# Professional services firms headquartered in Minnesota

Tamtam tracks 125 professional services firms headquartered in Minnesota. This list ranks the 50 largest by number of employees on LinkedIn, led by HGA, Piper Sandler and Currently Seeking Opportunities. Their median headcount is 617. Half of them were founded in 1977 or later. The most common headquarters are Minneapolis (26), Eden Prairie (5) and Saint Paul (4).

These are some of the largest professional services firms in Minnesota, covering a range of sectors from architecture and engineering to financial services and IT consulting. The list includes established companies like Piper Sandler, an investment bank founded in 1895, and Ryan Companies US, Inc., a commercial real estate leader since 1938. Many of these firms, such as HGA and WSB, offer multidisciplinary expertise. A notable pattern is the concentration of headquarters in Minneapolis, indicating its role as a key hub for professional services in the state. Other significant locations include Mankato, St. Cloud, and St. Louis Park. The firms vary in age, with several founded in the mid-20th century, like IEA (1984), and some more recent, such as Coherent Solutions (1995).

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

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [HGA](https://www.tamtam.ai/c/hga) (hga.com)<br>National design firm specializing in architecture and engineering, creating impactful and award-winning designs for healthcare, arts, education, government, science, technology, and energy sectors | Architecture and Planning | 🇺🇸 Minneapolis | 2,141 | 1953 |
| 2 | [Piper Sandler](https://www.tamtam.ai/c/piper-sandler) (pipersandler.com)<br>A leading investment bank offering a full suite of products and services to clients globally, specializing in various sectors and geographies | Financial Services | 🇺🇸 Minneapolis | 2,127 | 1895 |
| 3 | [Currently Seeking Opportunities](https://www.tamtam.ai/c/currently-seeking-opportunities) (soladayolson.com)<br>Specializing in diverse talent acquisition, job search guidance, and facilitating relationships between businesses for mutual growth and opportunities | Graphic Design | 🇺🇸 Minneapolis | 2,080 |  |
| 4 | [AIC](https://www.tamtam.ai/c/aic-minneapolis) (innovasolutions.com)<br>A leading talent services firm providing skilled IT, Engineering, and Finance professionals to clients nationwide with a commitment to excellence and innovation | Staffing and Recruiting | 🇺🇸 Minneapolis | 1,858 | 1966 |
| 5 | [Ryan Companies US, Inc.](https://www.tamtam.ai/c/ryan-companies-us-inc) (ryancompanies.com)<br>A national leader in commercial real estate services, focused on bringing value to people, communities, and projects through collaboration and core values | Real Estate | 🇺🇸 Minneapolis | 1,841 | 1938 |
| 6 | [Coherent Solutions](https://www.tamtam.ai/c/coherent-solutions) (coherentsolutions.com)<br>A digital product engineering company with 25+ years of experience, 1000+ projects completed, and 95% client retention, empowering business success globally | Software Development | 🇺🇸 St. Louis Park | 1,706 | 1995 |
| 7 | [WSB](https://www.tamtam.ai/c/wsb) (wsbeng.com)<br>A design and consulting firm offering engineering, planning, environmental, and construction services with over 1,100 staff nationwide, connecting dreams to reality | Civil Engineering | 🇺🇸 Minneapolis | 1,354 | 1995 |
| 8 | [ISG](https://www.tamtam.ai/c/isg-mankato) (isginc.com)<br>A multi-disciplinary firm with over 50 years of experience, owned by employees, serving various markets with collaboration, creativity, and diverse knowledge | Architecture and Planning | 🇺🇸 Mankato | 1,278 | 1973 |
| 9 | [IEA](https://www.tamtam.ai/c/iea) (ieasafety.com)<br>A small business specializing in environmental safety consulting for private and public organizations, focusing on indoor environments with a team of over 50 professionals | Environmental Services | 🇺🇸 Brooklyn Park | 1,235 | 1984 |
