Last year 7795 HS students applied to UPenn for ED and 1218 made it through for an acceptance rate of 15.6%. This year over 8000 applied so my best guess is around (1200/8050) got in or 14.9%. Typically UPenn shoots for a Freshman class size of 2400 and they want 50% filled with ED.
They will hopefully publish the actual ED admit number in 4 months when RD comes out.
To keep this community safe and supportive: