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☑ ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended March 31 , 2021 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 1-13905 COMPX INTERNATIONAL INC . ( Exact name of Registrant as specified in its charter ) Delaware ( State or other jurisdiction of Incorporation or organization ) 57-0981653 ( IRS Employer Identification No. ) 5430 LBJ Freeway , Suite 1700 , Three Lincoln Centre , Dallas , Texas ( Address of principal executive offices ) 75240-2620 ( Zip Code ) Registrant's telephone number , including area code ( 972 ) 448-1400 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Class A common stock Trading Symbol ( s ) CIX Name of each exchange on which registered NYSE American 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 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 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 , smaller reporting company , or an emerging growth company . See definitions of " large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , ” and “ emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer □ 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 . ☐ Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes □ No ☑ . As of April 29 , 2021 , the registrant had 12,401,157 shares of Class A common stock , $ .01 par value per share , outstanding .