# Top 50 professional services firms in Indiana

Tamtam tracks 69 professional services firms headquartered in Indiana. This list ranks the 50 largest by number of employees on LinkedIn, led by Elwood Staffing Services, Inc., TRIMEDX and Brooksource. Their median headcount is 493. Half of them were founded in 1994 or later. The most common headquarters are Indianapolis (31), Carmel (4) and Fishers (3).

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.

🇺🇸 Indiana · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Elwood Staffing Services, Inc.](https://www.tamtam.ai/c/elwood-staffing-services-inc) (elwoodstaffing.com)<br>A trusted company since 1980, offering job placement and workforce management solutions including temporary, direct hire, and recruitment process outsourcing services | Staffing and Recruiting | 🇺🇸 Columbus | 4,143 | 1980 |
| 2 | [TRIMEDX](https://www.tamtam.ai/c/trimedx) (trimedx.com)<br>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 | Hospitals and Health Care | 🇺🇸 Indianapolis | 2,721 | 1998 |
| 3 | [Brooksource](https://www.tamtam.ai/c/brooksource) (brooksource.com)<br>Trusted provider of Engineering & Technology solutions for Fortune 500 organizations, emphasizing Experience-Driven Staffing, Professional Services, and Workforce Transformation | IT Services and IT Consulting | 🇺🇸 Indianapolis | 2,497 | 2000 |
| 4 | [MS Companies](https://www.tamtam.ai/c/ms-companies) (mscompanies.com)<br>A data-driven technology company providing workforce solutions to OEMs and tiered suppliers, specializing in advisory, quality representation, inspection, and talent management services | Professional Services | 🇺🇸 Indianapolis | 2,236 | 1999 |
| 5 | [Barnes & Thornburg LLP](https://www.tamtam.ai/c/barnes-and-thornburg-llp) (btlaw.com)<br>Over 800 legal professionals in 23 offices provide expert legal services across disciplines, supporting businesses in a dynamic marketplace. | Law Practice | 🇺🇸 Indianapolis | 2,028 |  |
| 6 | [Eight Eleven Group](https://www.tamtam.ai/c/eight-eleven-group) (eightelevengroup.com)<br>Eight Eleven Group provides IT, engineering, healthcare, and business support services nationwide, focusing on creating great experiences for clients, consultants, and employees | Staffing and Recruiting | 🇺🇸 Indianapolis | 1,877 | 2000 |
| 7 | [LGC Staffing](https://www.tamtam.ai/c/lgc-staffing) (lgcassociates.com)<br>Dedicated team creating connections between clients and candidates, promoting diversity, inclusion, economic empowerment, and respect in staffing industry | Staffing and Recruiting | 🇺🇸 Indianapolis | 1,760 | 2003 |
| 8 | [Stratosphere Quality](https://www.tamtam.ai/c/stratosphere-quality) (stratospherequality.com)<br>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 | Outsourcing and Offshoring Consulting | 🇺🇸 Fishers | 1,740 | 2009 |
| 9 | [Qualus](https://www.tamtam.ai/c/qualus) (qualuscorp.com)<br>Innovative power services firm specializing in grid modernization, resiliency, sustainability, and software solutions for utilities, commercial, industrial, and government clients | Engineering Services | 🇺🇸 Usa | 1,668 |  |
| 10 | [BCforward](https://www.tamtam.ai/c/bcforward) (bcforward.com)<br>Global talent community empowering job seekers worldwide to advance careers and help organizations achieve goals in various industries Headquarters in Indianapolis and Hyderabad | IT Services and IT Consulting | 🇺🇸 Indianapolis | 1,662 | 1998 |
| 11 | [Peoplelink Group](https://www.tamtam.ai/c/peoplelink-group) (peoplelinkgroup.com)<br>A staffing group based in South Bend, IN, providing contract staff to companies nationwide Mission to link business and people, with customer-centric values | Staffing and Recruiting | 🇺🇸 South Bend | 1,205 | 1987 |
