| # | Company | Employees |
|---|---|---|
| 1 |
Korn Ferrykornferry.com
It is a global consulting firm specializing in organizational design, hiring, workforce motivation, and professional development for career advancement. |
21,328 |
| 2 |
Protivitiprotiviti.com
Global consulting firm offering expertise in finance, technology, operations, data, digital, legal, HR, risk, and internal audit to help clients navigate future challenges |
13,479 |
| 3 |
Tredence Inc.tredence.com
Global data science solutions provider, focused on closing the gap between AI insights and tangible business value for clients across various industries. |
4,440 |
| 4 |
MAPmapconsulting.com
A performance improvement consulting firm offering a proven Management Systemโข to drive profitability, productivity, and breakthrough results for businesses |
2,119 |
| 5 | 1,864 | |
| 6 |
ADEC Innovationsadec-innovations.com
ADEC Innovations offers integrated industry expertise, data management, and software services to meet ESG needs, improve sustainability performance, and drive operational efficiencies globally |
1,801 |
| 7 |
Exponentexponent.com
A premium engineering and scientific consulting firm offering multidisciplinary expertise to solve complex challenges and innovate for a safer, sustainable world |
1,755 |
| 8 |
Sequoiasequoia.com
Sequoia specializes in total people investment, helping companies optimize outcomes through comprehensive rewards, including compensation, benefits, wellbeing, HR, payroll, and business protection |
1,607 |
| 9 |
AdvisoryCloudadvisorycloud.com
AdvisoryCloud provides professionals with a platform to monetize their expertise as advisors, connecting them with opportunities globally |
1,438 |
| 10 |
Cornerstone Researchcornerstone.com
Provides economic and financial analysis for litigation, utilizing academic experts and innovative research methods to solve complex legal and business problems. |
1,359 |
| 11 |
informalinformal.cc
Platform connecting top freelancers with businesses to help build, brand, and grow physical product businesses of all sizes |
1,162 |
| 12 |
DRIVEdriveshops.com
This consulting group specializes in automotive, collision, heavy duty truck repair, and tow services, offering training techniques and management solutions to boost business success |
1,063 |
| 13 |
Pacifica Senior Livingpacificaseniorliving.com
Passionate division of Pacifica Companies delivering personalized care services to seniors across 13 states in over 90 communities with ample growth opportunities |
1,048 |
| 14 |
StatusNeostatusneo.com
Delivers enterprise AI engineering, product platforms, and domain consulting to transform software lifecycles and business operations into scalable, outcome-driven, and governed digital capabilities. |
1,040 |
| 15 |
BSTdekra-insight.com
A global safety leader providing consulting services to industries such as chemical, oil and gas, transportation, and utilities to enhance business performance |
1,028 |
| 16 |
Agilisium Consultingagilisium.com
Data to Insights R&D and Engineering Lab specializing in GenAI, Advanced Analytics, and Solutions for Life Science industries, offering global services and talent support |
888 |
| 17 |
Tecolote Researchtecolote.com
With over 50 years of experience, Tecolote Research provides decision support for strategic and financial decisions to various public and private organizations |
805 |
| 18 | 783 | |
| 19 |
Uniqus Consultech Inc.uniqus.com
Global tech-enabled consulting firm providing specialized services in accounting, reporting, governance, risk, compliance, sustainability, and climate across international markets using integrated delivery models. |
774 |
| 20 |
Great Place To Workgreatplacetowork.com
global workplace culture authority providing surveys, data-driven insights, certification, and benchmarking to improve trust and business results worldwide |
675 |
| 21 |
Blanchardblanchard.com
Provides leadership development programs and learning experiences designed to improve individual and team performance across various organizational levels. |
650 |
| 22 |
The Pipeline Groupthepipelinegroup.io
Providing SDR-as-a-Service with top talent, proprietary technology, rigorous management, and data services to boost B2B tech sales pipeline. |
584 |
| 23 |
Systech Solutions, Incsystechusa.com
Provides comprehensive data engineering, artificial intelligence, and machine learning solutions to optimize business operations through specialized cloud analytics and global delivery centers. |
565 |
| 24 |
Cannoncannoncorp.us
