Identify and compile a list of the top 10 marketing research companies worldwide.

Explanation:

According to my research on market research companies, I can say that based on the information provided within the question the top 10 marketing research companies worldwide are the following:

These are the top 10 in the world in order by yearly revenue, with Nielsen leading with a yearly revenue of roughly $6.3 billion and Dunnhumby at position #10 with $429 million.

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could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )