Rex Systems Incorporated

Rex Systems Incorporated, doing business as Rex Systems Inc., is a small business manufacturer of military electronic components and assemblies based in Chippewa Falls, Wisconsin that operates as a prime contractor (99% of recent awards) on Department of Defense procurement, competing predominantly full-and-open without set-aside designations. The company is a for-profit Subchapter S Corporation with a subsidiary, Rex Service Corp, and over 45 years of operational history dating to 1973.

Rex Systems manufactures and supplies precision electronic components critical to defense logistics and military readiness, including circuit card assemblies, mounting bases, annunciators, terminal board assemblies, relay assemblies, switch assemblies, cable assemblies, telephone sets and repair services, keyer-power supplies, and specialized electronic modules. Representative prime work includes a $514,080 firm fixed-price purchase order from the Naval Supply Systems Command (awarded October 2025) for telephone set repair services with a 95-day turnaround commitment; a $107,800 DLA Land and Maritime purchase order (November 2025) for circuit card assembly manufacture under an unrestricted RFQ; a $399,100 DLA Aviation purchase order (May 2022) for 134 wave shaping modules under a Total Small Business set-aside; and a $675,000 Naval Supply Systems Command purchase order (September 2021) for alternating current motors. The company also holds five single-award indefinite delivery contracts with DLA Land and Maritime and DLA Aviation, including a $855,132.52 IDC for electrical mounting bases running through June 2027 and two $250,000 IDCs for circuit card assemblies.

Customer concentration is heavily weighted to defense logistics and Navy supply: the top five customers account for 76% of recent award count, led by DLA Land and Maritime (287 awards, $9.1 million combined potential value), Naval Supply Systems Command (144 awards, $11.1 million combined potential value), and DLA Aviation (120 awards, $8.6 million combined potential value). The two rankings track closely, with Naval Supply Systems Command anchoring the largest share of potential dollars while DLA Land and Maritime drives highest volume. Activity has been volatile—20 awards in 2022, 15 in 2023, 32 in 2024, 20 in 2025, with only 2 awards recorded in 2026 as of the source date—but the recompete cliff is minimal: only one award (the Naval Supply Systems Command telephone set repair contract worth $514 thousand) reaches completion within the next twenty-four months.

Rex Systems' top parent vehicles are single- and multiple-award IDCs: Indefinite Delivery Contract SP090001D9720 (41 task orders), Indefinite Delivery Contract SP045104D0502 (10 task orders), and three other DLA contracts averaging 7 to 10 task orders each. The company's capability portfolio is heavily concentrated in printed circuit board and electronic component manufacturing across NAICS 334412 (Bare Printed Circuit Board Manufacturing, 132 awards), 334413 (Printed Circuit Assembly Manufacturing, 107 awards), and 334419 (Other Electronic Component Manufacturing, 92 awards); PSC concentration follows, with Electrical and Electronic Assemblies (304 awards) and Miscellaneous Communication Equipment (109 awards) dominating. Rex Systems operates in a narrow, capital-intensive manufacturing niche serving defense supply chains; awards are typically purchase orders and delivery orders ranging from $500 to $675,000, placed by four primary customers (DLA Land and Maritime, DLA Aviation, Naval Supply Systems Command, and the broader Navy).

In its subcontractor role (1% of recent awards), Rex Systems supplies electronic components to BAE Systems Information and Electronic Systems Integration on F-16 support equipment spares and test sets, and to Raytheon on transformer and current flex assemblies. The company's sub footprint is minimal relative to its prime position and reflects specialized component supply rather than systems integration.

RSI was founded on the manufacturing of high quality, Legacy reliable electronic components and systems. Our application and use of technology has evolved, but our commitment to quality has stayed core. Legacy products include assemblies to repair and maintain gun and missile fire control radar, submarine sonar, fathometers, signal data processors, tactical communication radios, and identification friend or foe (IFF) radar sets. RSI expertise lies in short run, fast turnaround manufacturing and testing of high reliability electronic assemblies.