|Seiko Holdings Corporation||Responsible for such functions as consolidation, legal tasks, management of intellectual properties, group publicity and investors relations|
|Seiko Watch Corporation||Planning, development and manufacturing of watches and other products and domestic and overseas sales|
|Seiko Instruments Inc.||Development, manufacturing and sales of electronic components, precision components and printing devices|
|Seiko NPC Corporation||Development, manufacturing and marketing of integrated circuits (IC)|
|Seiko I Techno Research Inc.
|Instrumental analysis (surface analysis, morphological observation, and thermal analysis), microfabrication, and consulting of materials, processes, and devices|
|Seiko Solutions Inc.||Development, manufacturing, sales, maintenance, services and consultations for the hardware and the software relating with information systems and network services|
|WAKO Co., Ltd.||Sales of watches, jewelry, accessories, interior supplies, art goods and crafts, glasses and foodstuffs|