The companies in Wisconsin with in-house R&D are mostly large groups, with a strong presence in manufacturing and healthcare. Fiserv is a global technology provider in financial services, while Epic develops healthcare software. Rockwell Automation focuses on connecting human imagination with technology, and SC Johnson manufactures household cleaning products.
A significant pattern in the data is the concentration of headquarters in Milwaukee, indicating a central hub for these large companies within the state. Other prominent cities include Madison and Verona.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Fiservfiserv.com
A global technology provider in financial services industry, specializing in payments, processing, risk & compliance, customer management, and business optimization |
44,000 | |||
| 2 |
University of Wisconsin-Madisonwisc.edu
A prestigious public university in Madison, offering a wide range of liberal arts studies, professional programs, and student activities on a sprawling campus |
30,836 | |||
| 3 |
Rockwell Automationrockwellautomation.com
It connects human imagination with technology potential, enhancing intelligence, connectivity, and productivity through recognized brands like Allen-Bradley and Rockwell Software. |
22,584 | |||
| 4 | 17,501 | ||||
| 5 |
Advocate Aurora Healthadvocateaurorahealth.org
An integrated health system providing high-quality care, clinical innovation, and research studies, with a strong focus on academic partnerships and community benefits |
15,279 | |||
| 6 |
A. O. Smith Corporationaosmith.com
Manufacturing and distributing residential and commercial water heaters and boilers with innovative, energy-efficient technology across global markets. |
14,023 | |||
| 7 |
Aurora Health Carecareers.aah.org
Nonprofit integrated health system providing clinical innovation, specialized care, research, education, and community benefits across multiple states. |
13,816 | |||
| 8 |
SC Johnsonscjohnson.com
A leading manufacturer of household cleaning, storage, pest control, air care products worldwide, promoting sustainability and transparency with iconic brands |
13,764 | |||
| 9 |
Ashley Furniture Industriesashleyfurnitureindustriesllc.com
Design, manufacture, and deliver a broad range of furniture products to retail partners worldwide, focusing on quality and customer satisfaction. |
11,618 | |||
| 10 |
Harley-Davidson Motor Companyharley-davidson.com
Manufacturing iconic motorcycles embodying adventure and freedom, fostering a unique lifestyle brand with a focus on innovation and culture. |
11,289 | |||
| 11 |
UW Healthuwhealth.org
Integrated academic health system operating multiple hospitals and clinics, providing care to over 832,000 patients annually in Wisconsin and Illinois. |
10,155 | |||
| 12 |
Plexus Corp.plexus.com
A global leader in providing design, development, supply chain solutions, manufacturing, and aftermarket services for companies in complex industries since 1979 |
9,957 | |||
| 13 |
Milwaukee Toolbit.ly
Innovative technology-focused company in power, hand tools industry Offers fast-paced design environment, professional development, and empowers leaders to succeed |
9,854 | |||
| 14 |
Oshkosh Corporationoshkoshcorp.com
Design and manufacture advanced industrial equipment using electrification, autonomy, AI, and connectivity for tough jobs worldwide. |
7,170 | |||
| 15 |
Snap-onsnapon.com
Global leader in designing, manufacturing, and marketing tools, equipment, diagnostics, and repair solutions for professionals across various industries worldwide |
7,077 | |||
| 16 |
Clariosclarios.com
Global leader in advanced energy storage solutions, producing 150 million batteries annually for a third of the world's vehicles Expanding capacity to meet future demand |
6,268 | |||
| 17 |
Regal Rexnordmaintenance.regalrexnord.com
Global manufacturer of sustainable solutions for airflow, motion control, power transmission, and power generation in commercial, industrial, and residential settings Headquarters in Milwaukee, Wisconsin |
5,921 | |||
| 18 |
Marquette Universitymarquette.edu
Catholic Jesuit university serving students, advancing knowledge with diverse undergraduate, graduate, professional programs, dentistry and law schools. |
5,579 | |||
| 19 |
Komatsu Miningkomatsu.com
Development and supply of technologies, equipment, and services for construction, mining, industrial, forestry, and forklift markets worldwide. |
