FTC Drafts Complaint Against Amazon Over Hidden Ad Pricing, Could Cost Billions

⏱ 7 min read · Last updated 2026-06-18

The US Federal Trade Commission has drafted a potential complaint accusing Amazon of misleading advertisers by hiding the price floors in its sponsored-listing auctions, a move that could lead to billions of dollars in civil penalties if state attorneys general join the case. The investigation, first reported by Bloomberg, zeroes in on whether Amazon properly disclosed the reserve pricing that determines which advertisers win prime real estate on its marketplace. No complaint has been filed yet, but the draft signals a serious regulatory threat to the company’s fastest-growing revenue engine.

Amazon’s ad empire is staring at a billion-dollar reckoning over unseen price floors that advertisers can’t see but must clear to win a spot.

Why It Matters

Amazon’s advertising business has exploded into a $68.6 billion-a-year juggernaut, according to the company’s 2025 annual filing (Amazon 2025 Annual Report). That makes it the third-largest seller of online ads worldwide, behind only Google and Meta, and one of the fastest-growing divisions inside Amazon. The “sponsored listings” that appear at the top of product-search results have become indispensable for brands and sellers that want to be seen on the platform.

When the rules that govern those auctions are opaque, the cost of entry rises for businesses of every size, and the platform captures a larger share of the spoils. The FTC’s draft complaint focuses on a specific mechanism called reserve pricing. If an advertiser doesn’t know the minimum bid required to win a slot, they may keep raising their price against an invisible floor, effectively bidding against nothing. The result is higher ad spend flowing to Amazon, while sellers are left without a clear picture of what they are actually competing against.

What’s New / How It Works

Reserve pricing is a price floor that an auction operator sets below which no ad will be shown. In a transparent system, advertisers would know that floor and decide whether to bid at or above it. The FTC’s concern is that Amazon may have kept those floors hidden, forcing advertisers to bid blindly until they crossed a threshold only Amazon could see.

The draft complaint, based on anonymous sources, examines whether this practice violates consumer-protection laws by luring advertisers into an unfairly expensive auction environment. While the FTC itself has limited power to impose massive fines, the involvement of multiple state attorneys general changes the math dramatically. State consumer-protection statutes often allow penalties of tens of thousands of dollars per violation, per day. Multiplied across the billions of ads Amazon serves annually, the liability could quickly reach “billions,” the report notes. The federal agency is also looking at similar auction practices at Google, suggesting a coordinated push to impose greater transparency across the digital-ad ecosystem.

The Numbers

Amazon’s advertising revenue reached $68.6 billion in 2025, per the company’s annual report.
The company is now the third-largest online ad seller globally, trailing only Google and Meta.
State-level consumer-protection laws can levy fines of tens of thousands of dollars per violation, per day, stacking to billions when applied to the volume of Amazon’s ad inventory.
Amazon already paid $2.5 billion in 2025 to settle FTC claims that it tricked customers into Prime subscriptions.
A separate antitrust trial accusing Amazon of forcing brands to raise prices at rival retailers is scheduled for early 2027.
The FTC could file a lawsuit or reach a settlement as soon as this summer, but must first secure votes from its two Republican commissioners.

Hidden reserve pricing transforms an open auction into a one-sided negotiation where advertisers bid against a floor only Amazon can see.

What Comes Next

The FTC’s investigation could culminate in a formal complaint or a negotiated settlement in the coming months. However, any action will require the votes of Commissioners Andrew Ferguson and Mark Meador, both Republicans, whose stance on the case is not yet public. Even if the federal agency moves forward, the most financially potent threat lies with the states. A coalition of state attorneys general could pursue penalties far beyond what the FTC can extract on its own, turning what starts as a Washington investigation into a multistate liability event.

Beyond Amazon, the probe sets a precedent for how hidden auction mechanics across the ad-tech industry may be scrutinized. Google faces similar questions about its own ad auction transparency, and a successful action against Amazon could embolden regulators to demand clearer disclosure from all major platforms that operate sponsored-product auctions.

