AMC Entertainment (NYSE:AMC) stock couldn’t hold on to all of its gains after the recent meme stock rally. After soaring 32% in one day following the social media return of Roaring Kitty, it gave back more than one-third of them and has essentially held that position since.Many believe AMC stock will still take the next leg lower eventually, but private equity has been buying up shares and establishing significant positions in the movie theater operator.It amounts to a big vote of confidence for AMC Enterta ...