Need to know who's buying what in Europe? Check with GfK. One of Europe's largest market research firms (and #4 worldwide), GfK (Growth from Knowledge) tracks consumers' tastes in and purchases of grocery and nonfood items, broadcast media, pharmaceuticals, and other merchandise and services worldwide. GfK SE serves automotive, consumer goods, fashion and lifestyle, financial services, health, media and entertainment, public services, retail, technology, and travel and tourism industries. Its businesses include GfK NOP, GfK MRI, and GfK Healthcare. The research company traces its roots to 1934. In 2013, GfK's consumer service sector contributed more than 50% of sales.