| 10 | [Marco Technologies](https://www.tamtam.ai/c/marco-technologies) (marconet.com)<br>A technology services company offering hosted/cloud services, managed IT services, business solutions, carrier services, copiers/printers, phone systems, document management, and audio/video systems | IT Services and IT Consulting | 🇺🇸 St. Cloud | 1,223 | 1973 |
| 11 | [KLDiscovery](https://www.tamtam.ai/c/kldiscovery) (kldiscovery.com)<br>Global leader providing eDiscovery, information governance, data recovery solutions for legal, corporate, government clients worldwide with data collection, processing, and document review services | Legal Services | 🇺🇸 Eden Prairie | 1,206 |  |
| 12 | [Barr Engineering Co.](https://www.tamtam.ai/c/barr-engineering-co) (barr.com)<br>Engineering and environmental consulting firm with over 1,000 experts serving diverse industries worldwide, specializing in resource development, management, and restoration EEO employer | Professional Services | 🇺🇸 Minneapolis | 1,149 | 1966 |
| 13 | [SEH](https://www.tamtam.ai/c/seh) (sehinc.com)<br>An engineering, architecture, planning, and science firm connecting clients to solutions for success in mobility, infrastructure, clean water, and more | Civil Engineering | 🇺🇸 Saint Paul | 1,099 | 1927 |
| 14 | [Bolton & Menk, Inc.](https://www.tamtam.ai/c/bolton-and-menk-inc) (bolton-menk.com)<br>A leading provider of public infrastructure solutions, offering engineering, planning, and design services to help communities across the Midwest thrive | Civil Engineering | 🇺🇸 Mankato | 1,074 | 1949 |
| 15 | [QSI](https://www.tamtam.ai/c/qsi) (qsiinfo.com)<br>Specialized IT staffing solutions provider in Minneapolis, offering tailored services and top local talent to help companies thrive in the technology-driven market | IT Services and IT Consulting | 🇺🇸 Golden Valley | 1,062 | 1995 |
| 16 | [Braun Intertec Corporation](https://www.tamtam.ai/c/braun-intertec-corporation) (braunintertec.com)<br>Employee-owned geotechnical engineering, environmental consulting, and testing firm with over 1,000 employee-owners promoting wellness and a culture of ownership | Civil Engineering | 🇺🇸 Minneapolis | 1,041 | 1957 |
| 17 | [NELSON Worldwide](https://www.tamtam.ai/c/nelson-worldwide) (nelsonworldwide.com)<br>An award-winning firm providing architecture, interior design, graphic design, and brand strategy services to transform the human experience and environments globally | Design Services | 🇺🇸 Minneapolis | 1,013 | 1977 |
| 18 | [phData](https://www.tamtam.ai/c/phdata) (phdata.io)<br>Specializing in Snowflake and modern data technologies, we provide end-to-end services for data products, platforms, machine learning, and data analytics support | IT Services and IT Consulting | 🇺🇸 Minneapolis | 876 | 2014 |
| 19 | [U.S. Bancorp Advisors](https://www.tamtam.ai/c/u-s-bancorp-advisors) (usbank.com)<br>Offering a wide range of financial services including investment advisory, insurance, and merger & acquisition advisory, tailored to help clients achieve their financial goals | Financial Services | 🇺🇸 Saint Paul | 875 |  |
| 20 | [Fredrikson & Byron, P.A.](https://www.tamtam.ai/c/fredrikson-and-byron-p-a) (fredlaw.com)<br>A firm specializing in legal services with a focus on business acumen, proactive problem-solving, and strategic partnerships to meet client objectives | Law Practice | 🇺🇸 Minneapolis | 867 | 1948 |
| 21 | [Concord](https://www.tamtam.ai/c/concord) (concordusa.com)<br>Technology consultancy creating seamless customer experiences with strong analytics and data foundations to accelerate business value through technology integration, optimization, and activation | IT Services and IT Consulting | 🇺🇸 Minneapolis | 746 | 2003 |
| 22 | [United Language Group](https://www.tamtam.ai/c/united-language-group) (propio.com)<br>A global translation and interpretation company with expertise in over 200 languages, serving various industries using cutting-edge technology and linguistic skills | Translation and Localization | 🇺🇸 Minneapolis | 684 | 2016 |
| 23 | [Wunderlich-Malec Engineering, Inc.](https://www.tamtam.ai/c/wunderlich-malec-engineering-inc) (wmeng.com)<br>An established engineering company specializing in solutions for industrial process plants, offering expertise, experience, and resources for critical control systems | Engineering Services | 🇺🇸 Eden Prairie | 661 | 1981 |
