Werner Söderström Osakeyhtiö
Werner Söderström Osakeyhtiö (WSOY for short) is a Finnish publishing company founded in 1878 by Werner Söderström. From 1999 to 2011, the company was a part of the then newly merged Sanoma. But since Sanoma's demerger, WSOY is a part of Bonnier Group, a Swedish media conglomerate.
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