Directors' dealings:BB Biotech AG:Director's Dealings announcement according to §15a WpHG (the German Securities Trading Act)

1 april 2010 BB Biotech AG / / Director's Dealings announcement according to §15a WpHG (the German Securities Trading Act) processed and transmitted by Hugin AS. The issuer is solely responsible for the content of this announcement. -------------------------------------------------------------------------------- Details of the person subject to the disclosure requirement -------------------------------------------------------------------------------- Name: Koller,  Daniel Professional role: Person with executive functions:   Member of a managing body -------------------------------------------------------------------------------- Designation of the financial instrument -------------------------------------------------------------------------------- ISIN: CH0038389992 Designation: Registered share BB Biotech -------------------------------------------------------------------------------- Details of the transaction -------------------------------------------------------------------------------- Type of transaction: Buy Date: 30.03.2010 Place (stock exchange): SIX Swiss Exchange, Zurich Price: 73.25 Currency: CHF Quantity: 5000 Business volume: 366250 -------------------------------------------------------------------------------- Details of the company with the publishing obligation: -------------------------------------------------------------------------------- Issuer: BB Biotech AG Vordergasse 3 CH-8200   Schaffhausen Switzerland ISIN: CH0038389992 [HUG#1400357] --- End of Message --- BB Biotech AG Vordergasse 3 Schaffhausen Switzerland WKN: 888509;ISIN: CH0038389992;Index:TECH All Share,MIDCAP,HDAX,Prime All Share,TecDAX; Listed: Regulierter Markt in Frankfurter Wertpapierbörse;