DesignRush industry experts identified the leading business consulting firms in California helping businesses with risk management, investment opportunities, company restructuring and more. Compare listings by average rates, team size and reviews to pick the best partner for your needs.

Best California Business Consulting Company Rankings

11 Companies - Rankings updated: September 10, 2026

Every agency featured on DesignRush is vetted for expertise and client satisfaction to support your decision-making. Some listings may be sponsored.

United States × California × Finance × $1,000 - $10,000 × Clear Filters
  • Helping Forward Thinking Companies Transform Digital Visions Into Value

    Award-winning USA-based Generative-AI consultancy developing the future of intelligent solutions. We revolutionize business with cutting-edge, responsive AI technologies delivered cost-effectively, and specialize in delivering projects on-time and within budget...

    Top Services:

    • AI Development
    • Web Development
    • Software Development
    • Mobile App Development
    • Blockchain
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    5 Projects Listed

    GenAI.Labs Services

    • AI Development
    • Web Development
    • Software Development
    • Mobile App Development
    • Blockchain
    • Business Consulting
    • IT Services
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • ServiceNow
    • Rockport Healthcare Services
    • Ray-Ban
    • UCLA
    • Quantum Metric
    • City of San Diego
    • AlliedGlobalMarketing
    • US Department of Education
    • WestHealth
    • Gucci
    Data sourced from the agency's DesignRush profile

    GenAI.Labs Reviews & Testimonials

    • Alyssa Caridi
      Alyssa Caridi VP, Innovation at AGM
      5.0

      AI Development Review from Alyssa Caridi

      GenAI-Labs helped our agency build a centralized AI-powered platform covering influencer discovery, publicity monitoring, social listening, campaign management, and client reporting. Beforehand, these processes were spread across separate tools and required a lot of manual research and report preparation. Their team quickly understood our workflows and built a system that brings campaign data, creator information, media coverage, and reporting into one place. Reporting that used to take days or weeks now takes a fraction of that time, and our teams can manage far more campaigns without a matching rise in overhead.

    • Brandon Cohen
      Brandon Cohen COO at Elco lighting
      5.0

      AI Development Review from Brandon Cohen

      GenAI-Labs was a valuable partner in helping us think through AI and automation opportunities for our organization. They brought a strong mix of strategic thinking and practical guidance, and helped us identify where intelligent systems could streamline workflows, reduce friction, and support future growth. What we appreciated most was that they kept the work grounded in real business value rather than making it feel theoretical. Their team was responsive, thoughtful, and easy to work with throughout the engagement.

    • Dana Grobman
      Dana Grobman Studio Operations Associate at Clayla TLV
      5.0

      Web Design Review from Dana Grobman

      GenAI.Labs helped us bring the Clayla TLV website to life, and honestly, they just got us from the start. We needed a site that looked beautiful but also made it super easy for people to book events, workshops, or studio timeand they delivered exactly that. The booking flow is smooth, the design feels like us, and its taken a ton of manual work off our plate. They were responsive, creative, and just easy to work with the whole way through.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Superior Business Solutions

    Sigma Software specializes in developing software and is a globally distributed team of more than 2000 skilled IT professionals, spanning 12 countries including the USA, Sweden, UK, Canada, Israel, Singapore, UAE, Australia, Austria, Ukraine, and more. With a track record of over 20 successful years, we take...

    Top Services:

    • Software Development
    • Web Design
    • Mobile App Development
    • VR/AR
    • Business Consulting
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    14 Projects Listed

    Sigma Software Services

    • Software Development
    • Web Design
    • Mobile App Development
    • VR/AR
    • Business Consulting
    • Web Development
    • UI/UX Design
    • Cybersecurity
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Knorr-Bremse
    • AstraZeneca
    • Volvo Penta
    • SAS
    • Fortum
    • Mindvalley
    • Aol.
    • IGT
    • Viaplay
    • DanAds
    Data sourced from the agency's DesignRush profile

    Sigma Software Reviews & Testimonials

    • Nikita Vershinin
      Nikita Vershinin VP of Engineering at Ankorstore
      5.0

      Software Development Review from Nikita Vershinin

      We've partnered with Sigma Software for almost three years, and they proved to be a strong partner with whom we'll keep working. Their adaptability and willingness to get things done are unique, setting them apart from other providers. Moreover, they demonstrate a strong sense of ownership.

