# The 50 largest professional services firms in Missouri

Tamtam tracks 84 professional services firms headquartered in Missouri. This list ranks the 50 largest by number of employees on LinkedIn, led by Edward Jones, Burns & McDonnell and Wells Fargo Advisors. Their median headcount is 615. Half of them were founded in 1986 or later. The most common headquarters are St. Louis (24), Kansas City (15) and Springfield (3).

These are professional services firms in Missouri, mostly large and mid-sized companies with a strong presence in financial services, construction, and legal practices. Edward Jones provides personalized financial advisory services, while Burns & McDonnell specializes in engineering and construction. Wells Fargo Advisors offers investment guidance and wealth management, and Perficient focuses on digital transformation consultancy. Other notable firms include Rose International for staffing and recruiting and CRB for sustainable engineering solutions.

A significant cluster of these companies, particularly in financial services and law, have their headquarters in St. Louis and Kansas City. Many of these firms were established in the late 19th and early 20th centuries, indicating a long-standing history of professional services in the region, with some newer companies like Block Advisors (founded 2015) also present.

🇺🇸 Missouri · 50 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Edward Jones](https://www.tamtam.ai/c/edward-jones-st-louis) (edwardjones.com)<br>Provides personalized financial advisory and investment services through a large network of advisors to help clients achieve financial goals. | Financial Services | 🇺🇸 St. Louis | 45,845 | 1922 |
| 2 | [Burns & McDonnell](https://www.tamtam.ai/c/burns-and-mcdonnell) (burnsmcd.com)<br>Engineering, construction, architecture, planning, and community engagement with a strong ownership mentality and commitment to client success and safety. | Construction | 🇺🇸 Kansas City | 16,200 |  |
| 3 | [Wells Fargo Advisors](https://www.tamtam.ai/c/wells-fargo-advisors) (wellsfargoadvisors.com)<br>Financial advisors providing professional investment guidance and wealth management services across fifty states to help clients achieve long-term success through complex planning. | Financial Services | 🇺🇸 St. Louis | 14,935 |  |
| 4 | [Perficient](https://www.tamtam.ai/c/perficient) (perficient.com)<br>Global consultancy specializing in digital transformation for large enterprises, offering strategy, creative, and technology solutions to drive business growth and success | IT Services and IT Consulting | 🇺🇸 St Louis | 4,362 |  |
| 5 | [Giancarlo Spaggiari Ingegnere - Studio Professionale](https://www.tamtam.ai/c/giancarlo-spaggiari-ingegnere-studio-professionale) (gsistudio.it)<br>The company provides independent evaluation services in various sectors including real estate, infrastructure, urban planning, workplace accidents, energy efficiency, and more | Leasing Non-residential Real Estate | 🇺🇸 Limidi di Soliera | 2,945 | 1985 |
| 6 | [Rose International](https://www.tamtam.ai/c/rose-international) (roseint.com)<br>Provides staffing and total talent solutions across various industries, offering challenging assignments to skilled professionals for corporations and government agencies. | Staffing and Recruiting | 🇺🇸 Chesterfield | 2,270 | 1993 |
| 7 | [CRB](https://www.tamtam.ai/c/crb) (crbgroup.com)<br>A leading provider of sustainable engineering, architecture, construction, and consulting solutions to global life sciences and food & beverage industries | Construction | 🇺🇸 Kansas City | 2,008 | 1984 |
| 8 | [BW Design Group](https://www.tamtam.ai/c/bw-design-group) (bwdesigngroup.com)<br>This company is a fully integrated engineering, architecture, construction, and consulting firm serving leading companies with customized solutions | Engineering Services | 🇺🇸 St. Louis | 1,676 | 1986 |
| 9 | [Shook, Hardy & Bacon L.L.P.](https://www.tamtam.ai/c/shook-hardy-and-bacon-l-l-p) (shb.com)<br>A leading litigation firm with expertise in product liability, mass tort, intellectual property, environmental law, employment litigation, commercial litigation, and public policy | Law Practice | 🇺🇸 Kansas City | 1,563 | 1889 |
