# List of companies with in-house R&D in Wisconsin

Tamtam tracks 154 companies with in-house R&D headquartered in Wisconsin. This list ranks the 50 largest by number of employees on LinkedIn, led by Fiserv, University of Wisconsin-Madison and Rockwell Automation. Their median headcount is 3,691. Half of them were founded in 1929 or later. The most common headquarters are Milwaukee (18), Madison (7) and Appleton (2).

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.

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

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Fiserv](https://www.tamtam.ai/c/fiserv) (fiserv.com)<br>A global technology provider in financial services industry, specializing in payments, processing, risk & compliance, customer management, and business optimization | IT Services and IT Consulting | 🇺🇸 Milwaukee | 44,000 | 1984 |
| 2 | [University of Wisconsin-Madison](https://www.tamtam.ai/c/university-of-wisconsin-madison) (wisc.edu)<br>A prestigious public university in Madison, offering a wide range of liberal arts studies, professional programs, and student activities on a sprawling campus | Higher Education | 🇺🇸 Madison | 30,836 |  |
| 3 | [Rockwell Automation](https://www.tamtam.ai/c/rockwell-automation) (rockwellautomation.com)<br>It connects human imagination with technology potential, enhancing intelligence, connectivity, and productivity through recognized brands like Allen-Bradley and Rockwell Software. | Automation Machinery Manufacturing | 🇺🇸 Milwaukee | 22,584 |  |
| 4 | [Epic](https://www.tamtam.ai/c/epic) (epic.com)<br>Development and implementation of healthcare software used globally by patients and doctors, with training for professionals from diverse backgrounds. | Software Development | 🇺🇸 Verona | 17,501 | 1979 |
| 5 | [Advocate Aurora Health](https://www.tamtam.ai/c/advocate-aurora-health) (advocateaurorahealth.org)<br>An integrated health system providing high-quality care, clinical innovation, and research studies, with a strong focus on academic partnerships and community benefits | Hospitals and Health Care | 🇺🇸 Milwaukee | 15,279 | 2018 |
| 6 | [A. O. Smith Corporation](https://www.tamtam.ai/c/a-o-smith-corporation) (aosmith.com)<br>Manufacturing and distributing residential and commercial water heaters and boilers with innovative, energy-efficient technology across global markets. | Manufacturing | 🇺🇸 Milwaukee | 14,023 | 1874 |
| 7 | [Aurora Health Care](https://www.tamtam.ai/c/aurora-health-care) (careers.aah.org)<br>Nonprofit integrated health system providing clinical innovation, specialized care, research, education, and community benefits across multiple states. | Hospitals and Health Care | 🇺🇸 Milwaukee | 13,816 |  |
| 8 | [SC Johnson](https://www.tamtam.ai/c/sc-johnson) (scjohnson.com)<br>A leading manufacturer of household cleaning, storage, pest control, air care products worldwide, promoting sustainability and transparency with iconic brands | Manufacturing | 🇺🇸 Racine | 13,764 | 1886 |
| 9 | [Ashley Furniture Industries](https://www.tamtam.ai/c/ashley-furniture-industries) (ashleyfurnitureindustriesllc.com)<br>Design, manufacture, and deliver a broad range of furniture products to retail partners worldwide, focusing on quality and customer satisfaction. | Furniture and Home Furnishings Manufacturing | 🇺🇸 Arcadia | 11,618 |  |
| 10 | [Harley-Davidson Motor Company](https://www.tamtam.ai/c/harley-davidson-motor-company) (harley-davidson.com)<br>Manufacturing iconic motorcycles embodying adventure and freedom, fostering a unique lifestyle brand with a focus on innovation and culture. | Motor Vehicle Manufacturing | 🇺🇸 Milwaukee | 11,289 | 1903 |
| 11 | [UW Health](https://www.tamtam.ai/c/uw-health) (uwhealth.org)<br>Integrated academic health system operating multiple hospitals and clinics, providing care to over 832,000 patients annually in Wisconsin and Illinois. | Hospitals and Health Care | 🇺🇸 Madison | 10,155 |  |
