17 Leading Digital Marketing Agencies in Japan and Tokyo

Originally published October 2024. Updated October 7, 2026.

Internet advertising crossed half of Japan's total ad spend for the first time in 2025, reaching 4,045.9 billion yen, according to Dentsu's March 2026 advertising expenditure report. That shift is why the 17 agencies below, from national holding-company networks to Tokyo-based specialists, compete on proving a campaign performs inside the digital majority, not only on running it. This guide covers all of Japan, including Tokyo.

Which agencies lead Japan's advertising holding-company tier?

Dentsu Inc., Hakuhodo Inc. and ADK (Asatsu-DK) run the three largest full-service networks in Japan, and Dentsu's own data is the industry benchmark: the company's March 2026 report is what the rest of the market cites when it discusses ad spend. Dentsu offers strategy, media planning and data analytics at national scale. Hakuhodo pairs the same scale with a stronger emphasis on social and content-led campaigns. ADK rounds out the tier with creative work spanning content production, media buying and data analysis, and a reputation for faster-moving creative than its larger rivals.

Which agency leads on internet-native advertising?

CyberAgent, Inc. runs the largest internet-native agency in Japan, built around its own ABEMA streaming platform alongside standard SEO and social advertising work. That combination lets CyberAgent buy and produce media inside one company rather than brokering it through a separate broadcaster, which is a structural advantage as Dentsu's data shows video and social formats driving most of Japan's digital ad growth. CyberAgent was founded in 1998 and also operates the Ameba platform.

Which Tokyo specialists and network arms complement the national firms?

Seven Tokyo-based firms cover performance advertising, programmatic buying, marketing technology, and global network work that the national firms handle less directly. They fall into three groups: listed digital-advertising specialists, independents, and the local arms of global networks.

Group	Agency	Specialty
Listed digital specialists	Septeni Holdings	Performance and internet advertising, with a growing data and AI marketing practice; listed on the Tokyo Stock Exchange (ticker 4293)
Listed digital specialists	Opt Inc.	Full-funnel digital advertising, CRM, and marketing technology consulting for large Japanese enterprises; founded 1993 and the core operating subsidiary of Digital Holdings, Inc. (TSE: 2389)
Listed digital specialists	FreakOut Holdings	Programmatic display, audience targeting, and analytics
Independents	Sempo	SEO, content marketing, and social, with a data-driven approach
Independents	Japan Digital Communications	Digital strategy, web development, and online advertising in one shop
Global network arms	Havas Tokyo	Digital strategy, content, and social, with Havas's international network
Global network arms	Ogilvy Japan	Brand strategy, digital advertising, content, and social, with Ogilvy's creative network

Everything-PR has not independently verified the current client rosters of these seven firms, so confirm them directly before using them in a brief.

Which boutique agencies specialize in SEO and social content?

Creev and Koozyt serve brands that need a smaller, more senior team than the holding-company networks provide. Creev focuses on SEO, content marketing and social media management built specifically around Japanese search and platform behavior. Koozyt runs creative campaigns and analytics work aimed at engagement and growth rather than national reach, making it a fit for a brand testing the market before committing to a larger retainer.

Which agencies serve global brands entering Japan?

GMO Internet, Inc., Publicis Japan, Tama Design and Toppan Printing Co., Ltd. cover the range a foreign brand is most likely to need. GMO offers SEO, SEM and social advertising from one of Japan's largest domestic internet-services companies. Publicis Japan, part of the global Publicis Groupe, delivers the integrated digital strategy and media planning a multinational client expects from its existing network relationship. Tama Design specializes in digital branding, website development and social media marketing for brands building a Japan-specific identity. Toppan Printing rounds out the group with data-driven marketing and digital-transformation work, drawing on the company's much larger footprint in print and packaging.

How does an agency choice change with Japan's digital majority?

Agency	Specialty	Best fit for
Dentsu Inc.	Full-service strategy, media, data	National-scale launches
Hakuhodo Inc.	Social and content-led integrated marketing	Brand campaigns needing cultural fluency
ADK	Creative content, media buying, data analysis	Faster-moving creative work
CyberAgent, Inc.	Internet-native advertising, SEO, ABEMA media	Digital-first and video-led campaigns
Septeni Holdings	Performance advertising, data and AI marketing	Measurable acquisition campaigns
Opt Inc.	Full-funnel advertising, CRM, marketing technology	Large enterprises modernizing marketing
FreakOut Holdings	Programmatic display and analytics	Audience-targeted display buying
Creev	SEO, content marketing, social management	Japan-specific organic growth
Koozyt	Creative campaigns, social strategy, analytics	Engagement-focused growth
Sempo	SEO, content marketing, social	Data-driven independent support
Japan Digital Communications	Digital strategy, web development, online advertising	Web and media in one agency
GMO Internet, Inc.	SEO, SEM, social advertising	Domestic internet-services scale
Publicis Japan	Integrated digital strategy, media planning	Multinational network clients
Havas Tokyo	Digital strategy, content, social	Multi-market campaigns with a Tokyo team
Ogilvy Japan	Brand strategy, digital advertising, content	Brand-building with a global creative network
Tama Design	Digital branding, web development	Building a Japan-specific brand identity
Toppan Printing Co., Ltd.	Data-driven marketing, digital transformation	Print-to-digital brand transitions

The question a brand using this table now has to add is not only who has the best book of business in Japan, but who shows up when a buyer asks ChatGPT, Claude or Gemini who to hire, the subject covered in Generative Engine Optimization.

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