Lonza Commences Tender Offer to Acquire All of the Outstanding Shares of Arch Chemicals $47.20/Share

Lonza Group Ltd today announced that an indirect wholly owned subsidiary of Lonza, LG Acquisition Corp., has commenced the previously announced offer to acquire all of the outstanding shares of common stock of Arch Chemicals, Inc. ARJ at a price of USD 47.20 per share, net to the seller in cash, without interest and less any required withholding of taxes. Lonza and Arch Chemicals announced on 11 July 2011 the signing of a definitive merger agreement pursuant to which the tender offer would be made. The board of directors of Arch Chemicals has unanimously approved the terms of the merger agreement and recommended that Arch Chemicals shareholders tender their shares pursuant to the tender offer. Today, Lonza and LG Acquisition Corp. are filing a tender offer statement on Schedule TO (including an offer to purchase, form of letter of transmittal and related tender offer documents) with the U.S. Securities and Exchange Commission (the "SEC"), and Arch Chemicals is filing with the SEC a solicitation/recommendation statement on Schedule 14D-9 with respect to the tender offer. The tender offer is scheduled to expire at 12:00 midnight, New York City time, on August 11, 2011, unless the tender offer is extended or earlier terminated in accordance with the terms of the merger agreement and the applicable rules and regulations of the SEC. Any extension of the tender offer will be followed as promptly as practicable by public announcement thereof, and such announcement will be made no later than 9:00 a.m. Eastern time on the next business day after the previously scheduled expiration date.