# Automotive manufacturers and suppliers headquartered in Wisconsin

Tamtam tracks 33 automotive manufacturers and suppliers headquartered in Wisconsin. This list ranks all of them by number of employees on LinkedIn, led by Harley-Davidson Motor Company, Oshkosh Corporation and Clarios. Their median headcount is 365. Half of them were founded in 1945 or later. The most common headquarters are Milwaukee (5) and Green Bay (2).

This selection of large companies in Wisconsin primarily consists of manufacturers in the automotive and industrial equipment sectors. Many are well-established, with founding dates stretching back to the early 20th century. Notable examples include Harley-Davidson Motor Company, known for its iconic motorcycles, and Oshkosh Corporation, which designs industrial equipment. Clarios specializes in advanced energy storage solutions, while Modine Manufacturing Company provides thermal technology for vehicles.

A significant concentration of these companies, such as Harley-Davidson Motor Company and Strattec Security Corporation, are headquartered in Milwaukee. Other key locations include Oshkosh, home to Oshkosh Corporation and Oshkosh Defense, and Stoughton, where Nelson Global and Stoughton Trailers, LLC are based. This pattern suggests a strong regional presence for industrial manufacturing, particularly in the automotive supply chain.

🇺🇸 Wisconsin · 33 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |
| 2 | [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 |
| 3 | [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 |  |
| 4 | [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 |
| 5 | [REV Group, Inc](https://www.tamtam.ai/c/rev-group-inc) (revgroup.com)<br>Specialty vehicle designer and manufacturer, offering customized solutions for fire & emergency, commercial, and recreational applications to a diverse customer base in the United States | Motor Vehicle Manufacturing | 🇺🇸 Brookfield | 2,380 | 2010 |
| 6 | [KMC](https://www.tamtam.ai/c/kmc) (kmcstampings.com)<br>Established in 1908, this company specializes in manufacturing custom and standard metal products for global OEMs with a focus on quality and innovation | Manufacturing | 🇺🇸 Port Washington | 2,091 | 1908 |
| 7 | [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 |
| 8 | [Waupaca Foundry](https://www.tamtam.ai/c/waupaca-foundry) (waupacafoundry.com)<br>The company is a leading producer of high-quality iron castings, utilizing vertical green sand molding and generations of expertise for durable and innovative products | Mining | 🇺🇸 Waupaca | 1,534 | 1871 |
| 9 | [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 |
| 10 | [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 |
| 11 | [MEC (Mayville Engineering Company, Inc.)](https://www.tamtam.ai/c/mec-mayville-engineering-company-inc) (mecinc.com)<br>A leading manufacturing partner specializing in prototyping, fabrication, coating, assembly, and aftermarket components for various industries Operating across 20 facilities in seven states | Industrial Machinery Manufacturing | 🇺🇸 Mayville | 1,130 | 1945 |
| 12 | [Husco](https://www.tamtam.ai/c/husco) (husco.com)<br>Family-owned company with 75 years of experience designing hydraulic and electro-mechanical control systems for Automotive and Off-Highway equipment Globally recognized for innovation and employee excellence | Industrial Machinery Manufacturing | 🇺🇸 Waukesha | 896 | 1985 |
| 13 | [Stoughton Trailers, LLC](https://www.tamtam.ai/c/stoughton-trailers-llc) (stoughtontrailers.com)<br>A family-owned company in Wisconsin that designs, manufactures, and markets semi-truck trailers and specialty transportation equipment, offering build, finance, rental, and fleet management solutions | Truck Transportation | 🇺🇸 Stoughton | 773 | 1961 |
| 14 | [Strattec Security Corporation](https://www.tamtam.ai/c/strattec-security-corporation) (strattec.com)<br>A global leader in automotive security products, specializing in locks, keys, access control systems, and aftermarket support for customers worldwide | Motor Vehicle Manufacturing | 🇺🇸 Milwaukee | 687 | 1908 |
| 15 | [ACS - Engineer. Integrate. Build.](https://www.tamtam.ai/c/acs-engineer-integrate-build) (acscm.com)<br>ACS designs, engineers, and builds innovative equipment, machines, controls, and facilities for industry leaders in automotive, aerospace, and manufacturing sectors globally | Construction | 🇺🇸 Verona | 496 | 1994 |
| 16 | [Aebi Schmidt USA](https://www.tamtam.ai/c/aebi-schmidt-usa) (aebi-schmidt.com)<br>Global leader in providing intelligent solutions for clean and safe infrastructure, challenging terrains, and agricultural needs through a wide range of high-quality equipment and services | Machinery Manufacturing | 🇺🇸 Chilton | 401 |  |
| 17 | [GO Riteway Transportation Group](https://www.tamtam.ai/c/go-riteway-transportation-group) (goriteway.com)<br>Transportation solutions provider offering a range of vehicles for various occasions and long-term partnerships with institutions, companies, schools, and airport services | Ground Passenger Transportation | 🇺🇸 Oak Creek | 365 | 1957 |
