# Top 50 professional services firms in Japan

Tamtam tracks 69 professional services firms headquartered in Japan. This list ranks the 50 largest by number of employees on LinkedIn, led by NTT DATA, dentsu and Nomura. Their median headcount is 802. Half of them were founded in 1997 or later. The most common headquarters are Tokyo (13).

These professional services firms in Japan primarily focus on IT services, business consulting, and staffing. The list includes large corporations like NTT DATA, which provides IT and business consulting, and dentsu, an advertising services giant. Other prominent firms are Nomura, a global financial services group, and PwC Japan, which offers auditing, consulting, and tax services. Many of these companies have substantial employee counts, indicating well-established operations.

A notable pattern among these firms is their strong concentration in Tokyo, with several also headquartered in Chiyoda-ku. The companies span various sectors, from Chiyoda Corporation in oil and gas engineering to JAC Recruitment in staffing, reflecting a diverse professional services landscape.

🇯🇵 Japan · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |  |
| 2 | [dentsu](https://www.tamtam.ai/c/dentsu) (dentsu.com)<br>Helping brands predict future opportunities and create growth paths by connecting brand, content, commerce, and experience with creativity. | Advertising Services | 🇯🇵 Tokyo | 19,298 |  |
| 3 | [Nomura](https://www.tamtam.ai/c/nomura) (nomura.com)<br>A global financial services group connecting markets East & West, serving individuals, institutions, corporates, and governments with creative solutions and thought leadership | Financial Services | 🇯🇵 Tokyo | 16,671 |  |
| 4 | [NRI Group](https://www.tamtam.ai/c/nri-group) (nri.com)<br>Providing insight-driven research, consulting, and managed services including IT solutions, cybersecurity, and digital marketing to enhance client performance. | IT Services and IT Consulting | 🇯🇵 Chiyoda-ku | 7,257 | 1965 |
| 5 | [PwC Japan](https://www.tamtam.ai/c/pwc-japan) (pwc.com)<br>The company is a professional services network in Japan, providing auditing, consulting, advisory, tax, and legal services to address client needs | Business Consulting and Services | 🇯🇵 Chiyoda | 4,027 | 1949 |
| 6 | [Chiyoda Corporation](https://www.tamtam.ai/c/chiyoda-corporation) (chiyodacorp.com)<br>Global engineering company focused on energy and environment, aiming to be top-tier provider through innovative solutions and sustainable growth strategies | Oil and Gas | 🇯🇵 Yokohama | 3,984 | 1948 |
| 7 | [JAC Recruitment](https://www.tamtam.ai/c/jac-recruitment) (jacgroup.com)<br>Global recruitment consultancy providing specialized services for high-income job positions, with a focus on technology-related roles, interim management solutions, and recruitment process optimization | Staffing and Recruiting | 🇯🇵 Chiyoda-ku | 3,301 | 1975 |
| 8 | [Toyo Engineering Corporation](https://www.tamtam.ai/c/toyo-engineering-corporation) (toyo-eng.com)<br>Engineering globally to construct plants, focusing on quality, safety, environment, and cost Creating sustainable solutions for energy infrastructure with innovation | Construction | 🇯🇵 Narashino | 3,002 | 1961 |
| 9 | [Accenture Japan](https://www.tamtam.ai/c/accenture-japan) (accenture.com)<br>A global professional services company implementing digital technologies to optimize operations, increase revenue, improve citizen services, and drive visible results for clients worldwide | Business Consulting and Services | 🇯🇵 Minato-ku | 2,907 |  |
| 10 | [ABeam Consulting](https://www.tamtam.ai/c/abeam-consulting) (abeam.com)<br>Global consulting firm specializing in business strategy, digital technologies, operational services, and helping clients achieve competitive digital transformation and new business models. | Business Consulting and Services | 🇯🇵 Tokyo | 2,712 | 1981 |
