Exhibit 99.1 Reporting Person: MatlinPatterson LLC Issuer Name and Ticker Symbol: Huntsman Corporation (HUN) Date of Event Requiring Statement: 2/16/05 Joint Filer Information Each of the following filers have designated MatlinPatterson LLC as the ("Designated Filer") for purposes of the attached Form 4. (1) MatlinPatterson Asset Management LLC 520 Madison Avenue New York New York 10022 (2) MatlinPatterson Global Opportunities Partners L.P. 520 Madison Avenue New York New York 10022 (3) MatlinPatterson Global Opportunities Partners B, L.P. 520 Madison Avenue New York New York 10022 (4) MatlinPatterson Global Opportunities Partners (Bermuda) L.P. 520 Madison Avenue New York New York 10022 (5) MatlinPatterson Global Partners LLC 520 Madison Avenue New York New York 10022 (6) MatlinPatterson Global Advisers LLC 520 Madison Avenue New York New York 10022 (7) Mark R. Patterson 520 Madison Avenue New York New York 10022 (8) David J. Matlin 520 Madison Avenue New York New York 10022 Date: February 18, 2005 MATLINPATTERSON ASSET MANAGEMENT LLC By: /s/ MARK R. PATTERSON ------------------------------------------ Name: Mark R. Patterson Title: Chairman Date: February 18, 2005 MATLINPATTERSON GLOBAL OPPORTUNITIES PARTNERS L.P. By: MatlinPatterson Global Partners LLC as general partner By: /s/ MARK R. PATTERSON ------------------------------------ Name: Mark R. Patterson Title: Director Date: February 18, 2005 MATLINPATTERSON GLOBAL OPPORTUNITIES PARTNERS B, L.P. By: MatlinPatterson Global Partners LLC as general partner By: /s/ MARK R. PATTERSON ------------------------------------ Name: Mark R. Patterson Title: Director Date: February 18, 2005 MATLINPATTERSON GLOBAL OPPORTUNITIES PARTNERS (BERMUDA) L.P. By: MatlinPatterson Global Partners LLC as general partner By: /s/ MARK R. PATTERSON ------------------------------------ Name: Mark R. Patterson Title: Director Date: February 18, 2005 MATLINPATTERSON GLOBAL PARTNERS LLC By: /s/ MARK R. PATTERSON ------------------------------------------ Name: Mark R. Patterson Title: Director Date: February 18, 2005 MATLINPATTERSON GLOBAL ADVISERS LLC By: /s/ MARK R. PATTERSON ------------------------------------------ Name: Mark R. Patterson Title: Chairman Date: February 18, 2005 MARK R. PATTERSON By: /s/ MARK R. PATTERSON ------------------------------------------ Name: Mark R. Patterson Date: February 18, 2005 DAVID J. MATLIN By: /s/ DAVID J. MATLIN ------------------------------------------ Name: David J. Matlin