The 42 largest companies in Hayward (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	California State University - East Bay csueastbay.edu High-access public university in the San Francisco East Bay Area offering diverse fields of study, award-winning curriculum, and expert faculty	Higher Education	🇺🇸 Hayward	3,372	n/a
2	Ultra Clean Technology uct.com Global leader in semiconductor fabrication support, offering advanced manufacturing, tool cleaning, coating, and micro-contamination analysis services.	Semiconductor Manufacturing	🇺🇸 Hayward	2,769	1991
3	Chabot College chabotcollege.edu Governed by a seven-member board of trustees making policy decisions for nine communities, elected by registered voters from trustee areas.	Higher Education	🇺🇸 Hayward	922	1961
4	Hayward Unified School District husd.us The organization empowers students to become leaders by providing educational excellence through a diverse range of schools and programs	Primary and Secondary Education	🇺🇸 Hayward	887	n/a
5	Tamarack Health tamarackhealth.org Providing excellent care throughout life, including hospital, clinics, long term care, and housing options, to support independence and healing	Hospitals and Health Care	🇺🇸 Hayward	821	n/a
6	Mygrant Glass Company mygrantglassonline.com An auto glass distributor based in Hayward, CA, offering a wide range of high-quality OEM and generic glass from 30+ factories worldwide	Glass, Ceramics and Concrete Manufacturing	🇺🇸 Hayward	681	1926
7	Arcus Biosciences arcusbio.com A rapidly growing biopharmaceutical company in San Francisco developing cancer treatments with a focus on combination therapies and stock options for employees	Biotechnology Research	🇺🇸 Hayward	644	2015
8	La Familia livelafamilia.org Non-profit organization dedicated to enhancing emotional wellness and supporting families in the Latino community through counseling services and community programs	Non-profit Organizations	🇺🇸 Hayward	583	1975
9	Keeco, LLC keecohome.com A leading supplier of home textiles, offering fashionable bedding, soft window treatments, bath, kitchen, and patio products to retailers in North America	Textile Manufacturing	🇺🇸 Hayward	526	1976
10	City of Hayward hayward-ca.gov The company operates as a Charter City with a diverse population, a range of transport facilities, and a focus on business partnerships and community success	Government Administration	🇺🇸 Hayward	525	1876
11	Eden Housing, Inc.edenhousing.org A non-profit organization with 55 years of experience providing safe, affordable housing in California, focusing on environmental sustainability and housing policy advocacy	Real Estate	🇺🇸 Hayward	465	1968
12	Pentagon Technologies pen-tec.com Provider of manufacturing support services, contamination detection, and protection products for high-tech industries Improving equipment efficiency and lifecycle for optimal production	Semiconductor Manufacturing	🇺🇸 Hayward	462	1998
13	Alameda County Office of Education acoe.org A county office of education supports marginalized youth through direct education, services for at-risk students, and collaboration with agencies	Education Administration Programs	🇺🇸 Hayward	439	n/a
14	Plastikon Industries Inc plastikon.com A world-leading plastic and contract manufacturer servicing various industries with award-winning services, global facilities, Toyota principles, and MBE certification	Plastics Manufacturing	🇺🇸 Hayward	377	n/a
15	Impax Laboratories amneal.com Combined company focusing on generics, branded medicines, and biosimilars to improve healthcare accessibility, affordability, and address medical needs.	Pharmaceutical Manufacturing	🇺🇸 Hayward	349	1999
16	Life Chiropractic College West lifewest.edu The company provides chiropractic education in various techniques, emphasizing science, technique, philosophy, and business skills, located in the San Francisco Bay Area	Higher Education	🇺🇸 Hayward	333	n/a
17	Truepill rx.fuzehealth.com Truepill offers innovative B2B pharmacy solutions like Virtual Pharmacy, Patient Services, and Prescription Fulfillment to improve access to healthcare and patient outcomes	Hospitals and Health Care	🇺🇸 Hayward	330	2016
18	Magnus Technology Solutions magnustechnol.com A leading services firm offering consulting, outsourcing, and staffing services to Fortune 500 Companies for managing various business processes	Staffing and Recruiting	🇺🇸 Hayward	302	2011
19	C-Hawk Technology Int'l c-hawk.com This company specializes in manufacturing plastic components and module assembly for various industries, with a focus on advanced technology and global presence	Plastics Manufacturing	🇺🇸 Hayward	233	2006
20	Hayward Area Recreation and Park District haywardrec.org An independent special use district providing park and recreation services for over 280,000 residents in a 100 square-mile area	Recreational Facilities	🇺🇸 Hayward	176	1944
21	Quickly Corporation quicklyusa.com A global tapioca milk tea franchise offering Asian fusion-style cafes with options like frozen yogurt and Hong Kong style egg puffs	Food and Beverage Services	🇺🇸 Hayward	175	2003
22	Melrose Nameplate & Label Co., Inc.melrose-nl.com American manufacturer providing custom industrial nameplates, labels, graphic overlays, and human-machine interaction solutions, including touchscreens, displays, and keypads, for diverse industries.	Appliances, Electrical, and Electronics Manufacturing	🇺🇸 Hayward	164	1939
23	Aperia Technologies aperiatech.com Innovative company specializing in tire management solutions for commercial fleets worldwide, improving fuel economy, road safety, and reducing maintenance costs	Mechanical Or Industrial Engineering	🇺🇸 Hayward	162	2010
