X0407 4 2023-03-31 0 0001005284 UNIVERSAL DISPLAY CORP \PA\ OLED 0001232978 ROSENBLATT SIDNEY D C/O UNIVERSAL DISPLAY CORPORATION 250 PHILLIPS BLVD. EWING NJ 08618 1 0 0 0 0 Common Stock 2023-03-31 4 A 0 472 0.00 A 119839 D Common Stock 2023-03-31 4 F 0 200 155.13 D 119639 D Common Stock 41451 I By Grantor Retained Annuity Trust Common Stock 13000 I By Spouse These shares were withheld to satisfy a tax liability in connection with the vesting on March 31, 2023 of 472 shares of restricted stock granted to the Reporting Person for his service as a director. These shares are held by the Reporting Person's spouse and are being reported as beneficially owned by him. /s/ Sidney D. Rosenblatt (by Mauro Premutico as power of attorney) 2023-04-04