FTC and 22 States Sue Amazon Over Ad Auction Practices

California Attorney General Rob Bonta announced the state's participation in a broad federal lawsuit that accuses Amazon of manipulating its advertising auctions for years, extracting an estimated tens of billions of dollars from more than one million brands and sellers. The action, filed by the Federal Trade Commission along with 22 states including California, claims the e-commerce giant misled advertisers about how it priced sponsored placements, ultimately driving up costs that were passed along to shoppers.

The complaint, lodged in federal court in Washington state, details how Amazon allegedly converted what it presented as a second-price auction system into a first-price model without disclosure. Advertisers were told they would pay just one cent above the next highest bid, yet internal documents cited in the suit show the company charged the full winning bid in roughly 80 percent of cases for Sponsored Products ads. This practice ran for more than seven years and affected hundreds of thousands of small and medium-sized businesses that rely on the platform to reach customers.

Bonta stated that Amazon misrepresented its pricing calculations, rigging billions of auctions to boost its own profits while harming American sellers who use the service. Regulators estimate the undisclosed surcharges likely pulled more than 20 billion dollars from advertisers, with a significant portion of those added expenses passed on through higher product prices. The suit highlights how the scheme particularly burdened smaller competitors that lack the resources to negotiate or absorb such costs.

Amazon has rejected the allegations outright, describing the case as misguided and insisting that advertisers understood the auction mechanics. The company maintains that its Sponsored Ads tools provide clear value and that bidders always knew the rules governing final prices. Company statements emphasize ongoing investments in advertising transparency and dispute any claim that the system was designed to deceive users.

The lawsuit adds to a growing list of regulatory challenges facing Amazon over its marketplace dominance. Critics have long argued that the platform's control over both retail space and advertising creates inherent conflicts, allowing it to favor its own products while squeezing third-party sellers. Consumer advocates note that inflated ad costs contribute to the broader problem of rising prices on everyday goods sold through the site.

States ranging from Florida to Alaska joined the FTC in the filing, signaling broad bipartisan concern over the practices described. The complaint seeks injunctive relief to halt the alleged conduct and potential monetary remedies for affected advertisers. Legal observers expect Amazon to mount a vigorous defense, pointing to the complexity of auction systems and arguing that the claims rest on selective readings of internal communications.

For small businesses that built sales channels around Amazon's search results, the case underscores the risks of depending on a single platform whose rules can shift without clear notice. Regulators argue that the hidden surcharges distorted competition and reduced the efficiency of the advertising marketplace that millions of sellers treat as essential infrastructure.

The suit does not allege direct harm to Amazon shoppers but contends that the extracted revenue ultimately flowed into consumer prices. As the legal process moves forward, attention will focus on whether the evidence of internal documents can substantiate claims that the company knowingly misled participants in its ad auctions.