The Federal Trade Commission and 22 state attorneys general have publicly released additional, previously redacted allegations in their enforcement case against Amazon, offering a more detailed look at claims that the company manipulated advertising auctions and drove up prices paid by advertisers. The newly visible allegations sharpen the factual contours of one of the most consequential antitrust and unfair-practices cases now pending against a major technology platform.

According to the agencies, Amazon’s ad-auction practices did more than affect internal marketplace mechanics: they allegedly distorted pricing in a way that harmed advertisers purchasing access to consumers on Amazon’s platform.