This selection of large chemical companies in California shows a mix of manufacturing and biotechnology research firms. Companies like The Clorox Company, founded in 1913, specialize in household and personal care brands, while Behr Paint Company, established in 1947, manufactures paints and primers. Kyocera International, Inc. provides high-tech products, and Amyris, founded in 2003, focuses on biomanufacturing for flavors and fragrances. Dunn-Edwards Corporation produces architectural coatings, and WD-40 Company markets maintenance and homecare products.
The headquarters are distributed across various cities, with a notable presence in Southern California, including Santa Ana, San Diego, and Los Angeles. There is also a cluster of older, established companies founded in the early to mid-20th century, alongside more recent biotechnology firms.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
The Clorox Companythecloroxcompany.com
Manufactures and markets trusted household and personal care brands focused on health, wellness, and sustainability leadership since 1913. |
8,131 | |||
| 2 |
Behr Paint Companyjobs.masco.com
Manufactures paints, primers, stains, decorative finishes, and application products for DIYers, designers, and professional paint contractors in North America. |
2,819 | |||
| 3 |
Kemin Industrieskemin.com
Global manufacturer providing over 500 specialty ingredients for diverse industries including human health, animal feed, pet food, and crop technologies, improving quality of life. |
2,221 | |||
| 4 |
Boydboydcorp.com
The company specializes in designing and manufacturing advanced engineered materials and thermal management solutions for various industries, promoting innovation and empowerment |
1,858 | |||
| 5 |
Kyocera International, Inc. (North America)americas.kyocera.com
A leading provider of high-tech products for consumers and businesses including fine ceramics, semiconductor components, communication equipment, consumer products, and more |
1,553 | |||
| 6 |
CalPortlandcalportland.com
A leading provider of building materials and construction solutions in the Western US and Canada, focusing on sustainability and renewable technologies |
1,300 | |||
| 7 |
Dunn-Edwards Corporationdunnedwards.com
A leading manufacturer in the Southwest, providing architectural and industrial coatings, paints, and painting supplies to professionals and quality-conscious consumers since 1925 |
1,270 | |||
| 8 |
Teichertteichert.com
A company founded in 1887 that provides construction services, infrastructure building, and construction materials while prioritizing environmental sustainability and community partnerships |
1,128 | |||
| 9 |
Amyrisamyris.com
vertically integrated biomanufacturing company, specialty molecules for flavors, fragrances, materials, beauty, personal care, food, enhancing lives, protecting ecosystems |
989 | |||
| 10 |
WD-40 Companywd40company.com
Global company marketing and distributing high-quality maintenance and homecare products across diverse trade channels in over 176 countries worldwide. |
955 | |||
| 11 |
Auto-Chlor Systemautochlor.com
A trusted leader in quality cleaning solutions for various industries, including restaurants, bars, hospitality, and healthcare, with a focus on sustainability |
863 | |||
| 12 |
MP Biomedicalsmpbio.com
Manufacture and supply over 55,000 life science, fine chemical, and diagnostic products with global distribution and quality certifications. |
677 | |||
| 13 |
Phenomenexphenomenex.com
A global technology leader developing innovative analytical chemistry solutions for researchers in various industries, accelerating science and improving global health and well-being |
668 | |||
| 14 |
JM Eaglejmeagle.com
A leading manufacturer of high-grade PVC and HDPE pipes for various industries worldwide, committed to innovation, superior customer service, and environmental sustainability |
644 | |||
| 15 |
Ferrotecferrotec.com
Global leader in advanced technology solutions, manufacturing materials, components, and assembly solutions for various industries worldwide Headquartered in Tokyo, Japan |
636 | |||
| 16 |
Custom Building Productscustombuildingproducts.com
Leader in flooring preparation products and tile installation systems for residential and commercial projects, offering popular and trusted brands to industry professionals |
616 | |||
| 17 | 590 | ||||
| 18 |
