Dee looks to find a new home after one season in Happy Valley.
Mitchell became the third Nittany Lion to hit the portal this spring.
Robinson played in 14 games in 2024 making 11 tackles.
Reed clocked a 4.49 40-yard dash and a 33.5-inch vertical at the 2025 NFL Combine.
As the spring transfer portal opens, only JB Nelson has announced his intent to leave the program.
Nelson was removed from the roster on Friday.