| 18 | [Lamers Bus Lines](https://www.tamtam.ai/c/lamers-bus-lines) (golamers.com)<br>Providing safe, affordable school bus and motor coach transportation services across Wisconsin and the Midwest since 1944. | Truck Transportation | 🇺🇸 Green Bay | 365 | 1944 |
| 19 | [Signicast Investment Castings](https://www.tamtam.ai/c/signicast-investment-castings) (signicast.com)<br>Provider of commercial investment castings, delivering quality products with unmatched speed and customer focus, resulting in faster time to market and lower total costs | Manufacturing | 🇺🇸 Hartford | 349 | 1959 |
| 20 | [Seats Inc.](https://www.tamtam.ai/c/seats-inc) (seatsinc.com)<br>Manufacturer of specialty seating for transportation, off-highway, and industrial equipment, serving various industries with OEM and contract manufacturing services | Manufacturing | 🇺🇸 Reedsburg | 331 | 1952 |
| 21 | [Strattec Security Corporation - México](https://www.tamtam.ai/c/strattec-security-corporation-mexico) (strattec.com)<br>A leading provider of innovative security solutions for the automotive industry, offering high-quality products like advanced key systems, access control products, and electronic locks | Motor Vehicle Parts Manufacturing | 🇺🇸 Milwaukee | 315 | 1908 |
| 22 | [Madison-Kipp Corporation](https://www.tamtam.ai/c/madison-kipp-corporation) (madison-kipp.com)<br>An established aluminum die casting company with expertise in design, die casting, machining, and assembly for automotive and other commercial markets | Motor Vehicle Manufacturing | 🇺🇸 Madison | 311 | 1898 |
| 23 | [ETE REMAN](https://www.tamtam.ai/c/ete-reman) (etereman.com)<br>A leading remanufacturer of automatic transmissions for import and domestic cars & trucks, with over 30 years of experience based in Milwaukee, WI | Motor Vehicle Manufacturing | 🇺🇸 Milwaukee | 282 | 1985 |
| 24 | [Wells Vehicle Electronics](https://www.tamtam.ai/c/wells-vehicle-electronics) (wellsve.com)<br>A leading global provider of advanced vehicle electronics solutions for original equipment and replacement applications in various industries around the world | Motor Vehicle Manufacturing | 🇺🇸 Fond du Lac | 266 | 1903 |
| 25 | [J.W. Speaker Corporation](https://www.tamtam.ai/c/j-w-speaker-corporation) (jwspeaker.com)<br>A company specializing in innovative and high-quality vehicle lighting solutions for OEM and aftermarket customers, driven by a dedication to excellence and value | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Germantown | 265 | 1935 |
| 26 | [Ritus Corporation](https://www.tamtam.ai/c/ritus-corporation) (ritus.com)<br>Specializing in custom-molded products for automotive, industrial, marine, and recreational markets, offering a wide range of rubber and plastic molding services | Plastics Manufacturing | 🇺🇸 Milwaukee | 119 | 1963 |
| 27 | [Saelens LLC](https://www.tamtam.ai/c/saelens-llc) (diamondprecision.com)<br>Manufacturer of precision machined components and CNC contract machining services for commercial and industrial applications, with over three decades of experience | Motor Vehicle Manufacturing | 🇺🇸 Johnson Creek | 63 | 1974 |
| 28 | [AAA Sales & Engineering](https://www.tamtam.ai/c/aaa-sales-and-engineering) (aaase.com)<br>A precision machining company founded in 1968, providing high-quality products for transportation industries with full-service capabilities, global supply chain, and certifications for quality and environmental standards | Machinery Manufacturing | 🇺🇸 Oak Creek | 59 | 1968 |
| 29 | [Vision Plastics, Inc.](https://www.tamtam.ai/c/vision-plastics-inc) (visionplastics.net)<br>Vision Plastics provides high-quality plastic injection molded parts to various industries, offering design engineering assistance, mold maintenance, secondary operations, and quality assurance solutions | Plastics Manufacturing | 🇺🇸 Delavan | 40 | 1997 |
| 30 | [A&J Mobility](https://www.tamtam.ai/c/a-and-j-mobility) (aandjmobility.com)<br>The company specializes in providing innovative mobility solutions with a focus on superior service and customer satisfaction, fulfilling automotive mobility dreams since 1983 | Motor Vehicle Manufacturing | 🇺🇸 Valders | 28 | 1975 |
| 31 | [Orchid Monroe](https://www.tamtam.ai/c/orchid-monroe) (orchidinternational.com)<br>Supplier of electro-magnetic stampings and drive assemblies for various industries, offering advanced processes, turnkey product integration, design services, and innovative engineering solutions | Motor Vehicle Manufacturing | 🇺🇸 Monroe | 25 |  |
| 32 | [RevTech Manufacturing](https://www.tamtam.ai/c/revtech-manufacturing) (revtechmfg.com)<br>Specializing in plastic product development, injection molding, automotive parts, sporting goods, electronics housings, two-shot molding, and color matched parts with over 20 years experience | Plastics Manufacturing | 🇺🇸 Kenosha | 7 | 2003 |
| 33 | [Bay Fabrication Inc.](https://www.tamtam.ai/c/bay-fabrication-inc) (bayfabrication.com)<br>A global supplier of custom insulation products for OEMs, specializing in thermal insulation for industrial, commercial, and automotive markets | Wholesale Building Materials | 🇺🇸 Green Bay | 3 |  |

## 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/automotive-companies-wisconsin