Executive Change

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): June 4, 2025 CECO ENVIRONMENTAL CORP. (Exact Name of registrant as specified in its charter) Delaware 000-7099 13-2566064 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 5080 Spectrum Drive Suite 800E Addison , Texas 75001 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code: ( 214 ) 357-6181 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 Name of each exchange on which registered Common Stock, par value $0.01 per share CECO The NASDAQ Stock Market LLC Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter). 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 . ☐         5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On June 4, 2025, Todd R. Gleason, the Chief Executive Officer of CECO Environmental Corp. (the "Company"), received an equity grant of 150,000 performance-based restricted stock units (“PSUs”) under the Company’s 2021 Equity and Incentive Compensation Plan. The PSUs will vest four years from the grant date only if (i) Mr. Gleason is still employed by the Company at the vest date, and (ii) the Company’s stock price reaches at least $40.00 (with additional payouts up to a maximum of 200% if the Company's stock price reaches additional stock price targets as outlined in the Equity Award Agreement, as defined herein) for 20 or more consecutive trading days during the four-year performance period. The terms of the PSU award are documented within an equity award agreement between the Company and Mr. Gleason, dated June 4, 2025 (the “Equity Award Agreement”).   The foregoing description of the Equity Award Agreement is a summary only and is qualified in its entirety by reference to the full text of the Equity Award Agreement, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference. 9.01. Financial Statements and Exhibits. (d) Exhibits. Exhibit No. Description     10.1 Equity award agreement between the Company and Todd R. Gleason, dated June 4, 2025. 104 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: June 6, 2025   CECO Environmental Corp.             By: /s/ Joycelynn Watkins-Asiyanbi       Joycelynn Watkins-Asiyanbi       SVP, Chief Administrative and Legal Officer and Corporate Secretary