The NPD Group, Inc. (formerly National Purchase Diary) is a market research company. The NPD group operates in 20 countries, interviews 12 million consumers a year, and monitors consumer purchase data from over 165,000 stores. It ranks among the top 25 market research companies in the independent Honomichl Top 50 report. In 2013, NPD ranked as the 9th largest market research company in the world, according to this report.