AdvanSix Inc. 10-Q

ITEM 5. OTHER INFORMATION Insider Rule 10b5-1 Trading Plans On March 13, 2026 , Achilles B. Kintiroglou , the Company’s Senior Vice President, General Counsel and Corporate Secretary , entered into a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. The plan provides for the sale of 2,000 shares and the exercise and sale of 2,530 stock options. Mr. Kintiroglou’s plan will expire on March 5, 2027 . On March 13, 2026 , Erin N. Kane , the Company’s President and Chief Executive Officer , entered into a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. The plan provides for the sale of 52,500 shares and the exercise and sale of 53,688 stock options. Ms. Kane’s plan will expire on March 5, 2027 . 27 ITEM 6. EXHIBITS Exhibit Description 3.1 Amended and Restated Certificate of Incorporation of AdvanSix Inc. (conformed copy) (incorporated by reference to Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q filed on August 1, 2025) 3.2 Amended and Restated By-laws of AdvanSix Inc. (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on June 20, 2023). 31.1 Rule 13a-14(a)/15d-14(a) Certification of the Company’s Principal Executive Officer. 31.2 Rule 13a-14(a)/15d-14(a) Certification of the Company’s Principal Financial Officer. 32.1 Section 1350 Certification of the Company’s Principal Executive Officer. The information contained in this Exhibit shall not be deemed filed with the SEC nor incorporated by reference in any registration statement filed by the registrant under the Securities Act of 1933, as amended. 32.2 Section 1350 Certification of the Company’s Principal Financial Officer. The information contained in this Exhibit shall not be deemed filed with the SEC nor incorporated by reference in any registration statement filed by the registrant under the Securities Act of 1933, as amended. 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 Document 101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document 101.DEF Inline XBRL Taxonomy Extension Definition Linkbase Document 101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document 101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document 104 Cover Page Interactive Data File (formatted as Inline XBRL and included in Exhibit 101) 28 SIGNATURE 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. ADVANSIX INC. Date: May 8, 2026 By: /s/ Patrick C. Day Patrick C. Day Senior Vice President and Chief Financial Officer 29