X0202 4 2005-04-28 0001005284 UNIVERSAL DISPLAY CORP \PA\ PANL 0001101463 LACERTE LAWRENCE 375 PHILLIPS BLVD. EWING NJ 08618 1 0 0 0 Common Stock 2005-04-28 4 P 0 600 8.48 A 841000 D Common Stock 2005-04-28 4 P 0 1300 8.49 A 842300 D Common Stock 2005-04-28 4 P 0 1000 8.40 A 843300 D Common Stock 2005-04-28 4 P 0 700 8.33 A 844000 D Common Stock 2005-04-28 4 P 0 1700 8.34 A 845700 D Common Stock 2005-04-28 4 P 0 2100 8.32 A 847800 D Common Stock 2005-04-28 4 P 0 1400 8.39 A 849200 D Common Stock 2005-04-28 4 P 0 800 8.4775 A 850000 D Common Stock 2005-04-29 4 P 0 300 8.02 A 850300 D Common Stock 2005-04-29 4 P 0 3000 8.03 A 853300 D Common Stock 2005-04-29 4 P 0 3400 8.04 A 856700 D Common Stock 2005-04-29 4 P 0 3300 8.05 A 860000 D Common Stock 2005-04-29 4 P 0 2000 8.08 A 862000 D Common Stock 2005-04-29 4 P 0 500 8.15 A 862500 D Common Stock 2005-04-29 4 P 0 2500 8.16 A 865000 D Steven V. Abramson (by power of attorney) 2005-05-02