Bylaw Amendment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported):   September 6, 2023 _______________________________________ (Exact name of registrant as specified in its charter)       Delaware 1-6903 75-0225040 (State or other jurisdiction of incorporation) (Commission File No.) (I.R.S. Employer Identification No.) 14221 N. Dallas Parkway, Suite 1100, Dallas , Texas 75254-2957 (Address of Principal Executive Offices, and Zip Code) ( 214 ) 631-4420 Registrant's Telephone Number, Including Area Code Not Applicable (Former Name or Former Address, if Changed Since Last Report) ______________________________________________ Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐   Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐   Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐   Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock TRN New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). 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. ☐ Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year. On September 6, 2023, the Board of Directors (the “Board”) of Trinity Industries, Inc. (the “Company”) amended Section 1 of Article III of the Company’s Bylaws to reduce the number of directors constituting the Board from nine (9) to eight (8), effective immediately. This action eliminates a vacancy on the Board. No currently serving members of the Board are impacted. Item 9.01 Financial Statements and Exhibits. (a) - (c) Not applicable. (d) Exhibits: NO. DESCRIPTION 3.1 Amendment to the Company’s Bylaws reducing the number of directors constituting the Board from nine (9) to eight (8). 101.SCH Inline XBRL Taxonomy Extension Schema Document (filed electronically herewith). 101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document (filed electronically herewith). 101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document (filed electronically herewith). 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101). SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Trinity Industries, Inc. September 7, 2023 By: /s/ Eric R. Marchetto Name: Eric R. Marchetto Title: Executive Vice President and Chief Financial Officer