With the Season 21 finalists locked in after the September 16 semifinals results, trader sentiment for the runner-up reflects a wide-open field of 10 diverse acts heading into the September 22–23 finale. Golden Buzzer recipients Nene Royal, Hundred Fingers, Unitree, and Lai Noelle entered with established momentum from quarterfinal performances, while voter-advancers including ACRO Crew, Come Here, Royal Lasers, Olivia Befus, Veronika Goroshkova, and Geno Ploeger round out the competitive slate. The near-even implied probabilities across most contenders stem from AGT’s history of unpredictable public voting, where finals-night delivery, emotional backstories, and viral moments often override early frontrunner status. Key swing factors include the two-night performance order, audience reaction metrics, and any late judge commentary before votes close.