CECO Environmental Corp. filed SEC Form 8-K: Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation, Financial Statements and Exhibits

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): March 30, 2026

CECO ENVIRONMENTAL CORP.

(Exact Name of registrant as specified in its charter)

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:

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. ☐

Item 1.01 Entry into a Definitive Material Agreement.

On March 30, 2026 (the “Effective Date”), CECO Environmental Corp. (the “Company”) entered into that certain Amendment No. 1 to Fourth Amended and Restated Credit Agreement (the “Amendment”), among the Company, its subsidiaries party thereto, the Lenders (as defined below) party thereto, and Bank of America, N.A., as administrative agent (the “Agent”), which amends the Company’s Fourth Amended and Restated Credit Agreement (the “Existing Credit Agreement”; the Existing Credit Agreement as amended by the Amendment, the “Credit Agreement”), among the Company, its subsidiaries from time to time party thereto, the lenders from time to time party thereto (the “Lenders”), and the Agent.

The Amendment amends the Existing Credit Agreement to, among other things, (i) increase the aggregate principal amount of the senior secured revolving credit facility commitments under the Credit Agreement to $740 million (the “Revolving Facility”); (ii) add an incremental senior secured delayed-draw term loan commitment in an initial aggregate principal amount of $235 million (the “Incremental Term A-1 Loan Facility”; together with the Revolving Facility, the “Credit Facility”), subject only to the satisfaction or waiver of the related conditions precedent set forth in the Credit Agreement, including, without limitation, the consummation of the merger and acquisition contemplated by that certain Agreement and Plan of Merger, dated as of February 23, 2026, by and among the Company, Longhorn Merger Sub, Inc., Longhorn Merger Sub LLC, and Thermon Group Holdings, Inc. originally disclosed, and as further described, in the Company’s Current Report on Form 8-K filed February 24, 2026, as from time to time in effect (such merger and acquisition, the “Longhorn Acquisition”); (iii) amend the aggregate principal amount by which the Company may elect from time to time to increase the Credit Facility, in the form of additional revolving credit and/or one or more tranches of term loans (and inclusive of the Incremental Term A-1 Loan Facility), or incur certain incremental equivalent indebtedness, to up to (a) (1) the greater of (A) $230 million (or, prior to the date of the funding of the Longhorn Acquisition under the Credit Agreement (the “Longhorn Acquisition Funding Date”), $80 million) and (B) an amount equal to 100% of consolidated EBITDA, calculated on a pro forma basis, for the most recently ended period of four consecutive fiscal quarters of the Company available prior to the incurrence of such additional debt, plus (2) the sum of certain prepayments of indebtedness, minus (3) the aggregate principal amount of any such prior increases or incremental equivalent indebtedness, plus (b) such additional amount, if any, as would not cause the Company’s Consolidated Secured Net Leverage Ratio (as defined in the Credit Agreement) to exceed 3.50 to 1.00 after giving pro forma effect to such increased amount, subject to certain conditions, including the consent of the Agent and any increasing or additional lenders, all as further detailed in the Credit Agreement; (iv) add a maturity date extension option to be exercised at the Company’s election, subject to certain conditions including, without limitation, the consent of the extending Lenders, as further detailed in the Credit Agreement; (v) replace the minimum Consolidated Fixed Charge Coverage Ratio (as defined in the Credit Agreement) of 1.25 to 1.00 required to be maintained under the Credit Agreement (which will apply only until the occurrence of the Longhorn Acquisition Funding Date) with a minimum Consolidated Interest Coverage Ratio (as defined in the Credit Agreement) of 3.00 to 1.00, as applicable; (vi) increase the Company’s maximum Consolidated Net Leverage Ratio required to be maintained under the Credit Agreement from 4.00 to 1.00 (which will apply only until the occurrence of the Longhorn Acquisition Funding Date) to (a) 4.50 to 1.00 from the Longhorn Acquisition Funding Date through the third full fiscal quarter ending thereafter, (b) 4.25 to 1.00 for the succeeding two full fiscal quarters, and (c) 4.00 to 1.00 thereafter; (vii) increase the Company’s maximum Consolidated Secured Net Leverage Ratio required to be maintained under the Credit Agreement from 3.50 to 1.00 (which will apply only until the occurrence of the Longhorn Acquisition Funding Date) to (a) 4.25 to 1.00 from the Longhorn Acquisition Funding Date through the third full fiscal quarter ending thereafter, (b) 4.00 to 1.00 for the succeeding two full fiscal quarters, and (c) 3.50 to 1.00 thereafter; and (viii) increase the size of, or add additional flexibility for the Company in respect of, various of the other covenants in the Credit Agreement, as further detailed in the Credit Agreement.

