FTC and 22 states sue Amazon over alleged secret ad surcharge scheme
Amazon Faces Multi-Billion-Dollar Ad Auction Fraud Suit from FTC and Two-Dozen States
Wertynews.com – In what amounts to one of the largest consumer-protection actions ever brought against a major technology platform, the Federal Trade Commission joined forces with the attorneys general of 22 states on Monday to file a lawsuit accusing Amazon of quietly overcharging advertisers in its sponsored-product search auctions for roughly seven years. The complaint alleges that the e-commerce giant embedded undisclosed surcharges into its bidding system, inflating what more than one million brands and sellers paid to place ads on the platform and, in turn, pushing tens of billions of dollars in excess costs down to everyday shoppers.
The states participating alongside the FTC include Alaska, Arizona, California, Colorado, Florida, Idaho, Illinois, Indiana, Iowa, Kentucky, Louisiana, Maryland, Nebraska, New Jersey, New York, North Carolina, Oklahoma, Pennsylvania, Rhode Island, South Carolina, Vermont, and Washington — a coalition spanning coast-to-coast jurisdictions and representing a combined population well over half the country.
How Second-Price Auctions Are Supposed to Work
To understand the allegation, it helps to understand the mechanism at issue. Digital advertising platforms typically allocate keyword ad slots through what is called a second-price auction: the advertiser who bids the highest wins the placement, but pays only a nominal increment — conventionally one cent above — the amount the next-highest bidder offered. This structure, inherited from the Vickrey auction model in economics, is designed to encourage truthful bidding because a winner never pays more than the true market-clearing price. It is the standard mechanism used across Google, Meta, and virtually every major ad-tech marketplace.
Amazon told its advertising clients that this exact rule governed its sponsored-product placements. Sellers were led to believe they would pay just one cent above the runner-up bid for each keyword impression. The FTC complaint, however, contends that in approximately 80 percent of auctions, the company actually charged the winner its own full bid amount — effectively converting a second-price mechanism into a first-price one without informing participants. Over seven years and across millions of advertisers, the cumulative effect, the regulators allege, reached into the tens of billions of dollars.
Regulators Frame the Harm as Consumer-Level
The complaint does not frame the overcharges as a problem confined to brand marketers. Regulators argue that inflated advertising costs were largely passed through into product prices, meaning the ultimate financial burden landed on American consumers buying goods on Amazon's marketplace.
"When one of the world's largest online retailers engages in unfair and deceptive conduct, the impact can be staggering," FTC Chairman Andrew N. Ferguson said in a statement. "Amazon has millions of advertising customers who were misled into paying significantly higher prices. These higher costs were largely passed on to American consumers."
Amazon Disputes the Premise
The company responded swiftly, labeling the suit "misguided" and pointing to its own data showing that average winning bids for sponsored product ads fell by roughly 50 percent between 2019 and 2025. Amazon argued that the FTC's theory of harm ignores how advertisers actually behave in dynamic markets.
"The FTC's claim fundamentally misunderstands how advertisers operate," the company said in a statement. "Advertisers adjust bids based on real-world performance, not descriptions of auction mechanics."
Amazon went further, asserting that even if one accepts the regulators' assumption that advertisers never recalibrated their bids, the company's emphasis on ad relevance rather than pure bid-price selection saved advertisers more than $8 billion between 2021 and 2025.
Internal Documents Suggest Deliberate Concealment
The complaint leans heavily on internal Amazon communications to argue that the surcharge was not an accidental byproduct of auction engineering but a conscious, managed practice. Documents cited in the filing indicate that employees understood advertisers were calibrating their bids under the assumption of a genuine second-price auction. One Amazon executive, quoted in the complaint, described discussions about raising hidden charges while "hoping that advertisers don't notice and decrease bids or ad spend."
North Carolina Attorney General Jeff Jackson told reporters that Amazon allegedly ran tests to determine how large the concealed markup could grow before advertisers detected the anomaly and adjusted their behavior downward.
"Amazon takes great pains to actively conceal from customers the fact that it inflates its purported auction prices," the lawsuit alleged. "As Amazon's confidence that its advertising customers are unaware of its conduct has grown, it has substantially increased its hidden surcharges."
What the Plaintiffs Are Asking a Court to Order
New York Attorney General Letitia James outlined the relief sought: a permanent injunction barring Amazon from continuing what the complaint characterizes as an "illegal scheme," coupled with monetary penalties, restitution to affected advertisers, and additional damages. If granted, such an order would represent one of the most sweeping structural remedies imposed on a major platform's advertising operations to date.
Why the Case Matters Beyond Amazon
The suit lands at a moment when digital advertising has become the dominant revenue engine for most large technology companies and when regulators across multiple agencies have signaled heightened scrutiny of auction mechanics, data-driven pricing, and platform self-dealing. A finding that a second-price auction was quietly converted into a first-price mechanism — and that the switch was tested, scaled, and concealed — would set a precedent affecting how every ad marketplace structures and discloses its bidding rules. For the more than one million brands and sellers that depend on Amazon's advertising platform to reach customers, the outcome will determine whether they receive refunds for years of alleged overpayment, and it will shape the transparency obligations imposed on auction-based ad sales going forward.
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