These Japanese companies are primarily large pharmaceutical and chemical manufacturers, alongside significant medical equipment producers. Takeda, with 37,267 employees, focuses on advancing science to meet patient needs. Olympus Corporation develops medical solutions, while Astellas Pharma specializes in innovative therapies for oncology and other areas. Asahi Kasei provides healthcare products and advanced materials.
The companies listed are predominantly large, established firms, with headquarters concentrated in Tokyo and the surrounding areas. A notable pattern is the strong presence of companies founded in the early to mid-20th century, such as Olympus Corporation (1919), Asahi Kasei (1922), and Toray Industries, Inc. (1926).
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Takedatakeda.com
The company is committed to transforming lives by advancing science, focusing on patient needs, and setting new standards in healthcare |
37,267 | |||
| 2 |
Olympus Corporationolympus-global.com
A global company dedicated to developing medical solutions to improve lives by detecting, preventing, and treating diseases while ensuring public safety |
13,679 | |||
| 3 |
Astellas Pharmaastellas.com
Development and provision of innovative therapies in oncology, ophthalmology, urology, immunology, and women's health addressing unmet medical needs. |
12,472 | |||
| 4 |
Asahi Kaseiasahi-kasei.com
Global company providing healthcare products, residential solutions, and advanced materials to improve life quality and support sustainable development worldwide. |
10,369 | |||
| 5 | 4,786 | ||||
| 6 |
Sysmex Corporationsysmex.co.jp
A global leader in in vitro diagnostics, dedicated to innovating personalized medicine and novel treatments to improve healthcare worldwide |
4,045 | |||
| 7 |
HORIBAhoriba.com
The company provides instruments and systems for various industries including automotive, medical diagnostics, semiconductor manufacturing, and scientific research with proven quality and performance |
3,531 | |||
| 8 |
Toray Industries, Inc.toray.com
Development of fibers, textiles, performance chemicals, carbon fiber composites, environment engineering, pharmaceuticals, and medical products using advanced chemical technologies worldwide. |
3,225 | |||
| 9 |
PHC Holdings Corporationphchd.com
Global healthcare company specializing in diabetes management, healthcare solutions, life sciences, and diagnostics with a mission to improve lives worldwide |
2,610 | |||
| 10 |
Kyowa Kirin Co., Ltd.kyowakirin.com
Development of novel medicines, next-generation antibodies, and cell and gene therapies targeting severe and rare diseases globally. |
2,582 | |||
| 11 |
China Resources (Holdings) Cocrc.com.hk
A group of companies with diverse businesses in Hong Kong and mainland China, originally founded in 1938 as Liow & Company |
2,575 | |||
| 12 |
Teijin Limitedteijin.com
Innovative global group specializing in materials, healthcare, and IT solutions, focused on environmental value, safety, and health consciousness |
1,882 | |||
| 13 |
Santensanten.com
This specialized company in ophthalmology conducts research, development, marketing, and sales of pharmaceuticals, over-the-counter products, and medical devices worldwide |
1,848 | |||
| 14 |
Daiichi Sankyo Japandaiichisankyo.com
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 |
1,811 | |||
| 15 |
Fujifilm Groupholdings.fujifilm.com
A holding company overseeing FUJIFILM Group's diverse businesses, adapting to digitalization by expanding into multiple growth fields beyond traditional photography materials |
1,715 | |||
| 16 |
Sumitomo Chemicalsumitomo-chem.co.jp
A company originally addressing air pollution from copper smelting, now focuses on diverse businesses driven by technological innovation to benefit society |
1,636 | |||
| 17 |
Ajinomoto Co., Inc.ajinomoto.com
Global food and amino acid business, uses bioscience and fine chemical technologies to support healthy lives through sustainable solutions. |
1,523 | |||
| 18 |
Chugai Pharmaceutical Co., Ltd.chugai-pharm.co.jp
Research-based pharmaceutical company in Tokyo with world-class drug discovery capabilities, specializing in antibody engineering technologies to create innovative medical products |
