A Clear Focus.
And a Legacy of Delivering a Difference.

Delivering a difference

Since 1972

Like other Tier 1 suppliers, MPC provides thermoplastic components and assemblies to the automotive industry. But that’s where the similarities end.
Where others claim to be experts in everything, we focus. Every facet of our organization has been meticulously designed, aligned and optimized for one purpose: to provide superior production capabilities to major automotive OEMs.
From the practical, reliable design of our parts to the depth of our offerings to our singularly-focused manufacturing processes, execution excellence is the driving force behind everything we do. It’s why we’re able to make such a difference for the major automotive OEMs we serve.
"Every day we work together to solve challenges, add value, and deliver world class products and services. Knowing our customers have lots of choices, we strive to deliver more. We want to be your supplier of choice!"
Russ Bush, Vice President, Global Sales and Marketing

Our Legacy

A History of Exceeding Expectations

Founded in March of 1972 by the Brost family in Jay Brost’s garage, we got off to a fast start in the first year by developing, patenting and manufacturing an automotive check valve for the Ford Motor Company.
Since then, major automotive OEMs have trusted MPC to deliver in ways that make a difference in the marketplace. And the same entrepreneurial spirit that inspired Jay Brost more than 45 years ago is still alive and well and shared by each one of our nearly 1,500 employees.

Focused on building a better business.

MPC leads the industry with its ability to improvise and rally around critical customer needs and time constraints whether designing, manufacturing or both.
The responsiveness of a family-owned business coupled with the muscle of a global player makes MPC unique in our ability to follow through. Combine that with our location in America’s Heartland, and you have a company that will work hand-in-hand with you to deliver goods quickly and at low cost.

Awards & Certificates

We're proud of our achievements

GM Supplier of the Year Award
GM Supplier Quality Excellence Award
2013, 2014
Honda Excellence in Value Award
Top Workplaces

Leading by Example

Planet-Friendly Plastics

MPC leads the industry in cam covers produced using 100% post-consumer materials, so they can be recycled and reborn after use.
As a best-in-class automotive supplier, we recognize it’s our duty to not just keep up with sustainability and emissions requirements, but get ahead of them. So the only footprint we’ll leave is on the industry.

A Focus on Philanthropy

  • Community Action Team
  • S.M.I.L.E.S. (Special Methods In Learning Equine Skills)
  • Local College Scholarship Program Support
  • Relay for Life of Walworth County
  • Local Sporting Events
  • Richland Hospital Foundation


Our neck of the woods

  • Walworth, WI
  • Prairie du Chien, WI
  • Richland Center, WI
  • Southfield, MI
  • Morrison, TN
  • Nogales, AZ
  • Santa Ana, Sonora, Mexico
  • Nagoya, Japan
  • Janesville, WI
Corporate Headquarters • Manufacturing • Sales

With our headquarters in Walworth, WI, your daily commute will be on wide-open, rustic roads. You’ll live in a close-knit community among some of the Midwest’s finest vacation spots, like Lake Geneva. You’re also close enough to take in the culture, restaurants and sports venues of the big cities, like Chicago, Milwaukee and Madison. That’s our world. ISO 14001 Certified MPC Environmental Policy IATF Certification - Building 2 IATF Certification - Building 4

  • 820 Wisconsin St.
    Walworth, WI 53184
  • (262)-275-5791
High Volume Automation

Our Prairie du Chien facility specializes in valve and cap production. Prairie du Chien IATF Certification

  • 63095 Vineyard Rd.
    Prairie du Chien, WI 53821
  • 608-326-4333
Extruded Tubing and Tube Assemblies

Our Richland Center, WI facility specializes in extruded tubing manufacturing and tube assemblies. Richland Center IATF Certification

  • 350 Industrial Dr
    Richland Center, WI 53581
  • (608) 647-2663
Sales and Marketing

Our Southfield, MI facility is home to our Sales and Marketing team.