| 10 | [Block Advisors](https://www.tamtam.ai/c/block-advisors) (blockadvisors.com)<br>Tax professionals at this company help small business owners maximize credits and deductions with year-round tax preparation services and 100% accuracy guaranteed | Financial Services | 🇺🇸 Kansas City | 1,497 | 2015 |
| 11 | [Spencer Fane LLP](https://www.tamtam.ai/c/spencer-fane-llp) (spencerfane.com)<br>A law firm offering unconventional legal services to protect and advance business and personal interests, led by decisive and purposeful leaders | Law Practice | 🇺🇸 Kansas City | 1,139 | 1879 |
| 12 | [BKD CPAs & Advisors](https://www.tamtam.ai/c/bkd-cpas-and-advisors) (forvismazars.us)<br>Top-tier CPA and advisory firm providing comprehensive services including risk management, technology, wealth management, and forensic and valuation services to clients globally | Accounting | 🇺🇸 Springfield | 1,068 |  |
| 13 | [RubinBrown LLP](https://www.tamtam.ai/c/rubinbrown-llp) (rubinbrown.com)<br>Offering unmatched service to various sectors, we provide expert accounting and consulting services to help clients build and protect value | Accounting | 🇺🇸 St. Louis | 1,057 | 1952 |
| 14 | [Thompson Coburn LLP](https://www.tamtam.ai/c/thompson-coburn-llp) (thompsoncoburn.com)<br>Full-service law firm with offices nationwide, serving Fortune 500 to emerging companies across various industries with industry-specific expertise and exceptional client service | Law Practice | 🇺🇸 St. Louis | 1,030 |  |
| 15 | [Bryan Cave](https://www.tamtam.ai/c/bryan-cave) (bryancave.com)<br>Global law firm with 1,600 lawyers in 32 offices offering clients integrated legal advice, specializing in M&A, real estate, financial services, litigation, and corporate risk practices | Law Practice | 🇺🇸 St. Louis | 984 | 1873 |
| 16 | [Myers and Stauffer LC](https://www.tamtam.ai/c/myers-and-stauffer-lc) (myersandstauffer.com)<br>Specializing in accounting, consulting, and data analysis for state and federal agencies managing government health care programs, with expertise in reimbursement issues and program integrity | Accounting | 🇺🇸 Kansas City | 923 | 1977 |
| 17 | [Penmac Staffing Services, Inc.](https://www.tamtam.ai/c/penmac-staffing-services-inc) (penmac.com)<br>A staffing service offering temporary and long-term staffing, human resource services, payroll administration, benefits, screenings, and pre-employment assessments | Staffing and Recruiting | 🇺🇸 Springfield | 893 | 1988 |
| 18 | [TranSystems](https://www.tamtam.ai/c/transystems) (transystems.com)<br>Transportation and infrastructure consulting firm enhancing communities with innovative planning, design, and construction solutions from professionals across the US | Civil Engineering | 🇺🇸 Kansas City | 819 |  |
| 19 | [Frontline Managed Services](https://www.tamtam.ai/c/frontline-managed-services) (frontlinems.com)<br>A global provider offering outsourced solutions in IT, Financial & Administrative Managed Services for legal and accounting markets, driving financial success through innovation | Legal Services | 🇺🇸 St. Louis | 806 | 1998 |
| 20 | [Introba](https://www.tamtam.ai/c/introba) (introba.com)<br>Global building engineering firm transforming the built environment with digital solutions, sustainability strategies, and innovative designs to create smart, resilient spaces | Design Services | 🇺🇸 St. Louis | 790 |  |
| 21 | [Electric Power Systems](https://www.tamtam.ai/c/electric-power-systems) (asplundhpower.com)<br>An independent electrical testing & engineering organization specializing in commissioning, start up, and maintenance testing for various facilities globally | Utilities | 🇺🇸 Maryland Heights | 741 | 1977 |
| 22 | [Roeslein & Associates](https://www.tamtam.ai/c/roeslein-and-associates) (roeslein.com)<br>A global leader in engineering, procurement, and construction services, specializing in modularized plant facilities for various industries worldwide | Construction | 🇺🇸 St. Louis | 709 | 1990 |
| 23 | [Abstrakt Marketing Group](https://www.tamtam.ai/c/abstrakt-marketing-group) (abstraktmg.com)<br>Provides sales appointment setting, inbound marketing, SEO, creative services, video production, Salesforce consulting, and talent solutions for business growth. | Advertising Services | 🇺🇸 St. Louis | 692 | 2009 |
