X0306 4 2020-10-12 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 2020-10-12 4 S 0 4156.0 198.76 D 94733.0 D Common Stock 2020-10-12 4 S 0 14461.0 199.64 D 80272.0 D Common Stock 2020-10-12 4 S 0 2335.0 200.59 D 77937.0 D Common Stock 2020-10-12 4 S 0 459 201.93 D 77478 D Common Stock 2020-10-12 4 S 0 158 202.36 D 77320 D Common Stock 2020-10-12 4 S 0 67 203.71 D 77253 D These shares were sold pursuant to a Rule 10b5-1 Non-Discretionary Trading Plan previously entered into by Dr. Brown. Represents the weighted average of a range of sale prices from $198.16 to $199.13. The reporting person undertakes to provide to the Staff of 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. Includes 18 shares acquired under the Universal Display Corporation Employee Stock Purchase Plan on June 30, 2020. Represents the weighted average of a range of sale prices from $199.16 to $200.16. The reporting person undertakes to provide to the Staff of 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 $200.17 to $201.04. The reporting person undertakes to provide to the Staff of 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 $201.23 to $202.19. The reporting person undertakes to provide to the Staff of 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 $202.26 to $202.60. The reporting person undertakes to provide to the Staff of 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 $203.51 to $203.72. The reporting person undertakes to provide to the Staff of 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) 2020-10-14