A multidisciplinary engineering firm offering a wide range of services in land development, oil and gas, power generation, water resources, transportation, education, and aerospace |
561 |
| 25 |
Harris & Associatesweareharris.com
An employee-owned company providing consulting services in planning, financing, civil engineering, and construction management for communities across the West Coast |
527 |
| 26 |
COPE Health Solutionscopehealthsolutions.com
Consulting firm specializing in healthcare delivery networks, workforce training, and innovative solutions to improve healthcare access and operations. |
522 |
| 27 |
Forsys Incforsysinc.com
Helps enterprises modernize revenue creation, management, and scaling across CPQ, digital commerce, billing, CLM, and data science with AI-powered execution. |
513 |
| 28 |
Nan McKay and Associates (NMA)nanmckay.com
A leading provider of innovative solutions for communities nationwide, specializing in compliance-focused services for housing authorities, property management companies, and municipalities |
483 |
| 29 |
Rysun Labsrysun.com
Guides data and AI strategy alongside digital transformation programs for global enterprises and startups within high-tech, retail, ecommerce, and energy sectors. |
481 |
| 30 |
FirstService Residential in Californiafsresidential.com
A leading property management company in California offering customized full-service management for a variety of properties with exceptional customer service |
475 |
| 31 |
Triotrioadvisory.com
Global energy and sustainability advisory helping large clients transition to a net-zero future through strategy, implementation, and advanced technological solutions |
475 |
| 32 |
Calpine Energy Solutions, LLCcalpinesolutions.com
US retail energy business helping commercial and industrial businesses manage energy costs in deregulated markets with integrated products and services |
461 |
| 33 |
ECG Management Consultantsecgmc.com
Healthcare consulting firm working with clients to improve healthcare access, sustainability, and effectiveness through honest, tailored solutions and courageous initiatives |
459 |
| 34 |
Resources Global Professionalsrgp.com
Specializing in enterprise risk management consulting to help businesses identify, assess, and mitigate risks for improved decision-making and operational success |
459 |
| 35 |
Valueonshore ('VOS') Advisorsvalueonshore.com
Global advisory specializing in Governance, Risk Advisory, Accounting, Due Diligence, Technology Solutions, and Operations Consulting for multinational and Indian clients |
446 |
| 36 |
SQA Services, Inc.sqaservices.com
Global supplier quality services for quality-critical industries, offering audits, remediation, engineering, inspection, corrective action management, and real-time quality data worldwide |
445 |
| 37 |
Blue Matterbluematterconsulting.com
Specialized management consulting firm in the life sciences industry, providing strategic insights and innovative solutions to bio-pharmaceutical industry leaders worldwide |
412 |
| 38 |
Strettostretto.com
Provider of comprehensive case-management, depository solutions, loan-modification services, and technology tools for legal professionals and fiduciaries in the bankruptcy industry |
408 |
| 39 |
Vertisystem (A MOURI Tech Company)vertisystem.com
Business solutions company specializing in Cloud Technology and Staffing solutions for Fortune 500 clients across various sectors globally |
408 |
| 40 |
ProcDNAprocdna.com
Analytics and software firm based in San Francisco specializing in accelerating commercial and clinical investments for clients in life sciences industries |
403 |
| 41 |
Surabhisurabhillc.com
A multifaceted company specializing in healthcare revenue cycle management, medical equipment distribution, and BPO support services with a focus on quality and efficiency |
377 |
| 42 |
Medical Billingaplusbillers.com
Trusted medical billing company offering personalized revenue cycle management solutions to healthcare providers, prioritizing accuracy, efficiency, and compliance |
361 |
| 43 |
Avasantavasant.com
Management consulting firm specializing in digital transformation, sourcing advisory, and global strategy through high-value engagements, industry innovation, and youth-focused technology skill development programs. |
350 |
| 44 |
ADVATIX - Advanced Supply Chain and Logisticsadvatix.com
This company helps businesses grow their omnichannel presence by transforming operations through supply chain and logistics expertise, specifically in e-commerce and retail industries |
321 |
| 45 |
Ondarocasknx.com
A leading ServiceNow Elite partner specializing in digital transformation, offering end-to-end solutions to improve service quality and reduce costs for enterprise clients |
