If you've ever raised your Amazon ad bids again and again, watched your spend climb, and still lost the auction, there may be a reason for that, and regulators are now asking Amazon to explain it. The Federal Trade Commission has drafted a formal complaint against Amazon, alleging the company misled advertisers through undisclosed "reserve pricing" in its sponsored ad auctions. Multiple state attorneys general are involved, and the investigation could wrap up through a lawsuit or settlement as soon as this summer.
No complaint has been filed yet, and no settlement has been reached. But the fact that a draft exists at all is a meaningful step up the regulatory ladder, and sellers who run Amazon ads should understand what's at stake.
What Is Reserve Pricing, and Why Does It Matter?
A reserve price is a hidden minimum bid: a floor that advertisers must clear before their ad can even enter the running. The problem, according to the FTC, is that advertisers didn't know this floor existed. They believed they were bidding against other buyers in a fair, open auction, but they weren't told they were also bidding against a secret number that Amazon set on its own.
Think of it this way: you're at an auction, you keep raising your paddle, and you have no idea the auctioneer won't even start the clock until someone hits a number only the auctioneer can see. You might keep bidding against thin air, convinced that someone else in the room is outpacing you, when the real obstacle is a floor you never knew existed.
That's what the FTC's investigation centers on. The probe is run by the agency's consumer protection unit, and the core question is whether Amazon's failure to disclose these floors constitutes deceptive advertising practices.
The Practical Impact on Ad Spend
For brand sellers and advertisers, this isn't just a regulatory headline. If reserve prices were hidden, some advertisers may have repeatedly raised bids in an attempt to win placements, without knowing there was a floor they couldn't beat with their existing bids alone. The result: inflated ad costs with no clear explanation for why campaigns kept underperforming.
Amazon's advertising business generated $68.6 billion in revenue last year. Even a small systematic inflation of bids across that base would add up fast, which is exactly why regulators and state attorneys general are paying attention. The FTC's own penalty power is limited, but state consumer protection laws allow for fines that stack daily, per violation. Across billions of ad impressions, that math can get very large, very quickly.
It's worth noting that Amazon settled with the FTC for $2.5 billion in 2025 over deceptive Prime enrollment practices. That precedent isn't lost on either side here.
If you're investing heavily in Amazon advertising, this is the moment to take a hard look at your auction data. Were your bids consistently falling short in ways your competitors' activity didn't explain? That pattern is worth revisiting with fresh eyes.
What Happens If the FTC Wins (or Settles)?
The outcome of this case, whether through a court judgment or a negotiated settlement, could change the way Amazon's auction mechanics are disclosed going forward. That would be a genuine long-term win for sellers. Knowing the reserve floor exists, and knowing where it sits, would make bid strategy far more predictable. You'd know whether you're losing to a competitor or to the platform itself, and that distinction changes everything about how you optimize.
Right now, bidding algorithms and manual strategies both learn from auction signals. When a loss caused by a hidden reserve looks identical to a loss caused by a competitor, advertisers misread the data. They may assume competitors are more aggressive than they are, and they adjust accordingly, driving their spend higher on a false premise. Transparent reserve prices would clean up that signal considerably.
For the time being, the investigation is ongoing. The two FTC commissioners whose votes are required before any formal action is taken, Chairman Andrew Ferguson and Commissioner Mark Meador, have not yet publicly stated their positions. So don't expect a dramatic announcement next week.
What Should Sellers Do Right Now?
The honest answer is: don't overreact, but don't ignore it either. You can't file a claim against Amazon today, and you can't opt out of its auction system if you want to advertise on the platform. What you can do is audit your campaigns with this possibility in mind.
Look at campaigns where you've consistently raised bids without winning impressions. Review your impression share data and your cost-per-click trends over the past year. If something doesn't add up, document it. If there's a settlement or judgment that includes advertiser remedies, having clean records of your spend patterns will matter.
More broadly, this is a good time to think about diversifying where you're putting your ad dollars. Amazon remains powerful, but any platform where the auction rules aren't fully transparent carries a strategic risk that's hard to price in.
We'll continue watching this investigation closely. The regulatory environment around digital advertising is shifting, and sellers who stay informed will be in a better position to adapt when the rules change.
If you want to talk through your Amazon advertising strategy in light of all this, we're happy to take a look at what you're working with. Schedule a call with our team and we'll walk through your auction data, your bidding approach, and where there may be room to tighten things up regardless of what the FTC ultimately decides.