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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Pennsylvania ( State or other jurisdiction of incorporation or organization ) 375 Phillips Boulevard , Ewing , New Jersey ( Address of principal executive offices ) UNIVERSAL DISPLAY CORPORATION ( Exact name of registrant as specified in its charter ) Title of each class Common Stock , $ 0.01 par value Large accelerated filer Non - accelerated filer to Commission File Number 1-12031 Registrant's telephone number , including area code : ( 609 ) 671-0980 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) OLED Securities registered pursuant to Section 12 ( g ) of the Act : None 23-2372688 ( I.R.S. Employer Identification No. ) No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No □ Accelerated filer Smaller reporting company 08618 ( Zip Code ) Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No Name of each exchange on which registered The NASDAQ Stock Market LLC Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . DOCUMENTS INCORPORATED BY REFERENCE Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . □ Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No The aggregate market value of the voting and non - voting common equity held by non - affiliates of the registrant computed by reference to the closing sale price of the registrant's common stock on the NASDAQ Global Market as of June 30 , 2020 , was $ 6,378,877,535 . Solely for purposes of this calculation , all executive officers and directors of the registrant and all beneficial owners of more than 10 % of the registrant's common stock ( and their affiliates ) were considered affiliates . As of February 16 , 2021 , the registrant had outstanding 47,109,309 shares of common stock . Portions of the registrant's Proxy Statement for the 2021 Annual Meeting of Shareholders , which is to be filed with the Securities and Exchange Commission no later than April 30 , 2021 , are incorporated by reference into Part III of this report .