D.C. United, owned by the consortium D.C. United Holdings, is an American professional soccer club located in Washington, D.C. Considered the most successful club in Major League Soccer, D.C. United has won the U.S. Open Cup twice and holds the record for most MLS Cups and MLS Supporters' Shields with four apiece. D.C. United was the first club to win both the MLS Supporters' Shield and the MLS Cup back-to-back.