OUTLINE

COMPANY PROFILE

(As of January 2026)

Company Name	ARS Co., Ltd.
Established	August 16, 1972
Capital	JPY 98 million
Representative	Tsutomu Ouchi, President & CEO
Number of Employees	About 450
Head Office Address	7 Nagō, Motomiya, Motomiya City, Fukushima 969-1175, Japan
Contact	TEL +81-243-33-2326 (Main)
Business Activities	Contract manufacturing and processing of electronic components and devices, with a core focus on semiconductor packaging, wafer testing, and PCB assembly Development, manufacturing, and testing of semiconductor and MEMS packages Semiconductor wafer testing (electrical testing) and laser trimming PCB assembly, electronic equipment assembly, and electrical product manufacturing Development, manufacturing, and sales of switching power supplies Microcontroller-Based Embedded System Development and Design Manufacturing of medical devices Workforce outsourcing of operators and engineers, development of business systems, and development of products and services
Business Locations	Nagō Area, Motomiya City, Fukushima Semiconductor package assembly and final testing, PCB assembly, Assembly of electronic equipment and various modules Arai Area, Motomiya City, Fukushima Wafer testing, Laser trimming processes Tokyo Satellite Office Design and development of switching power supplies Embedded System Center Microcontroller-Based Embedded System Development and Design
Certifications & Licenses	ISO9001, ISO14001, ISO13485, IATF16949 RCJS-5-1（IECQ ESD） Medical Device Manufacturing License [Fukushima Prefecture \| Registration No. 07BZ200087] Worker Dispatching Business License [Ministry of Health, Labour and Welfare \| License No. Haken 07-300602]
Affiliated Companies	Ouchi Kosan Co., Ltd., Miyakawa Denki Co., Ltd., CreArs Co., Ltd.

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HISTORY

1972	August	Established ARS Precision Co., Ltd. Telecommunications (crossbar switch assembly) and semiconductor package assembly (DIP14/16)
1983	October	Established ARS Electronics Co., Ltd. (former name) PCB assembly and finished product assembly
1989	January	Established A.B.C. Co., Ltd. Established an integrated process for wafer testing, laser trimming, and assembly
1997	October	Obtained ISO 9002 certification
1997	December	Established ARS Micro Devices Co., Ltd. Established logic, LCD, and analog wafer testing capabilities
2001	May	Obtained ISO 14001 certification
2001	August	Merged into ARS Electronics Co., Ltd. Changed company name to “ARS Electronics Co., Ltd.” and integrated group companies
2002	November	Obtained ISO 9001 certification
2012	August	Changed company name to ARS Co., Ltd.
2014	March	Obtained ANSI ESD S20.20 certification
2018	December	Obtained IATF 16949 certification
2019	January	Launched the power supply business Development, manufacturing, and sales of switching power supplies and hybrid ICs
2019	June	Obtained ISO 13485 certification
2025	May	Obtained RCJS-5-1 (IECQ ESD) certification
2026	January	Established the Embedded System Business Development and design of microcontroller embedded systems