1,188 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 19 |
PENTAX Medicalpentaxmedical.com
Global provider of endoscopic products and services focused on improving patient care through quality, innovation, and simplicity in healthcare delivery |
1,066 | |||
| 20 |
Otsuka Pharmaceutical Co., Ltd.otsuka.co.jp
The company is located in Tokyo and operates in Chiyoda-ku They are likely a business based in Japan |
954 | |||
| 21 |
Fujirebiofujirebio.com
R&D-driven global teams develop new technologies and biomarkers for healthcare, focusing on high quality diagnostic solutions through partnerships and collaborations |
701 | |||
| 22 |
Eisai Co., Ltd.eisai.com
This company focuses on human health care, aiming to relieve anxiety, reduce disparities, and develop innovative products targeting diseases They also support the elimination of neglected tropical diseases |
699 | |||
| 23 |
Terumoterumo.com
A global leader in medical technology providing innovative solutions in vascular intervention, cardio-surgical, blood transfusion, cell therapy, and diabetes care |
641 | |||
| 24 |
Ajinomoto Bio-Pharma Servicesajibio-pharma.com
Contract development and manufacturing organization supporting gene therapy, APIs, large and small molecule production with innovative technologies. |
577 | |||
| 25 |
ARKRAY, Inc.arkray.co.jp
For over 50 years, we have been dedicated to providing high-quality diabetes care products and clinical chemistry equipment to improve patient outcomes |
458 | |||
| 26 |
Kirin Holdings Co., Ltdkirinholdings.com
Established in 1907, we have grown for over 100 years, expanding into beverages, food, pharmaceuticals, and health science fields to enhance quality of life and address social issues |
456 | |||
| 27 |
Nihon Kohden Corporationnihonkohden.co.jp
A leading Japanese manufacturer of medical electronic equipment such as EEG, patient monitors, AEDs, and defibrillators Providing comprehensive healthcare solutions |
449 | |||
| 28 |
ONO PHARMACEUTICAL CO., LTD.ono-pharma.com
Specializes in pharmaceutical research and development, focusing on innovative drug discovery and manufacturing for healthcare improvement. |
439 | |||
| 29 |
CMIC Groupen.cmicgroup.com
A pioneering provider of CRO services in Japan with a full pharmaceutical value-chain offering, including manufacturing, sales, marketing, and healthcare services |
412 | |||
| 30 |
JSR Corporationjsr.co.jp
Development and supply of innovative chemical materials aimed at creating new value and contributing to societal advancement and future generations. |
376 | |||
| 31 |
Terumo Interventional Systemstis.terumo.com
A global leader in minimally invasive medical technologies, offering solutions for coronary, peripheral endovascular, and urological treatments to enhance patient outcomes |
348 | |||
| 32 |
UBE Corporationube.com
Manufacturing technologies delivering safe, environmentally friendly chemical products addressing global environmental issues and contributing to health and enriched society. |
346 | |||
| 33 | 
住友化学（株）sumitomo-chem.co.jp
A chemicals company based in Tokyo, Japan, specializing in the manufacture and distribution of various chemical products |
337 | |||
| 34 |
Linicallinical.com
Global CRO offering full-service drug development, specializing in Phase I-IV studies across various therapeutic areas, with a focus on overcoming regulatory challenges |
321 | |||
| 35 |
Nxera Pharmanxera.life
A technology-driven biopharma developing specialty medicines for global patients, with a strong pipeline focused on neurology, GI, immunology, metabolic disorders, and rare diseases |
280 | |||
| 36 |
Tosoh Corporationtosoh.com
Global chemical company supplying specialty and commodity chemicals to industries including automotive, electronics, bioscience, construction, and environmental sectors. |
188 | |||
| 37 |
Amgen Astellas BioPharmaamgen.co.jp
A joint venture between Amgen and Astellas, providing breakthrough medicines based on science to address unmet medical needs in Japan |
34 | |||
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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.
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