X0407 4 2023-06-06 0 0001005284 UNIVERSAL DISPLAY CORP \PA\ OLED 0001232979 BROWN JULIA J C/O UNIVERSAL DISPLAY CORPORATION 250 PHILLIPS BLVD. EWING NJ 08618 0 1 0 0 EVP & Chief Technical Officer 0 Common Stock 2023-06-06 4 S 0 1764 150.14 D 63268 D Common Stock 2023-06-07 4 S 0 2601 150.53 D 60667 D Common Stock 2023-06-07 4 S 0 849 151.24 D 59818 D Includes 194 shares acquired under the Universal Display Corporation Employee Stock Purchase Plan on March 31, 2023. Represents the weighted average of a range of sale prices from $150.00 to $151.00. The Reporting Person undertakes to provide to the staff of the U.S. Securities and Exchange Commission, the Company or any shareholder of the Company, upon request, full information regarding the number of shares sold at each separate price. Represents the weighted average of a range of sale prices from $151.03 to $151.42. The Reporting Person undertakes to provide to the staff of the U.S. Securities and Exchange Commission, the Company or any shareholder of the Company, upon request, full information regarding the number of shares sold at each separate price. /s/ Julia J. Brown (by Mauro Premutico as power of attorney) 2023-06-08