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Auditor switch at Quanex Building Products (NYSE: NX) amid control issue

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
8-K

Rhea-AI Filing Summary

Quanex Building Products Corporation reported that its audit committee dismissed Grant Thornton LLP as its independent registered public accounting firm and appointed KPMG LLP for the fiscal year ending October 31, 2026. Grant Thornton’s audit reports on the company’s 2024 and 2025 financial statements were clean, with no adverse or qualified opinions and no disagreements on accounting, disclosure, or audit scope. However, Grant Thornton issued adverse opinions on internal control over financial reporting for both years because of a material weakness in the design and operation of controls over preparing and reviewing the statement of cash flows, first identified in the fourth quarter of 2024 and still present as of this report. The company has authorized Grant Thornton to fully cooperate with KPMG and has filed Grant Thornton’s confirmation letter as an exhibit.

Positive

  • None.

Negative

  • None.

Insights

Quanex changes auditors while an existing control weakness remains unresolved.

Quanex Building Products replaced Grant Thornton with KPMG as its independent auditor for the fiscal year ending October 31, 2026. The filing emphasizes that Grant Thornton’s opinions on the 2024 and 2025 financial statements were unqualified and that there were no disagreements on accounting policies, disclosures, or audit procedures, which helps frame the change as a governance decision rather than a dispute.

The notable concern is the ongoing material weakness in internal control over financial reporting related to preparing and reviewing the statement of cash flows. Grant Thornton issued adverse opinions on internal control for both 2024 and 2025 on this basis, and the weakness is explicitly stated to still exist as of this report. This suggests remediation is taking longer than one annual cycle, which can matter for confidence in reporting quality even though it has not led to modified financial statement opinions.

The committee has authorized Grant Thornton to fully respond to KPMG’s inquiries, and a confirmation letter from Grant Thornton agreeing with these disclosures is included as an exhibit dated January 16, 2026. Subsequent annual and quarterly reports will be important for seeing whether management and the new auditor conclude that the material weakness has been remediated and internal control opinions return to effective.

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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

 

January 13, 2026

(Date of earliest event reported)_____________________

 

QUANEX BUILDING PRODUCTS CORPORATION

(Exact name of registrant as specified in its charter)

 

Delaware   1-33913   26-1561397
(State or other jurisdiction
of incorporation)
  (Commission File Number) (IRS Employer Identification No.)

 

945 Bunker Hill Road, Suite 900,

Houston, Texas

77024
(Address of principal executive offices) (Zip Code)

 

Registrant’s telephone number, including area code: 713- 961-4600

 

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 (b) 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, par value $0.01 per share NX 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 (§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 4.01Change in Registrant’s Certifying Accountant.

 

(a) Dismissal of Independent Registered Public Accounting Firm

 

The Audit Committee (the “Committee”) of the Board of Directors of Quanex Building Products Corporation (the “Company”) conducted a competitive process to select the audit firm to serve as the Company’s independent registered public accounting firm for the fiscal year ending October 31, 2026. Following that process, on January 13, 2026, KPMG LLP (“KPMG”) was appointed to serve as the Company’s independent public accounting firm for the fiscal year ending October 31, 2026. On the same day, the Company notified Grant Thornton LLP (“Grant Thornton”) of its dismissal as the Company’s independent registered public accounting firm, effective immediately. The decision to change the Company’s independent registered public accounting firm was approved by the Committee.

 

Grant Thornton’s audit reports on the Company’s consolidated financial statements for each of the fiscal years ended October 31, 2025, and October 31, 2024, did not contain an adverse opinion or a disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope, or accounting principles. Furthermore, during each of the fiscal years ended October 31, 2025, and October 31, 2024 and through the date of dismissal: (i) there were no “disagreements,” as that term is defined in Item 304(a)(1)(iv) of Regulation S-K (“Regulation S-K”), between the Company and Grant Thornton on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure, which disagreements, if not resolved to the satisfaction of Grant Thornton, would have caused Grant Thornton to make reference thereto in their reports; and (ii) no “reportable events” within the meaning of Item 304(a)(1)(v) of Regulation S-K except for the following material weakness in internal control over financial reporting that existed as of the fiscal years ended October 31, 2025 and October 31, 2024.

