational Catholic school in Oakland's Upper Rockridge district, focused on inspiring students to live the Gospel and excel academically	Primary and Secondary Education	🇺🇸 Oakland	476	1958
56	BOOK/SHOP book---shop.com Design company located in Oakland, California Specializing in creating unique and innovative designs for various products and industries	Design Services	🇺🇸 Oakland	459	n/a
57	Superior Court of California, County of Alameda alameda.courts.ca.gov The Superior Court of California, County of Alameda serves over 16 million residents with 9 locations and over 600 staff members in various roles	Administration of Justice	🇺🇸 Oakland	458	n/a
58	Caltrans - California Department of Transportation A government administration company based in Oakland, California, responsible for overseeing transportation infrastructure and projects throughout the state	Government Administration	🇺🇸 Oakland	455	n/a
59	Mills College mills.northeastern.edu A historic liberal arts college with a focus on diversity, innovation, and academic success, producing notable alumni in various fields	Higher Education	🇺🇸 Oakland	448	1852
60	OLIPOP PBC drinkolipop.com A health-focused beverage company founded in 2017, offering a delicious tonic with prebiotics and natural plant fiber to support digestive health	Food and Beverage Services	🇺🇸 Oakland	441	2018
61	Alameda County Sheriff's Office alamedasheriff.gov Law enforcement agency dedicated to recruiting and retaining top personnel, promoting teamwork and professional development, and providing excellent service to the community	Law Enforcement	🇺🇸 Oakland	431	1853
62	Landmark Event Staffing Services Inc aus.com A leading event staffing company specializing in crowd management, security, guest services, and risk management for major events nationwide	Entertainment Providers	🇺🇸 Oakland	426	2006
63	DASAN Zhone Solutions dasanzhone.com Global leader in network access solutions for service provider and enterprise networks, offering broadband access, Ethernet switching, Passive Optical LAN, and software-defined networks worldwide	Telecommunications	🇺🇸 Oakland	420	1999
64	SEIU UHW seiu-uhw.org A major union representing over 95,000 hospital workers in the western US, SEIU-UHW focuses on advocating for healthcare employees	Civic and Social Organizations	🇺🇸 Oakland	413	n/a
65	Bay Area Community Services (BACS)bayareacs.org Breaking barriers in mental health, housing, and community support by offering comprehensive programs for individuals facing various challenges like substance use, trauma, and poverty	Non-profit Organizations	🇺🇸 Oakland	408	1953
66	Asian Health Services asianhealthservices.org Healthcare organization providing comprehensive services in multiple languages, including medical, dental, mental health, nutrition, and advocacy for diverse communities regardless of status	Medical Practices	🇺🇸 Oakland	402	1974
67	Acrobat Outsourcing theservicecompanies.com Nationwide provider of trained food & beverage professionals, offering high-quality staffing solutions for hospitality businesses Focus on running your business, we handle the rest	Hospitality	🇺🇸 Oakland	389	2005
68	First United Bank & Trust mybank.com Community bank offering personalized financial solutions for individuals and businesses in Maryland, West Virginia, and Pennsylvania, with over one billion dollars in assets	Banking	🇺🇸 Oakland	386	1900
69	KIPP Bay Area Public Schools kippbayarea.org A non-profit network of charter schools in the Bay Area preparing educationally underserved students for college and success in life	Non-profit Organizations	🇺🇸 Oakland	378	2002
70	Earnest earnest.com A company empowering students to achieve financial success through education tools, lending products, and a remote-first culture, guided by core values and competitive incentives	Financial Services	🇺🇸 Oakland	371	2013
71	Merritt College merritt.edu Educational institution offering affordable quality education for students of all ages and backgrounds, including degree programs, job skill updates, and personal enrichment classes	Higher Education	🇺🇸 Oakland	369	1953
72	Good Eggs goodeggs.com The company focuses on providing responsibly-sourced, fresh, high quality food products through direct connections with trusted growers and producers	Food and Beverage Services	🇺🇸 Oakland	368	2011
73	YMCA of the East Bay ymcaeastbay.org Serves children, teens, and adults in Alameda and Contra Costa Counties with early childhood education, after-school programs, and fitness branches.	Non-profit Organizations	🇺🇸 Oakland	367	1879
74	Specialized Packaging Group spgpackaging.com Specialized Packaging Group is a leading manufacturer of protective, engineered, and specialty packaging products in the US, Canada, and Mexico	Packaging and Containers Manufacturing	🇺🇸 Oakland	345	2004
75	Oakland Zoo oaklandzoo.org A non-profit zoo dedicated to wildlife conservation, housing over 700 animals and featuring a state-of-the-art veterinary hospital and California Trail exhibit	Museums, Historical Sites, and Zoos	🇺🇸 Oakland	331	1922
76	Fred Finch Youth & Family Services linktr.ee A leading organization providing comprehensive services to youth and families facing challenges such as foster care, mental health, developmental disabilities, and trauma	Non-profit Organizations	🇺🇸 Oakland	329	1891
77	IAC Publishing iacpublishing.com A digital publisher with trusted brands reaching over 100 million US users monthly, offering unique advertising opportunities to engage diverse demographics	Technology, Information and Internet	🇺🇸 Oakland	328	n/a
78	ALR alrinc.com Northern California agency representing lighting and controls manufacturers with a focus on exceptional customer service and integrity Serving regions in California, Nevada, Oregon, and Washington	Architecture and Planning	🇺🇸 Oakland	317	n/a
