Huntsman Corporation and Rockwood Holdings, Inc. have completed an important milestone in Huntsman's pending acquisition of Rockwood's Performance Additives and titanium dioxide (TiO2) businesses. The waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 has expired. Therefore, the antitrust review in the United States is now complete. They continue to work through the regulatory process in the European Union. As previously disclosed, Huntsman anticipate closing the transaction with Rockwood in the first half of 2014.