Magnite Sues Google, Alleging Monopololistic Behavior in Ad Exchanges — Update

By Nicholas G. Miller

Magnite filed a lawsuit against Google, alleging it has engaged in anticompetitive practices to force publishers and advertisers to use its ad server and ad exchange."

Magnite, an advertising platform that connects publishers with advertisers, said Google had engaged in an "exclusionary scheme to lock publishers into its ad server and to preference its own exchange."

It said that move prevented Magnite from competing fairly to grow its business. Magnite Chief Executive Michael Barrett said Google "favored its own business over the health of the open web, causing harm to publishers, advertisers and partners like us."

Google, a unit of Alphabet, did not immediately respond to a request for comment.

In an April decision of an antitrust lawsuit brought by the U.S. Justice Department, a U.S. District Court ruled Google violated antitrust law by monopolizing digital advertising markets. The court said Google implemented several actions to preserve its monopolies in the markets of publisher ad servers and ad exchanges.

Write to Nicholas G. Miller at nicholas.miller@wsj.com.

(END) Dow Jones Newswires

September 16, 2025 09:19 ET (13:19 GMT)