IPS Corporationipscorp.com
Manufacturer of professional-grade solvent cements, sealants, adhesives, and plumbing products for industrial and commercial use, providing reliable solutions for contractors and fabricators |
549 | |||
| 19 |
Carboncarbon3d.com
Rapidly design, develop, and scale production of better products using integrated materials, software, and 3D printers, accelerating market delivery. |
522 | |||
| 20 |
MOMENTIVE PERFORMANCE MATERIALS
A California-based chemicals company specializing in performance materials, serving various industries with innovative solutions and high-quality products |
515 | |||
| 21 |
AMPAC Fine Chemicalsampacfinechemicals.com
United States-based custom manufacturer of active pharmaceutical ingredients and registered intermediates, solving problems through technology to deliver quality products for saving and improving lives. |
466 | |||
| 22 |
Toray Advanced Compositestoraytac.com
Develops and manufactures advanced composite material solutions for aerospace, satellite, communications, and industrial markets, offering world-class products and technical support. |
464 | |||
| 23 |
Garratt-Callahan Companygarrattcallahan.com
Provider of industrial water treatment solutions including boiler, cooling, and wastewater treatment, with a focus on system optimization and water safety training |
463 | |||
| 24 | 452 | ||||
| 25 |
Sila Nanotechnologies, Inc.silanano.com
This company engineers next-gen battery materials to increase energy density, accelerate energy transformation, and support the electrification of consumer electronics and EVs |
419 | |||
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. | |||||
| 26 |
Argen Corporationargen.com
Global leader supporting dental laboratories in 105+ countries, committed to laboratory success as a partner rather than a competitor. |
411 | |||
| 27 |
Valence Surface Technologiesvalencesurfacetech.com
Global metal finishing provider offering a comprehensive range of services for high-value aerospace parts with 8 centers of excellence in North America |
405 | |||
| 28 |
Ceramic Proceramicpro.com
Global leader in nano ceramic protection solutions for vehicles, offering advanced coatings, paint protection films, and window films with a focus on innovation and excellence Trusted by professionals worldwide |
395 | |||
| 29 |
AMVAC U.S.amvac.com
A leading agricultural solutions provider committed to technology, innovation, and sustainability, focusing on proven chemistries, precision agriculture, GreenSolutionsโข, and sustainability solutions |
393 | |||
| 30 |
The Gill Corporationthegillcorp.com
Manufacture high-performance composite materials and products including honeycomb panels, specialty laminates, CNC machined parts, and fabricated assemblies for aerospace and transportation industries. |
387 | |||
| 31 |
Diamond Foundrydf.com
Production of single-crystal diamonds using zero-emission energy, enabling advanced electronics and sustainable alternatives to mined diamonds. |
357 | |||
| 32 |
CTC Globalctcglobal.com
Global industry leader in composite core technology for power grids, offering innovative solutions for utilities worldwide, enabling fast, cost-effective, and environmentally friendly grid expansion |
349 | |||
| 33 |
NuSil Technology, LLCnusil.avantorsciences.com
A global leader in ultra-high-purity materials for biomaterials and advanced technology markets, offering medical and space-grade silicones for over 35 years |
343 | |||
| 34 |
HCT by kdc/onehctgroup.com
Global provider of innovative packaging, formulation, and product development solutions for beauty, personal care, and home care industries. |
332 | |||
| 35 |
Gallo Glass Companygalloglass.com
A California-based glass manufacturer specializing in sustainable and high-quality glass production for the wine & spirits industry, with a focus on environmental impact mitigation |
322 | |||
| 36 |
Rhino Linings Corporationrhinolinings.com
A world leader in sprayed and rolled coatings and linings for industrial, municipal, and residential applications with a global network of applicators |
311 | |||
| 37 |
Arlon Graphicsarlon.com
Manufacturing high-quality cast vinyl graphic films for various markets worldwide, providing innovative material solutions for visual expression through distribution partners and customer-centric operations |
302 | |||
| 38 |
JSR Micro, Inc.jsrmicro.com