The Incremental Term A-1 Loan Facility will amortize quarterly, beginning with the first calendar quarter following the Longhorn Acquisition Funding Date, in an amount equal to (i) 1.25% of the outstanding principal amount of all Incremental Term A-1 Loans (as defined in the Credit Agreement) for the first eight quarterly installments and (ii) 1.875% of the outstanding principal amount of all Incremental Term A-1 Loans for each quarterly installment thereafter.

Subject to the Extension Option, the Credit Facility will mature on January 30, 2031. The Credit Facility will accrue interest (a) with respect to base rate loans, at an annual rate equal to an applicable rate of between 0.50% and 2.00% (fluctuating based on the Company’s Consolidated Net Leverage Ratio, as defined in the Credit Agreement), plus a rate equal to the highest of (1) the Agent’s prime rate, (2) the federal funds rate plus one-half of 1.00%, (3) Daily Simple SOFR (as defined in the Credit Agreement) plus 1.00% and (4) 1.00%, (b) for all other loans, at an annual rate equal to an applicable rate of between 1.50% and 3.00% (fluctuating based on the Company’s Consolidated Net Leverage Ratio), plus a rate determined based on the denominated currency and, as applicable pursuant to the Credit

Agreement, whether the Company has elected for interest on such loans to accrue at a daily rate or a term rate: (a) for term rate loans, if denominated (1) in U.S. Dollars, Term SOFR (as defined in the Credit Agreement), (2) in euros, EURIBOR, (3) in Canadian dollars, the Term CORRA Rate (as defined in the Credit Agreement) plus 0.29547% for a one-month interest period and 0.32138% for a three-month interest period or (4) in a currency other than (1)-(3), the rate per annum as designated with respect to such currency at the time such currency was approved by the Agent and the other Lenders or, if such rate is unavailable on any date of determination for any reason, a comparable or successor rate approved by the Agent, and (b) for daily rate loans, if denominated (1) in U.S. dollars, Daily Simple SOFR (as defined in the Credit Agreement), (2) in pounds sterling, a rate per annum equal to SONIA (as defined in the Credit Agreement) plus 0.0326% per annum or (3) in a currency other than (1) or (2), the rate per annum as designated with respect to such currency at the time such currency was approved by the Agent and the other Lenders or, if such rate is unavailable on any date of determination for any reason, a comparable or successor rate approved by the Agent.

The proceeds of the Revolving Facility may be used for general corporate purposes of the Company and its subsidiaries (including, without limitation, for and in connection with consummation of the Longhorn Acquisition), and the proceeds of the Incremental Term A-1 Loan Facility may be used solely for and in connection with consummation of the Longhorn Acquisition. As of the Effective Date, approximately $254.8 million in aggregate principal amount of loans were outstanding under the Revolving Facility and $0 in aggregate principal amount of loans were outstanding under the Incremental Term A-1 Loan Facility.

Certain of the Lenders, as well as certain of their respective affiliates, have performed and may in the future perform for the Company, various commercial banking, investment banking, lending, underwriting, trust services, financial advisory and other financial services, for which they have received and may in the future receive customary fees and expenses.

The foregoing description of the Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the Amendment, a copy of which is attached hereto as Exhibit 10.1 and is incorporated by reference herein.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information set forth under Item 1.01 above is incorporated by reference herein.

