FTC Drafts Complaint Against Amazon Over Hidden Ad Pricing That Cost Advertisers Billions
The US Federal Trade Commission has drafted a complaint against Amazon accusing the company of concealing critical pricing information from advertisers who buy sponsored product placements on its platform. The draft targets "reserve pricing," invisible price floors that advertisers must clear before their bids are eligible to win an ad slot. With Amazon’s advertising business generating $68.6 billion in 2025, the case could expose the company to billions in civil penalties if state attorneys general pursue enforcement under their own consumer-protection statutes.
Hidden reserve pricing turns every advertiser’s bid into a blind negotiation where the platform holds all the cards.
Why It Matters
Amazon has quietly become the third-largest digital advertising seller in the world, behind only Google and Meta. What began as a modest sponsored-products feature has grown into a $68.6 billion annual revenue stream, according to Amazon’s 2025 annual filing with the Securities and Exchange Commission. For context, that figure now rivals the entire global newspaper industry’s annual ad revenue.
Millions of brands, from kitchenware startups to Fortune 500 consumer packaged goods companies, depend on Amazon’s ad ecosystem to reach shoppers at the moment of purchase intent. Many advertisers and agencies run Amazon Ads alongside their Meta, TikTok, and Google campaigns, treating the platform as an essential piece of a cross-channel budget. When the pricing mechanics of a platform this large are opaque, the financial consequences ripple across the entire digital advertising supply chain.
The FTC’s scrutiny arrives at a moment when regulators worldwide are questioning how major platforms disclose, or fail to disclose, the workings of their auction-based ad systems. Google faces a parallel investigation into similar auction practices, signaling that ad pricing transparency is becoming a defining regulatory issue for the late 2020s.
What’s New: How Hidden Reserve Pricing Works
To understand the FTC’s concern, you need to understand how Amazon’s sponsored-product auctions function. When a shopper searches for "running shoes" on Amazon, multiple advertisers compete in a real-time auction for the top sponsored-result slots. Each advertiser submits a bid, the maximum amount they are willing to pay per click. But before any bid is considered, it must clear a reserve price: a minimum threshold set by Amazon below which no ad will be shown.
In a transparent auction, advertisers know the reserve price. They can decide whether the floor makes economic sense for their margins and adjust their strategy accordingly. The FTC’s draft complaint alleges that Amazon did not disclose these reserve prices to advertisers. An advertiser whose bid falls below the hidden floor sees only that they lost the auction. Their rational response, raise the bid, means they end up bidding against an invisible number that only Amazon can see. The result is straightforward: more ad spend flows to Amazon, and advertisers pay more than they would in a fully transparent market.
The technical term for this practice is "blind reserve pricing," and it is not unique to Amazon. But the scale of Amazon’s advertising operation, billions of auctions per day across millions of product categories, makes the aggregate financial impact substantial. Multiplied across every advertiser who raised a bid to clear an undisclosed floor, the excess spend could reach into the billions.
The FTC is examining whether this constitutes a deceptive practice under Section 5 of the FTC Act, which prohibits unfair or deceptive acts or practices affecting commerce. The agency has been building expertise in algorithmic pricing and auction mechanics for several years, hiring data scientists and economists specifically to investigate cases like this.
The Numbers
- $68.6 billion: Amazon’s advertising revenue in 2025, making it the third-largest online ad seller globally behind Google and Meta (Amazon 2025 Annual Report, SEC Filing)
- Third major regulatory front: The ad pricing case joins Amazon’s $2.5 billion Prime subscription settlement (2024) and an antitrust trial scheduled for early 2027 over allegations it pushed brands to raise prices at rival retailers (FTC Announcement, October 2024)
- Multiple state attorneys general: State AG involvement could trigger fines of tens of thousands of dollars per violation, per day, multiplied across Amazon’s ad volume, this pushes potential penalties into the billions
- FTC investigation timeline: The agency has been examining Amazon’s practices since at least 2019, with the ad pricing probe representing a newer front opened as the advertising business surged
- Parallel Google probe: The FTC is also examining Google over similar auction-concern practices, suggesting a coordinated regulatory focus on ad platform transparency
When an ad platform sets invisible price floors, advertisers bid against a number only the platform can see, and every incremental bid raise flows directly to the platform’s bottom line.
