Wesel, April 29, 2010

Ad hoc announcement pursuant to Section 15 of the German Securities Trading Act (WpHG): Cash compensation for ALTANA shares fixed at Euro 15.01 per share

SKion GmbH has informed ALTANA AG that it has fixed the cash compensation for the transfer of shares of the remaining shareholders (minority shareholders) of ALTANA to SKion GmbH (Squeeze out) at € 15.01 per share. SKion GmbH thereby specifies its request of February 2, 2010 pursuant to section 327a (1) of the German Stock Corporation Act that the ALTANA shareholders‘ meeting resolves a transfer of the remaining shares to the major shareholder in return for an appropriate cash compensation (squeeze out). At the Annual General Meeting of ALTANA to be held on June 30, 2010 in Duisburg a resolution to this effect is to be passed.

This announcement contains forward-looking statements, i.e. current estimates or expectations of future events or future results. These statements are based on beliefs of ALTANA as well as assumptions made by and information currently available to ALTANA. Forward-looking statements speak only as of the date they are made. ALTANA does not intend, and does not assume any obligation, to update forward-looking statements to reflect facts, circumstances or events that have occurred or changed after such statements have been made.

ALTANA develops and produces high-quality innovative products in the specialty chemicals business. The ALTANA Group, with headquarters in Wesel/Germany, is a genuine “global player” with 84% of its sales generated by international activities. The ALTANA Group has four divisions: BYK Additives & Instruments, ECKART Effect Pigments, ELANTAS Electrical Insulation, and ACTEGA Coatings & Sealants. All of these divisions occupy a leading position in their target markets with respect to quality, product solution expertise, innovation and service.

ALTANA offers innovative, environmentally compatible solutions with the matching specialty products for coating manufactures, paint and plastic processors, the printing and cosmetic industries, and the electrical and electronic industry. The product range includes additives, special coatings and adhesives, effect pigments, sealants and compounds, impregnating resins & varnishes, and testing and measuring instruments.

At present, the ALTANA Group has 35 production facilities and 47 service and research laboratories worldwide. Throughout the group 4,800 people work to ensure the success of ALTANA worldwide. In 2009 ALTANA achieved sales of about 1.2 billion euros. Its impressive earning power and high growth rate make ALTANA one of the most successful and innovative chemical groups worldwide.