| 12 | [Plexus Corp.](https://www.tamtam.ai/c/plexus-corp) (plexus.com)<br>A global leader in providing design, development, supply chain solutions, manufacturing, and aftermarket services for companies in complex industries since 1979 | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Neenah | 9,957 | 1979 |
| 13 | [Milwaukee Tool](https://www.tamtam.ai/c/milwaukee-tool) (bit.ly)<br>Innovative technology-focused company in power, hand tools industry Offers fast-paced design environment, professional development, and empowers leaders to succeed | Manufacturing | 🇺🇸 Brookfield | 9,854 | 1924 |
| 14 | [Oshkosh Corporation](https://www.tamtam.ai/c/oshkosh-corporation) (oshkoshcorp.com)<br>Design and manufacture advanced industrial equipment using electrification, autonomy, AI, and connectivity for tough jobs worldwide. | Motor Vehicle Manufacturing | 🇺🇸 Oshkosh | 7,170 | 1917 |
| 15 | [Snap-on](https://www.tamtam.ai/c/snap-on) (snapon.com)<br>Global leader in designing, manufacturing, and marketing tools, equipment, diagnostics, and repair solutions for professionals across various industries worldwide | Machinery Manufacturing | 🇺🇸 Kenosha | 7,077 | 1920 |
| 16 | [Clarios](https://www.tamtam.ai/c/clarios) (clarios.com)<br>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 | Motor Vehicle Parts Manufacturing | 🇺🇸 Glendale | 6,268 |  |
| 17 | [Regal Rexnord](https://www.tamtam.ai/c/regal-rexnord) (maintenance.regalrexnord.com)<br>Global manufacturer of sustainable solutions for airflow, motion control, power transmission, and power generation in commercial, industrial, and residential settings Headquarters in Milwaukee, Wisconsin | Electric Power Transmission, Control, and Distribution | 🇺🇸 Milwaukee | 5,921 | 1955 |
| 18 | [Marquette University](https://www.tamtam.ai/c/marquette-university) (marquette.edu)<br>Catholic Jesuit university serving students, advancing knowledge with diverse undergraduate, graduate, professional programs, dentistry and law schools. | Higher Education | 🇺🇸 Milwaukee | 5,579 | 1881 |
| 19 | [Komatsu Mining](https://www.tamtam.ai/c/komatsu-mining) (komatsu.com)<br>Development and supply of technologies, equipment, and services for construction, mining, industrial, forestry, and forklift markets worldwide. | Mining | 🇺🇸 Milwaukee | 5,339 | 2017 |
| 20 | [Exact Sciences](https://www.tamtam.ai/c/exact-sciences) (exactsciences.com)<br>Development of cancer prevention and early detection solutions, guiding personalized treatment to help eradicate cancer and improve patient outcomes. | Biotechnology Research | 🇺🇸 Madison | 5,321 |  |
| 21 | [Marshfield Clinic Health System](https://www.tamtam.ai/c/marshfield-clinic-health-system) (marshfieldclinic.org)<br>Providing comprehensive healthcare services, research, education, and community partnerships across rural Wisconsin and Michigan's Upper Peninsula. | Hospitals and Health Care | 🇺🇸 Marshfield | 5,019 | 1916 |
| 22 | [Froedtert Health](https://www.tamtam.ai/c/froedtert-health) (froedtert.com)<br>Academic medical center with multiple hospitals and clinics providing patient care, medical research, education, and trauma services across Wisconsin. | Hospitals and Health Care | 🇺🇸 Milwaukee | 4,892 |  |
| 23 | [Brady Corporation](https://www.tamtam.ai/c/brady-corporation) (bradyid.com)<br>An international manufacturer providing complete solutions for identifying and protecting people, products, and places through labels, signs, safety devices, and software | Manufacturing | 🇺🇸 Milwaukee | 4,291 | 1914 |
| 24 | [Generac](https://www.tamtam.ai/c/generac) (generac.com)<br>Providing reliable, efficient energy solutions for homes, businesses, and critical infrastructure to ensure comfort, safety, and energy independence. | Electric Power Generation | 🇺🇸 Waukesha | 4,197 | 1959 |