What Comes Next
No complaint has been filed yet, and both the FTC and Amazon have declined to comment publicly. The agency’s two Republican commissioners, Andrew Ferguson and Mark Meador, would need to vote before any lawsuit or settlement can proceed. Observers expect the matter could wrap up as soon as summer 2026, either through a formal lawsuit filing or a negotiated settlement.
The involvement of state attorneys general is the factor that transforms this from a routine regulatory inquiry into a serious financial threat. The FTC’s own statutory authority to extract civil penalties is limited. State consumer-protection laws, however, often allow fines of tens of thousands of dollars per violation, per day. When applied across the staggering volume of ads Amazon serves daily, those figures compound rapidly, which is how analysts arrive at the "billions" estimate.
For Amazon, the timing is particularly sensitive. The company’s advertising business has been its fastest-growing profit engine, subsidizing investments in logistics, streaming, and AI. Any disruption to advertiser confidence, or any mandated transparency that reduces effective cost-per-click, would hit a business line the company can least afford to see slow down.
What This Means for Advertisers
If you buy advertising, whether for a single brand or across a portfolio of clients, this investigation should put ad platform transparency on your radar. Here are the concrete implications:
Audit your Amazon ad spend. If you run Sponsored Products or Sponsored Brands campaigns, review your cost-per-click trends over the past 12 months. Look for unexplained cost escalations that cannot be attributed to increased competition or seasonal demand shifts. While you cannot see Amazon’s reserve prices directly, sustained CPC inflation without corresponding conversion improvements warrants scrutiny.
Diversify your platform mix. Regulatory pressure on Amazon could reshape the economics of marketplace advertising. Now is the time to ensure you are not overdependent on any single ad platform. A balanced mix that spans marketplace ads alongside other channels protects your budget from platform-specific shocks.
Watch for transparency mandates that spread. If the FTC secures a settlement or ruling requiring Amazon to disclose reserve pricing, expect that precedent to cascade. Advertisers on Google, Meta, and other platforms will likely demand similar disclosures. The marketer who already understands auction mechanics and asks informed questions about pricing transparency will be ahead of the curve.
Treat transparency as a vendor criterion. The FTC’s case is ultimately about whether platforms deal fairly with the businesses that fund them. As you evaluate ad platforms, transparency should be a factor in your decisions. Platforms that disclose their pricing models and auction mechanics earn trust; those that don’t carry hidden costs you may only discover in a quarterly review.
The Bigger Picture
The FTC’s draft complaint against Amazon is about more than one company’s auction mechanics. It signals that ad pricing transparency is becoming a regulatory priority, with consequences that will reshape the economics of digital advertising across every major platform. For marketers who steward brand budgets across multiple channels, the lesson is clear: opacity has a cost. Whether that cost shows up as inflated CPCs, eroded trust, or regulatory penalties, the platforms that build their businesses on hidden mechanics are operating on borrowed time. The brands that ask hard questions about pricing now will be the ones best positioned to thrive when transparency becomes the standard, not the exception.
FAQ
What is reserve pricing in Amazon advertising?
Reserve pricing is a minimum bid threshold Amazon sets for its sponsored-product auctions. Before an advertiser’s bid is eligible to win an ad slot, it must exceed this floor. The FTC’s draft complaint alleges Amazon did not disclose these reserve prices, so advertisers who bid below the hidden floor saw only that they lost the auction and often raised their bids in response, effectively bidding against an invisible number only Amazon could see.
How much does Amazon make from advertising?
Amazon generated $68.6 billion in advertising revenue in 2025, according to the company’s annual SEC filing. That makes it the third-largest digital advertising seller globally, behind only Google and Meta, and roughly comparable to the entire global newspaper industry’s annual ad revenue.
What could the FTC action mean for Amazon advertisers?
If the FTC prevails through settlement or ruling, Amazon could be required to disclose reserve prices, letting advertisers make more informed bidding decisions and potentially lowering their cost-per-click. A settlement could also include refund mechanisms or credits for advertisers who overpaid due to undisclosed reserve pricing. In the near term, advertisers should watch for changes to Amazon’s ad platform terms of service or auction documentation.