These Indiana-based professional services firms are predominantly large companies, with headcounts ranging from approximately 900 to over 4,000 employees. The sector is characterized by a strong presence of staffing and recruiting companies, alongside IT services, healthcare, and engineering. Elwood Staffing Services, Inc. provides job placement and workforce management solutions, while TRIMEDX specializes in clinical asset management and medical device cybersecurity. Brooksource offers engineering and technology solutions, and Barnes & Thornburg LLP provides legal services. Qualus focuses on innovative power services, and CAI provides engineering and project management to various industries.
The data reveals a significant concentration of headquarters in Indianapolis, with nine out of the fifteen largest companies located there. Other key cities include Columbus, Fishers, Carmel, and South Bend. The founding dates of these companies span from 1942 to 2009, with a notable cluster of firms established around the late 1990s and early 2000s, indicating a period of growth and development in the professional services sector in Indiana.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Elwood Staffing Services, Inc.elwoodstaffing.com
A trusted company since 1980, offering job placement and workforce management solutions including temporary, direct hire, and recruitment process outsourcing services |
4,143 | |||
| 2 |
TRIMEDXtrimedx.com
Industry-leading provider of clinical asset management, clinical engineering services, asset informatics, and medical device cybersecurity to healthcare providers Transformational, cost-effective solutions for patient care |
2,721 | |||
| 3 |
Brooksourcebrooksource.com
Trusted provider of Engineering & Technology solutions for Fortune 500 organizations, emphasizing Experience-Driven Staffing, Professional Services, and Workforce Transformation |
2,497 | |||
| 4 |
MS Companiesmscompanies.com
A data-driven technology company providing workforce solutions to OEMs and tiered suppliers, specializing in advisory, quality representation, inspection, and talent management services |
2,236 | |||
| 5 |
Barnes & Thornburg LLPbtlaw.com
Over 800 legal professionals in 23 offices provide expert legal services across disciplines, supporting businesses in a dynamic marketplace. |
2,028 | |||
| 6 |
Eight Eleven Groupeightelevengroup.com
Eight Eleven Group provides IT, engineering, healthcare, and business support services nationwide, focusing on creating great experiences for clients, consultants, and employees |
1,877 | |||
| 7 |
LGC Staffinglgcassociates.com
Dedicated team creating connections between clients and candidates, promoting diversity, inclusion, economic empowerment, and respect in staffing industry |
1,760 | |||
| 8 |
Stratosphere Qualitystratospherequality.com
Global provider of quality assurance solutions to manufacturers in automotive, medical device, electronics, home appliance, and recreational vehicle industries, helping minimize defects and reduce costs |
1,740 | |||
| 9 |
Qualusqualuscorp.com
Innovative power services firm specializing in grid modernization, resiliency, sustainability, and software solutions for utilities, commercial, industrial, and government clients |
1,668 | |||
| 10 |
BCforwardbcforward.com
Global talent community empowering job seekers worldwide to advance careers and help organizations achieve goals in various industries Headquarters in Indianapolis and Hyderabad |
1,662 | |||
| 11 |
Peoplelink Grouppeoplelinkgroup.com
A staffing group based in South Bend, IN, providing contract staff to companies nationwide Mission to link business and people, with customer-centric values |
1,205 | |||
| 12 |
ACESacespower.com
A nationwide energy management company helping clients navigate and mitigate risks in the US energy markets without owning any energy commodities |
1,194 | |||
| 13 |
CAIcaiready.com
Trusted global experts providing engineers, project managers, and technicians to efficiently startup projects, lower costs, and drive speed to patient in various industries |
1,105 | |||
| 14 |
Medasourcemedasource.com
Leading consulting and professional services provider in healthcare industry, offering services to Life Sciences, RCM/Payers, Technology, and Government sectors |
997 | |||
| 15 |
KSM (Katz, Sapper & Miller)ksmcpa.com
A nationally recognized firm offering advisory, tax, and audit services, leveraging technology and diverse perspectives to help clients thrive and innovate |
915 | |||
| 16 |
Ice Miller LLPicemiller.com
Provides comprehensive legal services with a focus on understanding client needs to build, grow, and protect valuable assets. |
891 | |||
| 17 |
American Structurepointstructurepoint.com