| 24 | [RSP Architects](https://www.tamtam.ai/c/rsp-architects) (rsparch.com)<br>This company is a team of designers and architects who provide a wide range of services to clients in various industries globally | Architecture and Planning | 🇺🇸 Minneapolis | 633 | 1978 |
| 25 | [Antea Group USA](https://www.tamtam.ai/c/antea-group-usa) (anteagroup.es)<br>An international firm specializing in engineering & environmental consulting, offering solutions in EHS, sustainability, and more to clients worldwide | Environmental Services | 🇺🇸 Saint Paul | 617 |  |
| 26 | [Strom Engineering](https://www.tamtam.ai/c/strom-engineering) (stromengineering.com)<br>This company provides contingency planning and temporary replacement workforce services for organizations facing potential labor disruptions, such as union strikes | Staffing and Recruiting | 🇺🇸 Minnetonka | 602 | 1961 |
| 27 | [Horizontal Talent](https://www.tamtam.ai/c/horizontal-talent) (horizontaltalent.com)<br>A staffing company that matches talent with businesses, offering services in direct hire, staff augmentation, and project teams for IT, marketing, and business roles | Staffing and Recruiting | 🇺🇸 St. Louis Park | 592 | 2003 |
| 28 | [Ovative Group](https://www.tamtam.ai/c/ovative-group) (ovative.com)<br>A digital-first media and measurement firm transforming marketing success with Paid and Owned Media Services, Omni-Channel Measurement, and Strategy Consulting | Advertising Services | 🇺🇸 Minneapolis | 587 | 2009 |
| 29 | [Bowman and Brooke](https://www.tamtam.ai/c/bowman-and-brooke) (bowmanandbrooke.com)<br>National trial firm specializing in product liability defense for Global 500 companies, with over 150 attorneys and offices across the US | Law Practice | 🇺🇸 Minneapolis | 575 | 1985 |
| 30 | [NetSPI](https://www.tamtam.ai/c/netspi) (netspi.com)<br>Pioneered penetration testing as a service, combining security professionals with AI and automation to deliver clarity, speed, and scale across various pentest types. | Computer and Network Security | 🇺🇸 Minneapolis | 574 | 2001 |
| 31 | [Piper Jaffray](https://www.tamtam.ai/c/piper-jaffray) (pipersandler.com)<br>A leading investment bank and institutional securities firm offering a full suite of products, deep expertise in core sectors, and global reach | Financial Services | 🇺🇸 Minneapolis | 559 | 1895 |
| 32 | [Masterson Staffing Solutions](https://www.tamtam.ai/c/masterson-staffing-solutions) (mastersonstaffing.com)<br>A premier staffing solutions provider with nearly 40 branches across the Midwest connecting talented workers with great companies for mutual success and growth | Staffing and Recruiting | 🇺🇸 Plymouth | 531 | 1968 |
| 33 | [Abdo](https://www.tamtam.ai/c/abdo) (abdosolutions.com)<br>Full-service accounting and consulting firm providing customized strategies and innovative solutions to help organizations and businesses achieve success. | Accounting | 🇺🇸 Edina | 527 | 1963 |
| 34 | [Robins Kaplan LLP](https://www.tamtam.ai/c/robins-kaplan-llp) (robinskaplan.com)<br>A premier trial law firm with over 250 attorneys in eight cities, specializing in litigating, mediating, and arbitrating disputes for clients to achieve business results | Legal Services | 🇺🇸 Minneapolis | 525 | 1938 |
| 35 | [Horizontal Digital](https://www.tamtam.ai/c/horizontal-digital) (horizontaldigital.com)<br>Experience forward consultancy leveraging customer data to drive personalized digital engagements Diversity-focused, with US and global presence Founded in 2003 | IT Services and IT Consulting | 🇺🇸 St. Louis Park | 519 | 2003 |
| 36 | [MentorMate](https://www.tamtam.ai/c/mentormate) (mentormate.com)<br>Providing strategic insights, design, and engineering services since 2001 to deliver digital transformation and secure solutions for global companies | IT Services and IT Consulting | 🇺🇸 Minneapolis | 499 | 2001 |
