# List of companies with in-house R&D in Tokyo

Tamtam tracks 54 companies with in-house R&D headquartered in Tokyo. This list ranks the 30 largest by number of employees on LinkedIn, led by NTT DATA, Inc., Komatsu and NTT DATA. Their median headcount is 3,102. Half of them were founded in 1946 or later.

These companies are large, established firms with in-house R&D, predominantly headquartered in Tokyo. A significant number operate in IT services and consulting, alongside manufacturing and retail. For instance, NTT DATA is a global IT services provider, Komatsu innovates in machinery manufacturing, and Takeda focuses on pharmaceutical manufacturing.

The data reveals a concentration of large corporations founded between the late 19th and mid-20th centuries. Hitachi, founded in 1910, specializes in IT services, while Kao EMEA & Americas is a leading manufacturer of hygiene and beauty products. Sony creates technology and entertainment, and UNIQLO is a major retail holding company.

🇯🇵 Tokyo · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [NTT DATA, Inc.](https://www.tamtam.ai/c/ntt-data-inc) (global.ntt)<br>A global IT services provider offering a wide range of business and technology solutions as it transitions to NTT DATA | IT Services and IT Consulting | 🇯🇵 Tokyo | 140,000 |  |
| 2 | [Komatsu](https://www.tamtam.ai/c/komatsu) (komatsu.jp)<br>Innovating manufacturing and technology to create value for a sustainable future where people, businesses, and the planet flourish together | Machinery Manufacturing | 🇯🇵 Tokyo | 60,000 | 1921 |
| 3 | [NTT DATA](https://www.tamtam.ai/c/ntt-data) (nttdata.com)<br>Providing IT and business consulting, digital transformation, managed services, and industry solutions to clients worldwide for long-term success. | IT Services and IT Consulting | 🇯🇵 Tokyo | 48,385 |  |
| 4 | [Hitachi](https://www.tamtam.ai/c/hitachi) (hitachi.com)<br>A technology and innovation company committed to creating a more sustainable society through advanced social infrastructure systems and improving quality of life | IT Services and IT Consulting | 🇯🇵 Tokyo | 40,513 | 1910 |
| 5 | [Takeda](https://www.tamtam.ai/c/takeda) (takeda.com)<br>The company is committed to transforming lives by advancing science, focusing on patient needs, and setting new standards in healthcare | Pharmaceutical Manufacturing | 🇯🇵 Tokyo | 37,267 | 1781 |
| 6 | [Kao EMEA & Americas](https://www.tamtam.ai/c/kao-emea-and-americas) (kao.com)<br>Leading manufacturer of hygiene, beauty, and health products with premium brands in consumer care, salon, cosmetics, and luxury skincare sectors. | Personal Care Product Manufacturing | 🇯🇵 Tokyo | 34,000 |  |
| 7 | [Sony](https://www.tamtam.ai/c/sony) (sony.com)<br>Creates groundbreaking technology, entertainment, and services across various industries, aiming to evoke emotion and push boundaries for people worldwide. | Entertainment Providers | 🇯🇵 Tokyo | 24,935 | 1946 |
| 8 | [UNIQLO](https://www.tamtam.ai/c/uniqlo) (fastretailing.com)<br>A leading Japanese retail holding company offering high-quality, innovative apparel under the concept of LifeWear in over 25 markets worldwide | Retail | 🇯🇵 Tokyo | 19,984 | 1984 |
| 9 | [NEC Corporation](https://www.tamtam.ai/c/nec-corporation) (nec.com)<br>An industry leader in IT and network integration, focusing on sustainable solutions for safety, security, and efficiency in a rapidly changing world | IT Services and IT Consulting | 🇯🇵 Tokyo | 17,980 | 1899 |
| 10 | [Asahi Kasei](https://www.tamtam.ai/c/asahi-kasei) (asahi-kasei.com)<br>Global company providing healthcare products, residential solutions, and advanced materials to improve life quality and support sustainable development worldwide. | Chemical Manufacturing | 🇯🇵 Tokyo | 10,369 | 1922 |
