# List of corporate groups and holding companies in Michigan

Tamtam tracks 90 corporate groups and holding companies headquartered in Michigan. This list ranks the 50 largest by number of employees on LinkedIn, led by Lear Corporation, Trinity Health and Gi Group. Their median headcount is 963. Half of them were founded in 1973 or later. The most common headquarters are Detroit (5), Grand Rapids (4) and Southfield (4).

This selection of large corporate groups and holding companies in Michigan reveals a strong presence in manufacturing, particularly automotive, alongside a significant healthcare sector. Notable examples include Lear Corporation, which designs and manufactures seating and electronic systems for automakers; Trinity Health, a not-for-profit health care system; and McLaren Health Care, an integrated health system. Other companies like Haworth specialize in furniture manufacturing, and Guardian Industries produces glass products.

The data shows a concentration of healthcare providers, with Trinity Health, McLaren Health Care, Bronson Healthcare, Munson Healthcare, and MyMichigan Health all headquartered in Michigan. This indicates a robust and localized healthcare industry, serving diverse communities across the state.

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

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Lear Corporation](https://www.tamtam.ai/c/lear-corporation) (lear.com)<br>Designs and manufactures advanced seating and electronic systems for major automakers, focusing on comfort, safety, and efficiency worldwide. | Motor Vehicle Manufacturing | 🇺🇸 Southfield | 52,409 |  |
| 2 | [Trinity Health](https://www.tamtam.ai/c/trinity-health-livonia) (trinity-health.org)<br>Not-for-profit, Catholic health care system with 123,000 colleagues and 27,000 physicians across 26 states, providing diverse communities with hospitals and other health services | Hospitals and Health Care | 🇺🇸 Livonia | 18,369 |  |
| 3 | [Gi Group](https://www.tamtam.ai/c/gi-group) (gigroup.com)<br>Providing temporary, permanent, professional staffing, executive search, outsourcing, training, outplacement, and HR consultancy services worldwide across multiple industries. | Staffing and Recruiting | 🇺🇸 Milan | 17,915 |  |
| 4 | [Real Estate One](https://www.tamtam.ai/c/real-estate-one) (realestateone.com)<br>A Michigan-based real estate company offering a variety of services and brands while prioritizing core values of excellence, integrity, and teamwork | Real Estate | 🇺🇸 Southfield | 10,741 | 1929 |
| 5 | [Learning Care Group](https://www.tamtam.ai/c/learning-care-group) (learningcare.com)<br>Providing safe, quality early learning and child care for children ages 6 weeks to 12 years across multiple nationwide locations. | Education Administration Programs | 🇺🇸 Novi | 10,328 |  |
| 6 | [McLaren Health Care](https://www.tamtam.ai/c/mclaren-health-care) (mclaren.org)<br>Integrated health system with hospitals, physician network, cancer centers, insurance, and medical education across Michigan, Indiana, and Ohio. | Hospitals and Health Care | 🇺🇸 Grand Blanc | 9,301 | 1914 |
| 7 | [Bronson Healthcare](https://www.tamtam.ai/c/bronson-healthcare) (bronsonhealth.com)<br>A leading healthcare system in southwest Michigan with over 9,000 employees, offering primary to critical care services across 100 locations | Hospitals and Health Care | 🇺🇸 Kalamazoo | 4,836 |  |
| 8 | [Munson Healthcare](https://www.tamtam.ai/c/munson-healthcare) (munsonhealthcare.org)<br>Leading healthcare system in northern Michigan with nine hospitals, advanced medical technology, partnerships with major health systems, and comprehensive care for 540,000 residents | Hospitals and Health Care | 🇺🇸 Traverse City | 4,644 | 1915 |
| 9 | [Haworth](https://www.tamtam.ai/c/haworth) (haworth.com)<br>A family-owned company founded in 1948, Haworth is a global leader in creating innovative workspaces through furniture, interior architecture, and technology solutions | Furniture and Home Furnishings Manufacturing | 🇺🇸 Holland | 4,358 | 1948 |
