AT&T brings ad unit Xandr under WarnerMedia ahead of HBO Max launch
https://www.reuters.com/article/us-at-t-warnermedia/att-brings-ad-unit-xandr-under-warnermedia-ahead-of-hbo-max-launch-idUSKBN22C2SI
AT&T Inc said on Thursday it will bring its advertising unit Xandr under its WarnerMedia label, which is set to launch its streaming channel HBO Max in May.