Disclosure pursuant to article 26 sec 1 clause 2 WpHG (own shares) as at November 7, 2013

Disclosure of shareholding

Pursuant to article 26 sec 1 clause 2 WpHG, BB Biotech AG, Schaffhausen, Switzerland, herby reports that it increased its holding in own shares to more than 3% of the proportion of voting rights as of November 5, 2013 (a total of 356 639 shares / 3.01% of the proportion of voting rights).

Thereof, 0.27% of the proportion of voting rights (a total of 31 639 shares) are held through its wholly-owned subsidiary Biotech Target N.V., Curaçao.

For further information: Bellevue Asset Management AG, Seestrasse 16, 8700 Küsnacht / Zürich
Tanja Chicherio, Tel. +41 44 267 67 00.

Schaffhausen, November 7, 2013
BB Biotech AG

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Source: BB Biotech AG via Thomson Reuters ONE

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