FULLER H B CO 10-Q

Item 5. Other Information Rule 10b5 - 1 Plan Adoptions and Modifications None. Item 6. Exhibits 31.1 Form of 302 Certification – Celeste B. Mastin 31.2 Form of 302 Certification – John J. Corkrean 32.1 Form of 906 Certification – Celeste B. Mastin 32.2 Form of 906 Certification – John J. Corkrean 101 The following materials from the H.B. Fuller Company Quarterly Report on Form 10-Q for the quarter ended August 30, 2025 formatted in Inline Extensible Business Reporting Language (Inline XBRL): (i) the Consolidated Statements of Income, (ii) the Consolidated Statements of Comprehensive Income, (iii) the Consolidated Balance Sheets, (iv) the Consolidated Statements of Total Equity, (v) the Consolidated Statements of Cash Flows and (vi) the Notes to Consolidated Financial Statements. 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101). * Asterisked items are management contracts or compensatory plans or arrangements required to be filed. (1) Incorporated by reference to Appendix B to the H.B. Fuller Company Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 4, 2025 41 Table of Contents 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 thereunto duly authorized. H.B. Fuller Company Dated: September 25, 2025 /s/ John J. Corkrean John J. Corkrean Executive Vice President, Chief Financial Officer Exhibit Index Exhibits 31.1 Form of 302 Certification – Celeste B. Mastin 31.2 Form of 302 Certification – John J. Corkrean 32.1 Form of 906 Certification – Celeste B. Mastin 32.2 Form of 906 Certification – John J. Corkrean 101 The following materials from the H.B. Fuller Company Quarterly Report on Form 10-Q for the quarter ended August 30, 2025 formatted in Inline Extensible Business Reporting Language (Inline XBRL): (i) the Consolidated Statements of Income, (ii) the Consolidated Statements of Comprehensive Income, (iii) the Consolidated Balance Sheets, (iv) the Consolidated Statements of Total Equity, (v) the Consolidated Statements of Cash Flows and (vi) the Notes to Consolidated Financial Statements. 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101). * Asterisked items are management contracts or compensatory plans or arrangements required to be filed. (1) Incorporated by reference to Appendix B to the H.B. Fuller Company Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 4, 2025 42