SII Group Updates Its Sustainability Website
The sustainability website has been updated and published with fiscal 2025 performance data and activities. For details, please visit the sustainability website.
Seiko Instruments Inc.
セイコーインスツル株式会社
Ticker
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Listed market
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Country
Employees (consolidated)
2,598
Related companies
15
§01
Basic information
- Head office
- 1-8 Nakase, Mihama-ku, Chiba City, Chiba Prefecture
- Chief executive
- Yoichi Endo
- Capital
- 9,756,000,000 (97 100 million)
- Employees (non-consolidated)
- 666 people
- Employees (consolidated)
- 2,598 people
- Start date
- 1937-09-07
- End date
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Websites
§03
Business
Micro batteriesQuartz oscillatorsHigh-performance metal productsRare-earth magnetsPrecision cutting partsMachine tools high-frequency spindleMiniature ball bearingsThermal printerInkjet headWireless sensor networkRadiation/physical-chemical measurementMetronome tunerMetronome watchDevelopment, manufacturing, and sales of electronic componentsDevelopment, manufacturing, and sales of precision partsDevelopment, manufacturing, and sales of printing devicesAgricultural house monitoring service
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Names without a link are companies not yet registered in OpenBizGraph
§05
Network
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§06
History
Founded as a wristwatch manufacturing company, Hattori Clock Store, as Seiko Instruments Co., Ltd. (formerly Seiko Seiko Kogyo Co., Ltd.)
Daini Seikosha Co., Ltd. (currently Seiko Instruments Inc.) was established as the wristwatch manufacturer for K. Hattori & Co., Ltd.
Completed the headquarters factory in Kameido, Tokyo
Completed head office factory in Kameido, Tokyo.
Seiko was responsible for official timing at the 18th Olympic Games in Tokyo
Served as Official Timer for the Tokyo Olympics.
Achieved a top placement in the Swiss Nushatel Observatory Clock Accuracy Competition.
Seiko products captured the highest awards in the Observatoire Cantonal de Neuchâtel competition held in Switzerland.
Established Precision Engineering Ltd. (now Seiko Instruments Trading (H.K.) Ltd.) as an electronic components manufacturing company (currently sells electronic components, etc.).
Established Precision Engineering Ltd. as the electronic components manufacturing company (currently Seiko Instruments (H.K.) Ltd., selling electronic components.)
Released the world's first quartz watch equipped with a CMOS IC.
Established Morioka Seiko Industry Co., Ltd. as a wristwatch manufacturing company.
Released the world’s first quartz watch using a CMOS IC.
Established Morioka Seiko Instruments Inc., the watch manufacturing company.
Established Singapore Time Pte. Ltd. (now Seiko Instruments Singapore Pte. Ltd.) as a wristwatch manufacturing company (currently manufactures thermal printer products).
Established Singapore Time Pte. Ltd. (currently Seiko Instruments Singapore Pte. Ltd.) as the watch manufacturing company. (currently manufacturing Thermal Printers.)
Established Seiko Instruments U.S.A., Inc. as a diversified product sales company in North America.
Established Seiko Instruments U.S.A., Inc. as sales company of diversified products in North America.
Established Seiko Easy & G (Inc.) as a joint venture with EG&G INC. (now PerkinElmer Instruments) in the United States.
Established Seiko Instruments GmbH in Germany as a diversified product sales company in Europe.
Renamed the company to Seiko Electronics Industry Co., Ltd.
Established Seiko EG&G Co., Ltd. as a joint company between Seiko Instruments Inc. and EG&G Inc. (currently Perkin Elmer Instruments).
Established Seiko Instruments GmbH in Germany as sales company of diversified products in Europe.
Company name was officially changed to Seiko Instruments & Electronics Ltd.
Established Seiko Precision Co., Ltd. (now Seiko Instruments Taiwan Inc.) as an electronic components sales company.
Established Seiko Precision Co., Ltd. as the electronic components sales company (currently Seiko Instruments Taiwan Inc.)
