Tokyo System House Co., Ltd.

Tokyo System House Co., Ltd. (abbreviated TSH) is an independent Japanese information-technology services company headquartered in Nishi-Gotanda, Shinagawa-ku, Tokyo, with a second office, TSH Kansai, in Kobe. It was established in November 1976 as an independent systems house and has since positioned itself as an "IT service company for the customer," combining consulting, system development, operation and maintenance. The company's core business is comprehensive services related to computer utilization. Its best-documented vertical is financial-business system development support, marketed under the FotaS service line, where it serves banks, trust banks, shinkin (credit) banks and insurance companies. For these clients it provides engineering staffing, contract development, PMO and employee-substitute support, covering upstream processes from planning and requirements definition through design, development, operation and maintenance. The company states it has worked with financial institutions since its founding, with relationships spanning decades. Beyond finance, TSH works on legacy modernization and migration — notably COBOL asset migration and mainframe/UNIX migration — and on newer technology areas including AI, robotics, cloud, mobile and open source. It has developed its own products and services, including "じぶんBOUS-AI" (Jibun BOUS-AI), an AI-based disaster-prevention offering used in community evacuation drills, and AI-assisted COBOL system support solutions. It is a certified partner of AWS (Select Tier Services Partner), Google Cloud (Build Partner), Salesforce (certified consulting partner) and Blue Prism (Silver Delivery Provider), and holds ISO/IEC 27001, ISO 9001 and JAPiCO (JIS Q 15001) certifications. As of October 2025 the company reported revenue of 4.83 billion yen and 220 employees, with paid-in capital of 179.9 million yen. It is led by Representative Director Tomoyuki Hayashi. TSH remains privately held and independent, describing itself as an independent systems house since its founding.

Tokyo System House Co., Ltd. was established in November 1976 as an independent systems house. From its founding it engaged in comprehensive services related to computer utilization, and it states that it has maintained relationships with financial institutions since that time. The company's corporate creed is that the greatest purpose is to be loved by users through its services and to earn their trust and confidence. Over the decades TSH built up experience and business know-how in system development, operation and maintenance, particularly in the financial sector. Its financial-business system development support service, later branded FotaS, describes more than 40 years of track record since the company's founding, providing engineering and contract development to banks, trust banks, shinkin banks and insurers, and covering upstream processes from planning through design, development, operation and maintenance. Documented client engagements include system and data migration accompanying a shinkin bank merger, joint-center migration, AML system construction, and EUC development and maintenance for a trust bank. As the IT landscape shifted, TSH expanded into newer technology areas — AI, robotics, cloud, mobile and open source — while continuing to serve legacy environments. It developed its own products and services, including the AI-based disaster-prevention offering じぶんBOUS-AI, used in community evacuation drills, and AI-assisted COBOL system support solutions presented at industry events such as CEATEC. The company also works on legacy modernization and migration, including COBOL asset migration and moving away from Fujitsu UNIX environments. TSH holds ISO/IEC 27001:2022/JIS Q 27001:2023 and ISO 9001:2015/JIS Q 9001:2015 certifications and the JAPiCO mark (JIS Q 15001:2017), and is a certified partner of AWS (Select Tier Services Partner), Google Cloud (Build Partner), Salesforce (certified consulting partner) and Blue Prism (Silver Delivery Provider). It is a member of organizations including the Tokyo Chamber of Commerce and Industry (Shinagawa branch), the Japan Software Association, the COBOL Consortium and the OSS Consortium. As of October 2025 the company reported revenue of 4.83 billion yen, 220 employees and paid-in capital of 179.9 million yen. Its head office is in Nishi-Gotanda, Shinagawa-ku, Tokyo, with a Kansai office in Kobe. It remains a privately held, independent company led by Representative Director Tomoyuki Hayashi.

• 2026

  Participated in Togoshi Ginza shopping street disaster-prevention event using じぶんBOUS-AI

• 2026

  Announced exhibition at CEATEC 2026 with AI-assisted COBOL system support solutions

• 2025

  Reported revenue of 4.83 billion yen and 220 employees

• 2023

  FotaS financial business system development support service page dated

• 1976

  Founded as an independent systems house in Japan

Independent Japanese IT services company focused on customer-centric system development, financial-sector engineering and legacy modernization.

• FotaS financial business system development support

  Engineering and contract development for banks, trust banks, shinkin banks and insurers, covering planning through operation and maintenance.

• じぶんBOUS-AI

  AI-based disaster-prevention solution used for simple evacuation drills in community settings.

• COBOL asset migration solutions

  Solutions addressing COBOL legacy asset challenges, including AI-assisted support.

1. 1東京システムハウス株式会社 | お客様のためのITサービスカンパニーtsh-world.co.jp
2. 2会社案内 | 東京システムハウス株式会社tsh-world.co.jp
3. 3CSR | 東京システムハウス株式会社tsh-world.co.jp
4. 4金融業務システム開発支援 | FotaStsh-world.co.jp
5. 5Tokyo System House Co., Ltd. (Japan) - Wikidatawikidata.org