| 10 | [Guardian Industries](https://www.tamtam.ai/c/guardian-industries) (guardian.com)<br>Manufacture high-performance float, coated, and fabricated glass products for architectural, residential, transportation, and technical applications worldwide. | Glass, Ceramics and Concrete Manufacturing | 🇺🇸 Auburn Hills | 4,055 | 1932 |
| 11 | [MyMichigan Health](https://www.tamtam.ai/c/mymichigan-health) (mymichigan.org)<br>A non-profit health system affiliated with the University of Michigan, providing care, community benefits, and economic impact in Michigan | Hospitals and Health Care | 🇺🇸 Midland | 3,382 | 1984 |
| 12 | [UFP Industries](https://www.tamtam.ai/c/ufp-industries) (ufpi.com)<br>A global holding company with subsidiaries in packaging, construction, and retail solutions, manufacturing and distributing products for various industries worldwide | Holding Companies | 🇺🇸 Grand Rapids | 2,995 | 1955 |
| 13 | [Gentherm](https://www.tamtam.ai/c/gentherm) (gentherm.com)<br>Global leader in thermal management and pneumatic comfort technologies for automotive and medical industries Specializes in creating innovative heating, cooling, and ventilating devices | Manufacturing | 🇺🇸 Novi | 2,892 |  |
| 14 | [Project Worldwide](https://www.tamtam.ai/c/project-worldwide) (project.com)<br>Creative alliance combining multiple agencies focused on ambitious collaboration and meaningful work through hyperconnected creativity and diverse marketing expertise. | Advertising Services | 🇺🇸 Auburn Hills | 2,678 |  |
| 15 | [PIANOFORTE GROUP](https://www.tamtam.ai/c/pianoforte-group) (pianoforteholding.it)<br>A fashion retail group formed by the merger of Inticom and Kuvera, led by Italian families, operating with numerous stores worldwide | Retail | 🇺🇸 Milan | 2,602 | 2011 |
| 16 | [Universal Logistics Holdings, Inc.](https://www.tamtam.ai/c/universal-logistics-holdings-inc) (universallogistics.com)<br>Customized transportation and logistics solutions across North America, including transportation, intermodal, contract logistics, and global trade management services. | Transportation, Logistics, Supply Chain and Storage | 🇺🇸 Warren | 2,408 |  |
| 17 | [Barton Malow](https://www.tamtam.ai/c/barton-malow) (bartonmalow.com)<br>Innovative 100% employee-owned construction enterprise focused on building projects that impact communities and transform the industry | Construction | 🇺🇸 Southfield | 2,323 | 1924 |
| 18 | [Universal Forest Products, Inc.](https://www.tamtam.ai/c/universal-forest-products-inc) (ufpi.com)<br>A global corporation with 150 operations and 13,000 employees, specializing in wood and wood-alternative products for retail, industrial, and construction markets worldwide | Wholesale Building Materials | 🇺🇸 Grand Rapids | 2,087 | 1955 |
| 19 | [AUTOKINITON](https://www.tamtam.ai/c/autokiniton) (autokiniton.com)<br>Autokiniton invests in Tier 1 automotive suppliers, offering innovative solutions in metal stampings, welded assemblies, and tubular products for the automotive industry | Motor Vehicle Manufacturing | 🇺🇸 New Boston | 1,912 | 2018 |
| 20 | [Tower International](https://www.tamtam.ai/c/tower-international) (autokiniton.com)<br>Autokiniton invests in Tier 1 automotive suppliers, offering innovative solutions for metal stampings, welded assemblies, and structural components in the automotive industry | Motor Vehicle Manufacturing | 🇺🇸 New Boston | 1,766 |  |
| 21 | [Champion Home Builders, Inc.](https://www.tamtam.ai/c/champion-home-builders-inc) (championhomes.com)<br>Industry-leading off-site construction company producing residential and commercial buildings across North America and the UK, distributed through independent retailers and serving various sectors | Construction | 🇺🇸 Troy | 1,633 | 1953 |
| 22 | [Cabinetworks Group](https://www.tamtam.ai/c/cabinetworks-group) (cabinetworksgroup.com)<br>Leading privately held cabinetmaker in the USA, with 25 locations and 16 brands, dedicated to bringing life and humanity to kitchen cabinets | Wholesale Building Materials | 🇺🇸 Livonia | 1,537 | 2020 |
| 23 | [Morley](https://www.tamtam.ai/c/morley) (morleycompanies.com)<br>A company serving global Fortune 500 companies and institutions, offering customer service, event management, exhibit installations, and trade show services since 1863 | Advertising Services | 🇺🇸 Saginaw | 1,515 | 1863 |
