a4 advertising is an advanced advertising and data company that provides audience-based, multiscreen advertising solutions to ... local, regional and national businesses and advertising clients. a4 enables advertisers to reach more than 90 million U.S. households on television through cable networks, on-demand and addressable inventory across the U.S., and more than 45 million U.S. households through authenticated, privacy-compliant IP addressability supported by rich data sets and powerful analytics and attribution services in a simple, user-friendly way. read more