Established Seiko Instruments (Thailand) as a watch parts manufacturing company (currently manufactures HDD parts, etc.).
Established Seiko Instruments (Thailand) as the watch components manufacturing company (currently manufacturing HDD components, etc.)
Established Dalian Precision Electronics Co., Ltd. as a watch parts manufacturing company (currently manufactures watch parts and automotive parts).
Established organization_ex001 as the integrated brand of the Seiko Electronics Industry Group.
New corporate brand name "organization_ex001-1" adopted as official acronym of Seiko Instruments Inc.
Moved the headquarters building to Chiba, Makuhari New City.
SII Head Office was relocated to Makuhari.
Renamed the company to Seiko Instruments Co., Ltd.
Company name was officially changed to Seiko Instruments Inc.
Established SII PrintTech Co., Ltd. as a manufacturer and seller of inkjet print head products.
Established SII Printek Inc. as the manufacturing and sales company of printhead products.
Renamed the company to Seiko Instruments (Inc.).
Established the 'Shizashiki Luxury Watch Workshop' within Morioka Seiko Industry to handle the complete production of mechanical wristwatches.
Opened Shizukuishi Watch Studio, Japan’s only fully-integrated production system for mechanical wristwatches.
Established Seiko Electronics Commerce (Shanghai) Co., Ltd. as an electronic components sales company.
Established Seiko Instruments (Shanghai) Inc. as the electronic components sales company.
Established Seiko Electronics Technology (Shanghai) Co., Ltd. as an electronic components manufacturing company.
Established Seiko Instruments Technology (Shanghai) Inc. as the electronic components manufacturing company.
Becomes a 100% owned subsidiary of Seiko Holdings Inc. (currently Seiko Group Inc.)
Became a wholly-owned subsidiary of Seiko Holdings Corporation.(currently Seiko Group Corporation.)
Established Seiko Instruments Crystal Technology Co., Ltd. as a crystal-related product manufacturing company.
Established SII Crystal Technology Inc. as the manufacturing company of quartz crystal products.
Established Seiko Instruments Semiconductor Co., Ltd. as a semiconductor product manufacturing and sales company.
Established SII Semiconductor Corporation as the manufacturing and sales company of semiconductor products. In January 2018, the equity method will be applied and the company name will be changed to ABLIC Inc.
Transferred to an equity method-applied company and renamed to Aiburik Co., Ltd.
Transferred the watch business to Seiko Watch Co., Ltd.
Watch business transferred to Seiko Watch Corporation
§07
News
SII Group Updates Its Sustainability Website
Seiko EG&G LIMS-Smart Glasses Fukushima
Seiko EG&G Co., Ltd., a Seiko Instruments group company, has introduced a chemical analysis support system that integrates a Laboratory Information Management System (LIMS) with smart glasses to support decommissioning operations at the Fukushima Daiichi Nuclear Power Station. The system enables daily radioactivity and water quality analyses of various samples to be performed accurately and promptly, addressing the massive volume of analysis required during decommissioning.
廃炉作業を支える化学分析支援システム LIMS
LIMSとスマートグラスを組み合わせた化学分析支援システムが福島第一原発の廃炉作業で導入され、試料の放射能・水質分析を正確かつ迅速に行うために開発された。開発はセイコー・イージーアンドジー株式会社が東京電力HDの要望を受けて行い、分析業務の統合管理を実現した。
Free SII Label Solution for MP-Series Mobile Printers Launched
Seiko Instruments Inc. has begun offering “SII Label Solution,” a business label-printing solution for its MP-series mobile printers, free of charge. The solution consists of SII Label Creator, for creating labels on Windows PCs, and SII Label Print, for printing from smartphones and tablets. The separate creation and printing workflows are suited to a range of operations. The service aims to reduce implementation costs and operating burdens and encourage label use in logistics, retail, manufacturing, healthcare, and other settings.
Polishing Tiny Internal Surfaces
Many products rely on quiet rotation, smooth movement, and long life, which depends on precision in unseen areas. One critical area is the internal surface of holes, such as those for rotating shafts, bearings, and component fits. Polishing these tiny surfaces supports the high precision required in modern manufacturing.
