MET Co., Ltd.
Manufacture of semiconductor and LCD related equipment

Sumisei Sangyo Co., Ltd.
Sales of all types of materials and machinery parts

Sumisei Engineering Co., Ltd.
Design, drawing and engineering services

Sumisei Techno Service Co., Ltd.
Maintenance services for all types of industrial machinery

Sumisei Hydraulic Systems Co., Ltd.
Production, maintenance and sales of aerospace and hydraulic equipment

Sumisei Service Co., Ltd.
Employee welfare-related services

Shinsen Seiki Co., Ltd.
Processing of all types of machinery parts

Crossbow Japan, Ltd.
Sales of wireless sensor networks and inertial units

Surface Technology Systems Plc.
Production and sales of plasma processing system

Silicon Sensing Systems Ltd.
Production and sales of motion sensors

Sumitomo Precision USA, Inc.
Production and sales of heat exchangers for aerospace

Ningbo SPP Hydraulics Co., Ltd.
Production and sales of QT pump

Aviocast, Inc.
Production and sales of casting products

Primaxx, Inc.
Production and sales of MEMS etch release equipment