X0306 4 2021-04-06 0 0001005284 UNIVERSAL DISPLAY CORP \PA\ OLED 0001232978 ROSENBLATT SIDNEY D C/O UNIVERSAL DISPLAY CORPORATION 375 PHILLIPS BLVD. EWING NJ 08618 1 1 0 0 EVP and CFO Common Stock 2021-04-06 4 A 0 1487 0.00 A 153833 D Common Stock 2021-04-06 4 F 0 630 242.10 D 153203 D Common Stock 92275 I By Grantor Retained Annuity Trust Common Stock 13000 I By Spouse These shares were granted to Mr. Rosenblatt as performance units under the Company's Long Term Incentive Plan as part of his 2018 compensation and vested subject to the satisfaction of certain performance conditions, which our Human Capital Committee certified on April 6, 2021 as having occurred. Includes 10 shares acquired under the Universal Display Corporation Employee Stock Purchase Plan on March 31, 2021. These shares were withheld to satisfy a tax liability in connection with the vesting on April 6, 2021 of 1,487 shares of restricted stock previously granted to Mr. Rosenblatt. /s/ Sidney. D. Rosenblatt (by Mauro Premutico as power of attorney) 2021-04-08