I heard this stat on Gameday Saturday regarding the number of players that were in the most recent portal:
Key figures for the 2024-2025 offseason:
FBS scholarship players: Over 3,400 entered the portal during the winter and spring windows.
All NCAA divisions: The total number of players from all NCAA divisions who entered the portal exceeded 11,000 for the 2023-24 cycle.
https://www.espn.com/college-football/story/_/id/45112485/college-football-transfer-portal-final-ranking-100-best
UNC allegedly picked up 50 players from the portal.