    • Michael Meyer
      Michael Meyer Managing director at trendwaerts GmbH
      5.0

      Software Development Review from Michael Meyer

      We were so positively surpised and happy about Sigmas services - as usual I might add. It is a pleasure working with their software engineers. After we provided a briefing, the effort estimation came right away. Shortly after the project started we could see first tangible results. The code quality was excellent and comprehensive. Minor feedback was implemented right away. What can I say more: 10 out of 10 points!

    • Esther Howard
      Esther Howard Founder / CEO at Bezyl
      5.0

      Mobile App Development Review from Esther Howard

      The client is incredibly happy with Sigma's services and work. It has referred 3 other clients who also say how much they really love the team and process to get set up with the agency. Sigma is a fantastic company with excellent experienced professionals. Its experts care about quality and customer satisfaction, and they operate like the internal team's extension. (Verified via email)

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Strategist | Speaker | Consultant

    TanaMSession.com is a woman/minority-owned small enterprise Human Resources firm specializing in organizational and change management, executive leadership coaching and Diversity, Equity, Inclusion & Belonging...

    Top Services:

    • Business Consulting
    • HR Outsourcing
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $375/hr
    Minimal Budget
    $1,000 - $10,000

    TMS Business Solutions Services

    • Business Consulting
    • HR Outsourcing
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Madison Reed
    • Berkshire Residential Investments
    • Spotify
    • NASA
    • LT Apparel
    • Dolce & Gabbana
    • Universal Music Group
    • USDA
    • NCMA
    • DLL Group
    Data sourced from the agency's DesignRush profile
  • Helping Founders and Entrepreneurs accelerate business growth.

    Helping early-stage companies gain financial clarity through growth strategy and fundraising readiness. Argona Partners is a collective of hands-on startup experts helping founders and entrepreneurs scale and accelerate their business by providing collaborative, science-based strategy consulting and...

    Top Services:

    • Business Consulting
    Location
    Fremont, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $300/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    1 Project Listed

    Argona Partners Services

    • Business Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Soundspace
    • Omnibio Energy
    • Forest Founders Rewards
    • GearBrain
    • CleanSole
    • Green Fortress Engineering
    • AIM-Hi
    Data sourced from the agency's DesignRush profile

    Argona Partners Reviews & Testimonials

    • Bryan
      Bryan Review from Google
      5.0

      Bryan's Review Sourced from Google

      This is a really great group. I recently met with them to go over a small business I’m going to start. We were able to plan financials, goals, timelines and were to give me some great insights.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Transforming Workplaces | Inspiring Futures

    The HR Innovator Group helps businesses transform their peopler operations with customized HR support, compliance expertise, and HR technology optimization, building scalable systems that drive growth and culture...

    Top Services:

    • HR Outsourcing
    • Business Consulting
    Location
    San Diego, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $85/hr
    Minimal Budget
    $1,000 - $10,000

    The HR Innovator Group Services

    • HR Outsourcing
    • Business Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Meridian Counseling
    • Next Day Access
    • Odyssey Charter Schools
    • JJH Consulting
    • HipTen, LLC
    • Fostering Solutions
    • NOVA Biologics
    • NUCO Consulting
    • Advantech
    • Bridge Appliances
    Data sourced from the agency's DesignRush profile

    The HR Innovator Group Reviews & Testimonials

    • Michael Karam
      Michael Karam Review from Google
      5.0

      Michael Karam's Review Sourced from Google

      Stephanie and The HR Innovator Group provide a refreshingly professional and passionate approach to HR consulting services. As a vendor partner, I've seen their team deliver excellent results and positive culture boosts to their clients. With The HR Innovator Group, "above and beyond" is their standard. "White glove" level of service is the norm. A true HR partner and constant reminder for clients that they made the right decision to work with The HR Innovator Group.

    • Laura Bender
      Laura Bender Review from Google
      5.0

      Laura Bender's Review Sourced from Google

      Working with Stephanie and the entire team at The HR Innovator Group has been an absolute pleasure. Their expertise, professionalism, and genuine care for their clients truly sets them apart. They take the time to understand your unique needs and offer thoughtful, strategic HR solutions that make a real impact. Stephanie is incredibly knowledgeable and approachable—she and her team are a true asset to any business looking to strengthen their HR foundation. Highly recommend!