| 24 | [1898 & Co.](https://www.tamtam.ai/c/1898-and-co) (1898andco.burnsmcd.com)<br>A business and technology consultancy specializing in critical infrastructure industries, providing strategic insight, efficiency, innovation, and data-driven solutions for clients | Business Consulting and Services | 🇺🇸 Kansas City | 638 |  |
| 25 | [Gemini Consulting & Services](https://www.tamtam.ai/c/gemini-consulting-and-services) (gemini-us.com)<br>Providing technology solutions including ERP, cloud migration, and analytics to help businesses accelerate digital transformation and improve operations. | IT Services and IT Consulting | 🇺🇸 St. Louis | 615 | 2010 |
| 26 | [Armstrong Teasdale](https://www.tamtam.ai/c/armstrong-teasdale) (armstrongteasdale.com)<br>A global law firm founded in 1901, providing legal services to clients around the world with a focus on long-term relationships | Law Practice | 🇺🇸 St. Louis | 612 | 1901 |
| 27 | [The Resource Group, Spend Management Solutions](https://www.tamtam.ai/c/the-resource-group-spend-management-solutions) (theresourcegroup.com)<br>Specializing in non-payroll spend management, The Resource Group focuses on sustainable processes, change management, sourcing, analytics, and process improvement to lower healthcare costs | Hospitals and Health Care | 🇺🇸 St. Louis | 603 | 2009 |
| 28 | [IMPACT Group](https://www.tamtam.ai/c/impact-group-saint-louis) (impactgrouphr.com)<br>Specializing in career transitions, relocation support, and outplacement services, we empower employees with the tools they need to succeed in their careers | Human Resources Services | 🇺🇸 St. Louis | 579 | 1988 |
| 29 | [Tepa Companies](https://www.tamtam.ai/c/tepa-companies) (tepa.com)<br>A shared services organization providing leadership and management to various small businesses, offering construction, engineering, environmental, industrial, and technology services | Business Consulting and Services | 🇺🇸 Kansas City | 552 | 2005 |
| 30 | [Daugherty Business Solutions](https://www.tamtam.ai/c/daugherty-business-solutions) (careers.daugherty.com)<br>A global consultancy firm with expertise in technology and business solutions, focusing on driving growth and fostering relationships within diverse industries | IT Services and IT Consulting | 🇺🇸 St. Louis | 518 | 1985 |
| 31 | [NCM Associates](https://www.tamtam.ai/c/ncm-associates) (ncmassociates.com)<br>This company helps dealerships and businesses enhance profitability with business analysis tools, peer collaboration, 20 Group process, and consulting services | Professional Training and Coaching | 🇺🇸 Kansas City | 468 | 1947 |
| 32 | [Rem and Company](https://www.tamtam.ai/c/rem-and-company) (remandcompany.com)<br>Provides free consulting services to small businesses affected by COVID-19 as a social impact initiative | Business Consulting and Services | 🇺🇸 St. Louis | 462 | 2020 |
| 33 | [Valorem Reply](https://www.tamtam.ai/c/valorem-reply) (valoremreply.com)<br>A leading digital transformation firm providing innovative solutions in IT modernization, data & AI, security, product transformation, and digital workplace services | IT Services and IT Consulting | 🇺🇸 Kansas City | 450 | 2009 |
| 34 | [Cordell & Cordell](https://www.tamtam.ai/c/cordell-and-cordell) (cordellcordell.com)<br>A community of legal professionals prioritizing personal growth and client success by providing high-quality representation with care and excellence | Law Practice | 🇺🇸 Town and Country | 420 | 1990 |
| 35 | [Tetrasoft Inc.](https://www.tamtam.ai/c/tetrasoft-inc) (tetrasoft.us)<br>A global digital services company specializing in innovative solutions for industries such as healthcare, insurance, and manufacturing using disruptive technologies and strategies | IT Services and IT Consulting | 🇺🇸 Chesterfield | 416 | 1997 |
| 36 | [Object Computing, Inc.](https://www.tamtam.ai/c/object-computing-inc) (objectcomputing.com)<br>A modern consulting company using technology to create business solutions, accelerate outcomes, and leverage cutting-edge technologies like blockchain, machine learning, and IoT | IT Services and IT Consulting | 🇺🇸 St. Louis | 394 | 1993 |
| 37 | [Sandberg Phoenix](https://www.tamtam.ai/c/sandberg-phoenix) (sandbergphoenix.com)<br>A top law firm in the Midwest providing superior legal services in Business Law, Litigation, Health Law, Intellectual Property, and Products Liability nationwide | Law Practice | 🇺🇸 St. Louis | 392 | 1979 |
