MFS Investment Management and its subsidiaries hold 5.26% of Sonova Holding AG

Stäfa (Switzerland), 29.03.2011– 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,USA hold 5.26% of total capital and voting rights as of March 23, 2011 due to acquisition of shares.

¹Subsidiaries of MFS Investment Management:

MFS Investment Management (“MFS”) – 500 Boylston St., Boston, MA 02110, USA

MFS Heritage Trust Co. (“MFSHE”) – 500 Boylston St., Boston, MA 02110, USA

MFS Institutional Advisors, Inc. (“MFSI”) – 500 Boylston St., Boston, MA 02110, USA

MFS International Ltd. (“MIL”) – Canons’s Court, 22 Victoria Street, Hamilton, HM12, Bermuda

MFS International (U.K.) Ltd. (“MIL UK”) – Paternoster House, 65 St.Paul’s Churchyard, London EC4M 8AB, UK

MFS Investment Management K.K. (“MIM KK”) – 16 F Daido Seimei Kasumigaseki building, 1-4-2 Kasumigaseki 1-Chome, Chiyoda-Ku, Tokyo 100-0013

MFS Investment Management (“LUX”) S.A. (“MIM LUX”) – 49, Avenue J.F. Kennedy, L-1855 Luxembourg, R.C.S. Luxembourg No. 76467

The address for all the entities listed above is:

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

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

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