No Offer or Solicitation

This communication is for informational purposes only and is not intended to and shall not constitute an offer to buy or sell or the solicitation of an offer to buy or sell any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made, except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

Additional Information and Where to Find It

This communication is being made in respect of the proposed merger transaction (the “Proposed Transaction”) involving Thermon and CECO, among other things. The issuance of shares of CECO common stock in connection with the Proposed Transaction will be submitted to the stockholders of CECO for their consideration, and the Proposed Transaction will be submitted to the stockholders of Thermon for their consideration. In connection therewith, CECO intends to file with the SEC a registration statement on Form S-4 (the “Registration Statement”) that will include a joint proxy statement/prospectus. Each of CECO and Thermon may also file other relevant documents with the SEC regarding the Proposed Transaction. This communication is not a substitute for the joint proxy statement/prospectus or registration statement or any other document that CECO or Thermon, as applicable, may file with the SEC in connection with the Proposed Transaction. After the Registration Statement has been declared effective by the SEC, a definitive joint proxy statement/prospectus will be mailed to the stockholders of CECO and Thermon. BEFORE MAKING ANY VOTING OR INVESTMENT DECISION, INVESTORS AND SECURITY HOLDERS OF CECO AND THERMON ARE URGED TO READ THE REGISTRATION STATEMENT, JOINT PROXY STATEMENT/PROSPECTUS AND ANY OTHER RELEVANT DOCUMENTS THAT MAY BE FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY IF AND WHEN THEY BECOME AVAILABLE BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT CECO, THERMON, THE PROPOSED

TRANSACTION AND RELATED MATTERS. Investors and security holders will be able to obtain free copies of the registration statement and joint proxy statement/prospectus, as well as other filings containing important information about CECO, Thermon and the Proposed Transaction, once such documents are filed with the SEC through the website maintained by the SEC at https://www.sec.gov. Copies of the documents filed with the SEC by CECO will be available free of charge on CECO’s website at https://investors.cecoenviro.com. Copies of the documents filed with the SEC by Thermon will be available free of charge on Thermon’s website at https://ir.thermon.com. The information included on, or accessible through, CECO’s or Thermon’s website is not incorporated by reference into this communication.

Participants in the Solicitation

CECO, Thermon and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of proxies in respect of the Proposed Transaction.

Information about the directors and executive officers of CECO, including a description of their direct or indirect interests, by security holdings or otherwise, is set forth in (i) CECO’s proxy statement for its 2025 Annual Meeting of Stockholders, which was filed with the SEC on April 10, 2025 (and which is available at https://www.sec.gov/ix?doc=/Archives/edgar/data/3197/000155837025004649/ceco-20250520xdef14a.htm), (ii) a Form 8-K filed by CECO on July 24, 2025 (and which is available at https://www.sec.gov/ix?doc=/Archives/edgar/data/0000003197/000095017025098303/ceco-20250718.htm), (iii) a Form 8-K filed by CECO on September 16, 2025 (and which is available at https://www.sec.gov/ix?doc=/Archives/edgar/data/0000003197/000119312525204657/ceco-20250912.htm) and (iv) to the extent holdings of CECO’s securities by the directors or executive officers of CECO have changed since the amounts set forth in CECO’s proxy statement for its 2025 Annual Meeting of Stockholders, such changes have been or will be reflected on Initial Statement of Beneficial Ownership of Securities on Form 3, Statement of Changes in Beneficial Ownership on Form 4, or Annual Statement of Changes in Beneficial Ownership on Form 5 filed with the SEC, which are available at https://www.sec.gov/cgi-bin/own-disp?action=getissuer&CIK=0000003197.

