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MFS Investment Management and its subsidiaries hold 9.99% of Sonova Holding AG

Staefa (Switzerland), December 13, 2012 - 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 6,648,384 registered shares with a par value of CHF 0.05 as of December 6, 2012 due to sale of securities. This corresponds to 9.99% of total capital and voting rights.


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. 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, 500 Boylston St., Boston, MA 02110, USA


Contact person at MFS Investment Management:

Robert Flaherty, phone: +1 617 954 5814


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