Update: Gantt Reports the Panthers added three more players for a total of 13:
The Panthers added RB Daniel Porter (Louisiana Tech), G Noah Franklin (Oklahoma State) and LB Sean Ware (New Hampshire).
WR Oliver Young (South Carolina State), FB Rashawn Jackson (Virginia) OL Ray Hisatake (Hawaii), Kurtis Gregory (Missouri) and Mark Ortmann (Michigan), DT Andre Neblett (Temple), S Matt O’Hanlon (Nebraska) and P Blake Hauden (Minnesota).
I've found some additional info some of the these guys plus another not mentioned by Gantt:
Update from Gantt:
(Update: 8:16 a.m. The Panthers have also agreed to deals with K Aaron Pettrey (Ohio State) and TE Andrew George (BYU).
Interesting the Panthers brought in a FG kicker. Pettrey was one of the top kickers in a shallow kicker group. Does anyone know anything about these guys