Disclosure of shareholdings

7/17/2007, 5:30 PM (Source: GlobeNewswire)
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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 13,
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 10, 2007, Deutsche Bank
Securities Inc., New York, also holds shares in BB BIOTECH AG; 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 GmbH,
Mainzer Landstr. 178-190, 60327 Frankfurt am Main
* Deutsche Bank Securities Inc., 60 Wall Street, New York,
NY 10005-2858

As at July 10, 2007 this Group held a total of 6.53% of voting
rights. The voting rights comprise 1 213 071 bearer shares (5.08%),
211 112 voting rights from 2 200 000 long call warrants (0.88%) and
137 206 voting rights arising from 2 252 241 short put options
(0.57%).

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



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BB BIOTECH AG
Vordergasse 3 Schaffhausen Switzerland

WKN: 888509;
ISIN: CH0001441580; Index: SBIOM, IGSP, SLIFE;
Listed: Investment Companies in SWX Swiss Exchange;
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