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Nielsen Holdings PLC (formerly known as Nielsen N.V.) is a global information, data and measurement company with headquarters in New York City, USA. Nielsen operates in over 100 countries and employs approximately 44,000 people worldwide. Total revenues were $6.2 billion in 2015.The company is listed on the New York Stock Exchange (NYSE) and is currently a component of the S&P 500. In 2016, American Marketing Association ranked Nielsen number 1 among top 50 Market Research Firms in the United States. Nielsen was founded in 1923 by Arthur C. Nielsen, Sr., who invented an approach to measuring competitive sales results that made the concept of "market share" a practical management tool.