    • Dwayne Edwards
      Dwayne Edwards Review from Google
      5.0

      Dwayne Edwards's Review Sourced from Google

      A True Leader in People & Progress Stephanie is the driving force behind our people-first culture. As our HR Director, she doesn’t just manage human resources, she transforms them. Her innovative approach to employee engagement, policy development, and organizational structure has reshaped how we grow and retain top-tier talent. Stephanie leads with empathy, strategy, and vision. Whether she’s rolling out cutting-edge HR tech, improving our onboarding experience, or championing diversity and inclusion, she ensures our people always come first. Her forward-thinking mindset is exactly what HR in today’s world demands. She’s not only an expert in compliance and process but a mentor, a problem-solver, and a trusted partner to leadership and staff alike. Under Stephanie’s direction, HR has become more than just a department it’s a cornerstone of our success.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • IT, Business, BPO, Audit, Tax and Advisory are just the beginning.

    Grant Thornton LLP (US) is an IT, project management, audit, tax, AgTech, and BPO company headquartered in Chicago, Illinois with over 50 U.S. offices and access to a global network or member firms in over 135 countries. We offer a broad range of services in strategy and consulting, operations, technology and...

    Top Services:

    • Accounting
    • Business Consulting
    • Market Research
    • HR Outsourcing
    • Software Development
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $35/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    2 Projects Listed

    Grant Thornton Services

    • Accounting
    • Business Consulting
    • Market Research
    • HR Outsourcing
    • Software Development
    • IT Services
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Financial industry
    • Real estate industry
    • Media and Entertainment industry
    Data sourced from the agency's DesignRush profile

    Grant Thornton Reviews & Testimonials

    • Theodore Mall
      Theodore Mall Review from Google
      4.0

      Theodore Mall's Review Sourced from Google

      One of the world’s leading organizations of independent audit, tax and advisory firms. Grant Thornton has revenues in excess of $1.9 billion and operates more than 50 offices.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Trusted Accounting Solutions

    As a business owner or leader, have you given up on having quality bookkeeping and financial reporting for your business? Barta Business Group is a team of bookkeeping, accounting, and finance professionals providing outsourced solutions for small and mid-sized businesses and nonprofits...

    Top Services:

    • Business Consulting
    • Accounting
    Location
    Fresno, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $125/hr
    Minimal Budget
    $1,000 - $10,000

    Barta Business Group Services

    • Business Consulting
    • Accounting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Interim
    • Small World Journeys
    • Miss Peabody's Southern Tea Cakes
    Data sourced from the agency's DesignRush profile

    Barta Business Group Reviews & Testimonials

    • Erin Jobe
      Erin Jobe Review from Google
      5.0

      Erin Jobe's Review Sourced from Google

      We are a non-profit that experienced rapid growth and facing an increasingly complex landscape of grant restrictions and financial reporting requirements - we were in need of an experienced consultant to support us in leveling up and streamlining our bookkeeping and finance processes. Dean connected us with Nancy from his team, and Nancy has been absolutely incredible. She not only guided us in untangling our financials but also in updating our processing and implementing best practices. She's an excellent teacher and communicator in addition to being extremely knowledgeable and unafraid of taking on complex issues. We are so relieved to be in a much stronger spot with robust systems for achieving the financial clarity and reporting that we need to make sound decisions and stay compliant with funders, thanks to Dean and Nancy.

    • Jim Steurnagel
      Jim Steurnagel Review from Google
      5.0

      Jim Steurnagel's Review Sourced from Google

      What can I say about Barta Business Group? I work in the live events industry, and to say that the last few years have been temultuous would be an understatement. They took the mess I had made while closing one business, and opening another, and laid it all out straight. I was running on a very basic invoicing software, and they got me up to speed with something professional I can use with any bookkeeper, and my business is running so much more smoothly because of it. Thanks guys. Highly recommend!

    • Aimee Zygmonski
      Aimee Zygmonski Review from Google
      5.0

      Aimee Zygmonski's Review Sourced from Google

      We're a small, national, nonprofit member association with a cranky database and lots of internal financial quirks. Barta Business Group stepped in to clean up our books and get us on the right track. Within a few short months, Dean was able to create better systems for financial accountability, wrangle our database into clear and consistent shape so we knew where we stood on income and expenses, provide support to our nascent board treasurer, and most of all, do all of this with a great attitude. We love working with Dean and feel confident that our books are in the best of hands.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Strategy, Analytics & Intelligent Systems

    We build intelligent systems that improve decision-making, automate operations, and strengthen product performance. Our team blends strategy, analytics, and AI to deliver measurable improvements for enterprises, startups, and government clients...

