Over the last five years, the company that operates the World Poker Tour, bwin.party Digital Entertainment, has seen its stock price cut in half. Meanwhile, the London Stock Exchange, where the company has listed, has climbed by more than half. Not a good look. That makes this $1.6 billion market cap U.K company — which also has businesses ranging from casino games, to sports, betting, to poker — a very attractive target for hedge funds that happen to play the very-American activist investing game.