| 37 | [SitelogIQ](https://www.tamtam.ai/c/sitelogiq) (sitelogiq.com)<br>Energy efficiency and facility solutions provider improving buildings for residential, educational, healthcare, commercial, and retail spaces to enhance comfort and productivity | Engineering Services | 🇺🇸 Minneapolis | 490 |  |
| 38 | [Opus](https://www.tamtam.ai/c/opus) (opus-group.com)<br>Integrated team with expertise in real estate development, construction, design, and project management, delivering solutions for various commercial projects | Real Estate | 🇺🇸 Minneapolis | 487 | 2010 |
| 39 | [SRF Consulting Group](https://www.tamtam.ai/c/srf-consulting-group) (srfconsulting.com)<br>A full-service consulting firm offering award-winning services in transportation planning, engineering, landscape architecture, project controls, and more across the Midwest | Civil Engineering | 🇺🇸 Minneapolis | 473 | 1961 |
| 40 | [TKDA](https://www.tamtam.ai/c/tkda) (tkda.com)<br>A 100% employee-owned firm offering engineering, architecture, planning, and specialized expertise to solve client challenges in industrial, transportation, building, and water markets | Civil Engineering | 🇺🇸 Bloomington | 466 | 1910 |
| 41 | [Logic, Part of Accenture](https://www.tamtam.ai/c/logic-part-of-accenture) (logicinfo.com)<br>Consulting for leading retailers focusing on strategy, technology, customer loyalty, revenue growth, and competitive advantage through proven methodologies. | IT Services and IT Consulting | 🇺🇸 Bloomington | 463 | 1997 |
| 42 | [RFA Engineering](https://www.tamtam.ai/c/rfa-engineering) (rfamec.com)<br>Engineering services company serving Fortune 500 to start-ups, providing mechanical, software, and electrical design for various industries with a focus on client satisfaction | Engineering Services | 🇺🇸 Eden Prairie | 462 | 1961 |
| 43 | [Marsh McLennan Agency - Upper Midwest](https://www.tamtam.ai/c/marsh-mclennan-agency-upper-midwest) (marshmma.com)<br>A leading brokerage agency offering business insurance, employee benefits, retirement planning, and private client insurance solutions across the US and Canada | Insurance | 🇺🇸 Minneapolis | 449 |  |
| 44 | [SRM](https://www.tamtam.ai/c/srm-minneapolis) (srmallc.net)<br>This company helps banks and manufacturers manage credit risk by establishing credit policies and training staff to recognize portfolio risks accurately | Financial Services | 🇺🇸 Minneapolis | 448 | 1989 |
| 45 | [R3 Continuum](https://www.tamtam.ai/c/r3-continuum) (r3c.com)<br>Leader in tailored behavioral health solutions for workplace well-being, culture, and performance, empowering individuals and organizations to thrive and grow | Mental Health Care | 🇺🇸 Bloomington | 447 | 1988 |
| 46 | [Salo, a Korn Ferry company](https://www.tamtam.ai/c/salo-a-korn-ferry-company) (kornferry.com)<br>A company specializing in staff consulting and talent acquisition services, having joined forces with Korn Ferry to enhance its offerings | Staffing and Recruiting | 🇺🇸 Minneapolis | 440 |  |
| 47 | [Boulay](https://www.tamtam.ai/c/boulay) (boulaygroup.com)<br>A company offering strategic accounting, tax, business planning, and wealth management services to help clients achieve financial success and reach their goals | Accounting | 🇺🇸 Eden Prairie | 437 | 1934 |
| 48 | [EVS, Inc.](https://www.tamtam.ai/c/evs-inc) (evs-eng.com)<br>Established in 1979, an engineering firm specializing in renewable energy Providing services for utility-scale solar plants, substations, and energy storage facilities nationwide | Engineering Services | 🇺🇸 Eden Prairie | 433 | 1979 |
| 49 | [Nihilent Technologies Inc](https://www.tamtam.ai/c/nihilent-technologies-inc) (nihilent.com)<br>Stay updated on all things #Nihilent by following our consolidated LinkedIn company page for information on our services and offerings | IT Services and IT Consulting | 🇺🇸 Roseville | 421 | 2005 |
| 50 | [AET](https://www.tamtam.ai/c/aet) (teamaet.com)<br>Employee-owned consulting engineering company providing geotechnical, environmental, and materials engineering services nationwide, with expertise in building forensics and nondestructive testing | Civil Engineering | 🇺🇸 Saint Paul | 401 | 1971 |

## 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-minnesota