Providing innovative engineering, design, and consulting services across various disciplines to support projects from concept through completion. |
767 | |||
| 18 |
Blue & Co., LLCblueandco.com
Blue & Co provides a wide range of professional services including auditing, business planning, financial controls, and litigation support to help clients succeed |
626 | |||
| 19 |
Employment Plusemploymentplus.com
A staffing and recruiting solutions provider with over 20 years of experience, offering industry-specific services to drive business results and client satisfaction |
619 | |||
| 20 |
Gibsonthegibsonedge.com
A consulting firm specializing in proactive insurance solutions for companies seeking growth, differentiation in the market, and risk preparation |
610 | |||
| 21 |
Peoplelink Staffing Solutionspeoplelinkstaffing.com
Strategic staffing solutions provider focused on driving productivity and profitability with a customer-centric, data-driven approach and a commitment to staff development and success |
597 | |||
| 22 |
Safety Management Groupsafetymanagementgroup.com
QHSE consultants focused on reducing risk, promoting sustainable operations, and enhancing safety culture to protect people, assets, and communities globally |
565 | |||
| 23 |
Knowledge Servicesknowledgeservices.com
A woman-owned business providing state-of-the-art technology and services for workforce management, vendor management, cybersecurity, and staffing solutions to government organizations nationwide |
535 | |||
| 24 |
Core BTSnri-na.com
A full-service digital transformation consulting firm that helps clients solve challenges and achieve business outcomes through integrated solutions |
503 | |||
| 25 |
iLABilabquality.com
iLAB specializes in providing global Software Quality Assurance services, including Quality Management, Testing, Project Management, and IT Consulting, with a focus on continuous learning and innovation |
493 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
enVistaenvistacorp.com
A leading consulting firm providing supply chain, technology, and IT services with expertise in automation, robotics, Microsoft solutions, and managed services |
482 | |||
| 27 |
NCWteamncw.com
Professional recruiting and staffing company with over 20 years of experience, focusing on employee development, client needs, and process streamlining in various industries |
478 | |||
| 28 |
Resultantresultant.com
Collaborative team combining engineering, data analysis, and consulting to solve complex challenges and empower clients in public and private sectors. |
454 | |||
| 29 |
Energy Systems Group (ESG)energysystemsgroup.com
A leading sustainable energy solutions provider specializing in energy efficiency, sustainability, resiliency, and infrastructure improvement for various sectors |
442 | |||
| 30 |
Lochmueller Grouplochgroup.com
Employee-owned firm providing survey, planning, engineering, environmental services, data collection, modeling, public involvement, design, and construction oversight nationwide. |
401 | |||
| 31 |
Diverse Staffingdiversestaffing.com
Provides contingent employment solutions and HR services across industries using hybrid recruiting to deliver top talent efficiently. |
397 | |||
| 32 |
Hall Renderhallrender.com
National health care law firm providing top legal counsel to health systems, hospitals, physicians, and other industry partners on regulatory, compliance, and operational issues |
394 | |||
| 33 |
Sales Xceleration庐salesxceleration.com
Sales Xceleration helps clients increase sales through a proven Sales Operating Management System, outsourced VP of Sales guidance, and tailored growth plans |
391 | |||
| 34 | 390 | ||||
| 35 |
INNOVATIVEinnovativei.com
A creative agency specializing in storytelling, problem-solving, and brand development through innovative solutions since 1993 Offering services in design, copywriting, and more |
388 | |||
| 36 |
DOZdozllc.com
DOZ offers accounting, consulting, and tax services to owners of multifamily housing, senior living facilities, commercial properties, and residential land developments, specializing in HUD and Low Income Housing Tax Credit projects |
369 | |||
| 37 |
First Call Staffingfirstcallinc.com
A women-owned staffing company that serves multiple industries, offering staffing, quality control, supplies, and professional services with a focus on ethics and customer satisfaction |
343 | |||
| 38 |
Morales Group, Incmoralesgroup.net
Nationally recognized Indianapolis-based MBE staffing company offering diverse solutions for various staffing needs, enhancing business agility, productivity, and competitiveness |
335 | |||
| 39 |
BSA LifeStructuresbsalifestructures.com
An interdisciplinary design firm specializing in creating innovative spaces for healing, learning, and discovery through architecture, engineering, interior design, and planning services |
