OCI deadline is July 10. But they leave spots open for transfers. It's not a disadvantage if you deposit after that.
@ Wholigan: How would you rate Penn's transfer OCI? Also, how would you rate the hostility/friendliness towards transfers by both admin and students?
I experienced no hostility from anyone, and in general faculty and students are quite friendly. As far as number of interviews, transfers got as many as everyone else. I think I did 28 screeners or so, and the add/drop was very robust last year. At one point I had about 35 scheduled, but I dropped a few.
If you mean success rate, we had a 100% success rate last year among transfers participating in OCI. The year before it was around 90%. Most are in NY, although some transfers placed in DC and secondary markets.