24	RefleXion Medical reflexion.com Biology-guided radiotherapy company using SCINTIX® therapy to detect and treat tumors in the lung or bone through cancer-emitted signals	Medical Equipment Manufacturing	🇺🇸 Hayward	157	2009
25	NOR-CAL Moving Services nor-calmoving.com A reputable moving and storage company in the San Francisco Bay Area, offering a full suite of relocation services locally, nationally, and internationally	Truck Transportation	🇺🇸 Hayward	154	1982
26	Maleko Personnel malekopersonnel.com Providing personalized staffing solutions for individuals and companies, focused on building lasting relationships and exceeding expectations for a strategic partnership in employment	Staffing and Recruiting	🇺🇸 Hayward	146	2007
27	Ripcord ripcord.com Disrupting document intelligence space, digitizing, ingesting, classifying, extracting, abstracting data from paper and digital records, making them accessible and actionable to enterprise users	Technology, Information and Internet	🇺🇸 Hayward	140	2015
28	Pacific Equipment Solutions pmhsi.com Specializing in material handling products, warehouse equipment, commercial trucks, and fleet management Offering a range of products, services, leasing, and industry-leading fleet management reporting	Machinery Manufacturing	🇺🇸 Hayward	120	1993
29	Jupiter Systems jupiter.com Innovative enterprise collaboration solutions, data visualization in various spaces, seamless sharing and collaboration worldwide 24/7, 365 days a year	Computers and Electronics Manufacturing	🇺🇸 Hayward	84	1981
30	Tuopu USA tuopu.com A technology-leading automobile parts company specializing in power chassis systems, interior and exterior systems, and intelligent driving control with a focus on quality and service	Motor Vehicle Manufacturing	🇺🇸 Hayward	56	1983
31	Pharmatech Associates, a USP company pharmatechassociates.com Advises drug sponsors and manufacturers on quality medicines, product development, regulatory navigation, and quality management systems across life sciences.	Pharmaceutical Manufacturing	🇺🇸 Hayward	52	1995
32	Delphon delphon.com Delphon invests in companies developing advanced polymer, adhesive, and print-on-product technologies for high-tech industries like semiconductor, medical, and electronics	Semiconductor Manufacturing	🇺🇸 Hayward	46	1980
33	Lygos lygos.com Innovative company using advanced technologies to create sustainable specialty chemicals and solutions for global sustainability challenges	Chemical Manufacturing	🇺🇸 Hayward	29	2011
34	Spectrum Label Corporation spectrumlabel.com A leading provider of high quality labels and flexible packaging for various industries, known for award-winning printing and commitment to excellence	Packaging and Containers Manufacturing	🇺🇸 Hayward	19	1968
35	Abstract Softweb abstractsoftweb.com An offshore IT provider offering web development, software engineering, digital marketing, and outsourcing services to global clients, with expertise in various technologies	IT Services and IT Consulting	🇺🇸 Hayward	9	2010
36	Heritage Fund Realty and Investments heritagefundrealty.com A full-service financial firm offering real estate brokerage, property management, mortgages, insurance, financial planning, credit repair, and consulting services	Real Estate	🇺🇸 Hayward	7	2008
37	Hytes IT hytesit.com A leading software consultancy specializing in end-to-end development solutions for digital transformation across various industries worldwide	IT Services and IT Consulting	🇺🇸 Hayward	7	n/a
38	POSSMEI USA INC possmei.com A bubble tea material supply company based in Taiwan with branch offices in California, Texas, and Germany, established in 2008	Wholesale Food and Beverage	🇺🇸 Hayward	6	n/a
39	Primo Industrial Inc An automotive company based in Hayward, California, specializing in industrial products	Motor Vehicle Manufacturing	🇺🇸 Hayward	5	n/a
40	Halio North America halioglass.com A joint venture offering advanced electrochromic glass solutions for energy savings, natural light management, and meeting sustainability goals in building industry	Wholesale Building Materials	🇺🇸 Hayward	5	n/a
41	SpanCore Inc.spancore.com An IT consulting services company in Silicon Valley offering innovative solutions in digital experience delivery, system integration, data analysis, software quality assurance, and more	IT Services and IT Consulting	🇺🇸 Hayward	3	n/a
42	Axis Energy, Inc.axisenergy.com Provider of innovative and sustainable clean energy solutions for residential and commercial buildings, offering engineering, procurement, construction, operations, and maintenance services	Construction	🇺🇸 Hayward	2	2021

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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 Oct 24, 2026.

The same list elsewhere in United States

The largest companies in the United States 91,669
The largest companies in California 12,813
The largest companies in New York State 10,485
The largest companies in Texas 8,086
The largest companies in Florida 4,945
The largest companies in Illinois 4,175
The largest companies in Pennsylvania 3,110
The largest companies in Massachusetts 3,093
The largest companies in Georgia 2,632
The largest companies in Ohio 2,618
The largest companies in New Jersey 2,569
The largest companies in Virginia 2,503
The largest companies in Michigan 2,346
The largest companies in North Carolina 2,174
The largest companies in Alabama 1,806
The largest companies in Washington State 1,785
The largest companies in Colorado 1,774
The largest companies in Minnesota 1,700
The largest companies in Maryland 1,527
The largest companies in Wisconsin 1,482
The largest companies in New York 6,920
The largest companies in San Francisco 2,030
The largest companies in Houston 1,791
The largest companies in Chicago 1,668