307 |
| 46 |
Integral Senior Livingislllc.com
Senior living community management company specializing in 3rd party management of independent living, assisted living, memory care, and new development properties across multiple states |
291 |
| 47 |
Risfond Executive Search (International)en.risfond.com
A leading high-end recruitment service with a global presence, offering executive search, talent pool development, and HR services across industries |
287 |
| 48 |
ArcToucharctouch.com
ArcTouch designs and develops engaging apps and websites for companies to connect with their customers, with a global team across three continents |
271 |
| 49 |
HJI Group Corporationhjigroup.com
Global multi-disciplinary corporation offering professional services in energy efficiency, urban development, transportation, water, environmental services, and information technology sectors |
269 |
| 50 |
Anser Advisoryaccenture.com
Anser Advisory is a strategic and creative consulting firm specializing in guiding programs and projects from concept to closeout with innovative solutions |
185 |
| 51 | 182 | |
| 52 |
Emprezaempreza.io
RevOps & Salesforce consulting: Specializing in holistic growth strategies by streamlining operational efficiencies across Sales, Marketing, and Customer Success for scalable solutions |
180 |
| 53 |
Premier Aquatics Services LLC.swimoc.com
A comprehensive aquatics service provider in Orange County offering swim school programs, CPR/AED courses, first aid training, and lifeguard services |
164 |
| 54 |
TrendSource, Inc.trendsource.com
TrendSource provides businesses with compliance documentation and measurement services across various industries, utilizing a network of professional Independent Contractors nationwide |
164 |
| 55 |
CULTURE PARTNERSculturepartners.com
This company activates and empowers organizations worldwide to achieve results by leveraging the transformative power of culture |
162 |
| 56 |
StoragePROยฎ 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 |
| 57 |
McLaren Strategic Solutions (MSS)mclarensv.com
Next-generation technology and digital transformation company offering advisory, engineering, and technology services across various industries, utilizing leading platforms. |
158 |
| 58 |
LSSIleansixsigmainstitute.org
Provider of Lean Six Sigma training and coaching services since 1998, helping organizations achieve substantial improvements in lead time, quality, safety, and cost reduction |
157 |
| 59 |
Econ One Researcheconone.com
Economic experts providing litigation and consulting services in various practice areas, delivering clear, logical, and timely findings for repeat clients |
156 |
| 60 |
Bristol Healthcare Services, Inc.bristolhcs.com
A technology-driven Healthcare BPO offering RCM solutions, including medical billing, coding, and revenue cycle management services to organizations in the US |
154 |
| 61 |
Winning by Designwinningbydesign.com
Global B2B revenue consulting and training company specializing in sustainable growth for Sales, Marketing, and Customer Success teams at leading organizations worldwide |
140 |
| 62 |
Trademarkiatrademarkia.com
Trademarkia offers a free visual search engine for trademarked logos, names, and slogans, with tools for trademark searches, filings, monitoring, and legal support |
122 |
| 63 |
Semler Brossysemlerbrossy.com
A leading executive pay consulting firm providing innovative solutions in compensation governance for a diverse range of companies |
115 |
| 64 |
Energy Experts Internationaleeintl.com
A leader in energy management consulting, offering creative solutions for clients in natural gas, electric power, and oil industries globally |
99 |
| 65 |
4Liberty, Inc.4liberty.com
Leading technical services provider specializing in energy and infrastructure, managing large programs for diverse clients in North America Helping utilities and customers navigate industry transitions |
96 |
| 66 |
DataBeesgetdatabees.com
DataBees provides high quality, verified lead data to sales and marketing teams globally, offering a cost-effective solution with dedicated research teams for each client |
85 |
| 67 |
Allitixallitix.com
People-driven consulting firm empowering individuals to drive results for clients Guided approach delivers immediate wins and skills for future success |
77 |
| 68 |
Portfolio Tportfoliot.com
A global technology venture studio focusing on creating disruptive solutions across various industries and spearheading cognitive technologies for positive impact |
62 |
| 69 |
