Yahoo Japan

Japan's dominant internet portal and digital advertising platform, commanding the largest share of Japan's search and display advertising market

Yahoo Japan, now operating as LY Corporation, was a major Japanese web portal that deeply integrated its services into the daily lives of Japanese users, functioning as far more than a search engine.¹ Its ecosystem spanned over 100 services — including a leading online news source, a top-three marketplace, and the dominant smartphone payment system PayPay — reaching 91% of smartphone users and 67.7% of PC users in Japan.¹ On the advertising side, LINE Yahoo! distinguished itself from other search ad networks by using first-party data, enabling precise audience targeting even in a cookie-less environment.¹ It offered advertisers audience segments unique to Japan — such as local sports fans, regional event followers, and izakaya diners — targeting capabilities that did not exist on Google or Meta, built from Yahoo Japan's proprietary content behavior data reflecting how Japanese users engaged with news, weather, shopping, and search.² In a notable ad tech partnership, retargeting specialist Criteo was given exclusive access to run personalized display advertising across Yahoo Japan's inventory, marking the first time a third-party entity had been granted access to its ad system.³ Japan's Fair Trade Commission concluded that from 2015 to 2022, Google had unfairly prevented Yahoo Japan from receiving targeted ad revenue generated by searches on mobile devices, finding that Google's actions had a significant effect of limiting competition.⁴ Source 1: digitalmarketingforasia.com — Unlocking Success: Google Vs Yahoo! JAPAN Ads Strategy Source 2: geezerbuild.com — Why Yahoo Ads still matter in Japan (yes this was written in ... Source 3: adexchanger.com — Criteo To Run Yahoo Japan's Performance-Based Inventory Source 4: theregister.com — Google gets a warning from Japan's FTC after blocking ...