What This Means for You

If you run PPC campaigns on Amazon, Google, or any marketplace that uses second-price or floor-based auctions, this investigation is a reminder that what you don’t know can cost you. Shrouded reserve pricing can quietly inflate your cost-per-click without delivering better placement, eroding margins over time. While regulatory outcomes take months or years to materialize, the immediate takeaway is to audit the transparency of every ad platform you buy from. Ask pointed questions about auction rules, request visibility into price floors where possible, and cross-reference performance data with industry benchmarks to spot anomalies.

For any business that relies on digital advertising, the case also highlights the growing intensity of regulatory attention on online marketplaces. Staying informed about policy shifts can help you adjust budgets and strategies before fines or rule changes hit. You don’t need to be a legal expert, but you do need to watch these developments. For broader context on how consumers and brands experience digital trust, see our post on consumer trust in AI-driven brand messaging. And for more analysis on the digital advertising landscape, visit the BizScoreAI blog.

The Bigger Picture

The FTC’s draft complaint against Amazon is not an isolated regulatory skirmish; it is the latest front in a sustained push to bring transparency to the opaque mechanics of digital advertising. If state enforcers succeed in extracting billion-dollar penalties, the economics of hidden auction floors could shift overnight, forcing every major platform to either disclose reserve pricing or abandon the practice. For advertisers, that would mean a fairer playing field and clearer costs. For Amazon, it would mean the quiet money machine at the heart of its e-commerce dominance suddenly gets a lot louder, and a lot less predictable.

Frequently Asked Questions

What is Amazon reserve pricing in advertising?

Reserve pricing is the minimum amount an advertiser must bid to win a sponsored-product slot in Amazon’s search results. It acts as a price floor; if a bid falls below that threshold, the ad isn’t shown. The FTC’s draft complaint alleges that Amazon did not always disclose these floors, leaving advertisers to bid blindly and potentially pay more than necessary to cross an invisible line.

How does hidden ad pricing affect advertisers on Amazon?

When reserve prices are not disclosed, an advertiser who misses the floor may keep raising their bid without knowing the real minimum. This effectively means they are bidding against a number only Amazon can see, which can inflate their cost-per-click without improving the ad’s position. Over time, opaque pricing can erode campaign ROI and transfer more ad spend to the platform.

Why could Amazon face billions in penalties over this case?

The FTC alone has limited power to levy massive fines, but the investigation reportedly involves multiple state attorneys general. Many state consumer-protection laws allow fines of tens of thousands of dollars per violation, per day. Because Amazon serves billions of ads each year, even a modest per-violation fine can accumulate into billions of dollars in total liability if a large number of advertiser transactions are found to be affected.

Is Google facing a similar FTC investigation into ad auctions?

Yes. The FTC is reportedly examining Google over similar concerns about hidden auction mechanics in its advertising systems. While details are less public, the parallel scrutiny suggests that regulators are targeting a pattern of opaque pricing across major digital ad platforms, not just Amazon.

What should advertisers do to protect themselves from hidden ad costs?

Advertisers can start by requesting transparency from platforms about auction rules and reserve pricing. Audit performance data for unusual cost increases that aren’t explained by competition. Use third-party tools and benchmarks to estimate fair bid levels. Diversify ad spend across multiple platforms to reduce dependency on any single opaque auction. And stay informed on regulatory actions that could force disclosure changes, potentially lowering costs.

When will the FTC formally file the Amazon advertising lawsuit?

Reports indicate the FTC could bring a lawsuit or reach a settlement as soon as this summer, but no official complaint has been filed. The agency must first secure votes from its two Republican commissioners, Andrew Ferguson and Mark Meador, before taking formal action.

What does the FTC complaint allege about Amazon’s ad pricing practices?

The draft complaint accuses Amazon of misleading advertisers by failing to properly disclose the reserve pricing, the minimum bid thresholds, for its sponsored-listing auctions. The allegation is that this lack of transparency allows Amazon to artificially inflate bid levels, causing advertisers to spend more than they would in a fully open auction, in potential violation of consumer-protection laws.