Fantilli, a forward, scored 36 points (18 goals, 18 assists) in 49 regular-season games for the Steel. The 16-year-old added nine points (eight goals, one assist) in eight playoff games to be named the 2021 Clark Cup Playoffs MVP for the USHL champions.
He played this past season with his brother, Luca Fantilli, who will play next season at the University of Michigan.
Adam Fantilli could have elected to join the Saginaw Spirit of the OHL next season. The Spirit selected him in the first round (No. 18 overall) of the 2020 OHL Priority Selection Draft.
Fantilli alongside forward Connor Bedard of the WHL's Regina Pats are considered the top prospects for the 2023 NHL Draft.
Fantilli will be the Steel's top returning scorer after losing their top six scorers to the NCAA. Prospects Sean Farrell and Matt Coronato leave for Harvard, Josh Doan heads to Arizona State, Erik Middendorf is off to Michigan State, Ryan Ufko leaves for UMass, and Matthew Samoskevich is off to Michigan.
Fantilli will try to lead the Steel to become the first USHL franchise to repeat as Clark Cup champions since the Omaha Lancers accomplished the feat in 1994.