DOTTIKON ES Changes to Swiss GAAP FER as of April 1, 2018

Dottikon, Switzerland, October 11, 2017 – On October 10, 2017, the Board of Directors of DOT- TIKON ES HOLDING AG decided to change the accounting standard to Swiss GAAP FER, effective from April 1, 2018. The company will start reporting under the new accounting stan- dard beginning with its Half-Year Report 2018/19. The fundamental decision to change the accounting standard to Swiss GAAP FER was taken and published on July 7, 2017. DOTTIKON ES manufactures high-quality performance chemicals, intermediates and exclusive active pharmaceutical ingredients (APIs) for the world's leading chemical and pharmaceutical industry. The company with its production site in Dottikon (Aargau, Switzerland) is specialized in hazardous reactions and is positioning itself as strategic development and manufacturing partner. Its safety culture created over the last 100 years guides innovative use of hazardous reactions, low-temperature and high-pressure chemistry, as well as continuous processing. This shortens conventional chemical synthesis routes, increases yields, selectivities and purities, and reduces waste. The versatile technology and equipment portfolio is used to design, develop and optimize chemical processes, and scale up from kilograms to multi-tons. DOTTIKON ES' one-site strategy allows reduced decision and communication pathways. This ensures rapid and efficient project development as well as clear and transparent communication with customers.

DOTTIKON ES HOLDING AG is listed at the SIX Swiss Exchange. Symbol: DESN Security number: 2073900 ISIN: CH0020739006

For further information please contact Markus Blocher, Ph.D. CEO Dottikon ES Holding AG Tel +41 56 616 82 01 Fax +41 56 616 89 45 [email protected]