CECO: Company disclosure

Item 7.01 Regulation FD. The Company issued the news release attached hereto as Exhibit 99.1 in connection with the transfer of the primary listing of the Common Stock to TXSE. The information contained in Item 7.01 of this Current Report on Form 8-K (the “Report”) and in Exhibit 99.1 to the Report shall not be deemed “filed” with the Securities and Exchange Commission for purposes of Section 18 of the Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and is not incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act. Item 9.01. Financial Statements and Exhibits. (d) Exhibits Exhibit Number Exhibit Title 99.1 104 CECO Environmental Corp. Press Release, issued October 2, 2026. Cover Page Interactive Data File (embedded within the Inline XBRL document). Signatures Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: October 5, 2026 CECO Environmental Corp. By: /s/ Peter Johansson Peter Johansson Chief Financial Officer