asix-20260429

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934 (Amendment No. )


Filed by the Registrant x
Filed by a party other than the Registrant o
Check the appropriate box:
o			Preliminary Proxy Statement
o			Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
x			Definitive Proxy Statement
o			Definitive Additional Materials
o			Soliciting Material under §240.14a-12


AdvanSix Inc.
(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):


x			No fee required.
o			Fee paid previously with preliminary materials.
o			Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

2026

Proxy Statement

and Notice of Annual Meeting

of Stockholders

300 Kimball Drive, Suite 101

Parsippany, New Jersey 07054

April 29, 2026

To our Stockholders:

You are cordially invited to attend the Annual Meeting of Stockholders of AdvanSix Inc. (the "Annual Meeting"), which will be held at 9:00 a.m. Eastern Time on Monday, June 22, 2026. The Annual Meeting will be a completely virtual meeting conducted via live audio webcast to enable our stockholders to participate remotely from any location. You will be able to attend the Annual Meeting by visiting www.virtualshareholdermeeting.com/ASIX2026. See “Attendance at the Virtual Annual Meeting” in the proxy statement for additional information regarding how to attend and participate at the Annual Meeting.

The accompanying notice of meeting and proxy statement describe the matters to be voted on at the meeting. You will be asked to elect directors, to ratify the appointment of the independent accountants, and to cast an advisory vote to approve executive compensation.

The Board of Directors recommends that you vote “FOR” each of the director nominees named in Proposal 1, and "FOR" Proposals 2 and 3:

Proposal 1: Election of nine Director Nominees to the Board of Directors

Proposal 2: Ratification of Appointment of Independent Registered Public Accountants

Proposal 3: Advisory Vote to Approve Executive Compensation

YOUR VOTE IS IMPORTANT. We encourage you to read the proxy statement and vote your shares as soon as possible. Stockholders may vote via the Internet, by telephone, by completing and returning a proxy card or voting instruction form or by scanning the QR code provided on the Notice of Internet Availability of Proxy Materials, the next page in the Notice of Annual Meeting of Stockholders or on the proxy card. Specific voting instructions are set forth in the proxy statement and on both the Notice of Internet Availability of Proxy Materials and the proxy card.

On behalf of the Board of Directors, thank you for your continued support of AdvanSix.

Sincerely,




Todd D. Karran						Erin N. Kane
Chair of the Board						President and Chief Executive Officer

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

DATE: Monday, June 22, 2026

TIME: 9:00 a.m. Eastern Time

LOCATION: Virtual meeting conducted via live audio webcast at www.virtualshareholdermeeting.com/ASIX2026

RECORD DATE: Close of business on April 24, 2026

Meeting Agenda:

•Election of the nine director nominees to the Board of Directors;

•Ratification of the appointment of PricewaterhouseCoopers LLP as our independent registered public accountants for 2026;

•Advisory vote to approve executive compensation; and

•Transact any other business that may properly come before the meeting.

Important Notice of Internet Availability of Proxy Materials

The Securities and Exchange Commission’s “Notice and Access” rule enables AdvanSix to deliver a Notice of Internet Availability of Proxy Materials to stockholders in lieu of a paper copy of the proxy statement, related materials and the Company’s Annual Report to Stockholders. The Notice contains instructions on how to access our Proxy Statement and 2025 Annual Report and how to vote online.

Shares cannot be voted by marking, writing on and/or returning the Notice of Internet Availability. Any Notices of Internet Availability that are returned will not be counted as votes. We encourage stockholders to vote promptly as this will save the expense of additional proxy solicitation. Stockholders of record on the record date are entitled to vote at the meeting or in the following ways:

By Telephone

By Internet

By Mail

By Scanning

In the U.S. or Canada, you can vote your shares by calling +1 (800) 690-6903. You will need the 16-digit control number on the Notice of Internet Availability or proxy card.

You can vote your shares online at www.proxyvote.com. You will need the 16-digit control number on the Notice of Internet Availability or proxy card.

You can vote your shares by mail by marking, dating and signing your proxy card or voting instruction form and returning it in the postage-paid envelope.

You can vote your shares online by scanning the QR code above. You will need the 16-digit control number on the Notice of Internet Availability or proxy card. Additional software may need to be downloaded.

How to Attend the 2026 Virtual Annual Meeting: To be admitted to the Annual Meeting at www.virtualshareholdermeeting.com/ASIX2026, you must enter the 16-digit control number on your Notice of Internet Availability or proxy card. At the virtual Annual Meeting, you will have the opportunity to vote and to ask questions by following the instructions provided on the meeting website. Whether or not you plan to attend the virtual meeting, we encourage you to vote and submit your proxy in advance of the meeting by one of the methods described above.

This Notice of Annual Meeting of Stockholders and related Proxy Materials are being distributed or made available to stockholders beginning on or about April 29, 2026.

By Order of the Board of Directors,

SEC Form DEF 14A filed by AdvanSix Inc.