Nielsen Holdings Plc (formerly known as Nielsen N.V.) is an American information, data and measurement firm. Nielsen operates in over 100 countries and employs approximately 44,000 people worldwide. Total revenues were $6.2 billion in 2016. The company is listed on the New York Stock Exchange (NYSE) and is currently a component of the S&P 500. In 2018, American Marketing Association ranked Nielsen number 1 among the top 50 Market Research Firms in the United States.