| 38 | [Sullivan Higdon & Sink](https://www.tamtam.ai/c/sullivan-higdon-and-sink) (signaltheory.com)<br>Award-winning marketing agency specializing in creating standout brand experiences through human-centered design Focus areas include food and animal health industries | Advertising Services | 🇺🇸 Kansas City | 377 | 1971 |
| 39 | [IMKO Workforce Solutions](https://www.tamtam.ai/c/imko-workforce-solutions) (imko.com)<br>A national employment agency offering temporary, temp-to-hire, direct placement, and onsite solutions for light industrial and clerical recruitment needs | Staffing and Recruiting | 🇺🇸 St. Joseph | 366 | 1972 |
| 40 | [Anders CPAs + Advisors](https://www.tamtam.ai/c/anders-cpas-advisors) (anderscpa.com)<br>A team of CPAs and industry advisors providing tax, audit, and advisory services to help clients achieve their goals and highest potential | Accounting | 🇺🇸 St. Louis | 360 | 1965 |
| 41 | [Conexon, LLC](https://www.tamtam.ai/c/conexon-llc) (conexon.us)<br>A company that collaborates with Rural Electric Cooperatives to bring fiber optic infrastructure to rural communities, providing comprehensive support from planning to sustainability | Telecommunications | 🇺🇸 Kansas City | 346 | 2015 |
| 42 | [Lineal](https://www.tamtam.ai/c/lineal) (lineal.com)<br>Innovative eDiscovery and legal technology solutions company specializing in data management, review strategies, and custom-tailored solutions for law firms and corporations globally | Legal Services | 🇺🇸 North Kansas City | 345 | 2009 |
| 43 | [Lewis Rice LLC](https://www.tamtam.ai/c/lewis-rice-llc) (lewisrice.com)<br>A leading regional law firm with 150+ diverse lawyers offering comprehensive legal services to businesses, individuals, and organizations for over a century | Law Practice | 🇺🇸 St. Louis | 340 | 1909 |
| 44 | [Cascade Health Services](https://www.tamtam.ai/c/cascade-health-services) (cascadestaff.com)<br>Midwest-based provider of medical, therapy, and support staff for healthcare facilities Offers 24/7 staffing solutions with experienced professionals and comprehensive benefits package | Staffing and Recruiting | 🇺🇸 Kansas City | 339 | 1988 |
| 45 | [UB Greensfelder](https://www.tamtam.ai/c/ub-greensfelder) (ubglaw.com)<br>A full-service, super-regional law organization providing customized legal solutions to businesses globally with expertise in various practice areas and industries | Law Practice | 🇺🇸 St. Louis | 334 |  |
| 46 | [QUES](https://www.tamtam.ai/c/ques) (ques.com)<br>A unified brand within Quanta Services offering distribution, transmission, substation, engineering, asset management, and professional services in North America and globally | Utilities | 🇺🇸 Kansas City | 326 | 2002 |
| 47 | [KellyMitchell Group](https://www.tamtam.ai/c/kellymitchell-group) (kellymitchell.com)<br>An award-winning IT staffing and services provider, connecting professionals with opportunities and helping companies achieve their innovation goals nationwide | IT Services and IT Consulting | 🇺🇸 St. Louis | 319 | 1998 |
| 48 | [NewGround](https://www.tamtam.ai/c/newground-st-louis) (newground.com)<br>NewGround International specializes in planning, designing, and building innovative, branded spaces to accelerate growth and transform industry standards for clients | Architecture and Planning | 🇺🇸 St. Louis | 283 | 1913 |
| 49 | [KAI Enterprises](https://www.tamtam.ai/c/kai-enterprises) (kai-db.com)<br>A design and build enterprise with integrated services offering award-winning design and construction solutions for diverse projects nationwide | Architecture and Planning | 🇺🇸 St. Louis | 249 | 1980 |
| 50 | [OWN, Inc.](https://www.tamtam.ai/c/own-inc) (weareown.com)<br>They provide civil engineering and surveying services including planning, design, GIS, environmental assessments, surveys, drilling services, construction monitoring for various projects and clients | Civil Engineering | 🇺🇸 Springfield | 219 | 1954 |

## 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 11, 2026.

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Source: https://www.tamtam.ai/l/professional-services-firms-missouri