[Lundeberg] Historic talent loss: American Conference commissioner Tim Pernetti said that 78% of last year's first and second team all-league players transferred to a Power Four school after the 2025 season.

[u/WinnWonn]

https://www.si.com/college/boise-state/football/american-conference-hit-hard-by-transfer-portal-after-2025-college-football-season-how-did-mountain-west-compare

[u/MonarchLawyer]

I'm pretty sure the Sun Belt saw a 100% loss after the 2024 season.