# Top 29 marketing and communications agencies in Japan

Tamtam tracks 29 marketing and communications agencies headquartered in Japan. This list ranks all of them by number of employees on LinkedIn, led by dentsu, AnyMind Group and transcosmos inc.. Their median headcount is 450. Half of them were founded in 1997 or later. The most common headquarters are Tokyo (7).

These Japanese companies are primarily large and mid-sized firms in advertising, IT services, and digital marketing. dentsu, with nearly 20,000 employees, specializes in connecting brands with content and commerce. AnyMind Group, founded in 2016, offers an end-to-end commerce enablement platform. transcosmos inc., established in 1966, provides digital transformation and e-commerce solutions globally. Hakuhodo Inc., founded in 1895, is a global advertising and communication agency focusing on consumer insight and creativity. CyberAgent, Inc. is an internet company focusing on media, internet advertising, games, and investment development. Whatever Co. is an international creative agency formed in 2019.

A clear pattern is the concentration of headquarters in Tokyo, particularly within the Minato-ku, Shibuya, and Toshima-ku districts. This indicates a geographical clustering of these large marketing and IT services firms within the capital.

🇯🇵 Japan · 29 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |  |
| 2 | [AnyMind Group](https://www.tamtam.ai/c/anymind-group) (anymindgroup.com)<br>An end-to-end commerce enablement platform providing a wide range of tools for businesses, publishers, and influencers to drive next-generation commerce globally | Technology, Information and Internet | 🇯🇵 Tokyo | 9,204 | 2016 |
| 3 | [transcosmos inc.](https://www.tamtam.ai/c/transcosmos-inc) (trans-cosmos.co.jp)<br>It provides cost reduction and sales expansion services, focusing on digital transformation and e-commerce solutions across 32 countries globally. | IT Services and IT Consulting | 🇯🇵 Toshima-ku | 7,159 | 1966 |
| 4 | [dentsu Japan](https://www.tamtam.ai/c/dentsu-japan) (dentsu.co.jp)<br>A network of over 160 group companies in Japan offering services in advertising, business, customer experience, and digital transformations to support client growth | Advertising Services | 🇯🇵 Tokyo | 3,855 |  |
| 5 | [CyberAgent, Inc.](https://www.tamtam.ai/c/cyberagent-inc) (cyberagent.co.jp)<br>A pioneering internet company founded in 1998, focusing on media, internet advertising, games, and investment development to become the leading company of the 21st century | Technology, Information and Internet | 🇯🇵 Shibuya | 1,839 | 1998 |
| 6 | [Hakuhodo Inc.](https://www.tamtam.ai/c/hakuhodo-inc) (hakuhodo.co.jp)<br>Founded in 1895, a global advertising and communication agency with a focus on consumer insight and creativity, operating in 17 countries | Advertising Services | 🇯🇵 Minato-ku | 1,583 | 1895 |
| 7 | [ADK](https://www.tamtam.ai/c/adk) (adk.jp)<br>A leading advertising company in Japan transformed into a diversified group focusing on consumer activation, marketing solutions, creative services, and IP business | Advertising Services | 🇯🇵 Tokyo | 1,495 | 1956 |
| 8 | [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 |
| 9 | [Whatever Co.](https://www.tamtam.ai/c/whatever-co) (whatever.co)<br>An international creative agency formed in 2019 merging Japanese production company dot by dot, and creative agencies in New York, Taipei, and Berlin | Entertainment Providers | 🇯🇵 Minato-ku | 833 | 2019 |
| 10 | [CCC Ltd.](https://www.tamtam.ai/c/ccc-ltd) (ccc.co.jp)<br>A company specializing in entertainment content, multimedia distribution, and marketing consulting They aim to be a top idea company and cultural infrastructure builder | Advertising Services | 🇯🇵 Tokyo | 740 |  |
| 11 | [Nikkei Business Publications](https://www.tamtam.ai/c/nikkei-business-publications) (nikkeibp.co.jp)<br>A company based in Tokyo, Japan, focused on providing services or products related to the address mentioned in Minato-ku, Toranomon | Book and Periodical Publishing | 🇯🇵 Minato-ku | 588 |  |
| 12 | [株式会社ベクトル Vector Inc.](https://www.tamtam.ai/c/vector-inc) (vectorinc.co.jp)<br>A leading digital PR agency in Japan and Asia, offering services such as digital marketing, programmatic branding, video ads, talent casting, and media services | Advertising Services | 🇯🇵 Minato-ku | 553 | 1993 |
| 13 | [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 |
