X0306 4 2020-03-05 0001005284 UNIVERSAL DISPLAY CORP \PA\ OLED 0001233730 SELIGSOHN SHERWIN I C/O UNIVERSAL DISPLAY CORPORATION 375 PHILLIPS BLVD. EWING NJ 08618 1 1 0 0 Chairman of Board and Founder Common Stock 2020-03-05 4 F 0 127 160.13 D 92388 D Common Stock 2020-03-06 4 F 0 128 155.85 D 92260 D Common Stock 2020-03-06 4 A 0 1400 0 A 93660 D Common Stock 2020-03-07 4 F 0 180 155.85 D 93480 D Common Stock 2020-03-07 4 A 0 1976 0.0 A 95456 D Common Stock 2020-03-07 4 F 0 541 155.85 D 94915 D Common Stock 21000 I By Trust Common Stock 136000 I By Corp. These shares were withheld to satisfy a tax liability in connection with the vesting on March 5, 2020 of 403 shares of restricted stock previously granted to Mr. Seligsohn. These shares were withheld to satisfy a tax liability in connection with the vesting on March 6, 2020 of 480 shares of restricted stock previously granted to Mr. Seligsohn. These units were granted to Mr. Seligsohn under the Company's Long Term Incentive Plan as part of his 2020 compensation and are subject to a time-based restriction, with one-third of the total unit amount vesting on each of March 6, 2021, 2022, and 2023. These shares were withheld to satisfy a tax liability in connection with the vesting on March 7, 2020 of 658 shares of restricted stock previously granted to Mr. Seligsohn. These shares were granted to Mr. Seligsohn as performance units under the Company's Long Term Incentive Plan as part of his 2017 compensation and vested on March 7, 2020 subject to the satisfaction of certain performance conditions, which our Compensation Committee certified on February 13, 2020 as having occurred. These shares were withheld to satisfy a tax liability in connection with the vesting on March 7, 2020 of 1,976 shares of restricted stock previously granted to Mr. Seligsohn. The Seligsohn Foundation, of which Mr. Seligsohn is the sole trustee. American Biomimetics Corporation, of which Mr. Seligsohn is a Director and Chairman, President and Secretary. /s/ Sherwin I. Seligsohn (by Mauro Premutico as power of attorney) 2020-03-09