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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 Commission File Number 1-6903 Delaware ( State or Other Jurisdiction of Incorporation or Organization ) TRINITY INDUSTRIES , INC . ( Exact name of registrant as specified in its charter ) 14221 N. Dallas Parkway , Suite 1100 Dallas , Texas ( Address of principal executive offices ) Title of each class Common Stock 75-0225040 Trading Symbol ( s ) . " ( I.R.S. Employer Identification No. ) 75254-2957 ( Zip Code ) Registrant's telephone number , including area code : ( 214 ) 631-4420 Securities Registered Pursuant to Section 12 ( b ) of the Act Name of each exchange on which registered New York Stock Exchange TRN 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 þ 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 p 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¨ 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 p 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 . Large accelerated filer þ 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 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 Exchange Act ) . Yes No þ The aggregate market value of voting and non - voting common equity held by non - affiliates computed by reference to the price at which the common equity was last sold as of the last business day of the Registrant's most recently completed second fiscal quarter ( June 30 , 2020 ) was $ 1,934.5 million . At February 12 , 2021 , the number of shares of common stock , $ 0.01 par value , outstanding was 110,972,157 . The information required by Part III of this report , to the extent not set forth herein , is incorporated by reference from the Registrant's definitive 2021 Proxy Statement .