5,339 | |||
| 20 |
Exact Sciencesexactsciences.com
Development of cancer prevention and early detection solutions, guiding personalized treatment to help eradicate cancer and improve patient outcomes. |
5,321 | |||
| 21 |
Marshfield Clinic Health Systemmarshfieldclinic.org
Providing comprehensive healthcare services, research, education, and community partnerships across rural Wisconsin and Michigan's Upper Peninsula. |
5,019 | |||
| 22 |
Froedtert Healthfroedtert.com
Academic medical center with multiple hospitals and clinics providing patient care, medical research, education, and trauma services across Wisconsin. |
4,892 | |||
| 23 |
Brady Corporationbradyid.com
An international manufacturer providing complete solutions for identifying and protecting people, products, and places through labels, signs, safety devices, and software |
4,291 | |||
| 24 |
Generacgenerac.com
Providing reliable, efficient energy solutions for homes, businesses, and critical infrastructure to ensure comfort, safety, and energy independence. |
4,197 | |||
| 25 |
Briggs & Strattonbriggsandstratton.com
Design, manufacture, and market engines, lithium-ion batteries, generators, energy storage, and outdoor power equipment globally under multiple brand names. |
3,691 | |||
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 |
Modine Manufacturing Companymodine.com
This company specializes in innovative thermal technology, providing customized heating and cooling solutions for vehicle and commercial equipment manufacturers since 1916 |
3,466 | |||
| 27 |
Trek Bicycletrekbikes.com
This company values individuality, welcomes all backgrounds, and is passionate about creating a diverse and inclusive environment |
3,384 | |||
| 28 |
Marshfield Clinicmarshfieldclinic.org
A large private multispecialty group practice with 775 physicians in 80 specialties across Wisconsin and Michigan's Upper Peninsula |
3,282 | |||
| 29 |
Sensient Technologies Corporationsensient.com
Enhancing sensory experiences by developing specialized ingredients and technologies for colors, flavors, and extracts in industries worldwide |
3,134 | |||
| 30 |
Mercury Marinemercurymarine.com
designs, manufactures, distributes marine engines, parts, and accessories for recreational, commercial, and government boating applications worldwide |
2,887 | |||
| 31 |
Rehlkorehlko.com
providing global energy resilience solutions with innovative power systems and engines, supporting industrial and residential energy needs worldwide |
2,710 | |||
| 32 |
The Manitowoc Companymanitowoc.com
Design and manufacture of crawler, boom, telescoping, and tower cranes with innovative products and strong customer support services worldwide. |
2,505 | |||
| 33 | 2,314 | ||||
| 34 |
Enerpac Tool Groupenerpactoolgroup.com
A global industrial tools and services company specializing in high-pressure hydraulic tools, controlled force products, and heavy load positioning solutions |
2,226 | |||
| 35 |
Versiti Inc.versiti.org
Blood health innovators focused on discovery, diagnosis, and treatment, conducting groundbreaking research and providing life-saving donations to communities and healthcare partners nation-wide |
2,047 | |||
| 36 |
Rogers Behavioral Healthrogersbh.org
Nationally recognized provider of specialized psychiatric care for a variety of mental health disorders in communities across the country |
2,025 | |||
| 37 |
Promega Corporationpromega.com
Promega Corporation collaborates globally to develop innovative technologies in the life sciences, fostering creativity, sustainability, and meaningful connections with customers |
1,991 | |||
| 38 |
SMC Ltdsmcltd.com
Offers global contract manufacturing and molding services for medical devices, diagnostics, and pharmaceutical industries, including design, engineering, and assembly. |
1,783 | |||
| 39 |
Sub-Zero Group, Inc.subzero-wolf.com
Family-owned manufacturer producing professional-grade refrigeration, cooking, and dishwashing appliances designed for long-lasting performance, precision craftsmanship, and food preservation in high-end residential kitchens. |
1,775 | |||
| 40 |
Oshkosh Defenseoshkoshdefense.com
Design, production, and sustainment of heavy, medium, and light military vehicles plus mobility systems with global logistics and life cycle fleet support. |
1,610 | |||
| 41 |
UW School of Medicine and Public Healthmed.wisc.edu
Advancing health equity through patient care, education, and research to promote healthy individuals and communities in Madison, WI |
