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List of professional services firms in Michigan

Tamtam tracks 172 professional services firms headquartered in Michigan. This list ranks the 50 largest by number of employees on LinkedIn, led by Gi Group, RGIS and HTC Global Services. Their median headcount is 1,315. Half of them were founded in 1983 or later. The most common headquarters are Troy (12), Detroit (10) and Ann Arbor (4).

馃嚭馃嚫 Michigan50 companiesUpdated Nov 11, 2026

This selection of professional services firms in Michigan includes several large, established companies, many of which provide IT services, business consulting, or specialized staffing and educational support. For example, HTC Global Services and Atos Syntel offer IT and business process services, while Kelly Education and Edustaff specialize in educational staffing. RGIS provides retail merchandising services, and Plante Moran is a professional services firm focusing on audit, tax, consulting, and wealth management.

A notable pattern among these firms is the strong presence of companies catering to the automotive industry, such as MSX International and Caresoft Global, reflecting Michigan's industrial heritage. There is also a concentration of headquarters in cities like Troy, Ann Arbor, and Detroit.

#CompanyIndustryHeadquarters EmployeesFounded
1
Gi Groupgigroup.com

Providing temporary, permanent, professional staffing, executive search, outsourcing, training, outplacement, and HR consultancy services worldwide across multiple industries.

Staffing and Recruiting 馃嚭馃嚫 Milan 17,915 n/a
2
RGISrgis.com

A global provider of accurate inventories and quality retail merchandising services, with nation-wide coverage and a passion for client satisfaction

Retail 馃嚭馃嚫 Birmingham 12,544 1958
3
HTC Global Serviceshtcinc.com

Provider of IT and business process services using emerging technologies to enable clients' digital transformation and sustainable growth.

IT Services and IT Consulting 馃嚭馃嚫 Troy 10,143 1990
4
Kelly Educationkellyeducation.com

A leading workforce solutions company in education, specializing in placing talent from early childhood to higher education, including leadership roles

Education Administration Programs 馃嚭馃嚫 Troy 9,490 1997
5
Atos Syntelatos-syntel.net

Providing integrated IT and knowledge process services, focusing on automation, agile, cloud, analytics, IoT, and long-term client partnerships.

IT Services and IT Consulting 馃嚭馃嚫 Troy 6,789 n/a
6
Edustaffedustaff.org

An educational staffing company providing consolidated HR services to school districts, committed to innovation, excellence, and leaving a positive impact

Education Administration Programs 馃嚭馃嚫 Grand Rapids 6,116 n/a
7
Plante Moranplantemoran.com

Professional services firm specializing in audit, tax, consulting, and wealth management with a strong focus on client relationships and support.

Accounting 馃嚭馃嚫 Southfield 4,664 1924
8
MSX Internationalmsxi.com

This company partners with automotive OEMs and mobility companies, providing support in retail strategies, dealer performance, repair optimization, and consumer engagement

Business Consulting and Services 馃嚭馃嚫 Detroit 4,448 n/a
9
NSFnsf.org

Protects and improves human health and the environment. Facilitates standards, certifies products, tests, audits, educates, and manages risks for global public health.

Public Safety 馃嚭馃嚫 Ann Arbor 3,397 1944
10
MMSmmsholdings.com

A global CRO specializing in clinical research services for pharmaceutical and biotech companies, focused on innovation, quality, and delivering life-changing therapies

Pharmaceutical Manufacturing 馃嚭馃嚫 Canton 3,136 2006
11
Miracle Software Systems, Incmiraclesoft.com

Global IT services company delivering innovative solutions across Cloud, Application Development, Automation, Data Analytics, Integration, Cognitive, and Digital Experience technologies with strategic partnerships

IT Services and IT Consulting 馃嚭馃嚫 Novi 2,689 1994
12
Project Worldwideproject.com

Creative alliance combining multiple agencies focused on ambitious collaboration and meaningful work through hyperconnected creativity and diverse marketing expertise.