内側の精度で精密製造を支える
目に見えない穴の内面の精度が製品性能に大きく影響する。セイコーインスツルは内面研削盤でミクロン単位の精度を実現し、信頼性を支えている。 その技術は家電から半導体装置まで幅広い産業に貢献している。
Notice of Summer Holiday
Our company will be closed for its summer holiday from Saturday, August 8, through Sunday, August 16, 2026. We apologize for any inconvenience and appreciate your understanding.
Limited-Edition Mickey Mouse Metronome Watch to Launch
Seiko Instruments Inc. will launch a limited-edition “Metronome Watch Mickey Mouse Conductor Edition,” featuring a Mickey Mouse design, in limited quantities through Yamano Music on Thursday, June 25, 2026. In addition to its watch function, the product has a metronome and reference-tone functions for everyday use and musical settings. Advance reservations begin at 10:00 a.m. on Monday, June 8, 2026, through the Yamano Music online shop and selected stores.
Seiko Instruments Launches New “Technology Topics” Page
Seiko Instruments has launched “Technology Topics,” a new section of its corporate website introducing its technologies and value. The page clearly explains product and technology features and their contributions to society, and also provides details on core technologies and development objectives.
New Technology Topics Page Launched
The company has launched a new “Technology Topics” section on its website to explain products, technologies, and social contributions across its business areas in an accessible way for readers without specialized knowledge. The page explores how technologies work and the aims behind their development, seeking to communicate the company’s strengths and value concretely. Visitors are invited to view the page.
§08
Public records
National Tax Agency basic information8040001003651
Source: National Tax Agency Corporate Number Publication Site, basic three items
- Trade name
- セイコーインスツル株式会社
- Trade name (kana)
- セイコーインスツル
- Name in English
- Seiko Instruments Inc.
- Corporation type
- 301
- Address
- 〒261-0023 千葉県千葉市美浜区中瀬１丁目８番地
- Postal code
- 2610023
- Prefecture code
- 12
- City code
- 106
- Address outside Japan
- Prefecture in English
- Chiba
- City in English
- 8, Nakase 1-chome, Mihama-ku, Chiba-shi
- Address outside Japan in English
- Corporate number assignment date
- 2015-10-05
- Update date
- 2025-04-15
- Change date
- 2015-10-05
- Registry closure date
- Reason for registry closure
- Successor corporate number
- Details of the change
- Latest record
- 1
- Excluded from search
- 0
- Processing type
- 01
- Correction type
- 1
- Trade name image ID
- Address image ID
- Sequence number
- 1219883
METI gBizINFO8040001003651
Source: gBizINFO (Ministry of Economy, Trade and Industry)
- Corporate number
- 8040001003651
- Trade name
- セイコーインスツル株式会社
- Trade name (kana)
- セイコーインスツル
- Trade name (alphabet)
- Seiko Instruments Inc.
- Registry closure date
- Reason for registry closure
- Registered address
- 千葉県千葉市美浜区中瀬１丁目８番地
- Postal code
- 2610023
- Prefecture
- 千葉県
- Prefecture code
- 12
- City or district
- 千葉市美浜区
- City code
- 106
- Street address
- 中瀬１丁目８番地
- Organisation type
- 301
- Processing type
- 01
- Correction type
- 1
- Status
- Representative
- Capital
- Employees
- 673
- Employees (male)
- 575
- Employees (female)
- 131
- Business summary
- 電子デバイス、精密デバイス、プリンティングデバイスの開発・製造・販売
- Website URL
- http://www.sii.co.jp/
- Year founded
- Business category
- E:製造業
- Date established
- Unified government qualification - grade
- Unified government qualification - business items
- Update date
- 2025-04-15
- Key information
- 8040001003651
§09
Sources & updates
DOMAINOwn domain：Yes
UPDATED2026-09-29 18:53 · Model: gpt-oss-20b(99)