Was Chinese conglomerate Wanda Group among the surprise beneficiaries of the recent retail investor frenzy that caused a spike in the stock price of movie theater giantAMC Entertainment? A U.S.-based division of Wanda converted its Class B common stock in AMC to Class A shares on Monday, Feb. 1 "in order to permit sales of its common stock," AMC revealed in a filing with the Securities and Exchange Commission on Friday.