Quanex Building Products Corporation has identified a material weakness in its internal control over financial reporting related to the preparation and review of its statement of cash flows. This issue was first disclosed in the company's annual report for the fiscal year ended October 31, 2024, and continued to exist as of the latest filings. As a result, the company's former independent auditor, Grant Thornton LLP, issued adverse opinions on Quanex's internal control over financial reporting for both fiscal years 2024 and 2025. The company recently appointed KPMG LLP as its new independent public accounting firm for the fiscal year ending October 31, 2026.

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