| ACNielsen is a U.S. marketing research firm,
based in New York City. The company serves the consumer goods market with research on market performance and dynamics, solving marketing and sales problems, and identifying market growth opportunities.
The company was founded in 1923 by Arthur C. Nielsen, Sr. in order to give clients reliable and
objective information on the impact of marketing and sales programs.
ACNielsen began expanding internationally in 1939, and now operates in more than 100 countries.
One of ACNielsen's best-known products were the Nielsen Ratings,
which measure television,
radio and newspaper audiences. In 1996, ACNielsen split off this part of
its operations into a separate company called Nielsen Media
Research (NMR), which operated as an independent company until it was acquired by
Dutch conglomerate VNU in 1999.
In 2001, A C Nielsen itself was acquired by VNU, as
part of VNU's Marketing Information group, and thus is now under the same corporate umbrella as the company it spawned, NMR.
ACNielsen is also a sister company to Nielsen//NetRatings, which measures Internet and digital media audiences.
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