  • 29200 Northwestern Hwy # 250
    Southfield, MI 48034
  • (248) 799-8949
Injection Molding and Automated Assembly

Our Morrison, TN facility specializes in injection molding and automated assembly, featuring Mega Assemblies and General Molded Assemblies. Morrison IATF Certification Morrison CCC Certification

  • 120 Brost Dr
    Morrison, TN 37357
  • (931) 635-4600
Extruded tubing and injection molding

Our Nogales, AZ facility specializes in extruded tubing and injection molding, featuring tube assemblies, reservoirs, and general molded assemblies.

  • 1600 W La Quinta Rd, Ste 3B
    Nogales, AZ 85621
  • 520-281-5979
Extruded tubing and injection molding

Our Santa Ana, Sonora, Mexico facility specializes in extruded tubing and injection molding. Mexico ISO 14,001 Certification APS IATF Certification

  • APS Autopartes de Precision
    de Santana S. de R.L. de C.V.
    Avenida Serna Y Calle 13
    Santa Ana Sonora Mexico 84600
  • 011-52-641-324-6000
Injection mold tubing

MPC Japan K.K., in Nagoya, Japan, provides local engineering support to its automotive customers. MPC Japan K.K., allows MPC to provide local communication, faster development and outstanding project management to its customers in the region.

  • 名古屋市中区錦1-18-24 HF伏見ビル4階
    HF Fushimi Building 4th Floor
    1-18-24 Nishiki, Naka-Ku,
    Nagoya, Aichi 460-0003 Japan
  • 052-300-8275 Ext.1001
Plastics Joining and Assembly

Our Janesville, WI facility specializes in plastics joining and assembly of reservoirs, coolant assemblies, and general molded assemblies. Janesville IATF Certification

  • 2929 W Venture Dr
    Janesville, WI 53546
  • (262) 275-5791

Good News Travels Fast

MPC Walworth - Top Workplace

6/10/2014 - Our Walworth facility was recognized as one of the top places to work in Southeastern Wisconsin. As a company we participate in the Milwaukee Journal Sentinel’s Best Places to Work Survey every year. Based on the responses given by our employees our site has been recognized. This is a great achievement! We want to say thank you to all of our employees at the Walworth facility for making MPC such a great place to work! For more information on this exciting news please visit the link below. http://www.jsonline.com/business/2014-top-workplaces-in-southeastern-wisconsin-b99268357z1-258949991.html

Richland Center Facility Receives Excellence Award

10/7/2013 - The award is given to specific supplier locations and only our top-performing suppliers are eligible to receive this award. Suppliers who receive this award have met or exceeded a stringent set of quality performance criteria and have achieved the cross-functional support of the entire GM organization. Overall, GM is striving to move from good to great as a company and achieving this goal depends largely on the quality of our products. Product quality plays a major role in all of this and we view it as the foundation for the overall customer experience. We have made a lot of progress in recent years improving product quality and recently achieving the top spot in the J.D. Power Initial Quality Study. Our continued progress is directly related to your progress and a shared commitment to quality.


  • Is MPC Hiring?
    When MPC has open positions, the position will be listed on our jobs website. The required skills and educational background are listed on the job description. You will be able to upload your resume and apply for jobs directly on the site.
  • What positions are available?
    We hire for hourly manufacturing/assembly, skilled trades, interns, our Leadership Development Program (LDP) and direct hires. Please visit our jobs website for a list of current opportunities.
  • How do I find out more about a particular department at MPC?
    The Careers section provides an overview of every department within the company, as well as examples of positions within each department.
  • How long does it take for my application to be reviewed?
    Typically, it takes 7-10 days for applications to be reviewed once they are submitted.
  • Does MPC offer internships?
    Yes, MPC offers internships in a variety of areas including Engineering, Finance, HR, IT and Purchasing. We recruit from many colleges within the state. For more information on our internships and the colleges we recruit from, visit the internship section on our jobs site.