Quarterfinals for *America's Got Talent* Season 21 wrapped on September 8 with a combined live performance and results episode, where public votes and Sofia Vergara's final Live Golden Buzzer determined the semifinalists. Cesar Dias, Young & Strange, and Travis Garland advanced via viewer votes, joining nine prior qualifiers including Royal Lasers, Acro Canine Crew, and Daniel Alvarez, while Unitree earned direct entry to the finals. Heidi Klum guest-judged amid Simon Cowell's recovery. With semifinals set for September 15 and results the following night, traders should focus on performance momentum, genre diversity among acts, and historical voting patterns favoring strong vocals or spectacle in later rounds. The compressed schedule and real-time voting via app, website, and TikTok add volatility to any remaining resolution criteria.