PolyGram was the name of the major label recording company started by Philips as a holding company for its music interests in 1945. In 1999 it was sold to Seagram and merged into Universal Music Group.
Read more about PolyGram: Hollandsche Decca Distributie (HDD), 1929-1950, Philips Phonografische Industrie (PPI), 1950-1962, GPG and PolyGram, 1962-1980, Reorganization, 1980-1999