More major advertisers have paused their spending on X, the social media service formerly known as Twitter, as the backlash continued over Elon Musk’s endorsement of an antisemitic conspiracy theory on X.

The entertainment company Warner Bros. and Sony have joined other prominent brands in halting their spending on X. IBM cut off its advertising on X on Thursday, while Apple, Lionsgate, the entertainment and film distribution company, and Paramount Global, the media giant that owns CBS, all paused their ads on Friday.

The spending freeze comes as X has fought to win back advertisers who were wary of spending on the platform after Mr. Musk took it over a year ago and said he would loosen content moderation rules. Major brands tend to be cautious about placing their ads next to posts with offensive or hateful speech.

Mr. Musk, who bought Twitter in October 2022 and renamed it X, drew scrutiny this week after replying to a post on X that accused Jewish people who are facing antisemitism amid the Israel-Hamas war of pushing the “exact kind of dialectical hatred against whites that they claim to want people to stop using against them” and supporting the immigration of “hordes of minorities.”