AST SpaceMobile is trading 4.95% up at $62.34 during the September 30 session, fueled by multiple catalysts. - AT&T CEO John Stankey challenged SpaceX's rooftop cellular strategy on Tuesday, citing cost and property-owner permission hurdles, which could support AST SpaceMobile’s carrier-partner approach. - The company's board also adopted a new change-of-control severance plan on September 29, fueling retail trader speculation of a potential buyout.