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Table of Contents 0 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31 , 2020 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - K Commission File Number 0-21719 Steel Dynamics , Inc. ( Exact name of registrant as specified in its charter ) Indiana ( State or other jurisdiction of incorporation or organization ) 7575 West Jefferson Blvd , Fort Wayne , IN ( Address of principal executive offices ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock voting , $ 0.0025 par value Large accelerated filer Non - accelerated filer Registrant's telephone number , including area code : ( 260 ) 969-3500 Trading Symbol STLD 35-1929476 ( IRS Employer Identification No. ) 46804 ( Zip Code ) 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 Accelerated file Smaller reporting company Name of each exchange on which registered NASDAQ Global Select Market 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 . 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 voting stock held by non - affiliates of the registrant computed by reference to the price at which the common equity was last sold as of June 30 , 2020 , was approximately $ 4.1 billion . Registrant has no non - voting shares . For purposes of this calculation , shares of common stock held by directors , officers and 5 % stockholders known to the registrant have been deemed to be owned by affiliates , but this should not be construed as an admission that any such person possesses the power , direct or indirect , to direct or cause the direction of the management or policies of the registrant or that such person is controlled by or under common control with the registrant . As of February 19 , 2021 , Registrant had outstanding 211,005,100 shares of common stock . DOCUMENTS INCORPORATED BY REFERENCE Portions of registrant's definitive proxy statement referenced in Part III , Items 10 through 14 of this report , to be filed prior to April 30 , 2021 , are incorporated herein by reference .