WASHINGTON, March 26 (Reuters) - A U.S. judge on

Thursday dismissed X Corp's antitrust lawsuit that accused the

World Federation of Advertisers and a group of major companies

including Mars, CVS Health ( CVS ) and Colgate-Palmolive ( CL )

of illegally boycotting billionaire entrepreneur Elon Musk's

social media company.

U.S. District Judge Jane Boyle in the federal court in Dallas

said Musk's X failed to show that it had suffered any harm under

federal antitrust laws.