Simpson Thacher Secures Complete Dismissal With Prejudice for Tyson Foods in Advertising Antitrust Suit
On March 26, 2026, Simpson Thacher secured the complete dismissal, with prejudice, of all claims asserted against Tyson Foods in a high‑profile antitrust suit in the Northern District of Texas. In the case, X Corp. alleged that Tyson and several other global advertisers participated in a conspiracy to boycott advertising on the X platform following changes to its content restrictions.
In its decision, the Court held that X failed to plead antitrust injury, noting “The only harm X has asserted is that its customers collectively chose X’s competitors over X.” The Court further explained that “If the conspiracy was meant to benefit competing social media companies, X has not alleged that Defendants’ activities allowed those competitors to corner the supply against consumer interests” and “If the conspiracy was meant to eliminate competition at the advertiser level, X has not alleged that Defendants’ boycott restrained X from selling to its downstream customers.”
The Simpson Thacher team was led by John Terzaken.