What Plex Systems makes

Plex Systems is a cloud manufacturing software company, not a parts maker. Its product is the Plex Smart Manufacturing Platform, a single-instance, multi-tenant Software-as-a-Service system that runs on the plant floor and in the back office. The platform combines a manufacturing execution system (MES), a cloud-native enterprise resource planning (ERP) system, quality management, supply chain planning, asset performance management, industrial IoT, and analytics in one connected system. Manufacturers use it to track every physical and digital transaction on the shop floor, from raw material receipt through finished-goods shipment, in real time.

For automotive suppliers, the draw is traceability and control. Plex records production genealogy, enforces quality checks in the workflow, and gives corporate management a single view across plants that would otherwise run separate systems. The company positions the platform for discrete and process manufacturing across automotive, aerospace, food and beverage, high-tech and electronics, and general industrial sectors. Plex also offers DemandCaster for supply chain planning and, since 2025, an Elastic MES option that connects to an existing ERP rather than replacing it.

Plex sits inside the automotive original-equipment (OE) supplier ecosystem as a technology provider. It appears in Original Equipment Suppliers Association (OESA) programming, the MEMA division that represents OE suppliers, and its customer base is heavily weighted toward Tier 1 and Tier 2 automotive suppliers serving the major OEMs.

Scale and platform

At the time of its 2021 acquisition, Plex reported more than 700 customers across 37 countries and said the platform processed more than 8 billion transactions per day. That transaction volume reflects a system built for the speed and complexity of high-mix manufacturing rather than for a single plant. The platform is cloud-native and delivered as SaaS, so customers run a common version rather than maintaining on-premise servers.

Plex reports roughly 430 employees as of 2026, most of them in engineering, customer support, and implementation consulting, which fits a software company whose value is in continuous product development and deployment support rather than physical production. Independent revenue estimates put Plex in a band around $150 to 200 million, though the company does not publish standalone figures now that it operates as a Rockwell Automation subsidiary.

Ownership and history

Plex traces to 1989, when it began as an internal IT project at MSP Industries, a Michigan automotive parts manufacturer, before being spun out. The company was founded as an independent software business in 1995 and was known as Plexus Systems before adopting the Plex Systems name in 2009. Apax Partners took a majority interest in 2006. In 2012, Francisco Partners acquired the company, and later that year Accel invested $30 million; a 2014 round led by T. Rowe Price with Francisco Partners and Accel added $50 million.

In 2021, Rockwell Automation, the New York Stock Exchange-listed industrial automation company, acquired Plex from Francisco Partners for $2.22 billion in cash. The deal closed on September 1, 2021, and Plex now operates as a Rockwell Automation business within its software and control segment. Plex is headquartered at 900 Tower Drive in Troy, Michigan.

Known customers

Plex publishes named case studies on its own site, which puts several automotive-supplier relationships on the public record. The following are documented in Plex's own published customer material.

Beyond these, Plex publishes case studies with automotive and industrial suppliers including Argent International, Green Tokai, Coastal Automotive, Creative Foam, FCC North America, Thai Summit, and Swoboda. Several of these customers are themselves profiled in this supplier database.

Certifications and quality

Plex operates the platform as regulated-industry-grade SaaS, and its customers use it to run their own quality systems, including APQP and PPAP workflows and IATF 16949 compliance in automotive plants. Because Plex is a software provider rather than a manufacturing site, plant-level automotive certifications such as IATF 16949 apply to its customers, not to Plex itself. Plex does not publish a specific information-security or quality certificate on the pages reviewed here, so none is claimed on this profile.

Frequently asked questions

What does Plex Systems make?

Plex Systems makes cloud manufacturing software. Its product, the Plex Smart Manufacturing Platform, combines MES, cloud ERP, quality management, supply chain planning, and analytics in one Software-as-a-Service system that manufacturers use to run and track production in real time. Plex is a software company, not a parts manufacturer.

Who owns Plex Systems?

Plex Systems is owned by Rockwell Automation, the New York Stock Exchange-listed industrial automation company, which acquired Plex from Francisco Partners for $2.22 billion in cash in a deal that closed in September 2021. Plex operates as a Rockwell Automation business.

Who are Plex Systems' customers?

Plex reported more than 700 customers across 37 countries at the time of its 2021 acquisition, weighted toward automotive Tier 1 and Tier 2 suppliers. Documented customers include American Axle & Manufacturing, Accuride, Inteva Products, and Dura-Shiloh, all named in Plex's own published case studies.

Where is Plex Systems headquartered?

Plex Systems is headquartered at 900 Tower Drive in Troy, Michigan. The company grew out of a Michigan automotive parts manufacturer, MSP Industries, and has remained based in the Detroit area.

When was Plex Systems founded?

Plex Systems was founded as an independent software company in 1995, having started in 1989 as an internal IT project at MSP Industries. It was known as Plexus Systems before adopting the Plex Systems name in 2009.

How many employees does Plex Systems have?

Plex Systems reports roughly 430 employees as of 2026, concentrated in engineering, customer support, and implementation consulting. It operates as a subsidiary of Rockwell Automation, which employs tens of thousands worldwide.

Last verified September 28, 2026. Is this your company? Request a correction.