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The 56 largest companies in Walnut Creek

Tamtam tracks 56 companies headquartered in Walnut Creek. This list ranks all of them by number of employees on LinkedIn, led by Seal Software, a DocuSign Company, CSAA Insurance Group, a AAA Insurer and John Muir Health. Their median headcount is 337. Half of them were founded in 1997 or later.

馃嚭馃嚫 Walnut Creek56 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
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

Software Development 馃嚭馃嚫 Walnut Creek 8,475 n/a
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

Insurance 馃嚭馃嚫 Walnut Creek 5,564 n/a
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.

Hospitals and Health Care 馃嚭馃嚫 Walnut Creek 4,207 n/a
4
Mechanics Bankmechanicsbank.com

Providing personal and business banking, trust, estate services, and wealth management through numerous branches across California communities.

Banking 馃嚭馃嚫 Walnut Creek 2,753 1905
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

Environmental Services 馃嚭馃嚫 Walnut Creek 2,556 1947
6
Wind Riverwindriver.com

Providing secure, reliable software solutions and expertise for intelligent edge devices across automotive, aerospace, defense, industrial, medical, and telecommunications sectors.

Software Development 馃嚭馃嚫 Walnut Creek 2,470 1981
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

Consumer Services 馃嚭馃嚫 Walnut Creek 2,085 1900
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

Manufacturing 馃嚭馃嚫 Walnut Creek 1,999 1980
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

Food and Beverage Services 馃嚭馃嚫 Walnut Creek 1,942 1886
10
Exadelexadel.com

Global software consulting and development company helping enterprises transform businesses with end-to-end software solutions, design, engineering, and managed services.

Software Development 馃嚭馃嚫 Walnut Creek 1,816 1998
11
Carollo Engineerscarollo.com

Specializing solely in water related engineering, we provide innovative solutions, unparalleled client service, and a collaborative working environment since 1933

Environmental Services 馃嚭馃嚫 Walnut Creek 1,803 1933
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

Vehicle Repair and Maintenance 馃嚭馃嚫 Walnut Creek 1,311 2010
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

Manufacturing 馃嚭馃嚫 Walnut Creek 1,252 1928
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

Non-profit Organizations 馃嚭馃嚫 Walnut Creek 734 n/a
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

Insurance 馃嚭馃嚫 Walnut Creek 695 1988
16
Matson Logisticsmatson.com

Provider of customized logistics solutions that improve supply chain efficiency through sourcing, storage, distribution, transportation, warehousing, and overseas support services

Transportation, Logistics, Supply Chain and Storage 馃嚭馃嚫 Walnut Creek 669 1987
17
Basic American Foodsbaf.com

Production and supply of dehydrated food products for restaurants, schools, hospitals, grocery, and club stores worldwide.

Food and Beverage Manufacturing 馃嚭馃嚫 Walnut Creek 639 1933
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

IT Services and IT Consulting 馃嚭馃嚫 Walnut Creek 571 2011
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

Facilities Services 馃嚭馃嚫 Walnut Creek 491 2017
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

Environmental Services 馃嚭馃嚫 Walnut Creek 444 1992
21
Fehr & Peersfehrandpeers.com

Transportation planning and engineering firm providing innovative, data-driven solutions to improve mobility, safety, and community well-being nationwide.

Civil Engineering 馃嚭馃嚫 Walnut Creek 438 1985
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

Medical Practices 馃嚭馃嚫 Walnut Creek 400 2006
23
MPFmpf-tnr.com

Specializing in large capital program delivery, we serve both public and private sectors including transit agencies, design firms, and railroads

Civil Engineering 馃嚭馃嚫 Walnut Creek 381 2022
24
TrustArctrustarc.com

TrustArc offers a Privacy Management Platform to help organizations stay compliant with data privacy regulations through automation and continuous privacy intelligence

Software Development 馃嚭馃嚫 Walnut Creek 379 1997
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

Government Administration 馃嚭馃嚫 Walnut Creek 367 1914
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

Hospitals and Health Care 馃嚭馃嚫 Walnut Creek 364 n/a
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

Construction 馃嚭馃嚫 Walnut Creek 353 n/a
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

Real Estate 馃嚭馃嚫 Walnut Creek 337 1887
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

Food and Beverage Manufacturing 馃嚭馃嚫 Walnut Creek 331 1946
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

Banking 馃嚭馃嚫 Walnut Creek 263 2004
31
Clark Consultingnewportrgoup.com

Financial consulting company rebranded as Newport Group Visit our new LinkedIn page for updates on retirement, investment, and benefit services

Financial Services 馃嚭馃嚫 Walnut Creek 223 n/a
32
VICIvicicollection.com

Stylish and affordable clothing brand empowering women with confidence through versatile and easy-to-mix pieces for various occasions and lifestyles

Retail 馃嚭馃嚫 Walnut Creek 190 2012
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

Software Development 馃嚭馃嚫 Walnut Creek 182 2011
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

Financial Services 馃嚭馃嚫 Walnut Creek 177 1968
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

Research Services 馃嚭馃嚫 Walnut Creek 173 2015
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

Hospitals and Health Care 馃嚭馃嚫 Walnut Creek 172 1996
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

Non-profit Organizations 馃嚭馃嚫 Walnut Creek 170 1961
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

Business Consulting and Services 馃嚭馃嚫 Walnut Creek 160 1975
39
Episcopal Senior Communitiescovia.org

The company creates and manages communities, connecting people through shared interests and providing a platform for communication and collaboration

Non-profit Organizations 馃嚭馃嚫 Walnut Creek 159 1965
40
ASGalpinesg.com

Unconventional business invests in vertical SaaS companies, building them into industry-leading software platforms. Combines expertise and shared resources for growth.

Software Development 馃嚭馃嚫 Walnut Creek 158 2016
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

Telecommunications 馃嚭馃嚫 Walnut Creek 147 2016
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

Advertising Services 馃嚭馃嚫 Walnut Creek 140 2001
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

IT Services and IT Consulting 馃嚭馃嚫 Walnut Creek 89 2009
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

Venture Capital and Private Equity Principals 馃嚭馃嚫 Walnut Creek 80 2015
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

Financial Services 馃嚭馃嚫 Walnut Creek 61 1986
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

Venture Capital and Private Equity Principals 馃嚭馃嚫 Walnut Creek 36 n/a
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

Medical Equipment Manufacturing 馃嚭馃嚫 Walnut Creek 33 2017
48
Bransysbransys.com

A global company specializing in IoT solutions for automotive industry, offering custom software and hardware to optimize efficiency and productivity

Software Development 馃嚭馃嚫 Walnut Creek 32 2008
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

Investment Management 馃嚭馃嚫 Walnut Creek 31 2005
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

Advertising Services 馃嚭馃嚫 Walnut Creek 25 2020
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

Facilities Services 馃嚭馃嚫 Walnut Creek 22 2010
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

Advertising Services 馃嚭馃嚫 Walnut Creek 21 2009
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.

Leasing Non-residential Real Estate 馃嚭馃嚫 Walnut Creek 18 1989
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

Financial Services 馃嚭馃嚫 Walnut Creek 15 2001
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

Financial Services 馃嚭馃嚫 Walnut Creek 10 1975
56
Constructive Systems Incconstructivesystemsinc.com

A sustainability-focused company providing affordable clean energy, climate-smart agriculture, outdoor education, and custom sustainable solutions for clients

Environmental Services 馃嚭馃嚫 Walnut Creek 4 2015

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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