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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 to Commission File Number : 0-19034 REGENERON PHARMACEUTICALS , INC . ( Exact name of registrant as specified in its charter ) New York ( State or other jurisdiction of incorporation or organization ) ( I.R.S. Employer Identification No. ) 777 Old Saw Mill River Road Tarrytown , New York 10591-6707 ( Address of principal executive offices , including zip code ) 13-3444607 ( 914 ) 847-7000 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol REGN Title of each class Common Stock - par value $ .001 per share Accelerated filer 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 . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . 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 . 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 Yes Large accelerated filer Non - 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 . Yes > Yes > 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 . The number of shares outstanding of each of the registrant's classes of common stock as of January 29 , 2021 : Class of Common Stock Class A Stock , $ .001 par value Common Stock , $ .001 par value No No 风 Number of Shares 1,848,970 105,282,929 No 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 > NO The aggregate market value of the voting and non - voting common stock held by non - affiliates of the registrant was approximately $ 63,344,000,000 , computed by reference to the closing sales price of the stock on NASDAQ on June 30 , 2020 , the last trading day of the registrant's most recently completed second fiscal quarter . For purposes of this calculation only , the registrant has assumed that all of its directors and executive officers , and no other persons , are its affiliates . This determination of affiliate status is not necessarily a determination for other purposes . DOCUMENTS INCORPORATED BY REFERENCE Specified portions of the Registrant's definitive proxy statement to be filed in connection with solicitation of proxies for its 2021 Annual Meeting of Shareholders are incorporated by reference into Part III of this Form 10 - K . Exhibit index is located on pages 92 to 97 of this filing .