BPA Worldwide is an American company that provides independent, third-party audits of audience claims of business-to-business and consumer magazines. It also provides audit services for newspapers, web sites, events, email newsletters, digital magazines and other advertiser-supported media produced by its members. The company is a not-for-profit, (501(c)(6) organization, and is the largest auditor of media in the world in terms of membership, which consists of media owners, marketer companies and advertising agencies. BPA is similar to Alliance for Audited Media, providing independent, third-party verified data that media owners provide to media buyers and advertisers.