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Table of Contents ☐ 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 Commission File No. 001-12561 Delaware ( State or other jurisdiction of incorporation or organization ) Title of each class Common Stock , $ 0.01 par value Large accelerated filer Non - accelerated filer Emerging growth company BELDEN INC . ( Exact name of registrant as specified in its charter ) to 1 North Brentwood Boulevard 15th Floor St. Louis , Missouri 63105 ( Address of Principal Executive Offices and Zip Code ) ( 314 ) 854-8000 ( Registrant's Telephone Number , Including Area Code ) share 36-3601505 ( IRS Employer Identification No. ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol BDC per 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 . Yes o No p . Yes o No þ . 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 þ No o . Accelerated filer Smaller reporting company 0 Name of each exchange on which registered The New York Stock Exchange Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate website , if any , every interactive data file required to be submitted and posted pursuant to Rule 405 of Regulation S - T ( section 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit and post such files ) . Yes þ No o . 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 . 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 .