| 14 | [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 |
| 15 | [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 |
| 16 | [Adways Inc.](https://www.tamtam.ai/c/adways-inc) (adways.net)<br>A Tokyo Stock Exchange listed company offering affiliate services, ad distribution for smartphones, marketing platform UNICORN, and media content development worldwide | IT Services and IT Consulting | 🇯🇵 Shinjuku-ku | 397 | 2001 |
| 17 | [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 |
| 18 | [TBWA HAKUHODO](https://www.tamtam.ai/c/tbwa-hakuhodo) (tbwahakuhodo.co.jp)<br>A Tokyo-based advertising agency utilizing the DISRUPTION® methodology to create impactful solutions that challenge conventional thinking and drive change | Advertising Services | 🇯🇵 Tokyo | 339 |  |
| 19 | [KOCHI](https://www.tamtam.ai/c/kochi) (ko-chi.jp)<br>Bilingual experts in Tokyo specializing in SEO and digital marketing for the Japanese market Services include SEO, SEM, SNS ads, conversion rate optimization, and reporting | Advertising Services | 🇯🇵 Urayasu-shi | 255 | 2020 |
| 20 | [株式会社オプト](https://www.tamtam.ai/c/company-33424980) (opt.ne.jp)<br>Marketing operations and services |  | 🇯🇵 Chiyoda | 254 | 1982 |
| 21 | [IREP Co., Ltd.](https://www.tamtam.ai/c/irep-co-ltd) (irep.co.jp)<br>A leading digital marketing agency in Japan offering services such as SEO, SEM, web analytics, LPO, and mobile app marketing to improve client sales and ROI | Advertising Services | 🇯🇵 Shibuya | 216 | 1997 |
| 22 | [Zenken株式会社／Zenken Corporation](https://www.tamtam.ai/c/zenken-zenken-corporation) (zenken.co.jp)<br>A company based in Tokyo, Japan, located in Shinjuku Sentral Park Tower, offering services in a specific industry or field | IT Services and IT Consulting | 🇯🇵 Minato-ku | 195 | 1975 |
| 23 | [株式会社グッドパッチ](https://www.tamtam.ai/c/company-3245511) (goodpatch.com)<br>An independent design company collaborating with global partners to solve complex problems with a human-centered approach, offering UX/UI design, app development, and organizational design services | Design Services | 🇯🇵 Shibuya | 190 | 2011 |
| 24 | [Active Gaming Media](https://www.tamtam.ai/c/active-gaming-media) (activegamingmedia.com)<br>AGM specializes in publishing and supporting digital content for European, American, and Asian markets, with a focus on indie games, anime, and manga | Translation and Localization | 🇯🇵 Osaka | 186 | 2008 |
| 25 | [Mitsue-Links Co.,Ltd.](https://www.tamtam.ai/c/mitsue-links-co-ltd) (mitsue.co.jp)<br>Leading communication design company in Japan, specializing in digital content solutions for marketing, branding, website construction, system development, and analytics to drive sustainable development | IT Services and IT Consulting | 🇯🇵 Shinjuku | 185 | 1990 |
| 26 | [株式会社乃村工藝社 Nomura Co., Ltd.](https://www.tamtam.ai/c/nomura-co-ltd) (nomurakougei.co.jp)<br>An interior design and engineering services provider that has been creating spaces for people to gather since 1892 in Japan | Architecture and Planning | 🇯🇵 Minato | 181 | 1937 |
| 27 | [MATCHA](https://www.tamtam.ai/c/matcha-chuo) (company.matcha-jp.com)<br>An inbound media company showcasing the charms of Japan to the world, preserving valuable culture for future generations | IT Services and IT Consulting | 🇯🇵 Chuo | 43 | 2013 |
| 28 | [SUNNY SIDE UP Inc. (Please follow the new one!)](https://www.tamtam.ai/c/sunny-side-up-inc-please-follow-the-new-one) (linkedin.com)<br>PR agency with 30 years of experience managing top athletes and global brands in Japan, creating buzz and helping them succeed domestically and internationally | Public Relations and Communications Services | 🇯🇵 Tokyo | 17 | 1985 |
| 29 | [Rhizomatiks](https://www.tamtam.ai/c/rhizomatiks) (rhizomatiks.com)<br>A company that provides high-quality solutions and services with a focus on customer satisfaction and professionalism | Entertainment Providers | 🇯🇵 | 16 |  |

## 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)
- [Professional services firms in Japan](https://www.tamtam.ai/l/professional-services-firms-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)

## The same list elsewhere

- [Marketing and communications agencies in the world](https://www.tamtam.ai/l/marketing-agencies-in-the-world) (7,103)
- [Marketing and communications agencies in Asia](https://www.tamtam.ai/l/marketing-agencies-in-asia) (457)

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Source: https://www.tamtam.ai/l/marketing-agencies-japan