The company was founded in 1954 as
Svenska institutet för opinionsundersökningar ("the Swedish Institute for Opinion Surveys") and known by the public under the acronym Sifo. In 2000 the company was acquired by
WPP and renamed
Sifo Research International. After a merger with
TNS Gallup in 2009, the company was named TNS Sifo. Since 2016 the company is known as Kantar Sifo. ==References==