| 11 | [Yokogawa](https://www.tamtam.ai/c/yokogawa) (yokogawa.com)<br>Provides measurement, control, information solutions across diverse industries; optimizes production, assets, supply chains with digital technologies; enables autonomous operations. | Automation Machinery Manufacturing | 🇯🇵 Tokyo | 8,675 |  |
| 12 | [TrendAI](https://www.tamtam.ai/c/trendai) (trendmicro.com)<br>Global cybersecurity company providing AI-powered protection and risk management for enterprises, governments, and consumers across diverse digital environments. | Computer and Network Security | 🇯🇵 Tokyo | 8,060 |  |
| 13 | [AGC Group](https://www.tamtam.ai/c/agc-group) (agc.com)<br>supplier of flat, automotive, display glass, chemicals, ceramics, and high-tech materials with global operations and strong innovation focus | Glass, Ceramics and Concrete Manufacturing | 🇯🇵 Tokyo | 4,786 |  |
| 14 | [Advantest](https://www.tamtam.ai/c/advantest) (advantest.com)<br>Leading manufacturer of automatic test and measurement equipment for semiconductor design and production, serving applications such as 5G, IoT, AI, and more globally | Semiconductor Manufacturing | 🇯🇵 Tokyo | 3,901 | 1954 |
| 15 | [Rakuten Symphony](https://www.tamtam.ai/c/rakuten-symphony) (rakuten.com)<br>Global B2B services provider in mobile telco industry, offering cloud-based international mobile services and innovative telco platform, with operations in 30 countries | Telecommunications | 🇯🇵 Tokyo | 3,102 |  |
| 16 | [Fast Retailing](https://www.tamtam.ai/c/fast-retailing) (fastretailing.com)<br>Global apparel retail company operating multiple brands, designing and selling innovative clothing with a focus on quality, simplicity, and longevity. | Retail | 🇯🇵 Tokyo | 3,062 | 1963 |
| 17 | [Panasonic Connect](https://www.tamtam.ai/c/panasonic-connect) (connect.panasonic.com)<br>A company dedicated to providing innovative B2B solutions, driving sustainability and societal advancement by connecting with customers to solve challenges and create value | Transportation, Logistics, Supply Chain and Storage | 🇯🇵 Tokyo | 2,476 | 2022 |
| 18 | [JSP](https://www.tamtam.ai/c/jsp) (jsp.com)<br>Global provider of innovative high function, high value impact energy management materials for automotive, HVAC, packaging, sports, and consumer goods markets | Plastics Manufacturing | 🇯🇵 Tokyo | 2,380 | 1962 |
| 19 | [Daiichi Sankyo Japan](https://www.tamtam.ai/c/daiichi-sankyo-japan) (daiichisankyo.com)<br>An innovative global healthcare company with over 120 years of experience, focusing on discovering and delivering new standards of care for cancer, cardiovascular, and other diseases | Pharmaceutical Manufacturing | 🇯🇵 Tokyo | 1,811 | 2007 |
| 20 | [Penta-Ocean Construction Company Limited](https://www.tamtam.ai/c/penta-ocean-construction-company-limited) (penta-ocean.co.jp)<br>A Japanese construction firm specializing in marine works and land reclamation, with offices in multiple countries and involvement in various major projects globally | Construction | 🇯🇵 Tokyo | 1,503 | 1896 |
| 21 | [DNP Dai Nippon Printing Co., Ltd.](https://www.tamtam.ai/c/dnp-dai-nippon-printing-co-ltd) (global.dnp)<br>Established in 1876, this company specializes in printing technology for various sectors such as packaging, decorative materials, electronic components, and information media supplies | Printing Services | 🇯🇵 Tokyo | 1,242 | 1876 |
| 22 | [IHI Corporation](https://www.tamtam.ai/c/ihi-corporation) (ihi.co.jp)<br>A Japanese company with a history dating back to 1853, specializing in shipbuilding, aircraft engines, industrial machinery, bridges, and power station boilers | Machinery Manufacturing | 🇯🇵 Tokyo | 1,239 | 1853 |
