Huntsman CORP

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HUNTSMAN CORPORATION: PROXY STATEMENT

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GENERAL

This Proxy Statement is being furnished to the stockholders of Huntsman in connection with the solicitation of proxies by the Board. The proxies are to be voted at the Annual Meeting to be held on Wednesday, April 30, 2025, at 8:00 a.m. Central Time by virtual meeting atww.virtualshareholdermeeting.com/HUN2025 for the purposes set forth in the accompanying Notice of Annual Meeting. You will not be able to attend the Annual Meeting physically.

The Board is soliciting your proxy to vote your shares at the Annual Meeting. We will bear the cost of the solicitation, including the cost of the preparation, assembly, printing and, where applicable, mailing of the Notice of Annual Meeting of Stockholders, this Proxy Statement, the proxy card and any additional information furnished by us to our stockholders. In addition to solicitation by mail, certain of our directors, officers and employees may, without extra compensation, solicit proxies by telephone, facsimile, electronic means and personal interview. We have retained Innisfree M&A Incorporated to help us distribute and solicit proxies and agreed to pay them $17,500 and reimburse them for out-of-pocket expenses for these services. We will also make arrangements with brokerage houses, custodians, nominees, and other fiduciaries to send proxy materials to their principals, and we will reimburse them for postage and clerical expenses.

ADDITIONAL DETAILS REGARDING THE ANNUAL MEETING

ANNUAL MEETING LOG-IN INSTRUCTIONS

Because the Annual Meeting will be held virtually, there is no physical meeting location. To participate in the virtual Annual Meeting, holders of shares of our common stock as of the close of business on March 7, 2025 (the record date for the Annual Meeting) should log in to the live webcast of the Annual Meeting atwww.virtualshareholdermeeting.com/HUN2025.

To join the live webcast and participate in the virtual Annual Meeting (e.g., submit questions and/or vote your shares), you will need the 16-digit control number included on your proxy card and voting instruction form. Online access to the live webcast will open approximately 15 minutes prior to the start of the Annual Meeting. We recommend that you log in to the Annual Meeting several minutes before its scheduled start time.

If you are the representative of a trust or corporation, limited liability company, partnership or other legal entity that holds shares of our common stock, you will need the 16-digit control number included on the proxy card and voting instruction form of that legal entity in order to attend and participate in the virtual Annual Meeting.

No audio, video or other form of recording of the Annual Meeting is allowed. If you are not a stockholder at the close of business on March 7, 2025 (the record date for the Annual Meeting) or do not have a control number, you will not be able to access the Annual Meeting.

STOCKHOLDER ACCESS DURING THE ANNUAL MEETING

We are sensitive to the fact that virtual meetings provide a different forum than traditional in-person meetings and are committed to ensuring that stockholders will be afforded the same rights and opportunities to attend and participate in our virtual Annual Meeting as they would an in-person meeting. In particular, we believe the design of our virtual platform enhances, rather than constrains, stockholder access and participation. For example, our virtual platform will allow stockholders to vote their shares electronically during the live webcast and to submit questions for a live Q&A session that will be held at the end of the Annual Meeting.

SUBMITTING QUESTIONS AND VOTING YOUR SHARES AT THE ANNUAL MEETING

Submitting Questions: Stockholders as of the record date who attend and participate in our virtual Annual Meeting atwww.virtualshareholdermeeting.com/HUN2025 will have an opportunity to submit questions via the Internet during the meeting. We are committed to answering stockholders’ questions in the order in which they are received, subject to the Rules of Conduct governing the Annual Meeting, just as we have been at our past in-person and virtual meetings. We reserve the right to edit or