Material Agreement, Financial Obligation (Form 8-K)

ITEM 1.01 Entry into a Material Definitive Agreement.

Amendment No. 2 to Credit Agreement

On October 23, 2025, AdvanSix Inc. (the "Company") entered into Amendment No. 2 (the "Amendment") to the Credit Agreement, dated as of October 27, 2021 (as amended by Amendment No. 1, dated June 27, 2023, the "Existing Credit Agreement" and as further amended by the Amendment, the "Amended Credit Agreement"), among the Company, the guarantors, the lenders party thereto and Truist Bank, as administrative agent. Any capitalized terms not defined herein shall have the definitions ascribed to them in the Amended Credit Agreement.

The Existing Credit Agreement includes a senior secured revolving credit facility with aggregate commitments of $500 million (the "Revolving Credit Commitments"). Pursuant to the Amendment, the Existing Credit Agreement was amended to, among other things: (i) extend the maturity date of revolving credit commitments of participating Revolving Credit Lenders in an aggregate principal amount of $452 million to the earlier of (x) October 27, 2027 and (y) the date of the termination in whole of the Revolving Credit Commitments, pursuant to the terms of the Amended Credit Agreement, and (ii) effect certain other conforming changes and modifications consistent with the foregoing. The remaining $48 million of revolving credit commitments under the Existing Credit Agreement that were not extended will continue to mature on the earlier of (x) October 27, 2026 and (y) the date of the termination in whole of the Revolving Credit Commitments, pursuant to the terms of the Amended Credit Agreement.

The foregoing description does not purport to be complete and is qualified in its entirety by reference to the Amendment, a copy of which is filed as Exhibit 10.1 to this Current Report on Form 8-K, and the Amended Credit Agreement, which is included as Annex I to the Amendment, each of which is incorporated by reference herein.

ITEM 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information set forth in Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference.