| # | Company | Employees |
|---|---|---|
| 1 |
Seal Software, a DocuSign Companyseal-software.com
Utilizing AI to enhance digital agreements, the company is focused on transforming the future of smart contracts Now part of DocuSign |
8,475 |
| 2 |
CSAA Insurance Group, a AAA Insurercareers.csaa-insurance.aaa.com
The company is committed to excellence in providing insurance services, supporting employees, members, and communities, and embracing change for progress |
5,564 |
| 3 |
John Muir Healthjohnmuirhealth.com
Not-for-profit healthcare organization providing primary, specialty, trauma, behavioral health, and collaborative patient-centered medical services in multiple California counties. |
4,207 |
| 4 |
Mechanics Bankmechanicsbank.com
Providing personal and business banking, trust, estate services, and wealth management through numerous branches across California communities. |
2,753 |
| 5 |
Brown and Caldwellbrownandcaldwell.com
Privately-held environmental firm specializing in US water and environmental sectors Offering engineering, scientific, consulting, and construction services globally Passionate about innovation and service excellence |
2,556 |
| 6 |
Wind Riverwindriver.com
Providing secure, reliable software solutions and expertise for intelligent edge devices across automotive, aerospace, defense, industrial, medical, and telecommunications sectors. |
2,470 |
| 7 |
AAA Mountain West Groupmwg.aaa.com
A century-old commitment to serving Members and communities with insurance, roadside assistance, travel services, discounts, advocacy for alternative fuels, and community-focused programs |
2,085 |
| 8 |
Central Garden & Petcentral.com
Innovative and trusted provider of products for greener lawns, blooming gardens, healthier pets, and stronger communities with a passionate team of over 6,700 employees |
1,999 |
| 9 |
Del Monte Foods, Inc.delmontefoods.com
Leading the way in plant-based food, the company offers a range of nutritious and accessible brands for a healthier future |
1,942 |
| 10 |
Exadelexadel.com
Global software consulting and development company helping enterprises transform businesses with end-to-end software solutions, design, engineering, and managed services. |
1,816 |
| 11 |
Carollo Engineerscarollo.com
Specializing solely in water related engineering, we provide innovative solutions, unparalleled client service, and a collaborative working environment since 1933 |
1,803 |
| 12 |
Amerit Fleet Solutionsameritfleetsolutions.com
Amerit specializes in fleet maintenance and repair services, boasting professionalism, customized programs, and over 1,800 skilled technicians nationwide for improved fleet reliability |
1,311 |
| 13 |
Dreyer's Grand Ice Creamdreyersgrandicecream.com
A leading ice cream business in the US, part of a global team with a strong portfolio of beloved brands Passionate about innovation and excellence |
1,252 |
| 14 |
Catalightcatalight.org
Dedicated to empowering individuals with developmental disabilities to choose their own paths by breaking down barriers and biases for a more equitable world |
734 |
| 15 |
Heffernan Insurance Brokersheffins.com
Provider of custom insurance solutions for unique needs, offering personal service with a commitment to community, employee-owned, serving clients coast to coast |
695 |
| 16 |
Matson Logisticsmatson.com
Provider of customized logistics solutions that improve supply chain efficiency through sourcing, storage, distribution, transportation, warehousing, and overseas support services |
669 |
| 17 |
Basic American Foodsbaf.com
Production and supply of dehydrated food products for restaurants, schools, hospitals, grocery, and club stores worldwide. |
639 |
| 18 |
Solvd, Inc.solvd.com
An end-to-end software engineering and consulting firm with over 800 employees, partnering with leading technology companies to deliver digital solutions across industries |
571 |
| 19 |
The Arcticom Groupthearcticomgroup.com
A family of HVACR operating companies offering high-quality services, maintenance, repairs, and installations with a focus on efficiency and customer satisfaction |
491 |
| 20 |
AEI Consultantsaeiconsultants.com
A company offering building, environmental, land, and sustainability consulting services across North America, working with various players in real estate industry |
444 |
| 21 |
Fehr & Peersfehrandpeers.com
Transportation planning and engineering firm providing innovative, data-driven solutions to improve mobility, safety, and community well-being nationwide. |
438 |
| 22 |
BASS Medical Groupbassmedicalgroup.com
Physician-owned and patient-centered organization providing high quality, cost-effective healthcare services with a focus on community-based independent physician practices in California |
400 |
| 23 |
MPFmpf-tnr.com
Specializing in large capital program delivery, we serve both public and private sectors including transit agencies, design firms, and railroads |
381 |
| 24 |
TrustArctrustarc.com
TrustArc offers a Privacy Management Platform to help organizations stay compliant with data privacy regulations through automation and continuous privacy intelligence |
379 |
| 25 |
City of Walnut Creekwalnut-creek.org
The company is located in Walnut Creek, California and serves as a central hub for Contra Costa County, with a staff of approximately 350 employees |
367 |
| 26 |
Boomerang Healthcareboomeranghc.com
Specializing in individualized treatment plans for pain management, psychological support, physical therapy, and spinal intervention for injured workers and community patients |
364 |
| 27 |
MKA International, Inc.mkainc.com
A multidisciplinary Construction & Engineering Consulting firm offering technical assistance on property damage claims, litigation support, and specialized services to clients worldwide |
353 |
| 28 |
Better Homes and Gardens Real Estate | Mason McDuffiebhghome.com
A real estate company with a long-standing history specializing in planned unit developments and innovative residential projects, consistently ranked among the top 20 nationwide |
337 |
| 29 |
Kinder's Premium Quality Seasonings & Sauceskinders.com