1,472 | |||
| 42 |
Pierce Manufacturingpiercemfg.com
Leading North American manufacturer of custom fire apparatus including pumpers, aerials, rescue trucks, wildland trucks, and tankers Part of Oshkosh Corporation Website: wwwpiercemfgcom |
1,422 | |||
| 43 |
University of Wisconsin Hospital and Clinicsuwhealth.org
A prestigious academic medical center with 471 beds, specializing in cancer treatment, pediatrics, ophthalmology, surgical specialties, and organ transplantation |
1,378 | |||
| 44 |
BW Convertingbwconverting.com
Design and manufacture precision machinery for tissue, hygiene, print, packaging, mailing, textiles, and other high-performance industrial applications worldwide. |
1,373 | |||
| 45 |
Badger Meterbadgermeter.com
Global provider of smart water solutions, encompassing flow measurement, water quality, and pressure monitoring. Offers data and analytics to optimize operations and ensure sustainable water use. |
1,378 | |||
| 46 |
Electronic Theatre Controlsetcconnect.com
Manufacturer of lighting and rigging technology, developing professional tools for various venues worldwide, with a strong focus on technical and customer service. |
1,367 | |||
| 47 |
Rexnordrexnord.com
A global corporation specializing in mechanical components and smart solutions for industries like automotive, food & beverage, energy, and mining Headquarters in Milwaukee, Wisconsin |
1,342 | |||
| 48 |
Greenheckgreenheck.com
Global leader in engineering and manufacturing ventilation equipment to improve indoor air quality, safety, and comfort in nonresidential buildings |
1,311 | |||
| 49 |
Miller Electric Mfg. LLCmillerwelds.com
A company that manufactures innovative welding products for various industries, providing exceptional customer service and fostering opportunities for career growth |
1,301 | |||
| 50 |
Nelson Globalnelsongp.com
Engineering and manufacturing air, fluid transfer, NVH, structural, acoustic, and thermal management solutions for leading global OEMs. |
1,286 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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.
More company lists in Wisconsin
- The largest companies in Wisconsin 1,669
- Manufacturers in Wisconsin 331
- Multinational companies in Wisconsin 210
- Hardware manufacturers in Wisconsin 169
- Retail chains in Wisconsin 140
- Contract manufacturers in Wisconsin 126
- Education providers in Wisconsin 124
- Financial services firms in Wisconsin 119
- Family-owned companies in Wisconsin 116
- Critical infrastructure operators in Wisconsin 115
- Healthcare providers in Wisconsin 104
- Machinery Manufacturing companies in Wisconsin 97
- Hospitals and Health Care companies in Wisconsin 95
- Professional services firms in Wisconsin 82
- Construction companies in Wisconsin 81
- Public sector organisations in Wisconsin 75
- Financial Services companies in Wisconsin 71
- Companies with a mobile app in Wisconsin 67
- Manufacturing companies in Wisconsin 63
- Corporate groups and holding companies in Wisconsin 60
- Higher Education companies in Wisconsin 57
- Industrial Machinery Manufacturing companies in Wisconsin 56
- Distributors and wholesalers in Wisconsin 56
- Insurance companies in Wisconsin 55
The same list elsewhere in United States
- Companies with in-house R&D in the United States 6,796
- Companies with in-house R&D in California 1,276
- Companies with in-house R&D in Texas 442
- Companies with in-house R&D in New York State 419
- Companies with in-house R&D in Massachusetts 396
- Companies with in-house R&D in Illinois 322
- Companies with in-house R&D in Michigan 287
- Companies with in-house R&D in Ohio 277
- Companies with in-house R&D in Pennsylvania 255
- Companies with in-house R&D in New Jersey 224
- Companies with in-house R&D in Florida 221
- Companies with in-house R&D in Alabama 214
- Companies with in-house R&D in Georgia 173
- Companies with in-house R&D in Virginia 166
- Companies with in-house R&D in North Carolina 158
- Companies with in-house R&D in Minnesota 146
- Companies with in-house R&D in Washington State 140
- Companies with in-house R&D in Colorado 113
- Companies with in-house R&D in Maryland 107
- Companies with in-house R&D in Indiana 104
- Companies with in-house R&D in New York 223
- Companies with in-house R&D in San Francisco 147
- Companies with in-house R&D in Houston 129
- Companies with in-house R&D in San Jose 103