Investigation of Sonova Holding Ltd

5 May 2011

SIX Exchange Regulation opens an investigation of Sonova Holding Ltd on the grounds of possible breaches of the rules governing ad hoc publicity.

Having finished its preliminary investigation SIX Exchange Regulation, which is charged by SIX Swiss Exchange Ltd with the monitoring and enforcement of issuer obligations, has opened an actual investigation of Sonova Holding Ltd on the grounds of possible breaches of the obligations regarding ad hoc publicity. The investigation is connected with the profit warning which the company published on 16 March 2011.

Investigatory proceedings will continue for an indefinite period. SIX Exchange Regulation will announce the findings, although no information will be provided while the investigatory proceedings are ongoing.

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