| 24 | [Delta Dental of Michigan](https://www.tamtam.ai/c/delta-dental-of-michigan) (deltadentalmi.com)<br>Leading dental plan administrator providing superior dental benefits and supporting initiatives to improve oral and overall health in communities nationwide | Insurance | 🇺🇸 Okemos | 1,059 | 1957 |
| 25 | [AirLife](https://www.tamtam.ai/c/airlife) (myairlife.com)<br>A leader in medical device manufacturing, offering anesthesia and respiratory care products with a focus on patient safety and comfort Serving 97 countries worldwide | Medical Equipment Manufacturing | 🇺🇸 Grand Rapids | 963 | 1981 |
| 26 | [Doeren Mayhew](https://www.tamtam.ai/c/doeren-mayhew) (doeren.com)<br>Professionals providing guidance and direction to businesses and nonprofit organizations to traverse complex business terrain. Offers audit, tax, and business consulting services. | Accounting | 🇺🇸 Troy | 929 | 1932 |
| 27 | [AF - Group](https://www.tamtam.ai/c/af-group) (afgroup.com)<br>A leading holding company providing specialty insurance solutions through independent agents nationwide, underwritten by licensed insurer subsidiaries Visit afgroupcom for more information | Holding Companies | 🇺🇸 Lansing | 901 | 2016 |
| 28 | [Health Management Associates](https://www.tamtam.ai/c/health-management-associates) (healthmanagement.com)<br>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 | 🇺🇸 Okemos | 882 | 1985 |
| 29 | [Gestamp North America](https://www.tamtam.ai/c/gestamp-north-america) (gestamp.com)<br>Global automotive components manufacturer specializing in lightweight, safe products for vehicles Focus on innovation, energy efficiency, and environmental impact Operates internationally with extensive R&D and production capabilities | Motor Vehicle Manufacturing | 🇺🇸 Troy | 848 | 1997 |
| 30 | [BFF Banking Group](https://www.tamtam.ai/c/bff-banking-group) (bff.com)<br>Specialized in non-recourse factoring of public administration receivables, securities services, banking, and corporate payments across Europe. | Financial Services | 🇺🇸 Milan | 816 | 1985 |
| 31 | [Zeigler Automotive Group](https://www.tamtam.ai/c/zeigler-automotive-group) (zeigler.com)<br>A leading dealer group in the US with diverse automotive and motorsports offerings, executive training, finance, insurance, and leasing services | Motor Vehicle Manufacturing | 🇺🇸 Kalamazoo | 815 | 1975 |
| 32 | [Detroit Manufacturing Systems (DMS)](https://www.tamtam.ai/c/detroit-manufacturing-systems-dms) (dmsna.com)<br>Transforming lives by providing a welcoming environment for team members to learn new skills and deliver high-quality parts using innovative technology on time | Manufacturing | 🇺🇸 Detroit | 801 | 2012 |
| 33 | [Masco Cabinetry](https://www.tamtam.ai/c/masco-cabinetry) (cabinetworksgroup.com)<br>A leading manufacturer of cabinetry brands offering career development opportunities in a dynamic environment focused on growth and empowerment | Wholesale Building Materials | 🇺🇸 Ann Arbor | 797 |  |
| 34 | [Sun Communities & Sun RV Resorts](https://www.tamtam.ai/c/sun-communities-and-sun-rv-resorts) (linkedin.com)<br>Explore the new page for a company focused on outdoor leisure activities and communities, offering a range of outdoor experience options | Real Estate | 🇺🇸 Southfield | 723 | 1975 |
| 35 | [Webasto Americas](https://www.tamtam.ai/c/webasto-americas) (webasto.com)<br>Manufacturing automotive roof systems and electrification solutions, including sunroofs, serving global markets with extensive production and family-owned heritage. | Motor Vehicle Parts Manufacturing | 🇺🇸 Auburn Hills | 665 |  |
| 36 | [L&W Engineering](https://www.tamtam.ai/c/l-and-w-engineering) (autokiniton.com)<br>An automotive investment firm supporting Tier 1 suppliers, specializing in metal stampings, welded assemblies, and structural components for the industry | Motor Vehicle Manufacturing | 🇺🇸 New Boston | 645 | 1973 |
| 37 | [Acro Service Corp](https://www.tamtam.ai/c/acro-service-corp) (acrocorp.com)<br>Integrated staffing and consulting solutions provider with global reach, specializing in workforce management for various industries with a focus on quality and customer service | Staffing and Recruiting | 🇺🇸 Livonia | 625 | 1982 |
