The FTC Says Amazon's Ad Auction Isn't Second Price. Your Bids Are Probably Too High.

If you manage Amazon PPC, the lawsuit filed on August 31, 2026 is not a legal story. It is a bidding story. The FTC and 22 state attorneys general allege that Amazon told advertisers it ran a second-price auction while quietly charging something much closer to first price. If that is true, the bidding logic most accounts have used for the last seven years has been wrong, and the fix is yours to make regardless of how the case ends.

The recommendation: stop treating your max bid as a ceiling you rarely pay and start treating it as the price. Then re-derive every bid from your actual break-even, not from a number you set assuming the auction would discount it for you. Do this before Q4 volume hits, not after.

What the complaint actually alleges

The FTC filed in the U.S. District Court for the Western District of Washington, joined by 22 states. The core allegations, per the FTC’s announcement:

Amazon represented for years that its Sponsored Products, Sponsored Brands, and Display auctions were generalized second-price auctions, where the winner pays one cent more than the next highest bid. In 2019, the complaint says, Amazon added an undisclosed surcharge it called internally a “soft reserve price,” described in quoted internal documents as an invented auction participant. The effect, according to the FTC, was to convert a nominal second-price auction into something functioning as a first-price auction.

The number that matters operationally is this one. The complaint alleges the share of the time Sponsored Products advertisers paid their own full bid amount rose from between 30% and 40% in 2021, to 70% in 2022, to approximately 80% in 2024. The FTC alleges the scheme has extracted tens of billions of dollars from more than one million advertisers, including over 500,000 small and medium businesses.

Amazon disputes the case. The company has said publicly that soft reserve pricing helps establish the market value of an ad placement, that inflation-adjusted average cost per click has been flat, and that its auction systems saved advertisers roughly $8 billion between 2021 and 2025. None of this has been tested in court. These are allegations on one side and a defense on the other.

Why the auction type changes your math

This is not an abstraction. Auction format determines correct bidding behavior, and the two formats point in opposite directions.

In a true second-price auction, you should bid close to your true maximum value, because you will usually pay less than that. Overbidding is cheap. That is exactly what most Amazon PPC guidance has told sellers to do for a decade.

In a first-price auction, bidding your true maximum means you pay your true maximum. The correct behavior is bid shading: bid below your true value and test downward to find the minimum that still wins. The FTC quotes internal Amazon material acknowledging that advertisers bid higher than they were willing to pay because they assumed a second-price auction was running.

So if the allegations hold, a large number of accounts have spent years setting bids under a rule that no longer applied. That is not a rounding error on a $40,000 monthly ad budget. It is the difference between a profitable channel and a channel you subsidize.

The audit to run this month

You do not need the case resolved to act. You need your own data.

1. Pull 90 days of Sponsored Products search-term and placement data at the keyword level. Compare your set max bid against your actual average CPC for each keyword. Where average CPC sits within a few cents of your max bid, the auction is behaving like first price for you, whatever the label on it.
2. Rank keywords by spend. Take the top 20% and cut bids by 10% to 15%. Hold everything else flat as a control.
3. Wait 14 days. Watch impression share, orders, and total contribution, not ACoS in isolation. ACoS improves automatically when you cut bids. That is not the test. The test is whether total profit dollars hold.
4. Where volume held, cut another 10%. Where volume collapsed, restore and mark that keyword as genuinely competitive. You have now found your real bid floor per keyword instead of inheriting one.
5. Check your Prime Day and Black Friday bid multipliers before you set Q4 budgets. The complaint specifically alleges Amazon applied far greater price increases on high-volume shopping days. If you have a standing rule that raises bids across the board on peak days, that rule deserves scrutiny before Cyber Monday, not after.

The mistake to avoid is a panic cut across the whole account. Bid shading works keyword by keyword because competitive density varies. A blanket 20% reduction will hand your best converting placements to a competitor and you will not know which cut caused the damage.

The strategic read

Two things follow from this, and neither depends on who wins in court.

First, single-channel dependence keeps getting more expensive. If Amazon Ads is your only demand engine, you have no leverage and no benchmark. Brands running Walmart Connect alongside Amazon have something most Amazon-only sellers do not: a second auction to compare against. When one channel’s efficiency degrades, you can move budget instead of absorbing the cost. That optionality is worth building before you need it.

Second, litigation of this size moves slowly and rarely produces a refund that changes your P&L. Whatever remedy eventually arrives, it will not fix your Q4. Your bid structure will. Treat the complaint as free market intelligence about how the auction actually prices, and act on it now.

The operators who come out ahead here are not the ones waiting for a ruling. They are the ones who spend the next two weeks finding out what their keywords actually cost to win.

If you want your Amazon and Walmart ad accounts rebuilt around real bid economics rather than assumptions, a strategy assessment is the fastest way to get started.