 

Each of Grant Thornton’s reports on the Company’s internal control over financial reporting as of October 31, 2025, and October 31, 2024, contained an adverse opinion, specifically, that the Company did not maintain effective internal control over financial reporting as of the end of the period covered by such report due to the effect of a material weakness described in such reports. In the Company’s Annual Report on Form 10-K for the year ended October 31, 2024, filed on December 16, 2024 (the “2024 Annual Report”), management disclosed that a material weakness in the design and operation of controls over the preparation and review of the Company’s statement of cash flows was identified in the fourth quarter of 2024. Subsequent to the issuance of the 2024 Annual Report, this material weakness continues to exist as of the date of this Current Report on Form 8-K. The Company’s management previously reported this material weakness in Part II, Item 9A of its Annual Report on Form 10-K for the fiscal year ended October 31, 2025, filed on December 12, 2025, and in Part II, Item 9A of the 2024 Annual Report.

 

The Committee has authorized Grant Thornton to respond fully to the inquiries of KPMG concerning the foregoing reportable events and related matters.

 

The Company provided Grant Thornton with a copy of the disclosures in this Current Report on Form 8-K and requested that Grant Thornton provide the Company with a letter addressed to the Securities and Exchange Commission (the “SEC”) stating whether Grant Thornton agrees to the statements made by the Company herein. A copy of the letter from Grant Thornton addressed to the SEC and dated as of January 16, 2026 is filed as Exhibit 16.1 to this Current Report on Form 8-K.

 

(b) Appointment of New Independent Registered Public Accounting Firm

 

On January 13, 2026, the Committee approved the engagement of KPMG as the Company’s independent public accounting firm for the fiscal year ending October 31, 2026, effective immediately.

 

During the fiscal years ended October 31, 2025 and 2024 and the subsequent interim period through the date of dismissal, neither the Company nor anyone on its behalf has consulted with KPMG regarding: (i) the application of accounting principles to a specific transaction, either completed or proposed, or the type of audit opinion that might be rendered on the Company’s financial statements, and neither a written report nor oral advice was provided to the Company that KPMG concluded was an important factor considered by the Company in reaching a decision as to any accounting, auditing, or financial reporting issue; (ii) any matter that was the subject of a disagreement within the meaning of Item 304(a)(1)(iv) of Regulation S-K and the related instructions; or (iii) any reportable event within the meaning of Item 304(a)(1)(v) of Regulation S-K.

 

 

 

 

Item 9.01Financial Statements and Exhibits.

 

(d) Exhibits

 

Exhibit
Number
  Description
     
16.1   Letter from Grant Thornton, LLP to the U.S. Securities and Exchange Commission, dated January 16, 2026
104   Cover Page Interactive Data File (formatted as Inline XBRL document)

 

 

 

 

SIGNATURE

 

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.

 

  QUANEX BUILDING PRODUCTS CORPORATION
  (Registrant)
   
January 16, 2026 /s/ Paul B. Cornett
(Date) Paul B. Cornett
  Senior Vice President – General Counsel and Secretary

 

 

 

FAQ

What change in auditors did Quanex Building Products (NX) disclose?

The company’s audit committee dismissed Grant Thornton LLP as its independent registered public accounting firm and appointed KPMG LLP for the fiscal year ending October 31, 2026, effective January 13, 2026.

Did Grant Thornton have disagreements with Quanex Building Products (NX)?

The company states there were no disagreements with Grant Thornton on accounting principles, financial statement disclosure, or auditing scope or procedures during the fiscal years ended October 31, 2024 and 2025 and through the dismissal date.

What material weakness did Quanex Building Products (NX) report?

Quanex reports a material weakness in internal control over financial reporting related to the design and operation of controls over preparation and review of the statement of cash flows, first identified in the fourth quarter of 2024.

Is the internal control weakness at Quanex Building Products (NX) still present?

Yes. The filing states that the material weakness in controls over the statement of cash flows, disclosed in prior annual reports, continues to exist as of the date of this Form 8-K.

How did Grant Thornton report on Quanex Building Products’ (NX) financial statements?

Grant Thornton’s audit reports on the consolidated financial statements for the years ended October 31, 2024 and 2025 did not contain adverse opinions or qualifications regarding uncertainty, audit scope, or accounting principles.

What exhibit related to Grant Thornton is included in this Quanex (NX) filing?

The company filed as an exhibit a letter from Grant Thornton LLP to the SEC dated January 16, 2026, stating whether it agrees with the company’s disclosures about the auditor change and related matters.
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