Söderströms Förlags Ab is a Finnish Swedish-language publishing company, founded in 1891 by publisher Werner Söderström.
In 1891 he decided to divide his Swedish- and Finnish-language publishing activities between two corporations.
[2] The Finnish part became Werner Söderströms (commonly referred to as WSOY) while the Swedish part was sold to Förlags AB Söderström in order to allow him to concentrate on the Finnish publishing.
[3][4] It was one of the two major Swedish publishing houses in Finland, and after the merger the market was dominated by one company.
[5] WSOY, in turn, was acquired by Sanoma in 1999 and later sold to Bonnier Group in 2011.