Sonova Holding AG - Disclosure of shareholdings

According to the article 20 of the Swiss Stock Exchange Act, Sonova Holding AG announces that MFS Investment Management and its subsidiaries¹, 500 Boylston St., Boston, MA 02110, hold 3.19% of total capital and voting rights as of October 13, 2010 due to acquisition of shares.

Contact person at MFS Investment Management: Robert Flaherty, phone: +1 617 954 5814, fax: +1 617 350 2574.

¹ Subsidiaries of MFS Investment Management:

MFS Investment Management ("MFS")

MFS Institutional Advisors, Inc. ("MFSI")

MFS International Ltd. ("MIL")

MFS International ("UK") Ltd. ("MIL UK")

MFS Heritage Trust Co. ("MFSHE")

MFS International Management KK ("MIM KK")

MFS International Management ("LUX") S.A. ("MIM LUX")

The address for all the entities listed above is:

c/o MFS Investment Management, 500 Boylston St., Boston, MA 02110

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