79	Center for Elders' Independence cei.elders.org The company provides comprehensive medical and social care services for East Bay seniors over 55, allowing them to live at home	Hospitals and Health Care	🇺🇸 Oakland	315	1991
80	Teleport goteleport.com Modernizing identity, access, and policy management for infrastructure to enhance engineering speed and improve security against human errors and breaches.	Software Development	🇺🇸 Oakland	314	2015
81	Galileo Learning galileo-camps.com Innovative summer camp programs inspire kids to explore, fail, and grow fearlessly, fostering creativity, confidence, and a new generation of innovators	Education Administration Programs	🇺🇸 Oakland	311	2001
82	GSC gogsc.com A nationwide logistics company offering customized solutions to retailers, manufacturers, and distributors with expertise in drayage, transloading, warehousing, and brokerage services	Transportation, Logistics, Supply Chain and Storage	🇺🇸 Oakland	295	1988
83	Summer Search summersearch.org Summer Search empowers high school students from low-income communities to overcome systemic inequities through mentoring and transformative experiences, leading to higher graduation rates and future leadership roles	Non-profit Organizations	🇺🇸 Oakland	295	1990
84	SMASH smash.org SMASH provides STEM-focused education and career readiness resources to students of color, helping to build a diverse and socially conscious tech workforce	Education Administration Programs	🇺🇸 Oakland	295	2001
85	SVS Group svsjobs.com A staffing agency with knowledgeable consultants who provide top professionals to elite companies, focusing on complete project management and client satisfaction	Staffing and Recruiting	🇺🇸 Oakland	274	1996
86	Education for Change Public Schools efcps.org Provides high-quality education to underserved children in Oakland through a network of charter schools focusing on academic achievement and student success	Education Administration Programs	🇺🇸 Oakland	267	2005
87	Fair Trade USA fairtradecertified.org Leading certifier of fair trade products, offering sustainable sourcing certification programs to improve livelihoods, protect the environment, and build transparent supply chains globally	International Trade and Development	🇺🇸 Oakland	259	1998
88	Topcon Medical Systems topconhealthcare.com Innovative developer and supplier of advanced diagnostic equipment for the ophthalmic community, offering a wide range of precision instruments and dedicated service	Medical Equipment Manufacturing	🇺🇸 Oakland	250	n/a
89	Mathematics, Engineering, Science Achievement (MESA) program mesa.ucop.edu Non-profit organization preparing disadvantaged students for success in STEM fields through education and resources, administered by UC Office of the President	Higher Education	🇺🇸 Oakland	244	1970
90	Rise Up Together riseuptogether.org Empowering women, girls, and allies globally to drive transformation by providing training and support for advocacy in education, health, and economic opportunity	Non-profit Organizations	🇺🇸 Oakland	241	2009
91	Alameda County District Attorney's Office da.alamedacountyca.gov The company reviews and prosecutes criminal violations, protects consumers and the environment, and supports crime victims in California	Legal Services	🇺🇸 Oakland	229	n/a
92	Deem, Inc.deem.com Provides intuitive, secure solutions for business travel booking and expense management, enabling companies to control costs and employees to make productive travel decisions.	Software Development	🇺🇸 Oakland	227	1999
93	Altais altais.com Altais is a multi-specialty physician group focused on delivering value-based care, innovative solutions, and quality services to thousands of patients	Hospitals and Health Care	🇺🇸 Oakland	222	2019
94	Lincoln Families lincolnfamilies.org Lincoln disrupts cycles of poverty and trauma by providing education, family support, and well-being services to empower children and families	Non-profit Organizations	🇺🇸 Oakland	216	1883
95	Red Oak Realty redoakrealty.com Leading independent real estate broker in San Francisco East Bay, helping clients buy and sell homes with a team of experts focused on successful transactions and client support	Real Estate	🇺🇸 Oakland	213	1976
96	Code for America codeforamerica.org Diverse team of problem solvers merging technology, nonprofit, and government to create digital tools and transform government for all	Civic and Social Organizations	🇺🇸 Oakland	213	2009
97	Renew Home renewhome.com The company partners across the energy industry to help customers save energy and money at home, revolutionizing the way we power the world	Energy Technology	🇺🇸 Oakland	203	n/a
98	Lighthouse Community Public Schools lighthousecharter.org A network of high-achieving public charter schools in East Oakland, preparing diverse students for college and empowering them to become lifelong changemakers	Primary and Secondary Education	🇺🇸 Oakland	202	2002
99	Lilac lilacsolutions.com A lithium extraction company located in Oakland, California, specializing in innovative solutions for lithium production	Mining	🇺🇸 Oakland	202	2016
100	WestCoast Children's Clinic westcoastcc.org A non-profit organization providing psychological services to vulnerable children, youth, and families, including therapy, assessments, and training programs for mental health professionals	Mental Health Care	🇺🇸 Oakland	199	1979

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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 Oct 9, 2026.

The 100 largest companies in Oakland

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