X0306 4 2019-06-30 0001005284 UNIVERSAL DISPLAY CORP \PA\ OLED 0001192994 HARTLEY C KEITH C/O UNIVERSAL DISPLAY CORPORATION 375 PHILLIPS BLVD. EWING NJ 08618 1 0 0 0 Common Stock 2019-06-30 4 A 0 518 0 A 81863 D Common Stock 22000 I By Plan Includes 800 shares transferred from Mr. Hartley's Defined Benefit Pension Plan to Mr. Hartley. Reflects transfer of 800 shares to Mr. Hartley. Mr. Hartley's Defined Benefit Pension Plan. /s/ C. Keith Hartley (by Sidney D. Rosenblatt as power of attorney) 2019-07-02