| 12 | [ACES](https://www.tamtam.ai/c/aces-carmel) (acespower.com)<br>A nationwide energy management company helping clients navigate and mitigate risks in the US energy markets without owning any energy commodities | Utilities | 🇺🇸 Carmel | 1,194 | 1999 |
| 13 | [CAI](https://www.tamtam.ai/c/cai-indianapolis) (caiready.com)<br>Trusted global experts providing engineers, project managers, and technicians to efficiently startup projects, lower costs, and drive speed to patient in various industries | Pharmaceutical Manufacturing | 🇺🇸 Indianapolis | 1,105 |  |
| 14 | [Medasource](https://www.tamtam.ai/c/medasource) (medasource.com)<br>Leading consulting and professional services provider in healthcare industry, offering services to Life Sciences, RCM/Payers, Technology, and Government sectors | Hospitals and Health Care | 🇺🇸 Indianapolis | 997 | 2000 |
| 15 | [KSM (Katz, Sapper & Miller)](https://www.tamtam.ai/c/ksm-katz-sapper-and-miller) (ksmcpa.com)<br>A nationally recognized firm offering advisory, tax, and audit services, leveraging technology and diverse perspectives to help clients thrive and innovate | Accounting | 🇺🇸 Indianapolis | 915 | 1942 |
| 16 | [Ice Miller LLP](https://www.tamtam.ai/c/ice-miller-llp) (icemiller.com)<br>Provides comprehensive legal services with a focus on understanding client needs to build, grow, and protect valuable assets. | Law Practice | 🇺🇸 Indianapolis | 891 | 1910 |
| 17 | [American Structurepoint](https://www.tamtam.ai/c/american-structurepoint) (structurepoint.com)<br>Providing innovative engineering, design, and consulting services across various disciplines to support projects from concept through completion. | Civil Engineering | 🇺🇸 Indianapolis | 767 | 1966 |
| 18 | [Blue & Co., LLC](https://www.tamtam.ai/c/blue-and-co-llc) (blueandco.com)<br>Blue & Co provides a wide range of professional services including auditing, business planning, financial controls, and litigation support to help clients succeed | Accounting | 🇺🇸 Carmel | 626 | 1970 |
| 19 | [Employment Plus](https://www.tamtam.ai/c/employment-plus) (employmentplus.com)<br>A staffing and recruiting solutions provider with over 20 years of experience, offering industry-specific services to drive business results and client satisfaction | Staffing and Recruiting | 🇺🇸 Bloomington | 619 | 1993 |
| 20 | [Gibson](https://www.tamtam.ai/c/gibson) (thegibsonedge.com)<br>A consulting firm specializing in proactive insurance solutions for companies seeking growth, differentiation in the market, and risk preparation | Insurance | 🇺🇸 South Bend | 610 | 1933 |
| 21 | [Peoplelink Staffing Solutions](https://www.tamtam.ai/c/peoplelink-staffing-solutions) (peoplelinkstaffing.com)<br>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 | Staffing and Recruiting | 🇺🇸 South Bend | 597 | 1987 |
| 22 | [Safety Management Group](https://www.tamtam.ai/c/safety-management-group) (safetymanagementgroup.com)<br>QHSE consultants focused on reducing risk, promoting sustainable operations, and enhancing safety culture to protect people, assets, and communities globally | Construction | 🇺🇸 Indianapolis | 565 | 1991 |
| 23 | [Knowledge Services](https://www.tamtam.ai/c/knowledge-services) (knowledgeservices.com)<br>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 | IT Services and IT Consulting | 🇺🇸 Indianapolis | 535 | 1994 |
| 24 | [Core BTS](https://www.tamtam.ai/c/core-bts) (nri-na.com)<br>A full-service digital transformation consulting firm that helps clients solve challenges and achieve business outcomes through integrated solutions | IT Services and IT Consulting | 🇺🇸 Indianapolis | 503 | 2004 |
| 25 | [iLAB](https://www.tamtam.ai/c/ilab-indianapolis) (ilabquality.com)<br>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 | IT Services and IT Consulting | 🇺🇸 Indianapolis | 493 | 1995 |
