Circana, formerly known as the NPD Group is an American market research company founded on September 28, 1966, and based in Port Washington, New York. In 2017, NPD ranked as the 8th largest market research company in the world, according to the... Wikipedia
Founded: September 28, 1966
Formerly: National Purchase Diary Panel Inc. (1966–1975); NPD Research Inc. (1975–1988)
Headquarters: Port Washington, New York, U.S
Parent organization: Circana, LLC
Subsidiary: BookScan