From the Wall Street Journal – Market researcher Taylor Nelson Sofres agreed Monday to be acquired by WPP Group for £1.1 billion ($1.95 billion).
With this acquisition WPP becomes the world’s largest marketing company overtaking Omnicom Group.
According to the WSJ: “Many research products, such as television ratings and retail market-share data, typically continue selling well even when advertising demand slackens.”
Now the top six market research firms worldwide and their revenues, in billions are:
Top 6 Market Research Firms
Nielsen $4.7
Kantar (WPP) / Taylor Nelson Sofres $4.0
IMS $2.2
GfK $1.6
Ipsos $1.3
Synovate $0.9
Search Marketing Communications 
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