| 11 | [株式会社パソナ (Pasona Inc.)](https://www.tamtam.ai/c/pasona-inc) (pasona.co.jp)<br>The company focuses on creating social infrastructure to provide job opportunities for individuals to pursue fulfilling careers and lifestyles | Staffing and Recruiting | 🇯🇵 Chiyoda | 2,442 | 1976 |
| 12 | [Baycurrent](https://www.tamtam.ai/c/baycurrent) (baycurrent.co.jp)<br>BayCurrent Consulting, Inc is a Japanese company with a focus on consulting services, with a diverse team of executives and outside directors | Business Consulting and Services | 🇯🇵 Minato | 2,086 |  |
| 13 | [KPMGジャパン／KPMG Japan](https://www.tamtam.ai/c/kpmg-kpmg-japan) (kpmg.com)<br>A group of 7 professional firms in Japan, covering auditing, tax, and advisory services Collaborates with KPMG's global network for comprehensive solutions | Business Consulting and Services | 🇯🇵 Chiyoda | 1,753 |  |
| 14 | [日本アイ・ビー・エム（株）](https://www.tamtam.ai/c/company-33375683) (ibm.com)<br>A retail company based in Tokyo, Japan, specializing in providing various products and services to customers in the local area | Retail | 🇯🇵 Chuo | 1,679 |  |
| 15 | [Future Focus Infotech Private Limited](https://www.tamtam.ai/c/future-focus-infotech-private-limited) (focusinfotech.com)<br>Providing strategic digital transformation and IT consulting services with global expertise, customer focus, and innovative, scalable technology solutions. | IT Services and IT Consulting | 🇯🇵 | 1,601 | 1997 |
| 16 | [en world Japan K.K.](https://www.tamtam.ai/c/en-world-japan-k-k) (enworld.com)<br>A leading partner for global talent in Japan and APAC, prioritizing honesty, trust, and customer success in recruitment services | Staffing and Recruiting | 🇯🇵 Chuo-ku | 1,402 | 1999 |
| 17 | [Eurotechnology Japan](https://www.tamtam.ai/c/eurotechnology-japan) (eurotechnology.com)<br>A leading technology consulting firm in Tokyo, specializing in telecommunications, software, semiconductor, environmental, and financial industries Acquiring, selling, and analyzing Japanese companies | Business Consulting and Services | 🇯🇵 Tokyo | 1,288 | 1997 |
| 18 | [TechnoPro Holdings, Inc.](https://www.tamtam.ai/c/technopro-holdings-inc) (technoproholdings.com)<br>Leading technology-focused staffing and services group with expertise in various technical fields, providing engineering staffing, subcontracting, consulting, and recruiting services to clients globally | Staffing and Recruiting | 🇯🇵 Minato-ku | 1,286 | 2012 |
| 19 | [Apex](https://www.tamtam.ai/c/apex-shibuya) (apexkk.com)<br>A Tokyo-based executive search firm specializing in recruiting bilingual professionals for mid to senior management positions in Japan | Staffing and Recruiting | 🇯🇵 Shibuya | 1,121 | 2010 |
| 20 | [RGF International Recruitment](https://www.tamtam.ai/c/rgf-international-recruitment) (rgf-hr.com)<br>A global human resource solutions company offering recruitment services for individuals and companies of all sizes across Asia | Staffing and Recruiting | 🇯🇵 Tokyo | 982 | 1998 |
| 21 | [Dentsu Digital](https://www.tamtam.ai/c/dentsu-digital) (dentsudigital.co.jp)<br>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 | IT Services and IT Consulting | 🇯🇵 Minato | 930 | 2016 |
| 22 | [EY Japan](https://www.tamtam.ai/c/ey-japan) (eyjapan.jp)<br>EY Japan consists of independent member firms collaborating to provide cutting-edge global services in assurance, advisory, tax, and transaction services | Accounting | 🇯🇵 | 920 |  |
| 23 | [Gengo](https://www.tamtam.ai/c/gengo) (gengo.com)<br>Global provider of crowdsourced human translation services across 35 languages, serving individuals and businesses worldwide with a network of 20,000+ pre-tested translators Headquarters in Tokyo | Translation and Localization | 🇯🇵 Shibuya-ku | 898 | 2008 |
| 24 | [Oriental Consultants Global](https://www.tamtam.ai/c/oriental-consultants-global) (ocglobal.jp)<br>A global consulting firm in Japan specializing in infrastructure development and project management for various sectors worldwide | Civil Engineering | 🇯🇵 Shinjuku-ku | 809 | 2014 |
