X0306 4 2021-03-02 0 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 2021-03-02 4 A 0 13089 0.00 A 90342 D Common Stock 2021-03-05 4 F 0 160 189.08 D 90182 D Common Stock 2021-03-06 4 F 0 190 189.08 D 89992 D Common Stock 2021-03-06 4 A 0 523 0.00 A 90515 D Common Stock 2021-03-06 4 F 0 150 189.08 D 90365 D Common Stock 2021-03-06 4 F 0 2024 189.08 D 88341 D Common Stock 2021-03-08 4 F 0 10605 199.81 D 77736 D These units were granted to Dr. Brown under the Company's Long Term Incentive Plan as part of her 2021 compensation and are subject to a time-based restriction, with one-third of the total unit amount vesting on each of March 2, 2022, 2023, and 2024. These shares were withheld to satisfy a tax liability in connection with the vesting on March 5, 2021 of 584 shares of restricted stock previously granted to Dr. Brown. These shares were withheld to satisfy a tax liability in connection with the vesting on March 6, 2021 of 696 shares of restricted stock previously granted to Dr. Brown. These shares were granted to Dr. Brown as performance units under the Company's Long Term Incentive Plan as part of her 2018 compensation and vested on March 6, 2021 subject to the satisfaction of certain performance conditions, which our Human Capital Committee certified on February 16, 2021 as having occurred. These shares were withheld to satisfy a tax liability in connection with the vesting on March 6, 2021 of 523 shares of restricted stock previously granted to Dr. Brown These shares were withheld to satisfy a tax liability in connection with the vesting on March 6, 2021 of 6,005 shares of restricted stock previously granted to Dr. Brown. These shares were withheld to satisfy a tax liability in connection with the vesting on March 8, 2021 of 25,000 shares of restricted stock previously granted to Dr. Brown. /s/ Julia J. Brown (by Mauro Premutico as power of attorney) 2021-03-09