144 0001806189 XXXXXXXX LIVE 0001673985 AdvanSix Inc. 001-37774 300 KIMBALL DRIVE SUITE 101 PARSIPPANY NJ 07054 (973) 526-1800 Kintiroglou Achilles B. Officer Common Stock Merrill Lynch

225 Liberty St Floor 37 New York NY 10281

577 11540.00 26844187 10/03/2025 NYSE Common Stock 02/28/2025 02/28/2025 AdvanSix Inc. N 577 02/28/2025 Vesting of restricted stock unit award N Achilles Kintiroglou

300 KIMBALL DRIVE PARSIPPANY NJ 07054

Common Stock 09/02/2025 571 12105.20 Achilles Kintiroglou

300 KIMBALL DRIVE PARSIPPANY NJ 07054

Common Stock 08/01/2025 571 11522.78 10/03/2025 11/12/2024 Achilles Kintiroglou