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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ( 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 TO Commission File Number 001-33520 Form 10 - K Delaware ( State or Other Jurisdiction of Incorporation or Organization ) COMSCORE , INC . ( Exact Name of Registrant as Specified in its Charter ) Title of Each Class Common Stock , par value $ 0.001 per share 11950 Democracy Drive , Suite 600 Reston , Virginia 20190 ( Address of Principal Executive Offices ) Large accelerated filer Non - accelerated filer 54-1955550 ( I.R.S. Employer Identification Number ) ( 703 ) 438-2000 ( Registrant's Telephone Number , Including Area Code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol Name of Each Exchange on Which Registered NASDAQ Global Select Market SCOR 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 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 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 . ✓ Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No The aggregate market value of the registrant's voting and non - voting common equity held by non - affiliates of the registrant , as of June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , was approximately $ 157.1 million ( based on the closing price of the registrant's common stock on the Nasdaq Global Select Market on that date ) . Solely for purposes of this disclosure , shares of the registrant's common stock held by executive officers and directors and each person who owned 10 % or more of the outstanding common stock of the registrant have been excluded in that such persons may be deemed to be affiliates . This determination of affiliate status is not a conclusive determination for other purposes . Indicate the number of shares outstanding of each of the registrant's classes of common stock , as of the latest practicable date : As of March 5 , 2021 , there were 75,787,242 shares of the registrant's common stock outstanding . DOCUMENTS INCORPORATED BY REFERENCE Specified portions of the registrant's Proxy Statement with respect to its 2021 Annual Meeting of Stockholders , to be filed with the Securities and Exchange Commission no later than 120 days following the end of the registrant's fiscal year ended December 31 , 2020 , are incorporated by reference in Part III of this Annual Report on Form 10 - K .