Key Points:
- The Federal Trade Commission and more than 20 state attorneys general are preparing a major lawsuit against Amazon over deceptive ad pricing practices.
- Regulators allege Amazon manipulated search advertising auctions over a seven-year period to secretly raise costs for merchant advertisers.
- The company allegedly used a hidden “soft reserve” bidding mechanism in 70% to 80% of auctions, driving up pay-per-click rates by up to 50%.
- Amazon generated $68 billion in digital advertising revenue in 2025, making the high-margin ad business a crucial driver of overall corporate profit.
The Federal Trade Commission is preparing to file a comprehensive lawsuit against Amazon in a Seattle federal court, accusing the online retail giant of manipulating its advertising auction system. A bipartisan group of more than 20 state attorneys general, including top law enforcement officials from New York, California, and Florida, plans to join the federal action. Following reports of the impending litigation, Amazon shares slid 2.8% as financial markets evaluated the potential impact on the company’s most lucrative business segment.
Regulators allege that Amazon systematically misled thousands of third-party merchants and brand advertisers over a seven-year period beginning in 2018. According to the investigation, the company quietly altered the algorithms governing its digital ad auctions to inflate the prices sellers paid for sponsored search visibility. Because merchants rely on sponsored listings to reach online shoppers, the covert pricing changes forced businesses to spend billions of dollars in extra marketing costs to maintain their sales rankings.
Under standard second-price auction rules, the winning bidder pays a small increment above the second-highest bid submitted by a competitor. However, regulators found that Amazon used its proprietary access to competing merchant bids to insert automated shadow bids into live auctions. Known internally as a “soft reserve” tactic, this practice allowed Amazon to bid against its own sellers, artificially driving final clearing prices well above the true runner-up bid while pocketing the difference.
Amazon selectively triggered this mechanism during peak shopping seasons, including Prime Day, Black Friday, and Cyber Monday. By deploying shadow bidding during periods of heavy consumer traffic, the company led merchants to believe that rising advertising costs reflected organic competition among rival sellers. Internal company communications reveal that advertising managers tracked the additional revenue generated by these auction interventions while strictly limiting outside transparency regarding how the system set final clearing prices.
Over several years, the practice expanded from temporary holiday promotions into standard, year-round platform operations. Regulatory investigators found that Amazon intervened in 70% to 80% of digital search ad auctions in recent years. This continuous intervention drove pay-per-click rates up by as much as 50% during major promotional sales events. With digital advertising functioning as a virtual requirement for sellers seeking visibility among hundreds of millions of product listings, merchants had little choice but to absorb the rising expenses.
The impending lawsuit strikes at Amazon’s most profitable division. The company operates the third-largest digital advertising business in the world, trailing only Alphabet and Meta Platforms. In 2025, Amazon generated $68 billion from advertising services, representing one of its fastest-growing and highest-margin operations. Unlike physical retail fulfillment, which carries substantial warehouse and logistics costs, digital advertising delivers exceptional margins that help finance investments across cloud computing, logistics networks, and artificial intelligence development.
Independent merchants frequently passed these inflated advertising costs directly to retail consumers in the form of higher product prices. Because advertising expenses represent a major line item for e-commerce sellers, businesses increased retail prices across various categories to protect their operational margins. Regulators argue that Amazon’s auction manipulations created an artificial pricing floor across the marketplace, raising the cost of everyday consumer goods, electronics, and household essentials for millions of online shoppers.
More than 20 state attorneys general are joining the legal action, giving prosecutors substantial enforcement power under state consumer protection statutes. While federal claims seek injunctions to end deceptive practices, state unfair-trade laws allow attorneys general to pursue substantial civil penalties and financial restitution for affected merchants operating within their states. A combined federal and state lawsuit significantly expands Amazon’s potential financial exposure and could result in court-mandated overhauls of its auction architecture.
This legal challenge adds to a growing wave of regulatory actions targeting Amazon’s business practices. The company previously agreed to a $2.5 billion settlement with the FTC over deceptive subscription enrollment and cancellation procedures for its Prime membership service, paying $1.5 billion in consumer refunds alongside a $1 billion penalty. Amazon also continues to defend itself against a broad antitrust lawsuit alleging that the company maintains an illegal e-commerce monopoly by penalizing sellers who offer lower prices on competing retail sites.
The outcome of this case will set major precedents for algorithmic transparency and pricing practices across the fast-growing retail media sector. As major retailers launch proprietary ad platforms, regulatory authorities are signaling that hidden reserve bidding and algorithmic price manipulation violate federal consumer protection laws. The litigation will require Amazon to defend its auction software in court, potentially opening its advertising algorithms to independent oversight and restoring competitive bidding fairness for online merchants.