A global provider of innovative semiconductor, life sciences, and energy materials, leveraging polymer expertise to address unique challenges across industries |
266 | |||
| 39 |
Eagle Roofing Productseagleroofing.com
An American manufacturer of quality concrete roof tiles with a wide color selection, focusing on green solutions for increased curb appeal and energy savings worldwide |
249 | |||
| 40 |
C-Hawk Technology Int'lc-hawk.com
This company specializes in manufacturing plastic components and module assembly for various industries, with a focus on advanced technology and global presence |
233 | |||
| 41 |
Professional Plasticsprofessionalplastics.com
Global leader in fabrication and distribution of high-performance plastics, offering a wide range of plastic products and parts with a strong worldwide network |
232 | |||
| 42 |
Genogenomatica.com
Accelerates world's transformation to sustainable materials, replacing fossil fuels with plants. Creates molecules, ingredients, materials from sustainable sources. Powers high-performance for brands. |
232 | |||
| 43 |
Rock West Compositesrockwestcomposites.com
Designs, engineers, and manufactures quality composite products using various techniques, ensuring superior value and customer satisfaction with experienced personnel. |
209 | |||
| 44 |
kdc/one Chatsworthkdc-one.com
This company specializes in developing innovative skincare, haircare, and bath & body products using patented multi-fill technology and exclusive packaging solutions |
205 | |||
| 45 |
Airtech Advanced Materials Groupairtech.com
Global supplier of composite tooling, vacuum bagging, lightweight architectural, and additive manufacturing materials for diverse industries. |
202 | |||
| 46 |
Lilaclilacsolutions.com
A lithium extraction company located in Oakland, California, specializing in innovative solutions for lithium production |
202 | |||
| 47 |
FRALOCKfralock.com
Innovative manufacturer of engineered solutions for High Reliability applications in various industries, specializing in CIRLEXยฎ polyimide materials, flexible circuits, and technical ceramics |
190 | |||
| 48 |
Teknovateknova.com
Innovates manufacturing critical reagents, offering customizable solutions for cell and gene therapy, molecular diagnostics, and synthetic biology, accelerating discovery and development of novel therapies. |
184 | |||
| 49 |
Kirkhill, Inc.kirkhill.com
Diversified manufacturer founded in 1919, specializing in precision silicone seals for aerospace, rocket insulation, and custom engineered products for various markets |
183 | |||
| 50 |
Ceradyne, Inc.avon-technologiesplc.com
A California-based company develops and manufactures advanced technical ceramic products for defense, industrial, energy, automotive, medical, and electronic markets worldwide |
181 | |||
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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 13, 2026.
More company lists in California
- The largest companies in California 15,259
- Multinational companies in California 2,587
- SaaS companies in California 1,854
- Software Development companies in California 1,649
- AI companies in California 1,296
- Companies with in-house R&D in California 1,272
- Manufacturers in California 1,065
- Hardware manufacturers in California 984
- IT Services and IT Consulting companies in California 968
- Education providers in California 950
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- 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 802
- 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 536
The same list elsewhere in United States
- Chemical companies in the United States 1,383
- Chemical companies in Texas 140
- Chemical companies in Ohio 120
- Chemical companies in Pennsylvania 95
- Chemical companies in Illinois 74
- Chemical companies in New York State 61
- Chemical companies in Michigan 58
- Chemical companies in North Carolina 54
- Chemical companies in Georgia 51
- Chemical companies in New Jersey 51
- Chemical companies in Massachusetts 38
- Chemical companies in Indiana 34
- Chemical companies in Florida 33
- Chemical companies in Alabama 31
- Chemical companies in South Carolina 31
- Chemical companies in Wisconsin 31
- Chemical companies in Missouri 30
- Chemical companies in Minnesota 28
- Chemical companies in Tennessee 27
- Chemical companies in Connecticut 25
- Chemical companies in Houston 47