MFS Investment Management and its subsidiaries control 10.49% of Sonova Holding AG

Staefa (Switzerland), April 30, 2013 - According to the article 20 of the Swiss Stock Exchange Act, Sonova Holding AG announces that MFS Investment Management and its subsidiaries¹, 111 Huntington Ave, Boston, MA 02199, USA, control 6,981,946 registered shares with a par value of CHF 0.05 as of April 25, 2013 due to an acquisition of shares. This corresponds to 10.49% of total Sonova share capital.

¹Subsidiaries of MFS Investment Management:

MFS Investment Management ("MFS") - 111 Huntington Ave, Boston, MA 02199, USA

MFS Heritage Trust Co. ("MFSHE") - 111 Huntington Ave, Boston, MA 02199, USA

MFS Institutional Advisors, Inc. ("MFSI") - 111 Huntington Ave, Boston, MA 02199, 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. 76 467

MFS McLean Budden Limited (“MBL”) – 145 King Street West, Suite 2525, Toronto, Ontario, Canada M5H 1J8

The address for all the entities listed above is:

c/o MFS Investment Management, 111 Huntington Ave, Boston, MA 02199, USA

Contact person at MFS Investment Management:

Robert Flaherty, phone: +1 617 954 5814

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