| 25 | [Briggs & Stratton](https://www.tamtam.ai/c/briggs-and-stratton) (briggsandstratton.com)<br>Design, manufacture, and market engines, lithium-ion batteries, generators, energy storage, and outdoor power equipment globally under multiple brand names. | Manufacturing | 🇺🇸 Milwaukee | 3,691 | 1908 |
| 26 | [Modine Manufacturing Company](https://www.tamtam.ai/c/modine-manufacturing-company) (modine.com)<br>This company specializes in innovative thermal technology, providing customized heating and cooling solutions for vehicle and commercial equipment manufacturers since 1916 | Manufacturing | 🇺🇸 Racine | 3,466 | 1916 |
| 27 | [Trek Bicycle](https://www.tamtam.ai/c/trek-bicycle) (trekbikes.com)<br>This company values individuality, welcomes all backgrounds, and is passionate about creating a diverse and inclusive environment | Sporting Goods Manufacturing | 🇺🇸 Waterloo | 3,384 | 1976 |
| 28 | [Marshfield Clinic](https://www.tamtam.ai/c/marshfield-clinic) (marshfieldclinic.org)<br>A large private multispecialty group practice with 775 physicians in 80 specialties across Wisconsin and Michigan's Upper Peninsula | Hospitals and Health Care | 🇺🇸 Marshfield | 3,282 | 1916 |
| 29 | [Sensient Technologies Corporation](https://www.tamtam.ai/c/sensient-technologies-corporation) (sensient.com)<br>Enhancing sensory experiences by developing specialized ingredients and technologies for colors, flavors, and extracts in industries worldwide | Food and Beverage Manufacturing | 🇺🇸 Milwaukee | 3,134 |  |
| 30 | [Mercury Marine](https://www.tamtam.ai/c/mercury-marine) (mercurymarine.com)<br>designs, manufactures, distributes marine engines, parts, and accessories for recreational, commercial, and government boating applications worldwide | Manufacturing | 🇺🇸 Fond du Lac | 2,887 | 1939 |
| 31 | [Rehlko](https://www.tamtam.ai/c/rehlko) (rehlko.com)<br>providing global energy resilience solutions with innovative power systems and engines, supporting industrial and residential energy needs worldwide | Manufacturing | 🇺🇸 Milwaukee | 2,710 |  |
| 32 | [The Manitowoc Company](https://www.tamtam.ai/c/the-manitowoc-company) (manitowoc.com)<br>Design and manufacture of crawler, boom, telescoping, and tower cranes with innovative products and strong customer support services worldwide. | Machinery Manufacturing | 🇺🇸 Milwaukee | 2,505 |  |
| 33 | [KI](https://www.tamtam.ai/c/ki) (ki.com)<br>This employee-owned company manufactures innovative furniture and movable wall solutions tailored to education, healthcare, government, and corporate markets worldwide | Office Furniture and Fixtures Manufacturing | 🇺🇸 Green Bay | 2,314 | 1941 |
| 34 | [Enerpac Tool Group](https://www.tamtam.ai/c/enerpac-tool-group) (enerpactoolgroup.com)<br>A global industrial tools and services company specializing in high-pressure hydraulic tools, controlled force products, and heavy load positioning solutions | Industrial Machinery Manufacturing | 🇺🇸 Milwaukee | 2,226 | 1910 |
| 35 | [Versiti Inc.](https://www.tamtam.ai/c/versiti-inc) (versiti.org)<br>Blood health innovators focused on discovery, diagnosis, and treatment, conducting groundbreaking research and providing life-saving donations to communities and healthcare partners nation-wide | Hospitals and Health Care | 🇺🇸 Milwaukee | 2,047 |  |
| 36 | [Rogers Behavioral Health](https://www.tamtam.ai/c/rogers-behavioral-health) (rogersbh.org)<br>Nationally recognized provider of specialized psychiatric care for a variety of mental health disorders in communities across the country | Mental Health Care | 🇺🇸 Oconomowoc | 2,025 | 1907 |
| 37 | [Promega Corporation](https://www.tamtam.ai/c/promega-corporation) (promega.com)<br>Promega Corporation collaborates globally to develop innovative technologies in the life sciences, fostering creativity, sustainability, and meaningful connections with customers | Biotechnology Research | 🇺🇸 Madison | 1,991 | 1978 |
