Supreme Court Turns Down Comcast’s Advertising Antitrust Appeal

The U.S. Supreme Court declined Monday to shut down claims that Comcast Corp. violated antitrust laws by refusing to do business with Viamedia Inc., a rival in the TV ad placement market.

The justices said they won’t review a ruling by the U.S. Court of Appeals for the Seventh Circuit reviving Viamedia’s allegations under the “duty to deal” doctrine, which imposes liability for ending a profitable commercial relationship solely to harm a rival.

The high court adopted the position advanced by the Biden administration, which had urged it not to get involved in the case. The justices sought the government’s ...