PRESS RELEASE: Director's Dealings announcement according to §15a WpHG (the German Securities Trading Act)

BB Biotech AG / Director's Dealings announcement according to §15a WpHG (the German Securities Trading Act) . Processed and transmitted by Thomson Reuters ONE. 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 AG

=------------------------------------------------------------------------------- Details of the transaction =------------------------------------------------------------------------------- Type of transaction: Buy

Date: 21.02.2013

Place (stock exchange): SIX Swiss Exchange

Price: 96.85

Currency: CHF

Quantity: 200

Business volume: 19370

=------------------------------------------------------------------------------- Details of the company with the publishing obligation: =------------------------------------------------------------------------------- Issuer:

BB Biotech AG

Vordergasse 3

CH-8200 Schaffhausen

Switzerland

ISIN: CH0038389992

WKN: 888509

This announcement is distributed by Thomson Reuters on behalf of Thomson Reuters clients. The owner of this announcement warrants that: (i) the releases contained herein are protected by copyright and other applicable laws; and (ii) they are solely responsible for the content, accuracy and originality of the information contained therein.

Source: BB Biotech AG via Thomson Reuters ONE [HUG#1680881]

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BB Biotech AG Vordergasse 3 Schaffhausen Switzerland

WKN: 888509;ISIN: CH0038389992;Index:TecDAX,MIDCAP,Prime All Share,TECH All Share,HDAX; Listed: Regulierter Markt in Frankfurter Wertpapierbörse;

http://www.bbbiotech.com (END) Dow Jones Newswires

   February 25, 2013 11:41 ET (16:41 GMT)- - 11 41 AM EST 02-25-13