Shares of AMC Entertainment (NYSE:AMC) stock are in the spotlight following a Schedule 13G update from Vanguard.As of the end of the first quarter, Vanguard owned 24.80 million shares of AMC stock. The investment services company revealed in a filing that it now owns 30.51 million shares as of June 28, meaning that it increased its position by 5.71 million shares or by 23%. Its position is equivalent to a 10.32% ownership stake.There is a caveat here, however. Vanguard is one of the world’s largest exchange ...