Exhibit 99.1 News Release FOR IMMEDIATE RELEASE Media: Investor Relations: February 21, 2024 Kevin Gundersen Ivan Marcuse The Woodlands, TX (281) 719-4627 (281) 719-4637 NYSE: HUN Huntsman Announces Fourth Quarter 2023 Earnings Fourth Quarter Highlights · Fourth quarter 2023 net loss attributable to Huntsman of $71 million compared to a net loss of$91 million in the prior year period; fourth quarter 2023 diluted loss per share of $0.41 compared to a diluted loss per share$0.48 in the prior year period. · ...