| 26 | [enVista](https://www.tamtam.ai/c/envista) (envistacorp.com)<br>A leading consulting firm providing supply chain, technology, and IT services with expertise in automation, robotics, Microsoft solutions, and managed services | Business Consulting and Services | 🇺🇸 Carmel | 482 | 2002 |
| 27 | [NCW](https://www.tamtam.ai/c/ncw) (teamncw.com)<br>Professional recruiting and staffing company with over 20 years of experience, focusing on employee development, client needs, and process streamlining in various industries | Staffing and Recruiting | 🇺🇸 Indianapolis | 478 | 2000 |
| 28 | [Resultant](https://www.tamtam.ai/c/resultant) (resultant.com)<br>Collaborative team combining engineering, data analysis, and consulting to solve complex challenges and empower clients in public and private sectors. | Business Consulting and Services | 🇺🇸 Indianapolis | 454 | 2008 |
| 29 | [Energy Systems Group (ESG)](https://www.tamtam.ai/c/energy-systems-group-esg) (energysystemsgroup.com)<br>A leading sustainable energy solutions provider specializing in energy efficiency, sustainability, resiliency, and infrastructure improvement for various sectors | Engineering Services | 🇺🇸 Newburgh | 442 | 1994 |
| 30 | [Lochmueller Group](https://www.tamtam.ai/c/lochmueller-group) (lochgroup.com)<br>Employee-owned firm providing survey, planning, engineering, environmental services, data collection, modeling, public involvement, design, and construction oversight nationwide. | Civil Engineering | 🇺🇸 Evansville | 401 | 1980 |
| 31 | [Diverse Staffing](https://www.tamtam.ai/c/diverse-staffing) (diversestaffing.com)<br>Provides contingent employment solutions and HR services across industries using hybrid recruiting to deliver top talent efficiently. | Staffing and Recruiting | 🇺🇸 Indianapolis | 397 | 1999 |
| 32 | [Hall Render](https://www.tamtam.ai/c/hall-render) (hallrender.com)<br>National health care law firm providing top legal counsel to health systems, hospitals, physicians, and other industry partners on regulatory, compliance, and operational issues | Law Practice | 🇺🇸 Indianapolis | 394 | 1967 |
| 33 | [Sales Xceleration®](https://www.tamtam.ai/c/sales-xceleration) (salesxceleration.com)<br>Sales Xceleration helps clients increase sales through a proven Sales Operating Management System, outsourced VP of Sales guidance, and tailored growth plans | Business Consulting and Services | 🇺🇸 Fishers | 391 | 2011 |
| 34 | [TRISTAR](https://www.tamtam.ai/c/tristar) (star3.com)<br>A veteran-owned professional services company specializing in electronic warfare, cybersecurity, IT, and technical solutions for Department of Defense programs | Defense and Space Manufacturing | 🇺🇸 Bloomington | 390 | 1995 |
| 35 | [INNOVATIVE](https://www.tamtam.ai/c/innovative) (innovativei.com)<br>A creative agency specializing in storytelling, problem-solving, and brand development through innovative solutions since 1993 Offering services in design, copywriting, and more | Advertising Services | 🇺🇸 Indianapolis | 388 | 1993 |
| 36 | [DOZ](https://www.tamtam.ai/c/doz-carmel) (dozllc.com)<br>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 | Accounting | 🇺🇸 Carmel | 369 | 1987 |
| 37 | [First Call Staffing](https://www.tamtam.ai/c/first-call-staffing) (firstcallinc.com)<br>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 | Staffing and Recruiting | 🇺🇸 Indianapolis | 343 | 1991 |
| 38 | [Morales Group, Inc](https://www.tamtam.ai/c/morales-group-inc) (moralesgroup.net)<br>Nationally recognized Indianapolis-based MBE staffing company offering diverse solutions for various staffing needs, enhancing business agility, productivity, and competitiveness | Staffing and Recruiting | 🇺🇸 Indianapolis | 335 | 2003 |
