Illinois and Connecticut-based Cannondale is a specialist in category management, trade promotion, channel development and frequent shipper data analysis and has clients across the manufacturing, retail, financial services and pharmaceutical sectors.
Its unaudited revenues for 2003 were $8.6m.
This latest addition to Kantar's business comes just weeks after it announced the acquisition of Chinese market research firm Oracle.
Market research is seen as a key area of growth for WPP and last year former Saatchi & Saatchi chief executive Tamara Ingram was named president of three Kantar insight companies.
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