FTC sues Amazon over ad auctions

What's happened

The FTC and 22 states have filed a federal lawsuit alleging Amazon has secretly inflated prices in its ad auctions since 2019 by inserting a "soft reserve" bid, extracting about $20bn from roughly 1.2 million advertisers and passing higher costs to shoppers. Amazon has called the suit "misguided" and denied it harmed advertisers or consumers.

What's behind the headline?

What the complaint says

• The FTC has alleged Amazon used a "soft reserve" — an undisclosed synthetic bid — to raise final auction prices for Sponsored Products, Sponsored Brands and Sponsored Display ads since about 2019. The agency says internal documents show Amazon calculated a proxy second price rather than relying on the next-highest bidder.

Who stands to lose and who stands to gain

• Advertisers have likely paid more: the complaint claims Amazon extracted roughly $20bn from about 1.2 million advertisers. Regulators say some higher costs were passed on to shoppers. Amazon denies advertisers or consumers were harmed.

Why this matters now

• This is the FTC's most recent major action against Amazon after prior cases over Prime enrollments and alleged monopoly practices. The agency is pursuing an injunction, penalties and disgorgement; states are seeking similar relief.

Likely legal and market consequences

• The case will force Amazon to disclose auction mechanics if regulators win and will increase pressure on platforms to provide independent measurement. Defeat for Amazon will prompt advertisers to demand refunds and tighter contractual protections; a victory for Amazon will leave industry auction practices largely intact.

Forecast

• The litigation will be lengthy. Expect aggressive discovery and public testimony from former employees; advertisers will press for settlements and clearer contractual terms. Regulators will use findings here to press other platforms on ad-auction transparency.

What advertisers should do

• Advertisers should audit past spend on the named ad products, seek statements from Amazon about exposure, and accelerate independent measurement and verification of platform performance.

How we got here

The FTC opened its probe in 2024 and has now joined 22 state attorneys general in a complaint filed in the Western District of Washington. The suit targets Sponsored Products, Sponsored Brands and Sponsored Display auctions and cites internal documents and training materials.

Our analysis

The coverage shows two clear threads. The FTC's case relies on internal documents and a detailed, 181‑page complaint: Ars Technica reports the complaint claims Amazon "overrides and replaces the actual auction results with higher prices set by Amazon" and quotes the suit saying the company used an "invented auction participant" — a point the FTC emphasises to show systematic deception. The New York Times and AP repeat the FTC's headline allegation that millions of advertisers were misled; AP quotes FTC Chair Andrew Ferguson saying the impact "can be staggering." Amazon's rebuttal is consistent across outlets. Business Insider UK quotes Amazon's statement calling the suit "misguided," arguing the FTC has "cherry-picked" simplified examples and emphasising that the company prioritises ad relevancy over bid amount. The Independent and BBC record Amazon's claim that advertisers adjust bids based on performance and that Amazon's disclosures contradict the FTC's framing; the Independent includes Amazon's estimate that prioritising relevancy "saved over $8bn from 2021 to 2025." Different outlets stress different consequences. Bloomberg and BBC highlight the alleged $20bn figure; the Independent and Guardian underline the states' involvement and potential consumer harm. Business Insider focuses on practical marketer advice from consultants who urge CMOs to audit exposure and double down on independent measurement. Those practical takeaways make the story immediately relevant to advertisers while the legal accounts frame the broader regulatory stakes.

Go deeper

• How will Amazon’s defence try to rebut internal-document evidence?
• What specific ad products and date ranges should advertisers audit first?

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