Information about the directors and executive officers of Thermon, including a description of their direct or indirect interests, by security holdings or otherwise, is set forth in (i) Thermon’s proxy statement for its 2025 Annual Meeting of Stockholders, which was filed with the SEC on June 18, 2025 (and which is available at https://www.sec.gov/Archives/edgar/data/1489096/000148909625000097/thr-20250618.htm), (ii) a Form 8-K filed by Thermon on July 1, 2025 (as amended July 15, 2025) (and which is available at https://www.sec.gov/ix?doc=/Archives/edgar/data/0001489096/000148909625000115/thr-20250701.htm) and (iii) to the extent holdings of Thermon’s securities by the directors or executive officers of Thermon’s have changed since the amounts set forth in Thermon’s proxy statement for its 2025 Annual Meeting of Stockholders, such changes have been or will be reflected on Initial Statement of Beneficial Ownership of Securities on Form 3, Statement of Changes in Beneficial Ownership on Form 4, or Annual Statement of Changes in Beneficial Ownership on Form 5 filed with the SEC, which are available at https://www.sec.gov/cgi-bin/own-disp?action=getissuer&CIK=0001489096.

Other information regarding the participants in the proxy solicitations and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the joint proxy statement/prospectus and other relevant materials to be filed with the SEC regarding the Proposed Transaction when such materials become available. Investors should read the joint proxy statement/prospectus carefully when it becomes available before making any voting or investment decisions. You may obtain free copies of these documents from CECO and Thermon using the sources indicated above.

Forward-Looking Statements

This communication contains “forward-looking statements” within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. All statements, other than statements of historical fact, included in this Form 8-K that address events, or developments that CECO and Thermon expect, believe, or anticipate will or may occur in the future are forward-looking statements. The words “intend,” “expect,” and similar expressions are intended to identify forward-looking statements. Forward-looking statements in this communication, but are not limited to, statements regarding the Proposed Transaction, pro forma descriptions of the combined company and its operations, integration and transition plans, synergies, opportunities and anticipated future performance. However, the absence of these words or similar expressions does not mean that a statement is not forward-looking.

There are a number of risks and uncertainties that could cause actual results to differ materially from the forward-looking statements included in this communication. These include the expected timing and likelihood of completion

of the Proposed Transaction, including the timing, receipt and terms and conditions of any required governmental and regulatory approvals of the Proposed Transaction that could reduce anticipated benefits or cause the parties to abandon the Proposed Transaction, the ability to successfully integrate the businesses, the occurrence of any event, change or other circumstances that could give rise to the termination of the Merger Agreement, the possibility that stockholders of CECO or Thermon may not approve the Proposed Transaction, the risk that the parties may not be able to satisfy the conditions to the Proposed Transaction in a timely manner or at all, risks related to disruption of management time from ongoing business operations due to the Proposed Transaction, the risk that any announcements relating to the Proposed Transaction could have adverse effects on the market price of CECO’s common stock or Thermon’s common stock, the risk that the Proposed Transaction and its announcement could have an adverse effect on the ability of CECO and Thermon to retain customers and retain and hire key personnel and maintain relationships with their suppliers and customers and on their operating results and businesses generally, the risk the pending Proposed Transaction could distract management of both entities and they will incur substantial costs, the risk that problems may arise in successfully integrating the businesses of the companies, which may result in the combined company not operating as effectively and efficiently as expected, the risk that the combined company may be unable to achieve synergies or it may take longer than expected to achieve those synergies and other important factors that could cause actual results to differ materially from those projected. All such factors are difficult to predict and are beyond CECO’s or Thermon’s control, including those detailed in CECO’s annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K that are available on its website at https://investors.cecoenviro.com and on the SEC’s website at https://www.sec.gov, and those detailed in Thermon’s annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K that are available on Thermon’s website at https://ir.thermon.com and on the SEC’s website at https://www.sec.gov.

All forward-looking statements are based on assumptions that CECO or Thermon believe to be reasonable but that may not prove to be accurate. Such forward-looking statements are based on assumptions and analyses made by CECO and Thermon in light of their perceptions of current conditions, expected future developments, and other factors that CECO and Thermon believe are appropriate under the circumstances. These statements are subject to a number of known and unknown risks and uncertainties. Forward-looking statements are not guarantees of future performance and actual events may be materially different from those expressed or implied in the forward-looking statements. The forward-looking statements in this communication speak as of the date of this communication.

Neither CECO nor Thermon undertakes, and each of them expressly disclaims, any duty to update any forward-looking statement whether as a result of new information, future events or otherwise, except as required by law. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as the date hereof.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

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.