FTC alleges Amazon charged hidden auction surcharges costing brands billions

The U.S. Federal Trade Commission (FTC) has alleged that Amazon's Sponsored Products advertising system violates antitrust law through the use of hidden auction surcharges. According to the FTC, Amazon embedded undisclosed fees into its ad auction mechanism, extracting billions of dollars in excess charges from sellers and brands. Internal documents reviewed by regulators suggest Amazon was aware these practices could erode advertiser trust, yet the system continued operating unchanged.

Amazon's advertising marketplace has become the primary vehicle for e-commerce sellers to gain product visibility. Offerings such as Sponsored Products, Sponsored Brands, and Display Ads are now essential for sellers reaching customers. The FTC alleges that Amazon structured its auction system with non-transparent fees, effectively forcing sellers to bid higher to achieve the same ad placement. This approach has driven rapid growth in Amazon's advertising revenues but has done so through opaque mechanisms that obscure true campaign costs.

This case reflects broader regulatory pressure on Amazon's dual role as both a marketplace operator and a seller of its own brands. Regulators worldwide are intensifying scrutiny of major platform fee structures, data usage, and competitive conditions. Amazon has defended its advertising auction design and pricing model in response to FTC allegations.

For e-commerce sellers, this development underscores the increasing complexity of advertising budget planning and return-on-investment calculations. Transparency in marketplace advertising—particularly around fee structures and cost mechanics—forms the foundation of seller-platform relations. Similar investigations are underway at other major marketplaces, pushing sellers to scrutinize how their ad spend is deployed and which portion actually reaches targeted customers.