| 25 | [デロイトトーマツコンサルティング（合同）](https://www.tamtam.ai/c/company-64341861) (deloitte.com)<br>A management consulting company based in Tokyo, Japan, specializing in providing strategic advice and solutions to businesses and organizations | Business Consulting and Services | 🇯🇵 Chiyoda | 802 | 1993 |
| 26 | [Kadence International](https://www.tamtam.ai/c/kadence-international) (kadence.com)<br>Global market research agency with a personalized approach, specializing in reaching diverse audiences and providing innovative solutions for elevated decision-making | Market Research | 🇯🇵 Tokyo | 761 | 1991 |
| 27 | [Nishimura & Asahi](https://www.tamtam.ai/c/nishimura-and-asahi) (nishimura.com)<br>A leading international law firm with over 800 professionals offering comprehensive legal services worldwide to promote growth and fairness | Law Practice | 🇯🇵 Tokyo | 742 | 1966 |
| 28 | [Pasona Group Inc. Global Network](https://www.tamtam.ai/c/pasona-group-inc-global-network) (pasona-global.com)<br>Global HR services provider specializing in talent acquisition, outsourcing, international business consulting, and training Strong international presence with 55 offices worldwide | Staffing and Recruiting | 🇯🇵 Minato-ku | 721 | 1976 |
| 29 | [MC Digital｜エムシーデジタル](https://www.tamtam.ai/c/mc-digital) (mcdigital.jp)<br>A technology company backed by Mitsubishi Corporation, specializing in digital transformation consulting, solutions, and AI SaaS to accelerate progress across industries | Strategic Management Services | 🇯🇵 Chiyoda | 649 | 2019 |
| 30 | [Vision Consulting, Inc.](https://www.tamtam.ai/c/vision-consulting-inc) (visioncon-global.com)<br>Innovative consulting firm from Japan focusing on breaking industry norms, improving business value, and creating new, impactful ventures globally | Business Consulting and Services | 🇯🇵 Minato | 646 | 2014 |
| 31 | [GoGlobal](https://www.tamtam.ai/c/goglobal) (goglobal.com)<br>International HR and Employer of Record service enabling global hiring, management, and payment of talent without local entity setup, ensuring compliance | Professional Services | 🇯🇵 Tokyo | 616 | 2018 |
| 32 | [Ernst & Young ShinNihon LLC（新日本有限責任監査法人）](https://www.tamtam.ai/c/ernst-and-young-shinnihon-llc) (eyjapan.jp)<br>A leading audit firm in Japan, member of EY, providing audit, assurance, and financial advisory services, prioritizing quality and global trust Visit wwwshinnihonorjp for more information | Accounting | 🇯🇵 | 543 |  |
| 33 | [BREXA Technology, Inc.](https://www.tamtam.ai/c/brexa-technology-inc) (technology.brexa.com)<br>Specializing in R&D, the company provides technical engineers for specific projects in machinery, electronics, software, and electrical fields, focusing on automotive, digital appliances, robotics, and medical devices | Temporary Help Services | 🇯🇵 Chiyoda | 539 | 2004 |
| 34 | [Randstad Japan](https://www.tamtam.ai/c/randstad-japan) (randstad.co.jp)<br>Specializing in HR services, we match client and candidate needs to exceed expectations and provide staffing, outsourcing, and professional solutions | Staffing and Recruiting | 🇯🇵 Chiyoda-ku | 531 | 1980 |
| 35 | [株式会社メンバーズ／Members Co.,Ltd](https://www.tamtam.ai/c/members-co-ltd) (members.co.jp)<br>Facilitating companies in advancing their decarbonization digital transformation through operational support in digital business Visit website for more information | Digital Accessibility Services | 🇯🇵 | 527 | 1995 |
| 36 | [ClassNK - Nippon Kaiji Kyokai](https://www.tamtam.ai/c/classnk-nippon-kaiji-kyokai) (classnk.com)<br>A ship classification society supporting safer, cleaner seas through technical services, certifications, and innovative solutions for digitalization and decarbonization challenges globally | Maritime Transportation | 🇯🇵 Chiyoda-ku | 526 | 1899 |
