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Top Advertising Companies in Japan

3 of 13 advertising companies ranked on evidence in the Q4 2026 edition.

Between them, the 13 advertising companies on this page cover eCommerce (3), advertising (3), consumer products & services (2) and advertising & marketing (2). 13 of them have written a profile you can read before you get in touch.

TrustList ranking

Q4 2026 edition

3 of 13 advertising companies ranked on evidence held on 12 October 2026: client reviews, vetting, awards and facts each business states on its own website, which we read and date. Nobody pays to be placed.

Positions are fixed for the quarter; the next edition is due in January 2027.

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Irep Inc
Consumer Products & Services · Advertising & Marketing · Hospitality & Leisure · Also in California
Irep Inc is a digital marketing agency with headquarters in Tokyo and a base in the San Francisco Bay Area.
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Why #1: Based in Tokyo, Japan, and the San Francisco Bay Area, USA · Founded 1997, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
Custom Media KK
Consumer Products & Services · Advertising & Marketing · Hospitality & Leisure
Custom Media KK is a bilingual B2B marketing agency that links Japan with overseas markets.
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Why #2: Based in Japan · In business 15+ years, as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
IPONWEB
eCommerce · Also in United Kingdom
IPONWEB builds the technology behind programmatic advertising.
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Why #3: Office in Japan · In business 10+ years · Team of 400+, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
Kemosabe
Advertising · Partners
Kemosabe is a full-service creative and media buying agency working from London, with particular experience in travel and tourism.
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On record: Founded 2016 · professional accreditation, as stated on its own website, read 5 Oct 2026
BIG SPLASH Creative
BIG SPLASH Creative is a film and media production studio in Tokyo.
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On record: Based in Tokyo, Japan
BLN24
Partners
Technology and experience firm doing data, AI, UX and communications work for US government agencies and large companies
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CyberZ
Advertising · Also in Reading
CyberZ is a Japanese advertising agency whose core business is smartphone marketing.
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On record: Based in Japan
Epiport Consulting LLC
Localization · Also in Tokyo and Asia
Epiport Consulting LLC works with overseas businesses that want customers in Japan and elsewhere in Asia-Pacific.
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F@N Communications
Advertising
F@N Communications, known in Japan as FAN Communications or FANCOMI, is an internet advertising group built around performance marketing.
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On record: Based in Japan
Ground
Ground is a creative agency in Tokyo that works in graphics, film and web.
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On record: Based in Tokyo, Japan
Headline
Headline is a venture capital investor that backs companies across several sectors and at any stage of growth.
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On record: Based in San Francisco, Paris, London, São Paulo, Taipei and Tokyo · Boutique
IGNITE Co., Ltd.
IGNITE Co., Ltd. is a digital marketing agency in Osaka, Japan.
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On record: Based in Osaka, Japan
Just Another Agency
Just Another Agency is an independent agency in Tokyo, Japan. It helps selected brands with public relations, marketing, localisation and original content.
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On record: Based in Tokyo, Japan · Independent agency

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Top Advertising Companies in Japan

Irep Inc

Custom Media KK

IPONWEB

Kemosabe

BIG SPLASH Creative

BLN24

CyberZ

Epiport Consulting LLC

F@N Communications

Ground

Headline

IGNITE Co., Ltd.

Just Another Agency

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