X0306 4 2021-03-02 0 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 2021-03-02 4 A 0 1017 0.00 A 92069 D Common Stock 2021-03-05 4 F 0 108 189.08 D 91961 D Common Stock 2021-03-06 4 F 0 131 189.08 D 91830 D Common Stock 2021-03-06 4 A 0 360 0.00 A 92190 D Common Stock 2021-03-06 4 F 0 113 189.08 D 92077 D Common Stock 2021-03-06 4 F 0 128 189.08 D 91949 D Common Stock 21000 I By Trust Common Stock 136000 I By Corp. These units were granted to Mr. Seligsohn under the Company's Long Term Incentive Plan as part of his 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 402 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, 2021 of 480 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 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 360 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, 2021 of 467 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) 2021-03-09