    Top Services:

    • Business Consulting
    • AI Development
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $140/hr
    Minimal Budget
    $1,000 - $10,000

    Sogos Consulting Services

    • Business Consulting
    • AI Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Disney
    • Nestlé
    • MilkPEP
    Data sourced from the agency's DesignRush profile
  • Built Differently to Delight.

    QuisLex is an award-winning alternative legal services provider that specializes in managed document review, contract management, compliance services, legal spend management, and legal operations consulting...

    Top Services:

    • BPO
    • Business Consulting
    Location
    San Francisco, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $20/hr
    Minimal Budget
    $1,000 - $10,000

    Quislex Services

    • BPO
    • Business Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • London Interbank
    • Virtual Lunch
    • Priori
    Data sourced from the agency's DesignRush profile
  • Marketing Solutions That Grow Your Business - Not Your Overhead.

    One of the nation's largest warehouses of high-quality consumer and corporate data is made available to enterprises by US Data Corporation. Every time they collaborate with us, customers take use of our comprehensive offering of goods and services, huge library of tactics, and smart prospect modelling...

    Top Services:

    • Social Media Marketing
    • Advertising
    • Digital Marketing
    • Email Marketing
    • Business Consulting
    • Show more
    Location
    Westlake Village, California
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000

    US Data Corporation Services

    • Social Media Marketing
    • Advertising
    • Digital Marketing
    • Email Marketing
    • Business Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Walmart
    • Merrill Lynch
    • Dollar Tree
    • Walgreens
    • Good Year Tires
    • Deloitte
    • Wells Fargo
    • University of California
    • American Red Cross
    • Hearst Media
    Data sourced from the agency's DesignRush profile

    US Data Corporation Reviews & Testimonials

    • Stephanie Parlegreco
      Stephanie Parlegreco Review from Google
      4.0

      Stephanie Parlegreco's Review Sourced from Google

      Simple process, knowledgeable rep, good list…could have been a shorter turn-over time…overall pretty good experience.

    • Michael Oliver
      Michael Oliver Review from Google
      1.0

      Michael Oliver's Review Sourced from Google

      We used US Data Corporation for a direct mailing to high school students for ACT and SAT test prep. The guy promised me the list was anyone that had taken the PSAT in the last year. This would mean the students are in 10th or 11th grade. He sent me 5,000 records with parent names and the zip codes I was interested. We sent out the mail piece and received zero response. As I started to do some research as to why, our accountant comes in and hands me a copy of the mailing. Her daughter is already in college! Then she looks up other names on the list I purchased in her neighborhood and tells me they are all in college and some have even graduated from college. I also sent the list to another parent with addresses on her street. All of them were also college students. They sold me old data!!! We are all very upset, as a small business with 6 employees, we cannot afford to lose out and waste marketing dollars like this. We will not recommend them nor do business with them ever again. It makes us not want to rent a list from any company.

    • Megan Filey
      Megan Filey Review from Google
      5.0

      Megan Filey's Review Sourced from Google

      I have purchased two email campaigns from US Data and have had a good experience both times. Everyone I have spoken with at the company has been friendly and professional, and the campaigns went off without a hitch. Overall, very positive experience, we will definitely be using them again in the future.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • We Help Early-Stage Businesses Scale

    We help start-ups with three service areas: strategic coaching and advisory for a more low-touch point need, a full-service outsourced CFO offering from accounting to financial planning and raising capital, and a specialized digital marketing offering...

    Top Services:

    • PPC
    • Advertising
    • SEO
    • Social Media Marketing
    • Digital Marketing
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $135/hr
    Minimal Budget
    $1,000 - $10,000

    AngelytiX Consulting Services

    • PPC
    • Advertising
    • SEO
    • Social Media Marketing
    • Digital Marketing
    • Web Design
    • Web Development
    • Business Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • NonProfit Industry
    • Ferresi
    • Top View Construction
    Data sourced from the agency's DesignRush profile

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