X0306 4 2020-04-07 0001005284 UNIVERSAL DISPLAY CORP \PA\ OLED 0001232979 BROWN JULIA J C/O UNIVERSAL DISPLAY CORPORATION 375 PHILLIPS BLVD. EWING NJ 08618 0 1 0 0 Chief Technical Officer Common Stock 2020-04-07 4 A 0 2864 0 A 100085 D Common Stock 2020-04-07 4 F 0 1214 134.75 D 98871 D These shares were granted to Dr. Brown as performance units under the Company's Long Term Incentive Plan as part of her 2017 compensation and vested subject to the satisfaction of certain performance conditions, which our Compensation Committee certified on April 7, 2020 as having occurred. Includes 110 shares acquired under the Universal Display Corporation Employee Stock Purchase Plan on March 31, 2020. These shares were withheld to satisfy a tax liability in connection with the vesting on April 7, 2020 of 2,864 shares of restricted stock previously granted to Dr. Brown. /s/ Julia J. Brown (by Mauro Premutico as power of attorney) 2020-04-09