324 | |||
| 40 |
Veristaverista.com
A leading consultancy firm providing systems, compliance, validation, and quality solutions to life science companies, improving health and lives through advanced technologies |
323 | |||
| 41 |
Syneos Healthsyneoshealth.com
A fully integrated biopharmaceutical solutions organization accelerating customer success by combining clinical, medical, and commercial capabilities worldwide |
320 | |||
| 42 |
Kemper CPA Group LLPkempercpa.com
A client-centric accounting firm offering diverse solutions, including technology consulting, capital management, and payroll services, focused on exceeding expectations |
320 | |||
| 43 |
Cloud Accountant Staffing - Careerscloudaccountantstaffing.com
Specialized in accounting firm outsourcing, offering skilled offshore team members in the Philippines from bookkeepers to experienced CPAs |
295 | |||
| 44 |
Moser Consultingmoserit.com
Technology solutions company specializing in big data, managed services, IT consulting, custom application development, and employee learning services. |
290 | |||
| 45 |
CBIZ SomersetSomersetCPAs.com
This company provides personalized financial guidance for clients of all sizes, combining expertise with a personal approach to meet individual needs |
263 | |||
| 46 |
LER TechForcelertechforce.com
An engineering firm with over 350 staff, focusing on employee success, backed by a global leader in functional safety consulting Owned and operated by women |
219 | |||
| 47 |
Butler, Fairman & Seufert, Inc.bfsengr.com
A leading civil engineering firm providing exceptional services to governments and businesses through communication, teamwork, and innovative approaches for successful projects |
212 | |||
| 48 |
Indiana Legal Services, Inc.indianalegalservices.org
A nonprofit law firm in Indiana provides free civil legal assistance to low-income individuals facing challenges with basic needs |
196 | |||
| 49 |
CSO Architectscsoinc.net
A design firm committed to excellence, integrity, and service in creating civic, corporate, educational, hotel, health, and research facilities in Indiana |
186 | |||
| 50 |
Schmidt Associatesschmidt-arch.com
Passionate team of architects, engineers, and interior designers creating inspiring spaces for schools, hospitals, community centers, and corporate offices #design #architecture #engineering |
182 | |||
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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 Nov 11, 2026.
More company lists in Indiana
- The largest companies in Indiana 1,520
- Manufacturers in Indiana 242
- Multinational companies in Indiana 177
- Education providers in Indiana 143
- Critical infrastructure operators in Indiana 129
- Healthcare providers in Indiana 123
- Hospitals and Health Care companies in Indiana 118
- Hardware manufacturers in Indiana 116
- Retail chains in Indiana 106
- Financial services firms in Indiana 105
- Companies with in-house R&D in Indiana 104
- Public sector organisations in Indiana 88
- Construction companies in Indiana 75
- Higher Education companies in Indiana 72
- Family-owned companies in Indiana 71
- Contract manufacturers in Indiana 70
- Automotive manufacturers and suppliers in Indiana 62
- Non-profit Organizations companies in Indiana 58
- Motor Vehicle Manufacturing companies in Indiana 54
- Corporate groups and holding companies in Indiana 54
- Financial Services companies in Indiana 53
- IT services companies in Indiana 51
- IT Services and IT Consulting companies in Indiana 50
- Consulting firms in Indiana 48
The same list elsewhere in United States
- Professional services firms in the United States 7,078
- Professional services firms in New York State 955
- Professional services firms in California 880
- Professional services firms in Texas 629
- Professional services firms in Florida 375
- Professional services firms in Virginia 344
- Professional services firms in Illinois 339
- Professional services firms in Massachusetts 249
- Professional services firms in New Jersey 249
- Professional services firms in Georgia 246
- Professional services firms in Pennsylvania 245
- Professional services firms in Ohio 195
- Professional services firms in Maryland 176
- Professional services firms in Michigan 172
- Professional services firms in Washington State 163
- Professional services firms in North Carolina 142
- Professional services firms in Alabama 135
- Professional services firms in Minnesota 125
- Professional services firms in New York 735
- Professional services firms in Chicago 196
- Professional services firms in Houston 156
- Professional services firms in Atlanta 143
- Professional services firms in San Francisco 130
- Professional services firms in Washington 109