X0407 4 2023-03-22 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 2023-03-22 4 A 0 3209 0.00 A 120728 D Common Stock 2023-03-22 4 F 0 1361 144.89 D 119367 D Common Stock 13000 I By Spouse Common Stock 41451 I By Grantor Retained Annuity Trust These shares were granted to the Reporting Person as performance units under the Company's Long Term Incentive Plan as part of 2020 compensation and vested subject to the satisfaction of certain performance conditions, which our Human Capital Committee certified on March 22, 2023 as having occurred. These shares were withheld to satisfy a tax liability in connection with the vesting on March 22, 2023 of 3,209 shares of restricted stock previously granted to the Reporting Person. 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) 2023-03-24