| # | Company | Employees |
|---|---|---|
| 1 |
NTT DATA, Inc.global.ntt
A global IT services provider offering a wide range of business and technology solutions as it transitions to NTT DATA |
140,000 |
| 2 |
NTT DATAnttdata.com
Providing IT and business consulting, digital transformation, managed services, and industry solutions to clients worldwide for long-term success. |
48,385 |
| 3 | 7,257 | |
| 4 |
Chiyoda Corporationchiyodacorp.com
Global engineering company focused on energy and environment, aiming to be top-tier provider through innovative solutions and sustainable growth strategies |
3,984 |
| 5 |
Toyo Engineering Corporationtoyo-eng.com
Engineering globally to construct plants, focusing on quality, safety, environment, and cost Creating sustainable solutions for energy infrastructure with innovation |
3,002 |
| 6 |
Accenture Japanaccenture.com
A global professional services company implementing digital technologies to optimize operations, increase revenue, improve citizen services, and drive visible results for clients worldwide |
2,907 |
| 7 |
ABeam Consultingabeam.com
Global consulting firm specializing in business strategy, digital technologies, operational services, and helping clients achieve competitive digital transformation and new business models. |
2,712 |
| 8 |
Baycurrentbaycurrent.co.jp
BayCurrent Consulting, Inc is a Japanese company with a focus on consulting services, with a diverse team of executives and outside directors |
2,086 |
| 9 |
KPMGジャパン/KPMG Japankpmg.com
A group of 7 professional firms in Japan, covering auditing, tax, and advisory services Collaborates with KPMG's global network for comprehensive solutions |
1,753 |
| 10 |
日本アイ・ビー・エム(株)ibm.com
A retail company based in Tokyo, Japan, specializing in providing various products and services to customers in the local area |
1,679 |
| 11 |
Future Focus Infotech Private Limitedfocusinfotech.com
Providing strategic digital transformation and IT consulting services with global expertise, customer focus, and innovative, scalable technology solutions. |
1,601 |
| 12 |
Eurotechnology Japaneurotechnology.com
A leading technology consulting firm in Tokyo, specializing in telecommunications, software, semiconductor, environmental, and financial industries Acquiring, selling, and analyzing Japanese companies |
1,288 |
| 13 |
TechnoPro Holdings, Inc.technoproholdings.com
Leading technology-focused staffing and services group with expertise in various technical fields, providing engineering staffing, subcontracting, consulting, and recruiting services to clients globally |
1,286 |
| 14 |
SCSK Corporationscsk.jp
Providing faster, accurate IT services with expert problem-solving across industries to deliver optimal, client-focused technology solutions. |
1,147 |
| 15 |
FPT Japanfptsoftware.com
Provider of technology and IT services in Japan, offering a proactive and friendly work environment to over 2600 skilled IT engineers and employees |
1,053 |
| 16 |
SHIFTshiftinc.jp
SHIFT offers software solutions, quality assurance services, and support for digital initiatives to help organizations overcome IT challenges and drive innovation |
962 |
| 17 |
Dentsu Digitaldentsudigital.co.jp
Leading provider of digital marketing services in Japan, offering strategy, development, and execution of next-gen marketing and IT platforms, along with DX consulting for business innovation |
930 |
| 18 |
EY Japaneyjapan.jp
EY Japan consists of independent member firms collaborating to provide cutting-edge global services in assurance, advisory, tax, and transaction services |
920 |
| 19 |
Oriental Consultants Globalocglobal.jp
A global consulting firm in Japan specializing in infrastructure development and project management for various sectors worldwide |
809 |
| 20 |
デロイトトーマツコンサルティング(合同)deloitte.com
A management consulting company based in Tokyo, Japan, specializing in providing strategic advice and solutions to businesses and organizations |
802 |
| 21 |
MC Digital|エムシーデジタルmcdigital.jp
A technology company backed by Mitsubishi Corporation, specializing in digital transformation consulting, solutions, and AI SaaS to accelerate progress across industries |
649 |
| 22 |
Vision Consulting, Inc.visioncon-global.com
Innovative consulting firm from Japan focusing on breaking industry norms, improving business value, and creating new, impactful ventures globally |
646 |
| 23 |
Monstarlabmonstar-lab.com
A digital consultancy founded in Tokyo, Monstarlab offers end-to-end digital solutions, expert strategy, delivery, and a variety of tech services globally |
634 |
| 24 |
電通総研_DENTSU SOKEN INC.dentsusoken.com
Supporting digital transformation for society and businesses through innovative solutions in four key areas, creating new value for the future |
574 |
| 25 | 450 | |
| 26 |
Mynet Inc.mynet.co.jp
The company provides smartphone app services, focusing on combining internet communication and gaming to enhance real-life interactions and enrich people's lives |
46 |
| 27 |
MATCHAcompany.matcha-jp.com
An inbound media company showcasing the charms of Japan to the world, preserving valuable culture for future generations |
43 |
| 28 |
wesionaryTEAM Co. Ltd.wesionary.team
The company collaborates on tech and business challenges by co-creating solutions, embracing innovation in a dynamic environment |
31 |
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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 Oct 24, 2026.
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