QTron Inc., established in 1993 and headquartered in San Diego, California, was a privately held Electronics Manufacturing Services (EMS) provider specializing in quick-turn, volume production, and test services for printed circuit board (PCB) and box-build assemblies. The company focused on delivering high-quality, innovative, and cost-effective end-to-end electronics solutions to various industries, including consumer electronics, automotive, telecommunications, and defense.
In 2001, QTron was acquired by Plexus Corp., a Neenah, Wisconsin-based EMS company, to expand its West Coast presence and enhance its wireless communication business. At the time of acquisition, QTron had approximately 370 employees and annual revenues between $70 million and $80 million. The acquisition provided Plexus with an immediate manufacturing presence in Southern California, a targeted expansion area.
Prior to the acquisition, QTron experienced significant growth. In 2001, the company constructed a 200,000-square-foot facility in Poway, California, to increase capacity for producing RF and wireless products. This expansion was part of a strategy to accommodate the rapid growth in revenues, which were projected to reach $160 million in 2001, up from $61 million in 2000.
QTron's leadership team included CEO Lynn Brock, who joined the company in 1999 and played a pivotal role in its turnaround and growth. Under his leadership, the company focused on serving high-tech OEMs in the San Diego/Southern California area, particularly in the wireless communication sector.
The EMS industry during this period saw significant consolidation, with midsize companies like Plexus acquiring smaller firms such as QTron to enhance technical capabilities and strengthen balance sheets. This trend was driven by the challenging economic environment and the need for EMS providers to expand their manufacturing footprints in key U.S. technology hubs.
As of July 2025, QTron Inc. operates as a subsidiary of Plexus Corp., continuing to provide specialized EMS solutions with a focus on quick-turn, volume production, and test services for PCBs and box-build assemblies.
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