STEPAN CO 10-Q

Item 5 – Other Information During the three months ended June 30, 2026 , no director or officer of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K. Item 6 – Exhibits Exhibit No. Description 31.1 – Certification of President and Chief Executive Officer pursuant to Exchange Act Rule 13a-14(a)/15d-14(a) 31.2 – Certification of Vice President and Chief Financial Officer pursuant to Exchange Act Rule 13a- 14(a)/15d-14(a) 32 – Certification pursuant to 18 U.S.C. Section 1350 101.INS – Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document 101.SCH – Inline XBRL Taxonomy Extension Schema with Embedded Linkbases Document 104 – Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) 42 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. STEPAN COMPANY Date: August 5, 2026 /s/ Ruben D. Velasquez Ruben D. Velasquez Vice President and Chief Financial Officer 43