| 38 | [The Christman Company](https://www.tamtam.ai/c/the-christman-company) (christmanco.com)<br>A leading commercial construction management firm partnering with organizations across various industries to deliver expertise, leadership, and partnership in project execution | Construction | 🇺🇸 Lansing | 618 | 1894 |
| 39 | [First National Bank of America](https://www.tamtam.ai/c/first-national-bank-of-america) (fnba.com)<br>A nationally charted bank offering high CD rates, high-yield savings accounts, Non-QM mortgages, commercial loans, Self Directed IRA loans, and exceptional customer service | Banking | 🇺🇸 East Lansing | 581 | 1955 |
| 40 | [Coldwell Banker Schmidt Realtors](https://www.tamtam.ai/c/coldwell-banker-schmidt-realtors) (cbgreatlakes.com)<br>Established in 1927, we have grown to be one of the top real estate brokerages with 70 offices, 1,400 agents, and $3 Billion in sales volume | Real Estate | 🇺🇸 Traverse City | 576 | 1927 |
| 41 | [Avancez LLC](https://www.tamtam.ai/c/avancez-llc) (avancezassembly.com)<br>Specializing in creative modular assembly solutions and integrated global supply chain management for power train, chassis, and tire modules with just-in-time delivery | Motor Vehicle Manufacturing | 🇺🇸 Clarkston | 570 | 2012 |
| 42 | [Highstreet Insurance Partners](https://www.tamtam.ai/c/highstreet-insurance-partners) (hsip.com)<br>National insurance agency with 150+ partners, 2300 employees offering personal and business coverage solutions to help people pursue opportunities with confidence | Insurance | 🇺🇸 Traverse City | 548 | 2018 |
| 43 | [Link Engineering Company](https://www.tamtam.ai/c/link-engineering-company) (linkeng.com)<br>Customized solutions provider with a focus on high value, manufacturing precision equipment, offering test services, research, simulation, quality control, and cutting tools | Engineering Services | 🇺🇸 Plymouth | 547 | 1935 |
| 44 | [PVS Chemicals](https://www.tamtam.ai/c/pvs-chemicals) (pvschemicals.com)<br>A family-owned company providing safe and reliable delivery of diversified chemical products globally for a sustainable future | Chemical Manufacturing | 🇺🇸 Detroit | 540 | 1945 |
| 45 | [Rocket Companies](https://www.tamtam.ai/c/rocket-companies) (rocketcompanies.com)<br>Provides fast, trusted digital solutions for complex transactions across mortgages, fintech, real estate, automotive, and other industries. | Financial Services | 🇺🇸 Detroit | 505 | 1985 |
| 46 | [Novo Building Products](https://www.tamtam.ai/c/novo-building-products) (novobp.com)<br>Leading manufacturer and distributor of stair parts, mouldings, doors, and specialty millwork, along with board products, operating multiple brands Headquarters in Zeeland, Mich | Wholesale Building Materials | 🇺🇸 Zeeland Township | 500 | 2016 |
| 47 | [Edw. C. Levy Co.](https://www.tamtam.ai/c/edw-c-levy-co) (edwclevy.com)<br>A diverse group of companies providing innovative solutions and services to industries such as steel mills, construction, mining, agriculture, and real estate development globally | Construction | 🇺🇸 Dearborn | 475 | 1918 |
| 48 | [Cascade Engineering](https://www.tamtam.ai/c/cascade-engineering) (cascadeng.com)<br>Manufacturer and marketer with expertise in large part injection molding Offers products and consulting services across various industries, prioritizing sustainability and innovation | Plastics Manufacturing | 🇺🇸 Grand Rapids | 466 | 1973 |
| 49 | [ROCK](https://www.tamtam.ai/c/rock) (rock.com)<br>Family office managing investments and initiatives to foster growth, innovation, and prosperity in communities where employees live and work. | Holding Companies | 🇺🇸 Detroit | 460 | 2007 |
| 50 | [Duravent Group](https://www.tamtam.ai/c/duravent-group) (duraventgroup.com)<br>Global HVAC industry technology leader with venting system innovations, 15 locations across North America, best-in-class design, manufacturing, distribution, and customer service | Manufacturing | 🇺🇸 Detroit | 458 | 1956 |

## 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/holding-companies-michigan