Advertising Services 馃嚭馃嚫 Auburn Hills 2,678 n/a
13
PINKERTON | Comprehensive Risk Managementpinkerton.com

A global provider of security and risk management solutions with a strong reputation, offering a wide range of services worldwide

Security and Investigations 馃嚭馃嚫 Ann Arbor 2,119 1850
14
SmithGroupsmithgroup.com

Innovative design & engineering firm using research, technology, and design thinking to tackle challenges in architecture, engineering, and environmental science globally

Architecture and Planning 馃嚭馃嚫 Detroit 1,926 1853
15
Caresoft Globalcaresoftglobal.com

Global engineering solutions company partnering with automotive and equipment manufacturers to address product development, cost optimization, manufacturing, and aftermarket needs with specialized expertise and experience

Business Consulting and Services 馃嚭馃嚫 Livonia 1,820 n/a
16
George P Johnson Experience Marketinggpj.com

Strategic experience marketing agency creating integrated experiential programs through digital, mobile, and physical brand activations to accelerate relationships with customers and industry influencers.

Advertising Services 馃嚭馃嚫 Auburn Hills 1,722 1914
17
Atwell, LLCatwell.com

Full-service consulting, engineering, and construction firm providing customized solutions for real estate, land development, power, energy, and oil markets.

Civil Engineering 馃嚭馃嚫 Southfield 1,673 n/a
18
Infotree Global Solutionsinfotreeglobal.com

Connecting top talent with leading companies globally, specializing in IT, engineering, clinical, skilled trades, finance, and accounting sectors.

Staffing and Recruiting 馃嚭馃嚫 Plymouth 1,627 2002
19
Creative Synergies Groupglobal-csg.com

A leading digital innovation solution provider, leveraging expertise and NextGen technologies to empower global customers in Industry 40 revolution

IT Services and IT Consulting 馃嚭馃嚫 Okemos 1,617 2011
20
Clark Hill Lawclarkhill.com

A diverse and talented team at the forefront of legal services, partnering with clients to achieve their business objectives in varied locations

Law Practice 馃嚭馃嚫 Detroit 1,579 1890
21
KellyOCGkellyocg.com

Global advisor of talent supply chain strategies and workforce solutions, aligning talent strategy with business goals to help companies and careers thrive

Business Consulting and Services 馃嚭馃嚫 Troy 1,544 n/a
22
Rehmannrehmann.com

A professional advisory firm offering accounting, assurance, business solutions, specialized consulting, and wealth management services with over 80 years of experience

Financial Services 馃嚭馃嚫 Troy 1,415 1941
23
Kelly Science, Engineering, Technology & Telecomset.kellyservices.us

Helping companies adapt and succeed through their people, Kelly Science, Engineering and Technology provides innovative solutions for success

Staffing and Recruiting 馃嚭馃嚫 Troy 1,412 n/a
24
The Private Firmthefirm.net

The Private Firm provides experienced legal services to business owners, executives, and managers, helping them navigate opportunities, overcome difficulties, and achieve their goals

Legal Services 馃嚭馃嚫 Rochester 1,354 2020
25
Escalentescalent.co

A data analytics and advisory firm guiding leading brands in various industries through market insights to drive growth and transformation

Market Research 馃嚭馃嚫 Livonia 1,315 n/a

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26
Netlink Software Group America Incnetlink.com

A global technology services provider delivering innovative solutions in automation, ERP, BI & analytics, AI, cloud, mobility, BPO, ESG management, and more

IT Services and IT Consulting 馃嚭馃嚫 Madison Heights 1,309 1998
27
ICONMAiconma.com

A woman-owned staffing company providing professional staffing services, project-based solutions, and a wide range of expertise to Fortune 500 organizations globally

Staffing and Recruiting 馃嚭馃嚫 Troy 1,272 2000
28
CCI Systemsccisystems.com

An employee-owned solution provider offering telecommunications solutions, network assessments, engineering, drafting, design services, and 24/7 support to achieve strategic goals

Telecommunications 馃嚭馃嚫 Iron Mountain 1,256 n/a
29
Dickinson Wrightdickinson-wright.com

A full-service legal firm with over 500 lawyers, offering unmatched client service and high-quality advice in 40 practice areas globally

Law Practice 馃嚭馃嚫 Detroit 1,243 1878
30
Second To Nonesecond-to-none.com

Empowering customer-centric companies to create authentic experiences through mystery shopping, compliance, and voice of customer solutions for diverse sectors

Market Research 馃嚭馃嚫 Ann Arbor 1,223 1989
31
Strategic Staffing Solutionsstrategicstaff.com

A global IT consulting and business services corporation offering staff augmentation, managed services, workforce management, and recruiting with industry expertise

IT Services and IT Consulting 馃嚭馃嚫 Detroit 1,205 1990
32
RGBSIrgbsi.com

Delivering engineering and quality solutions globally, bridging strategy and execution with in-house technologies to enhance performance and drive innovation

