*

Hitt og þetta 19. júlí 2007

Disclosure of shareholdings

Pursuant to Art. 20 of the Swiss Federal Act on Stock Exchanges and Securities Trading - BEHG, Deutsche Bank AG, Frankfurt, informed BB BIOTECH AG, Vordergasse 3, 8200 Schaffhausen, Switzerland on July 17, 2007 of a change in the group of persons in accordance with Article 15 par. 5 of the Stock Exchange and Securities Trading Ordinance of the Federal Banking Commission. Since July 12, 2007, Deutsche Bank Securities Inc., New York, does not hold any shares in BB BIOTECH AG anymore; the Group member companies now comprise the following: * Deutsche Bank AG Frankfurt, Taunusanlage 12, 60325 Frankfurt/Main * Deutsche Bank AG, London Branch, Winchester House, 1 Great Winchester Street, EC2N 2DB London * Deutsche Asset Management Investmentgesellschaft mbH, Mainzer Landstr. 178-190, 60327 Frankfurt am Main As at July 12, 2007 this Group held a total of 6.52% of voting rights. The voting rights comprise 1 205 910 bearer shares (5.05%), 211 112 voting rights from 1 200 000 long call warrants (0.88%) and 140 005 voting rights arising from 2 256 241 short put options (0.59%). For further information please contact: Bellevue Asset Management AG, Seestrasse 16, 8700 Küsnacht, Switzerland Adrian Bruengger or Dr. Christian Lach, Tel. +41 44 267 67 00 --- End of Message --- BB BIOTECH AG Vordergasse 3 Schaffhausen Switzerland WKN: 888509; ISIN: CH0001441580; Index: SBIOM, IGSP, SLIFE; Listed: Investment Companies in SWX Swiss Exchange;