| 38 | [SMC Ltd](https://www.tamtam.ai/c/smc-ltd) (smcltd.com)<br>Offers global contract manufacturing and molding services for medical devices, diagnostics, and pharmaceutical industries, including design, engineering, and assembly. | Medical Equipment Manufacturing | 🇺🇸 Somerset | 1,783 | 1988 |
| 39 | [Sub-Zero Group, Inc.](https://www.tamtam.ai/c/sub-zero-group-inc) (subzero-wolf.com)<br>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. | Manufacturing | 🇺🇸 Madison | 1,775 | 1945 |
| 40 | [Oshkosh Defense](https://www.tamtam.ai/c/oshkosh-defense) (oshkoshdefense.com)<br>Design, production, and sustainment of heavy, medium, and light military vehicles plus mobility systems with global logistics and life cycle fleet support. | Defense and Space Manufacturing | 🇺🇸 Oshkosh | 1,610 | 1917 |
| 41 | [UW School of Medicine and Public Health](https://www.tamtam.ai/c/uw-school-of-medicine-and-public-health) (med.wisc.edu)<br>Advancing health equity through patient care, education, and research to promote healthy individuals and communities in Madison, WI | Higher Education | 🇺🇸 Madison | 1,472 | 1907 |
| 42 | [Pierce Manufacturing](https://www.tamtam.ai/c/pierce-manufacturing) (piercemfg.com)<br>Leading North American manufacturer of custom fire apparatus including pumpers, aerials, rescue trucks, wildland trucks, and tankers Part of Oshkosh Corporation Website: wwwpiercemfgcom | Motor Vehicle Manufacturing | 🇺🇸 Appleton | 1,422 | 1913 |
| 43 | [University of Wisconsin Hospital and Clinics](https://www.tamtam.ai/c/university-of-wisconsin-hospital-and-clinics) (uwhealth.org)<br>A prestigious academic medical center with 471 beds, specializing in cancer treatment, pediatrics, ophthalmology, surgical specialties, and organ transplantation | Hospitals and Health Care | 🇺🇸 Madison | 1,378 |  |
| 44 | [BW Converting](https://www.tamtam.ai/c/bw-converting) (bwconverting.com)<br>Design and manufacture precision machinery for tissue, hygiene, print, packaging, mailing, textiles, and other high-performance industrial applications worldwide. | Industrial Machinery Manufacturing | 🇺🇸 Green Bay | 1,373 | 2021 |
| 45 | [Badger Meter](https://www.tamtam.ai/c/badger-meter) (badgermeter.com)<br>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. | Utilities | 🇺🇸 Milwaukee | 1,378 |  |
| 46 | [Electronic Theatre Controls](https://www.tamtam.ai/c/electronic-theatre-controls) (etcconnect.com)<br>Manufacturer of lighting and rigging technology, developing professional tools for various venues worldwide, with a strong focus on technical and customer service. | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Middleton | 1,367 | 1975 |
| 47 | [Rexnord](https://www.tamtam.ai/c/rexnord) (rexnord.com)<br>A global corporation specializing in mechanical components and smart solutions for industries like automotive, food & beverage, energy, and mining Headquarters in Milwaukee, Wisconsin | Machinery Manufacturing | 🇺🇸 Milwaukee | 1,342 |  |
| 48 | [Greenheck](https://www.tamtam.ai/c/greenheck) (greenheck.com)<br>Global leader in engineering and manufacturing ventilation equipment to improve indoor air quality, safety, and comfort in nonresidential buildings | Industrial Machinery Manufacturing | 🇺🇸 Schofield | 1,311 | 1947 |
| 49 | [Miller Electric Mfg. LLC](https://www.tamtam.ai/c/miller-electric-mfg-llc) (millerwelds.com)<br>A company that manufactures innovative welding products for various industries, providing exceptional customer service and fostering opportunities for career growth | Machinery Manufacturing | 🇺🇸 Appleton | 1,301 | 1929 |
| 50 | [Nelson Global](https://www.tamtam.ai/c/nelson-global) (nelsongp.com)<br>Engineering and manufacturing air, fluid transfer, NVH, structural, acoustic, and thermal management solutions for leading global OEMs. | Industrial Machinery Manufacturing | 🇺🇸 Stoughton | 1,286 | 1939 |

## 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/r-and-d-companies-wisconsin