The plastics manufacturing companies listed here are primarily mid-sized to large firms, with a strong emphasis on custom solutions for various industries. Many specialize in injection molding and thermoforming, serving sectors like medical, automotive, and consumer goods. For instance, Bemis Manufacturing Company produces custom plastic products including healthcare components, while MGS Mfg. Group focuses on healthcare manufacturing solutions from design to assembly. HellermannTyton North America is a global leader in cable management products, and Prent Corporation specializes in custom plastic packaging for medical and electronics industries.
A notable pattern is the concentration of these companies across different cities within Wisconsin, indicating a distributed industrial base rather than a single hub. Several companies, such as Flambeau, Inc. and Kaysun Corporation, were founded in the mid-20th century, suggesting a long-standing presence and evolution in the plastics sector.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Bemis Manufacturing Companybemismfg.com
Manufacturing custom plastic products including toilet seats, healthcare components, and precision parts for consumer, commercial, medical, and industrial markets worldwide. |
919 | |||
| 2 |
MGS Mfg. Groupmgsmfg.com
Global provider of healthcare manufacturing solutions with vertically integrated capabilities from design to assembly, creating breakthrough innovations for Pharma, Diagnostic, and MedTech companies |
813 | |||
| 3 |
HellermannTyton North Americahellermanntyton.us
A global leader in cable management and protection products and identification systems across various industries, with a focus on innovative solutions and customer satisfaction |
781 | |||
| 4 |
EVCO Plasticsevcoplastics.com
Innovative plastic injection molding company with global presence, offering precision molding, large part molding, custom design, and mold building services |
637 | |||
| 5 |
Flambeau, Inc.flambeau.com
The company specializes in manufacturing a diverse range of plastic products, offering design assistance, tooling, contract manufacturing, and various retail divisions worldwide |
553 | |||
| 6 |
Prent Corporationprent.com
Global leader in designing and manufacturing custom plastic, rigid thermoform packaging for medical, electronics, and consumer industries with worldwide manufacturing facilities |
520 | |||
| 7 |
SACO AEI Polymerssacoaei.com
A technology-driven manufacturer providing innovative polymer solutions for various industries, focusing on quality, efficiency, and customer value with global facilities |
202 | |||
| 8 |
Parker Plastics, Inc.parker-plastics.com
Custom blow molder specializing in plastic bottles and containers, offering customer-driven packaging solutions with manufacturing facilities in multiple states |
201 | |||
| 9 |
Grayline LLCgraylineinc.com
A manufacturer specializing in engineered flexible polymer tubing, offering regular and heat shrinkable options in various sizes, materials, and colors for custom applications |
149 | |||
| 10 |
Commercial Plasticsxtenindustries.com
A contract manufacturer and injection molder providing comprehensive services for product design, manufacturing, finishing, and distribution with a focus on quality and efficiency |
134 | |||
| 11 |
Sussex IMsussexim.com
A custom injection molder and automated assembly company offering innovative solutions for molding, decorating, and assembly needs with a focus on value-added operations |
130 | |||
| 12 |
MasterMold, LLCmastermoldllc.com
A Wisconsin-based manufacturer specializing in engineered compressed/molded fiberglass and Class A liquid paint coatings for various industries worldwide |
127 | |||
| 13 |
Ritus Corporationritus.com
Specializing in custom-molded products for automotive, industrial, marine, and recreational markets, offering a wide range of rubber and plastic molding services |
119 | |||
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. | |||||
| 14 |
Kaysun Corporationkaysun.com
Specializing in highly engineered plastic products and assemblies, this company collaborates with clients to tackle complex applications with precision and innovation |
113 | |||
| 15 |
Five Star Plasticsfive-star-plastics.com
Plastics product development organization offering rapid tooling, prototyping, design/engineering solutions, urethane models, injection molding, welding, printing, assembly, with focus on customer service and quality |
75 | |||
| 16 |
TenXtenxmanufacturing.com
A pioneering manufacturing services company offering a wide range of solutions including Injection Molding, CNC Machining, 3D Printing, and more with a focus on precision and excellence |
65 | |||
| 17 |
Interfacialifllc.com
A leader in developing advanced materials and manufacturing processes for various markets, offering services in development, specialty materials, and engineered substrates |
62 | |||
| 18 |
Sintex Wausaukee Composites, Inc.wauscomp.com
Manufacturer of composite plastic components for OEM customers in various industries, offering design, prototyping, manufacturing, and assembly services with a focus on excellence and innovation |
41 | |||
| 19 |
Vision Plastics, Inc.visionplastics.net
Vision Plastics provides high-quality plastic injection molded parts to various industries, offering design engineering assistance, mold maintenance, secondary operations, and quality assurance solutions |
40 | |||
| 20 |
Seljan Companyseljan.com
A family-owned manufacturing company specializing in stamping, fabrication, rotational molding, injection molding, and more with a focus on customer service |
31 | |||
| 21 |
Eagle Performance Plastics, Inc.eagle-plastics.com
A leading supplier of custom-machined plastic components for various industries, offering precision CNC machining and fabrication services with a focus on quality and reliability |
31 | |||
| 22 |
Custom Service Plastics, Inc.csplastics.com
The company specializes in developing custom engineering solutions, utilizing a core team of manufacturing engineers and a network of consultants to ensure cost-effective, high-quality results |
22 | |||
| 23 |
Plasticraft Corporationplasticraftcorp.com
Specializing in injection molded parts and assemblies, we strive to deliver high-quality plastic components and ensure precision in our work |
21 | |||
| 24 |
Kracor, a division of Yamaha Marine Systems Company, Inc.kracor.com
Manufacturer of high-quality rotational molded plastic products for various industries, known for innovative design, advanced technology, and exceptional customer service |
13 | |||
| 25 |
Aqua Poly Equipment Companyaquapoly.com
We specialize in helping the Plastics Industry select and implement products and services to improve efficiency in production processes |
9 | |||
| 26 |
RevTech Manufacturingrevtechmfg.com
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 |
7 | |||
| 27 |
R.A.D. Groupradgroupinc.com
A molding company specializing in silicone, rubber, and plastic components, offering a wide range of process options and serving various industries with quality parts and assemblies |
5 | |||
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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 13, 2026.
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The same list elsewhere in United States
- Plastics Manufacturing companies in the United States 410
- Plastics Manufacturing companies in Michigan 41
- Plastics Manufacturing companies in Ohio 36
- Plastics Manufacturing companies in California 25