Unleashing Leaders, Inc.unleashingleaders.com
The company helps teams break barriers to unleash leadership potential, accelerate changes, and achieve outcomes through customized consulting, coaching, and training services |
58 |
| 70 |
Calltasticcalltastic.com
Calltastic provides tailored customer contact solutions for startups and small businesses using strategic support, technology, AI, and a global workforce |
55 |
| 71 |
SaaScendsaascend.com
This company specializes in revenue operations strategies and systems to help clients build a strong foundation for long-term growth using Salesforce, marketing automation, demand generation, and data services |
47 |
| 72 |
Growthinkgrowthink.com
A strategic advisory and investment banking firm specializing in helping companies plan and achieve success, with recognition on the Forbes List |
47 |
| 73 |
Alliant Human Capitalalliant.com
Consulting firm specializing in organization and people strategies, including business performance improvement, motivation and rewards, leadership development, and sustainable transformation |
45 |
| 74 |
Advantage
Global management consulting firm partnering with industry leaders to enhance strategic capabilities and achieve competitive advantage |
36 |
| 75 |
AltiSalesaltisales.com
It specializes in developing efficient go-to-market processes, enhancing outbound efficiency, and providing consulting services to improve sales strategies for clients. |
34 |
| 76 |
Water, Energy and Technology (WET) Centerwetcenter.org
The company supports water, energy, and ag-tech innovators through training, coaching, networking, and fostering an inclusive environment for entrepreneurs and community members |
29 |
| 77 |
LeighFisherleighfisher.com
Global management consulting firm specializing in business planning, sustainability, government advisory, and strategy for aviation, infrastructure, and transportation markets |
28 |
| 78 |
The Krinsky Companythekrinskyco.com
A strategic consulting firm specializing in growth, strategy, and innovation within the healthcare industry for over 20 years |
17 |
| 79 |
THRIVE Consultingthrive-co.com
The company focuses on enabling people to lead longer, healthier lives by helping healthcare innovators succeed in launching and optimizing innovative therapies |
15 |
| 80 |
PTM Consulting LLCptm-consulting.com
A leading consulting firm in Life Sciences providing strategic support, technical services and innovative tools for R&D, manufacturing, and quality improvement projects globally |
15 |
| 81 |
The Mark USA Inc.themarkusa.com
This company helps organizations measure social impact, analyze data, and develop strategies for improving performance and reporting outcomes |
15 |
| 82 |
Detecon Inc. USAdetecon.com
Leading consulting firm within Deutsche Telekom Group, specializing in digital infrastructure and strategy advisory for global companies and government agencies |
14 |
| 83 |
Team Projectsteamprojects.com
Combining consulting expertise with incubation support to drive innovation and growth for businesses |
12 |
| 84 |
Zulu Impactzuluimpact.com
A digital marketing and business process outsourcing company specializing in providing innovative solutions to help businesses achieve success and thrive |
11 |
| 85 |
Seed2Exitseed2exit.com
Experienced management consultants supporting startups in their growth stage, offering strategic marketing, global sales, business development, and operational expertise |
10 |
| 86 |
RightSource Servicesrightsourceservices.com
A leader in administrative and procurement services, providing consulting, training, and support to businesses and government agencies for over two decades |
9 |
| 87 |
Behavioral Economics Labsfbel.com
The company uses behavioral science and advanced techniques to create tangible value for clients by separating causation from correlation |
8 |
| 88 |
Viridis Consulting LLCviridis-consulting.com
A clean energy consultancy passionate about transitioning to a carbon-free economy, specializing in management consulting, policy development, and environmental consulting for various industries |
7 |
| 89 |
Energy Resources Integration, LLCeripacific.com
Private energy engineering firm specializing in sustainability and energy efficiency solutions for businesses to reduce carbon footprint and improve energy management |
7 |
| 90 |
Cadeoresource-innovations.com
Energy consulting firm specialized in helping utilities and public agencies achieve clean energy goals through market research, evaluation, and policy analysis services |
7 |
| 91 |
Komotionkomotion.com
