Lone Pine Capital LLC and its subsidiaries hold 5.442% of Sonova Holding AG

Stäfa (Switzerland), 06.04.2011 - According to the article 20 of the Swiss Stock Exchange Act, Sonova Holding AG announces that Lone Pine Capital LLC and its subsidiaries¹, 2 Greenwich Plaza, Greenwich, 06830, Connecticut, USA, hold 3,596,371 registered shares with a par value of CHF 0.05 as of March 30, 2011 due to acquisition of securities. This corresponds to 5.442% of total capital and voting rights.

Contact person at Lone Pine Capital LLC: Jeffrey Wechselblatt, phone: +1 203 618 7826,
fax: +1 203 552 3826.

¹Subsidiaries of Lone Pine Capital LLC:

Lone Cypress, Ltd.

2 Greenwich Plaza, Greenwich, Connecticut 06830

United States of America

Lone Spruce, L.P.

2 Greenwich Plaza, Greenwich, Connecticut 06830

United States of America

Lone Balsam, L.P.

2 Greenwich Plaza, Greenwich, Connecticut 06830

United States of America

Lone Sequoia, L.P.

2 Greenwich Plaza, Greenwich, Connecticut 06830

United States of America

Lone Kauri, Ltd.

2 Greenwich Plaza, Greenwich, Connecticut 06830

United States of America

Lone Cascade, L.P.

2 Greenwich Plaza, Greenwich, Connecticut 06830

United States of America

Lone Monterey Master Fund, Ltd.

2 Greenwich Plaza, Greenwich, Connecticut 06830

United States of America

Lone Sierra, L.P.

2 Greenwich Plaza, Greenwich, Connecticut 06830

United States of America

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