Japan: Nielsen expands Four-Screen Ad Deduplication across CTV
August 4, 2026
Nielsen, a specialist in audience measurement, data and media intelligence, has announced the expansion of its Four-Screen Ad Deduplication measurement in Japan to include all measurable connected TV inventory available through Nielsen ONE Ads.
The enhancement builds on Nielsen’s Four-Screen Ad Deduplication capability launched in Japan in June, which initially measured YouTube campaigns across computer, mobile and connected TV alongside linear TV.
With this latest update, measurement is no longer limited to YouTube CTV inventory. Media buyers and sellers can now understand deduplicated reach across computer, mobile, connected TV and linear TV for campaigns running across all other measurable Nielsen ONE Ads CTV inventory.
The expanded capability enables advertisers, agencies and media owners to compare the combined reach of campaigns across computer, mobile and CTV with linear television, providing a more complete view of how audiences are reached across platforms and publishers.
Matty Lin, Nielsen’s APAC Regional Sales Leader, commented: “Advertisers in Japan are increasingly planning campaigns across linear television, digital video and connected TV as part of one audience strategy. Expanding Four-Screen Ad Deduplication across measurable CTV inventory gives the industry a clearer view of total campaign reach, frequency and incremental audiences, without being limited to a single publisher. This is an important step towards true cross-media measurement through Nielsen ONE. By bringing more measurable inventory into a consistent and independent measurement framework, Nielsen is helping media buyers and sellers make better-informed decisions about where to invest, how to manage frequency and how effectively their campaigns are reaching audiences across screens.”
The expanded reporting includes metrics such as unique audience, audience reach, average frequency, and gross rating points. Co-viewing is also included in total impression delivery for clients assessing tracked-ad performance. Data will initially be delivered through offline reporting, with no forced campaign splits required as part of the update.
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