AdvanSix(ASIX) - 2025 Q3 - Quarterly Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 For the quarterly period ended September 30, 2025 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ☐ For the transition period from _____ to _____ Commission File Number: 1-37774 AdvanSix Inc. FORM 10-Q (Mark One) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF ☒ 1934 (Exact name of registrant as specified in its charter) Delaware 81-2525089 (State or other ju ...