Results of Operations and Financial Condition. On September 3, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Regulation FD Disclosure. On August 27, 2026, the Registrant issued a press release announcing that the Board declared a quarterly cash dividend of $0.08 per share on the Company’s common stock, payable September 30, 2026, to shareholders of record on September 15, 2026. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Results of Operations and Financial Condition. On June 4, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Regulation FD Disclosure. On May 28, 2026, the Registrant issued a press release announcing that the Board declared a quarterly cash dividend of $0.08 per share on the Company’s common stock, payable June 30, 2026, to shareholders of record on June 15, 2026. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Results of Operations and Financial Condition. On March 5, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Regulation FD Disclosure. On February 26, 2026, the Registrant issued a press release announcing that the Board declared a quarterly cash dividend of $0.08 per share on the Company’s common stock, payable March 31, 2026, to shareholders of record on March 17, 2026. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Change 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 C…

Results of Operations and Financial Condition. On December 11, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Regulation FD Disclosure. On December 5, 2025, the Registrant issued a press release announcing that the Board declared a quarterly cash dividend of $0.08 per share on the Company’s common stock, December 31, 2025, to shareholders of record on December 15, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Director — Mary K. Lawler: The filing discloses the appointment of a new independent director to the Board, which is a routine governance event and not a departure of a senior executive.

Vice President, Chief Accounting Officer — Gabriela Garcia: Gabriela Garcia was appointed as Vice President, Chief Accounting Officer.

Results of Operations and Financial Condition. On September 4, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Regulation FD Disclosure. On May 30, 2025, the Registrant issued a press release announcing that the Board declared a quarterly cash dividend of $0.08 per share on the Company’s common stock, payable September 30, 2025, to shareholders of record on September 16, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Results of Operations and Financial Condition. On June 5, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Regulation FD Disclosure. On May 30, 2025, the Registrant issued a press release announcing that the Board declared a quarterly cash dividend of $0.08 per share on the Company's common stock, payable June 30, 2025, to shareholders of record on June 16, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Results of Operations and Financial Condition. On March 10, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Regulation FD Disclosure. On February 27, 2025, the Registrant issued a press release announcing that the Board declared a quarterly cash dividend of $0.08 per share on the Company's common stock, payable March 31, 2025, to shareholders of record on March 17, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Results of Operations and Financial Condition. On December 12, 2024, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Regulation FD Disclosure. On December 6, 2024, the Registrant issued a press release announcing that the Board declared a quarterly cash dividend of $0.08 per share on the Company’s common stock, payable December 31, 2024, to shareholders of record on December 16, 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Results of Operations and Financial Condition. On September 5, 2024, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Regulation FD Disclosure. On August 30, 2024, the Registrant issued a press release announcing that the Board declared a quarterly cash dividend of $0.08 per share on the Company’s common stock, payable September 30, 2024, to shareholders of record on September 16, 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Director — Manish H. Shah, Amit Singhi: The filing discloses the appointment of two new directors to the Board, which is a routine governance event and not a departure of a senior executive.

Unregistered Sales of Equity Securities. The information under

Completion of Acquisition or Disposition of Assets. On August 1, 2024, Quanex Building Products Corporation, a Delaware corporation (“Quanex” or the “Company”), completed its previously announced acquisition (the “Transaction”) of Tyman plc, a company incorporated in England and Wales (“Tyman”). The Transaction was effected by means of a court-sanctioned scheme of arrangement under Part 26 of the UK Companies Act 2006 (the “Scheme”). On April 22, 2024, the Company issued an announcement (the…

Other Events On July 12, 2024, the Company issued a press release announcing the results of the stockholder vote on the Share Issuance Proposal at the Special Meeting. The full text of the press release, a copy of which is attached hereto as Exhibit 99.1, is incorporated herein by reference. Forward Looking Statements This Current Report on Form 8-K contains certain “forward-looking statements”. These statements are based on the current expectations of the management of Quanex and are natural…