Owned by GVC Holdings PLC, Party Casino is part of a family that includes well-known brands like Sportingbet, Bwin, and Party Poker. Fire'. Fire'. Fire'. . Owned by GVC Holdings PLC, Party Casino is part of a family that includes well-known brands like Sportingbet, Bwin, and Party Poker. Owned by GVC Holdings PLC, Party Casino is part of a family that includes well-known brands like Sportingbet, Bwin, and Party Poker.