| 37 | [VisasQ inc.](https://www.tamtam.ai/c/visasq-inc) (corp.visasq.co.jp)<br>Connecting over 500,000 global experts across 190 countries, offering 1on1 interviews and expert surveys, promoting innovation with strict compliance standards. | IT Services and IT Consulting | 🇯🇵 Meguro-ku | 521 | 2012 |
| 38 | [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 |
| 39 | [Mitsubishi Research Institute](https://www.tamtam.ai/c/mitsubishi-research-institute) (mri.co.jp)<br>A prestigious think tank and consulting firm founded by Mitsubishi group, providing comprehensive solutions and IT services for sustainable business development | Think Tanks | 🇯🇵 Tokyo | 513 | 1970 |
| 40 | [TechnoPro, Inc.](https://www.tamtam.ai/c/technopro-inc) (technopro.com)<br>A leading technology staffing services company in Japan with a vast network of engineers providing technology solutions to various industries worldwide | IT Services and IT Consulting | 🇯🇵 Minato | 506 | 1997 |
| 41 | [Anderson Mori & Tomotsune](https://www.tamtam.ai/c/anderson-mori-and-tomotsune) (amt-law.com)<br>Leading full-service law firm in Japan, offering comprehensive legal advice on corporate transactions, M&A, finance, litigation, with bilingual lawyers and global reach | Law Practice | 🇯🇵 Chiyoda-ku | 500 | 1952 |
| 42 | [Borderlink, Inc.](https://www.tamtam.ai/c/borderlink-inc) (alt.borderlink.co.jp)<br>Specializing in preparing ALTs for positions beyond teaching in Japan, providing training and job placement services for foreign workers | Education Administration Programs | 🇯🇵 Saitama | 486 | 2000 |
| 43 | [AQ](https://www.tamtam.ai/c/aq) (aqworks.com)<br>A team of designers, developers, and researchers creating products to empower individuals in learning and accomplishing great things globally Founded in Tokyo, now based in Paris | Design Services | 🇯🇵 Tokyo | 475 | 2004 |
| 44 | [Fortience Consulting Inc.](https://www.tamtam.ai/c/fortience-consulting-inc) (fortience.com)<br>Consulting services for manufacturing, distribution, finance, public services, and government sectors with strategic, professional expertise and collaborative results. | Business Consulting and Services | 🇯🇵 Chiyoda | 461 | 2009 |
| 45 | [SIGMAXYZ Group（シグマクシス・グループ）](https://www.tamtam.ai/c/sigmaxyz-group) (sigmaxyz.com)<br>The company focuses on consulting services and investments to create value and solve social issues by utilizing its network strength | Business Consulting and Services | 🇯🇵 Minato-ku | 458 | 2008 |
| 46 | [FLUX](https://www.tamtam.ai/c/flux-minato) (flux.jp)<br>The company offers AI-powered solutions that boost clients' online sales and reduce expenses from technology utilization | Technology, Information and Internet | 🇯🇵 Minato | 450 | 2018 |
| 47 | [Oriental Consultants](https://www.tamtam.ai/c/oriental-consultants) (oriconsul.com)<br>A leading consultancy firm in Japan with 850 engineers and specialists, specializing in road engineering, airports, water systems, infrastructure development, IT, and environmental projects | Civil Engineering | 🇯🇵 Shibuya-ku | 430 |  |
| 48 | [PDFM](https://www.tamtam.ai/c/pdfm) (paejapan.com)<br>An American company founded in Japan in 1955, providing architectural, engineering, and facility maintenance services internationally, with a focus on infrastructure, interiors, and FM support | Architecture and Planning | 🇯🇵 Tokyo | 430 | 1955 |
| 49 | [株式会社クリーク･アンド･リバー社](https://www.tamtam.ai/c/company-minato) (cri.co.jp)<br>A professional agency specializing in various fields like TV, games, web, art, medical, IT, legal, fashion, and agriculture, providing job opportunities, projects, and copyright monetization | Staffing and Recruiting | 🇯🇵 Minato | 390 | 1990 |
| 50 | [Nagashima Ohno & Tsunematsu](https://www.tamtam.ai/c/nagashima-ohno-and-tsunematsu) (noandt.com)<br>A Tokyo-based organization providing international and commercial legal services, with an extensive overseas network and expertise in corporate transactions and risk management/governance cases | Law Practice | 🇯🇵 Chiyoda-ku | 389 | 2000 |