| 39 | [BSA LifeStructures](https://www.tamtam.ai/c/bsa-lifestructures) (bsalifestructures.com)<br>An interdisciplinary design firm specializing in creating innovative spaces for healing, learning, and discovery through architecture, engineering, interior design, and planning services | Architecture and Planning | 🇺🇸 Indianapolis | 324 | 1975 |
| 40 | [Verista](https://www.tamtam.ai/c/verista) (verista.com)<br>A leading consultancy firm providing systems, compliance, validation, and quality solutions to life science companies, improving health and lives through advanced technologies | Pharmaceutical Manufacturing | 🇺🇸 Fishers | 323 | 2020 |
| 41 | [Syneos Health](https://www.tamtam.ai/c/syneos-health-hammond) (syneoshealth.com)<br>A fully integrated biopharmaceutical solutions organization accelerating customer success by combining clinical, medical, and commercial capabilities worldwide | Business Consulting and Services | 🇺🇸 Hammond | 320 |  |
| 42 | [Kemper CPA Group LLP](https://www.tamtam.ai/c/kemper-cpa-group-llp) (kempercpa.com)<br>A client-centric accounting firm offering diverse solutions, including technology consulting, capital management, and payroll services, focused on exceeding expectations | Accounting | 🇺🇸 Evansville | 320 | 1958 |
| 43 | [Cloud Accountant Staffing - Careers](https://www.tamtam.ai/c/cloud-accountant-staffing-careers) (cloudaccountantstaffing.com)<br>Specialized in accounting firm outsourcing, offering skilled offshore team members in the Philippines from bookkeepers to experienced CPAs | Staffing and Recruiting | 🇺🇸 Indianapolis | 295 | 2021 |
| 44 | [Moser Consulting](https://www.tamtam.ai/c/moser-consulting) (moserit.com)<br>Technology solutions company specializing in big data, managed services, IT consulting, custom application development, and employee learning services. | IT Services and IT Consulting | 🇺🇸 Indianapolis | 290 | 1996 |
| 45 | [CBIZ Somerset](https://www.tamtam.ai/c/cbiz-somerset) (SomersetCPAs.com)<br>This company provides personalized financial guidance for clients of all sizes, combining expertise with a personal approach to meet individual needs | Accounting | 🇺🇸 Indianapolis | 263 | 1960 |
| 46 | [LER TechForce](https://www.tamtam.ai/c/ler-techforce) (lertechforce.com)<br>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 | Engineering Services | 🇺🇸 Columbus | 219 |  |
| 47 | [Butler, Fairman & Seufert, Inc.](https://www.tamtam.ai/c/butler-fairman-and-seufert-inc) (bfsengr.com)<br>A leading civil engineering firm providing exceptional services to governments and businesses through communication, teamwork, and innovative approaches for successful projects | Civil Engineering | 🇺🇸 Indianapolis | 212 | 1961 |
| 48 | [Indiana Legal Services, Inc.](https://www.tamtam.ai/c/indiana-legal-services-inc) (indianalegalservices.org)<br>A nonprofit law firm in Indiana provides free civil legal assistance to low-income individuals facing challenges with basic needs | Law Practice | 🇺🇸 Indianapolis | 196 |  |
| 49 | [CSO Architects](https://www.tamtam.ai/c/cso-architects) (csoinc.net)<br>A design firm committed to excellence, integrity, and service in creating civic, corporate, educational, hotel, health, and research facilities in Indiana | Architecture and Planning | 🇺🇸 Indianapolis | 186 | 1961 |
| 50 | [Schmidt Associates](https://www.tamtam.ai/c/schmidt-associates) (schmidt-arch.com)<br>Passionate team of architects, engineers, and interior designers creating inspiring spaces for schools, hospitals, community centers, and corporate offices #design #architecture #engineering | Architecture and Planning | 🇺🇸 Indianapolis | 182 | 1976 |

## 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 12, 2026.

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