Item 2.02. Results of Operations and Financial Condition. On January 16, 2025, CECO Environmental Corp. (the “ Company”) issued a press release announcing its preliminary financial results for the fourth quarter and full year ended December 31, 2024. A copy of the press release is furnished as Exhibit 99.1 to this report and is incorporated herein by reference. The information in this Item 2.02, including the exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits. (d) Exhibits Exhibit Exhibit Title 99.1 Press Release, CECO Environmental Announces Preliminary Fourth Quarter and Full Year 2024 Results and Highlights Key Strategic Transactions 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: January 17, 2025 CECO Environmental Corp. ────────────────────────────────────────────────────────────────────────────────────── By: /s/ Kiril Kovachev Kiril Kovachev Chief Accounting Officer