O&M, which has handled the brand in North America since 2003, will take over the business at the beginning of 2006.
Lowe handles the £6.5 million business in the UK and most of Europe.
Its ads encourage consumers to serve themselves "big dollops" of the product.
This move comes just weeks after Unilever announced a pan-European review of its £20 million Knorr account, shared by JWT and DDB.
Unilever and Lowe denied the move.
- Comment, page 48.