This company utilizes digital technology to drive innovation, marketing, sales, and operations for businesses, offering services in customer experience, analytics, design, and media development |
6 |
| 92 |
Pinnacle Intertechpinnacleii.com
Management consulting firm specializing in late stage start ups, focused on sustainable growth, IPO, or buyout through unique tools and experienced professional team |
6 |
| 93 |
TechNeal, Inc.techneal.com
A laboratory management and consultation company based in Pomona, California, offering support in clinical chemistry, immunology, hematology, toxicology, and genomics worldwide |
6 |
| 94 |
GIMZO TECHNOLOGYgimzotech.com
Gimzotech offers comprehensive business transformation services, focusing on strategic growth, results-driven solutions, and end-to-end support for clients' success |
5 |
| 95 |
Certified Data Center Design Groupcdcdg.com
Specializes in designing efficient, innovative, and flexible data center solutions worldwide, with expertise in green design and LEED certification |
5 |
| 96 |
Globesolute Corporationglobesolute.com
A strategic consulting company focused on maximizing business value, economic competitiveness, and social well-being through partnerships and innovative market strategies Celebrating ten years of quality service |
5 |
| 97 |
Skala Venturesskalaventures.com
A Barcelona-based consultancy firm specializing in innovation and transformation, offering services in +25 countries to help businesses adapt to future industry trends |
4 |
| 98 |
Jerome Consultingjeromeconsulting.com
Specializing in talent development, performance management, and strategic planning, the company helps business leaders achieve lasting competitive advantages through improved team performance |
4 |
| 99 |
Career Hire5career.hire5.co
Connecting international talent with job opportunities in US startups across different levels and fields, including engineering, analytics, and sales |
3 |
| 100 |
GP3 Consultinggp3consulting.com
GPยณ Consulting specializes in outsourcing brand management, marketing, sales strategy, and developing digital ROI metrics for print-based marketing They also offer website and social media optimization strategies |
3 |
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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 24, 2026.
More company lists in California
- The largest companies in California 12,813
- SaaS companies in California 1,617
- Software Development companies in California 1,386
- Venture capital and private equity firms in California 786
- IT Services and IT Consulting companies in California 730
- Venture Capital and Private Equity Principals companies in California 645
- AI companies in California 606
- AI-native companies in California 552
- Retail chains in California 527
- Hospitals and Health Care companies in California 519
- Financial Services companies in California 513
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- Education providers in California 498
- IT services companies in California 428
- Manufacturers in California 417
- Technology, Information and Internet companies in California 413
- Higher Education companies in California 376
- Public sector organisations in California 337
- Hardware manufacturers in California 335
- Critical infrastructure operators in California 293
- Government Administration companies in California 279
- Healthcare providers in California 277
- Education Administration Programs companies in California 277
- Real Estate companies in California 275
The same list elsewhere in United States
- Business Consulting and Services companies in the United States 1,246
- Business Consulting and Services companies in New York State 202
- Business Consulting and Services companies in Texas 123
- Business Consulting and Services companies in Illinois 73
- Business Consulting and Services companies in Virginia 69
- Business Consulting and Services companies in Massachusetts 61
- Business Consulting and Services companies in Florida 52
- Business Consulting and Services companies in Pennsylvania 50
- Business Consulting and Services companies in New Jersey 48
- Business Consulting and Services companies in Georgia 43
- Business Consulting and Services companies in Maryland 31
- Business Consulting and Services companies in Washington State 29
- Business Consulting and Services companies in Ohio 27
- Business Consulting and Services companies in New York 169
- Business Consulting and Services companies in Chicago 47
- Business Consulting and Services companies in Washington 32
- Business Consulting and Services companies in Boston 29
- Business Consulting and Services companies in Atlanta 27