| 23 | [PENTAX Medical](https://www.tamtam.ai/c/pentax-medical) (pentaxmedical.com)<br>Global provider of endoscopic products and services focused on improving patient care through quality, innovation, and simplicity in healthcare delivery | Medical Equipment Manufacturing | 🇯🇵 Tokyo | 1,066 | 1919 |
| 24 | [KIOXIA Group](https://www.tamtam.ai/c/kioxia-group) (kioxia-holdings.com)<br>A global leader in memory solutions, specializing in flash memory and SSDs, driving innovation with cutting-edge technology for various high-density applications | Semiconductor Manufacturing | 🇯🇵 Tokyo | 729 | 2017 |
| 25 | [Taisei Corporation 大成建設株式会社](https://www.tamtam.ai/c/taisei-corporation) (taisei.co.jp)<br>A leading Japanese general construction contractor with expertise in building construction, civil engineering, and real estate development Operating internationally with multiple overseas offices | Construction | 🇯🇵 Tokyo | 675 | 1873 |
| 26 | [Shinryo Corporation](https://www.tamtam.ai/c/shinryo-corporation) (shinryo.com)<br>Shinryo Corporation is a company that specializes in providing technology solutions and services Make sure to visit their official website for accurate information | Specialty Trade Contractors | 🇯🇵 Tokyo | 646 |  |
| 27 | [STANLEY ELECTRIC CO., LTD.](https://www.tamtam.ai/c/stanley-electric-co-ltd) (stanley-electric.com)<br>A leading electrical manufacturer specializing in automotive lighting, optoelectronics, and UV products, with a focus on maximizing the value of light | Appliances, Electrical, and Electronics Manufacturing | 🇯🇵 Tokyo | 624 | 1920 |
| 28 | [i-PRO](https://www.tamtam.ai/c/i-pro) (i-pro.com)<br>The company provides customizable, high-quality camera systems for mission-critical applications, incorporating AI technology for predictive video analysis and tailored solutions | Technology, Information and Internet | 🇯🇵 Tokyo | 525 | 2019 |
| 29 | [Nippon Steel Engineering Co., Ltd.](https://www.tamtam.ai/c/nippon-steel-engineering-co-ltd) (eng.nipponsteel.com)<br>Designing, constructing, and operating various plants and machinery internationally, specializing in steel, environmental, energy, marine engineering, and building construction solutions | Engineering Services | 🇯🇵 Tokyo | 519 | 1974 |
| 30 | [SmartNews](https://www.tamtam.ai/c/smartnews) (careers.smartnews.com)<br>A global leader in news discovery, using machine-learning technology and editorial expertise to deliver accurate, timely information from 3,000+ publishing partners worldwide | Technology, Information and Media | 🇯🇵 Tokyo | 498 | 2012 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

## More company lists in Tokyo

- [The largest companies in Tokyo](https://www.tamtam.ai/l/largest-companies-tokyo) (162)
- [Multinational companies in Tokyo](https://www.tamtam.ai/l/multinational-companies-tokyo) (99)
- [Publicly traded companies in Tokyo](https://www.tamtam.ai/l/publicly-traded-companies-tokyo) (43)
- [Manufacturers in Tokyo](https://www.tamtam.ai/l/manufacturers-tokyo) (39)
- [Corporate groups and holding companies in Tokyo](https://www.tamtam.ai/l/holding-companies-tokyo) (32)
- [Hardware manufacturers in Tokyo](https://www.tamtam.ai/l/hardware-companies-tokyo) (26)

## The same list elsewhere in Japan

- [Companies with in-house R&D in Japan](https://www.tamtam.ai/l/r-and-d-companies-japan) (287)

## The same list elsewhere

- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,346)
- [Companies with in-house R&D in Asia](https://www.tamtam.ai/l/r-and-d-companies-in-asia) (4,166)

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Source: https://www.tamtam.ai/l/r-and-d-companies-tokyo