New Zealand television’s streaming service, TVNZ+, gets 70% of its viewership on Connected TVs, where multiple people watch together. Since digital video measurement only counts logged-in profiles, TVNZ developed a co-viewing product to address the challenge. This presentation will detail the methodology they used for traditional TV audience measurement, how they adapted it for streaming, and how they pass the co-viewer data to the ad stack in real time. Hear what measurement challenges they are solving and how they let ad buyers optimise against co-viewer reach when traditional ad servers weren’t built for the purpose.