Engineering Services 馃嚭馃嚫 Troy 1,198 1997
33
Global LT, Inc.global-lt.com

A leading expert in Language Solutions and Expatriate Services, offering training, translation, interpretation, and destination services worldwide since 1979

Education Administration Programs 馃嚭馃嚫 Troy 1,098 1979
34
GalaxE.Solutionsinfo.endava.com

Global professional services company offering a variety of services under well-known brands, focused on outsourcing and technology solutions

IT Services and IT Consulting 馃嚭馃嚫 Detroit 1,092 1990
35
Altran Engineering Solutionsaltranengineeringsolutions.com

Global engineering solutions provider offering services in transportation, consumer, industrial, and medical sectors Specializing in embedded systems, design, prototyping, testing, and manufacturing

Motor Vehicle Manufacturing 馃嚭馃嚫 Livonia 1,090 2006
36
Production Modeling Corporation (PMC)pmcorp.com

Since 1979, PMC has provided expert software, consulting, training, support, and staffing solutions for operations, engineering, supply chain management, and more

Business Consulting and Services 馃嚭馃嚫 Dearborn 931 1979
37
Doeren Mayhewdoeren.com

Professionals providing guidance and direction to businesses and nonprofit organizations to traverse complex business terrain. Offers audit, tax, and business consulting services.

Accounting 馃嚭馃嚫 Troy 929 1932
38
EDSIedsi.com

A national workforce development, training, and consulting company helping individuals and organizations transition to employment and self-sufficiency, with over 45 years of experience

Professional Training and Coaching 馃嚭馃嚫 Dearborn 911 1979
39
Honigman LLPhonigman.com

Leading business law firm with extensive experience counseling clients in various legal areas, known for innovative approaches, exceptional client service, and top-tier practice rankings

Law Practice 馃嚭馃嚫 Detroit 892 1948
40
Health Management Associateshealthmanagement.com

Health Management Associates is a national research and consulting firm specializing in health care program and policy issues for various organizations

Hospitals and Health Care 馃嚭馃嚫 Okemos 882 1985
41
OneMagnifyonemagnify.com

Innovative company combining technology, creativity, and analytics to help build and transform brands that are making a global impact

Advertising Services 馃嚭馃嚫 Detroit 834 1967
42
Wade Trimwadetrim.com

The company specializes in solving engineering challenges to enhance infrastructure, create stronger communities, and deliver customized solutions with excellent communication

Civil Engineering 馃嚭馃嚫 Detroit 817 1926
43
Urban Scienceurbanscience.com

Provide scientific analysis and insights to solve automotive market challenges, helping clients improve targeting, sales, market share, and profitability.

Motor Vehicle Manufacturing 馃嚭馃嚫 Detroit 812 1977
44
Multi-Training Systems LLCmtsinfo.com

A learning organization specializing in diversity, equity, and inclusion training and consulting for individuals, teams, and organizations across various industries

Professional Training and Coaching 馃嚭馃嚫 Southfield 790 1994
45
Trillium Staffing Solutionstrilliumstaffing.com

An employment service specializing in staffing, training, on-site services, human resources, and safety consulting, dedicated to providing quality employees and service

Staffing and Recruiting 馃嚭馃嚫 Kalamazoo 779 1984
46
OHM Advisorsohm-advisors.com

AEP firm specializing in community advancement through multidisciplinary teamwork in architecture, engineering, and planning Award-winning work creating great places

Architecture and Planning 馃嚭馃嚫 Livonia 754 1962
47
TekWissen 庐tekwissen.com

Global provider of technology consulting, workforce management, and recruitment solutions with a focus on exceeding client expectations and driving innovation

IT Services and IT Consulting 馃嚭馃嚫 Ann Arbor 749 2009
48
Ghafari Associatesghafari.com

Since 1982, this company offers integrated design solutions for various sectors globally, with services in architecture, engineering, and operations

Architecture and Planning 馃嚭馃嚫 Dearborn 741 1982
49
Populus Grouppopulusgroup.com

A company specializing in managing contingent workforces, offering payroll, MSP, staffing, and recruitment services with a focus on diversity and opportunity for all

Staffing and Recruiting 馃嚭馃嚫 Troy 704 2002
50
Job Centerjobcentermichigan.com

A family-owned staffing company serving Metro Detroit and surrounding areas since 1983, specializing in temporary-to-hire placements

Human Resources Services 馃嚭馃嚫 Troy 703 1983

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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 Nov 11, 2026.

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