Amazon faces intensified scrutiny as newly unsealed FTC documents allege systemic auction rigging in its advertising platform

The Federal Trade Commission (FTC), alongside a coalition of 22 state attorneys general, has escalated its legal challenge against Amazon, providing a detailed, behind-the-scenes look at how the e-commerce giant allegedly manipulated its advertising auctions to inflate costs for retailers. The updated complaint, filed in the U.S. District Court for the Western District of Washington, replaces previously redacted sections with explicit evidence suggesting that Amazon systematically increased the cost-per-click (CPC) for advertisers to meet internal corporate revenue targets.

The litigation, which originated from a broader antitrust lawsuit filed in August 2026, alleges that Amazon’s advertising apparatus—a critical revenue driver for the company—was not merely a competitive marketplace but a managed system where reserve pricing was adjusted to maximize corporate profit rather than reflect organic auction outcomes. The unsealed court filings reveal that these surcharges were not occasional anomalies but a strategic mechanism utilized to bridge gaps in Amazon’s financial performance.

A Chronology of the Alleged Surcharge Scheme

The timeline of these allegations centers on the 2021–2023 period, during which Amazon’s advertising division experienced explosive growth. According to the FTC, the practice of manipulating auction outcomes became particularly pronounced during high-traffic retail windows.

• 2021-2022: As Amazon consolidated its dominance in the retail media space, the FTC alleges that "soft reserve" pricing—a mechanism intended to establish a floor for bids—was increasingly decoupled from market demand and instead tethered to internal revenue mandates.
• Early 2023: Internal communication captured in the lawsuit shows Amazon leadership explicitly discussing the need to close financial gaps. A memo from the head of Amazon Ads to the senior vice president of ad products requested that reserve pricing be adjusted to generate at least $40 million in additional revenue to hit corporate targets.
• November 2026: Following a series of court-ordered disclosures, the FTC released unredacted versions of the complaint. This move provided the public and the advertising industry with the first concrete evidence of how price surcharges were communicated internally, contradicting the explanations provided to clients at the time.

Decoding the Mechanics of the Auction

At the heart of the controversy is the concept of "soft reserve prices." In a standard digital advertising auction, advertisers place bids for keyword placements or product displays. Usually, the price paid is determined by the next highest bid—a model known as a second-price auction. A "reserve price" is a legitimate industry standard meant to ensure that publishers do not sell inventory for less than a certain threshold.

However, the FTC contends that Amazon misused these reserves. By implementing undisclosed soft reserves, Amazon could effectively override the natural competitive outcome of the auction, forcing advertisers to pay higher CPCs than they would have in a transparent, competitive environment. The complaint asserts that Amazon’s internal systems allowed these reserves to trigger even when a competitor’s bid would have naturally dictated a lower price.

The financial impact cited in the filings is significant. On ordinary business days, the FTC alleges that prices were inflated by as much as 50% above what the auction results should have yielded. During peak shopping events, such as Prime Day or Black Friday, the alleged surcharge reached a staggering 250% over the baseline auction result.

The Discrepancy Between Public Stance and Internal Reality

Perhaps the most damning aspect of the unsealed documents is the evidence of how Amazon responded when advertisers became suspicious of sudden cost spikes. The court documents reveal instances where account managers, likely unaware of the internal surcharge policy or acting under corporate guidance, provided misleading explanations to clients.

In one documented case, an advertiser noticed a significant deviation in their campaign performance and inquired whether the "second price auction process" had been altered. The response provided by an Amazon representative cited the "crowded marketplace" and "high competition" as the drivers of the rising CPCs. The FTC alleges that this was a deliberate obfuscation, designed to maintain the integrity of the advertising product in the eyes of the vendors while the company was simultaneously pulling the levers to extract higher fees.

Corporate Defense and Market Response

Amazon has consistently denied the allegations of fraud or deception. In its initial responses to the litigation, the company argued that its auction processes are standard practice and that advertisers remain in control of their spending limits. Amazon’s legal team has emphasized that, regardless of reserve pricing, an advertiser never pays more than their maximum bid, and therefore, they are not being "overcharged" in a technical sense.

However, industry experts suggest that the distinction is philosophical. If an advertiser bids with the expectation that the market will determine the price, but the publisher artificially forces that price to the maximum bid through hidden reserves, the premise of the "auction" is compromised. For small-to-medium-sized enterprises (SMEs) operating on thin margins, these inflated costs can be the difference between a profitable campaign and a net loss.

Broader Implications for the Digital Advertising Industry

The case against Amazon is likely to set a legal precedent for how "retail media networks" are regulated. As e-commerce platforms increasingly rely on advertising revenue to pad their bottom lines, the transparency of their auction algorithms will become a focal point for antitrust regulators globally.

For media buyers, agencies, and brand managers, the revelations necessitate a fundamental shift in how historical performance data is analyzed. If a campaign from 2022 showed a sudden spike in CPC, the data might no longer be interpreted as a sign of high competition, but as an artifact of Amazon’s internal revenue-seeking measures. Moving forward, advertisers are advised to:

1. Conduct Data Audits: Review historical campaign data from 2021–2023 to identify periods of inexplicable CPC volatility that do not correlate with seasonal demand spikes or changes in industry-wide search volume.
2. Diversify Ad Spend: The concentration of advertising budgets on a single platform—especially one that controls both the marketplace and the auction mechanics—creates a single point of failure. Brands are increasingly exploring off-site advertising to mitigate reliance on Amazon’s ecosystem.
3. Pressure for Transparency: Industry groups are expected to lobby for stricter reporting requirements, demanding that platforms disclose when and how reserve prices are applied to auctions.

What Lies Ahead

While the unredacted complaint provides a clearer picture of the 2021–2023 period, many questions remain. The FTC has not yet confirmed whether the alleged practices persisted into 2024 or 2025, nor has it provided a comprehensive list of all ad formats involved in the scheme. Sponsored Products, Sponsored Brands, and Display Ads have been mentioned in previous filings, but the full scope of the impact remains the subject of ongoing discovery.

As the case moves forward, the tech and advertising sectors will be watching closely to see if the court finds that Amazon’s behavior constitutes an abuse of its dominant market position. If the FTC prevails, it could force a radical restructuring of how Amazon conducts its advertising business, potentially leading to increased regulatory oversight, mandatory transparency in auction logic, or significant financial penalties. For now, the unsealed documents serve as a stark reminder of the complexities and potential conflicts of interest inherent in the modern retail media landscape. The legal battle continues to unfold, with further disclosures expected to shed more light on the inner workings of one of the world’s largest advertising platforms.