## 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 Japan

- [The largest companies in Japan](https://www.tamtam.ai/l/largest-companies-japan) (932)
- [Multinational companies in Japan](https://www.tamtam.ai/l/multinational-companies-japan) (470)
- [Companies with in-house R&D in Japan](https://www.tamtam.ai/l/r-and-d-companies-japan) (287)
- [Manufacturers in Japan](https://www.tamtam.ai/l/manufacturers-japan) (224)
- [Publicly traded companies in Japan](https://www.tamtam.ai/l/publicly-traded-companies-japan) (209)
- [Corporate groups and holding companies in Japan](https://www.tamtam.ai/l/holding-companies-japan) (181)
- [Hardware manufacturers in Japan](https://www.tamtam.ai/l/hardware-companies-japan) (142)
- [IT Services and IT Consulting companies in Japan](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-japan) (105)
- [Education providers in Japan](https://www.tamtam.ai/l/education-companies-japan) (75)
- [Companies with a mobile app in Japan](https://www.tamtam.ai/l/companies-with-mobile-app-japan) (69)
- [Electronics and semiconductor companies in Japan](https://www.tamtam.ai/l/electronics-companies-japan) (68)
- [IT services companies in Japan](https://www.tamtam.ai/l/it-services-companies-japan) (64)
- [AI companies in Japan](https://www.tamtam.ai/l/ai-companies-japan) (63)
- [Automotive manufacturers and suppliers in Japan](https://www.tamtam.ai/l/automotive-companies-japan) (60)
- [Critical infrastructure operators in Japan](https://www.tamtam.ai/l/critical-infrastructure-operators-japan) (59)
- [Higher Education companies in Japan](https://www.tamtam.ai/l/higher-education-companies-japan) (57)
- [Research institutes in Japan](https://www.tamtam.ai/l/research-institutes-japan) (55)
- [Consulting firms in Japan](https://www.tamtam.ai/l/consulting-firms-japan) (52)
- [Chemical companies in Japan](https://www.tamtam.ai/l/chemical-companies-japan) (51)
- [Financial services firms in Japan](https://www.tamtam.ai/l/financial-services-firms-japan) (50)
- [Public sector organisations in Japan](https://www.tamtam.ai/l/public-sector-organisations-japan) (48)
- [Energy companies in Japan](https://www.tamtam.ai/l/energy-companies-japan) (45)
- [Retail chains in Japan](https://www.tamtam.ai/l/retail-chains-japan) (45)
- [Appliances, Electrical, and Electronics Manufacturing companies in Japan](https://www.tamtam.ai/l/appliances-electrical-and-electronics-manufacturing-companies-japan) (40)

## The same list elsewhere

- [Professional services firms in the world](https://www.tamtam.ai/l/professional-services-firms-in-the-world) (24,737)
- [Professional services firms in Asia](https://www.tamtam.ai/l/professional-services-firms-in-asia) (1,619)

---

Source: https://www.tamtam.ai/l/professional-services-firms-japan