The electronics giant uses CHI & Partners, Beattie McGuinness Bungay and Grey to produce its UK advertising. Mikah Martin-Cruz, Samsung's UK marketing director, is spearheading the consolidation process, despite extending the roster to include Grey earlier this year.
Samsung currently splits its £23 million UK media spend, with around half on campaigns created by global agencies and half on work by its UK shops.
The consolidation will not affect the company's global arrangements, with Leo Burnett Chicago and Cheil, which is part-owned by Samsung, remaining its agencies of record.
BMB and CHI have also produced global work for the handset manufacturer.
The move to consolidate follows Cheil's acquisition of a 49 per cent stake in BMB last year.