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.