Unsealed FTC Complaint Reveals Alleged Amazon Advertising Auction Manipulation and Hidden Surcharge Schemes
The Federal Trade Commission (FTC) and a coalition of 22 state attorneys general have significantly expanded their legal assault on Amazon’s advertising practices, filing an updated complaint in the Western District of Washington that pulls back the curtain on how the e-commerce giant allegedly manipulated its search advertising auctions to inflate revenue. Newly unredacted court documents reveal that Amazon reportedly utilized "soft reserve" pricing mechanisms to secretly increase costs for advertisers, often pushing prices well beyond what the market would dictate through organic competition.
The allegations, which cover the period between 2021 and 2023, suggest a coordinated effort by Amazon to leverage its dominant market position to meet internal financial targets. According to the filing, these surcharges were not merely minor fluctuations in a dynamic marketplace but were instead calculated strategies to extract millions of dollars from both small businesses and major retailers during the most critical shopping periods of the year.
Chronology of the Legal Challenge
The roots of this legal battle trace back to August 2026, when the FTC and state partners first filed a sweeping antitrust lawsuit against Amazon, accusing the retailer of utilizing a "covert" pricing scheme to benefit its own logistics and retail operations while penalizing third-party sellers. While the initial filing provided a foundational argument regarding monopolistic behavior, the recent unsealing of previously redacted documents has provided a granular look at the specific mechanisms used to influence ad pricing.
Between 2021 and 2023, the period now under intense scrutiny, advertisers began to notice anomalous spikes in their cost-per-click (CPC) metrics. Throughout this timeframe, the FTC alleges that Amazon executives and product teams engaged in internal discussions regarding revenue gaps, explicitly identifying the advertising auction as a lever to generate additional capital. The latest disclosures indicate that these practices were not incidental; they were managed through internal directives to pull "all of the stops" to ensure the company met its corporate financial planning goals.
The Mechanism of Alleged Price Inflation
Central to the FTC’s argument is the implementation of "soft reserve" prices. In a standard digital advertising auction, the cost per click is typically determined by the second-price auction model, where the winning bidder pays one cent more than the runner-up. Amazon’s use of a "soft reserve" allegedly altered this dynamic. By setting a reserve price higher than what was necessary to clear the auction, Amazon could force advertisers to pay significantly more than their competitors’ bids.
The data provided in the unsealed complaint is striking. On average, non-peak shopping days saw ad prices inflated by up to 50% above the true auction result. However, during high-traffic events such as Prime Day and Black Friday—when advertisers are most reliant on Amazon’s search visibility—the alleged surcharges skyrocketed to as much as 250%.
The complaint cites an internal email from the head of Amazon Ads to the senior vice president of ad products and technology. The executive explicitly requested that the team prioritize "reserves" to help close a $40 million revenue shortfall, noting that the goal was to achieve this without resorting to "unnatural acts." Critics and legal experts argue that this internal framing highlights a conscious decision to prioritize revenue extraction over the transparency and efficiency of the marketplace.
The Communication Gap and Advertiser Skepticism
Perhaps the most damaging aspect of the unredacted complaint involves how Amazon representatives addressed concerns from advertisers. When users of the platform noticed abnormal cost spikes, they frequently reached out to account managers to investigate potential bugs or technical shifts in the auction algorithm.
In one documented instance, an advertiser inquired if there had been a fundamental change to the second-price auction process. The response provided by an Amazon account manager was categorical: the team had consulted with product specialists and confirmed that there were no bugs or changes to the auction style. Instead, the account manager attributed the surging costs to increased competition and a "more crowded" marketplace.
The FTC asserts that this response was intentionally misleading. By shifting the blame to the external market environment, Amazon allegedly maintained the illusion of a fair, competitive auction while continuing to apply the undisclosed surcharges. This dynamic raises critical questions about the fiduciary responsibility of a platform that acts as both the marketplace operator and the auction house manager.
Broader Economic and Industry Implications
For the thousands of businesses that rely on Amazon for their digital advertising spend, these findings necessitate a rigorous audit of historical performance data. If the allegations are proven true, the return on ad spend (ROAS) reported by brands during 2021–2023 may have been artificially deflated by these surcharges, leading to suboptimal business decisions.
From an industry perspective, the litigation underscores the growing tension between major digital platforms and the regulators overseeing them. As advertising budgets continue to shift toward retail media networks, the transparency of these "black box" auctions becomes a matter of significant economic interest. Should the court find in favor of the FTC, it could set a precedent for how retail media platforms must disclose their pricing algorithms and the extent to which they can influence auction outcomes to meet internal revenue quotas.
Amazon’s Defense and Ongoing Litigation
Amazon has consistently denied that its practices are deceptive or harmful. In previous responses to the lawsuit, the company has defended the use of reserve pricing, asserting that it is a standard industry practice designed to ensure ad quality and relevance. The company maintains that advertisers never pay more than their maximum bid, framing the reserve price as a mechanism to prevent low-value ads from winning placements.
However, the new evidence directly challenges the assertion that these reserves were purely for quality control. By linking the surcharges to specific revenue targets rather than performance or relevance metrics, the FTC has built a case that shifts the narrative from technical optimization to potential market manipulation.
As the litigation continues into its next phase, industry analysts expect more documents to be unsealed, potentially covering the 2024 period and encompassing a wider array of ad formats, including Sponsored Products, Sponsored Brands, and Display Ads. For now, the legal community and the advertising industry remain in a state of heightened watchfulness.
Recommendations for Advertisers
While the litigation unfolds, media buying teams are advised to take a more cautious approach to historical performance analysis. Advertisers should consider the following steps:
- Performance Benchmarking: Re-evaluate historical campaign performance from 2021–2023 with the understanding that cost-per-click metrics may have been influenced by factors outside of organic bidding competition.
- Diversification: Assess the reliance on Amazon as a sole advertising channel to mitigate risks associated with platform-controlled auction volatility.
- Internal Documentation: Maintain rigorous records of communication with account representatives, particularly regarding sudden shifts in ad performance or cost efficiency.
- Monitoring Legal Filings: Keep a close watch on future court filings, as the FTC may provide further guidance on which specific ad formats and timeframes were most impacted by the alleged practices.
The outcome of this case will likely have far-reaching implications for the retail media landscape. Whether the court determines that Amazon’s actions were a clever use of market power or a violation of antitrust and consumer protection laws, the transparency of retail ad auctions is now firmly at the center of a national regulatory debate. As the case proceeds, the industry will be forced to grapple with the reality that the "invisible hand" of the digital auction might, in some instances, be guided by the very platform that benefits from it.
