Magnite (NASDAQ: MGNI), the world’s largest independent sell-side advertising platform, has been chosen to power the GroupM Premium Marketplace in the US and Canada, as well being named as a global preferred technology partner. GroupM will consolidate its programmatic media buying across omnichannel environments including CTV, digital video, and display within Magnite in the US and Canada. GroupM will leverage Magnite on a preferred basis globally across APAC, EMEA and LATAM.