Seiko es un gigante que asusta:
Seiko Group
Seiko Holdings Corporation (SEIKO, headquartered in Tokyo)
Seiko Watch Corporation (marketing watches): Seiko (Grand Seiko, Dolce & Exceline, Brightz, Lukia, Prospex, iu, Ruse, Spirit, Alpinist, Ignition, Premier, Velatura, Coutura, Arctura, Sportura, Criteria, Rivoli, Vivace, etc.), Credor, Galante, Wired, Wired XYZ, Alba, Pulsar, Lorus. Seiko Watch is a planning and marketing company.
Seiko Clock Inc. (development, manufacturing, sales and repair of clocks)
Seiko Sports Life Co., Ltd. (golf clubs, stopwatches, etc.)
Seiko Time Systems Inc. (system clocks, etc.)
Seiko Service Center Co., Ltd. (repair and after service for watches)
Seiko Business Services Inc. (general affairs & human resources)
Seiko Precision Inc. (electronic/micromechatronics devices, printers, information equipment, system clocks and production equipment, etc.)
Seiko NPC Corporation (semiconductors)
Seiko Jewelry Co., Ltd. (jewelry)
Seiko Optical Products Co., Ltd. (eyeglasses - lenses & frames)
Ohara Inc. (specialty optical glass; Seiko owns 32.2% TYO: 5218)
Wako Co., Ltd. (upscale specialty retailer)
Cronos Inc. (upscale specialty retailer)
etc.
Seiko Instruments Inc. (SII, Subsidiary of Seiko Holdings, headquartered in Chiba)
SII NanoTechnology Inc.
Morioka Seiko Instruments Inc.
SII Network Systems Inc.
SII Mobile Communications Inc.
SII Data Service Corp.
SII Printek Inc.
SII Microtechno Inc.
SII Micro Parts Ltd.
SII Micro Precision Inc.
Epolead Services Inc.
Seiko I Infotech Inc.
Seiko I Techno Research Co., Ltd.
Seiko EG&G Co., Ltd.
City Service Co., Ltd.
etc.
Seiko Epson Corporation (EPSON, headquartered in Suwa, Nagano)
Epson Sales Japan Corporation
Epson Toyocom Corporation
Epson Direct Corporation
Epson Service Corporation
Epson Atmix Corporation
Epson Software Development Laboratory Inc.
Yasu Semiconductor Corporation
Seiko Epson Contact Lens Corporation
Seiko Lens Service Center Corporation
Epson Imaging Devices Corporation
Orient Watch Co. Ltd.
etc.