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Table of Contents ( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 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 Commission File Number : 001-38905 Delaware ( State or other jurisdiction of incorporation or organization ) 9000 Virginia Manor Road , Suite 200 Beltsville , Maryland ( Address of principal executive offices ) FORM 10 - K NextCure , Inc. ( Exact name of registrant as specified in its charter ) Title of each class Common Stock , $ 0.001 par value per share Securities registered pursuant to Section 12 ( b ) of the Act : to Large accelerated filer Non - accelerated filer > Registrant's telephone number , including area code : ( 240 ) 399-4900 Trading Symbol ( s ) NXTC 04-5231247 ( I.R.S. Employer Identification No. ) 20705 ( Zip Code ) Name of each exchange on which registered : Nasdaq Global Select Market Securities registered pursuant to Section 12 ( g ) of the Act : None . Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes No X 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 X 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 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 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 . Accelerated filer Smaller reporting company 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 ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Yes No 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 registrant's common stock held by non - affiliates as of June 30 , 2020 the last business day of the registrant's most recently completed second fiscal quarter , was approximately $ 590.0 million , as computed by reference to the closing price of the common stock on the Nasdaq Global Select Market on that date . As of March 3 , 2021 , the registrant had 27,599,949 shares of common stock , par value $ 0.001 per share , issued and outstanding . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's definitive Proxy Statement for its 2021 Annual Meeting of Stockholders , which will be filed with the Commission within 120 days after December 31 , 2020 , are incorporated by reference into Part III of this Report .