A family-owned company specializing in high-quality seasonings, rubs, marinades, and sauces, continuing a legacy of flavor and customer service since 1946 |
331 |
| 30 |
United Business Bankunitedbusinessbank.com
This company provides personalized banking services, focusing on building relationships and offering professional financial expertise to help clients manage cash flow and grow their businesses |
263 |
| 31 |
Clark Consultingnewportrgoup.com
Financial consulting company rebranded as Newport Group Visit our new LinkedIn page for updates on retirement, investment, and benefit services |
223 |
| 32 |
VICIvicicollection.com
Stylish and affordable clothing brand empowering women with confidence through versatile and easy-to-mix pieces for various occasions and lifestyles |
190 |
| 33 |
Network Optixnetworkoptix.com
Network Optix provides an open, extensible video VPaaS platform, Nx Meta, enabling custom AI-powered video solutions for companies to enhance their offerings |
182 |
| 34 |
Alameda Mortgage Corporationalamedamortgage.com
California-based mortgage lender offering well-advised, affordable loans with a focus on quality over quantity, delivering quick 15-day closes and personalized service |
177 |
| 35 |
Hawthorne Health, Inc.hawthornehealth.com
Revolutionizing clinical trials by bringing them directly to patients through a network of healthcare professionals, improving data quality and patient experience |
173 |
| 36 |
John Muir Medical Groupjohnmuirhealth.com
A group of over 350 clinicians providing primary care services, hospitalist program, urgent cares, and continuity care sites in the community |
172 |
| 37 |
CCH - (Christian Church Homes)wearecch.org
This company builds and manages affordable housing communities, fostering human dignity, independence, and sustainability within caring environments for residents and employees alike |
170 |
| 38 |
StoragePRO庐 Managementstoragepromanagement.com
Self-storage management and consulting firm with experienced team offering in-house services for revenue growth, asset value increases, and successful results Headquartered in Walnut Creek, CA |
160 |
| 39 |
Episcopal Senior Communitiescovia.org
The company creates and manages communities, connecting people through shared interests and providing a platform for communication and collaboration |
159 |
| 40 |
ASGalpinesg.com
Unconventional business invests in vertical SaaS companies, building them into industry-leading software platforms. Combines expertise and shared resources for growth. |
158 |
| 41 |
KCCTechkcctech.com
Providing Connectivity and Digitalization Services to Wireless Network Operators and Managed Service Providers, specializing in Open RAN systems and advanced Software Solutions |
147 |
| 42 |
Buyerlinkbuyerlink.co
An online auction marketplace offering performance-based marketing solutions across various industries, with a focus on hyper-targeted consumer demand and lead generation services |
140 |
| 43 |
ShimentoX Technologiesshimento.com
Cutting edge AI/ML, technology, risk, and finance solutions provider focusing on digital transformation, cloud services, big data, AI/ML development, and financial risk consulting |
89 |
| 44 |
One Planet Grouponeplanetgroup.com
A private equity firm investing in online technology and media businesses, as well as early-stage companies, with a focus on societal impact |
80 |
| 45 |
Destination Wealth Managementdestinationwm.com
A fee-based wealth management firm offering investment research, portfolio management, and financial planning services to individuals and institutions globally |
61 |
| 46 |
SBJ Capitalsbjcap.com
Private investment firm with $600 million under management, specializing in investing in founder and family-owned consumer and services companies, providing strategic advice and partnership support |
36 |
| 47 |
CenterMedcentermed.com
This company provides products and services for medical providers to improve patient outcomes They prioritize integrity and leverage cutting-edge technology in surgical planning |
33 |
| 48 |
Bransysbransys.com
A global company specializing in IoT solutions for automotive industry, offering custom software and hardware to optimize efficiency and productivity |
32 |
| 49 |
USCF Investmentsuscfinvestments.com
An asset management firm offering exchange-traded products (ETP) and exchange-traded funds (ETF), operating on the leading edge of product innovation |
31 |
| 50 |
Incline Gaming Marketinginclinegaming.com
A B2C marketing services company specialized in helping global sports betting and online casino operators with user acquisition, CRM, and creative solutions |
25 |
| 51 |
Skyline Building Careskylinebuildingcare.com
Professional janitorial services company specializing in comprehensive building maintenance solutions with a focus on high-quality, customized cleaning using advanced equipment and green products |
22 |
| 52 |
Spear Marketing Groupspearmarketing.com
A full-service demand generation agency specializing in helping B2B companies convert leads to revenue through strategic expertise and innovative marketing techniques |
21 |
| 53 |
Browman Development Companybrowmandevelopment.com
Develops, leases, and manages shopping and entertainment centers for long-term investment, building high-quality retail spaces filling market needs and serving communities. |
18 |
| 54 |
Advisor Partnersadvisorpartners.com
Boutique investment manager specializing in tailored portfolio solutions for independent advisors, wealth managers, and family offices, using research-driven approach and advanced technology |
15 |
| 55 |
Bedell Frazier Investment Counsellingbedellfrazier.com
Independent SEC registered investment firm customizing and actively managing individual portfolios since 1975, always prioritizing clients' best interests and providing holistic financial planning |
10 |
| 56 |
Constructive Systems Incconstructivesystemsinc.com
A sustainability-focused company providing affordable clean energy, climate-smart agriculture, outdoor education, and custom sustainable solutions for clients |
4 |
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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