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( Mark One ) U 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 FORM 10 - K For the fiscal year ended December 31 , 2020 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Delaware ( State or other jurisdiction of incorporation or organization ) or 1329 Millwood Road McKinney , Texas ( Address of principal executive offices ) to Commission File Number : 000-20278 ENCORE WIRE CORPORATION ( Exact name of registrant as specified in its charter ) 75-2274963 ( I.R.S. Employer Identification No. ) 75069 ( Zip Code ) Registrant's telephone number , including area code : ( 972 ) 562-9473 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Trading Symbol ( s ) WIRE Name of each exchange on which registered The NASDAQ Global Select Market Common Stock , par value $ .01 per share Yes ý No 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 . Note Checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15 ( d ) of the Exchange Act from their obligations under those Sections . 7 Yes ý 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 . ý 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 ) . ý 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 .