** Shares in Swiss hearing aid maker Sonova SOON.S are seen down 2.9% in pre-market trade after its earnings missed expectations due to negative currency effects
** Sonova's earnings before interest, taxes and amortisation (EBITA), normalised for non-recurring items, came in at 316.1 million Swiss francs, 5% below analysts forecast
** "Margins were under pressure due to strong FX headwinds but most importantly, outlook was confirmed," Vontobel says
(Reporting by Anastasiia Kozlova, Amir Orusov)
((Anastasiia.Kozlova@thomsonreuters.com))