FTC’s Amazon Ad Auction Lawsuit: Your Retail Media Audit Playbook

The Federal Trade Commission and 22 state attorneys general filed a case on August 31 that puts the retail media ad-buying model on trial. The Amazon ad auction lawsuit alleges the company added a hidden surcharge to its ad auctions in 2019 and quietly kept it there for over seven years. If you run Amazon Sponsored Products, Sponsored Brands, or Sponsored Display, your Amazon return on ad spend numbers from the last five years are about to be re-examined by federal regulators, the states, and every buyer who has looked at their bill and wondered why the average cost kept creeping up.

You do not have to take a side to act. What you need is a plan for how you audit spend, price your Amazon channel against Google and Meta, and talk to clients this quarter. Below is that plan, grounded in what the complaint actually says, what Amazon says back, and what a smaller advertiser can do about it before the case even reaches a first ruling.

What the Amazon ad auction lawsuit actually alleges

The FTC and the state attorneys general filed the complaint in the U.S. District Court for the Western District of Washington. Twenty-two states joined: Alaska, Arizona, California, Colorado, Florida, Idaho, Illinois, Indiana, Iowa, Kentucky, Louisiana, Maryland, Nebraska, New Jersey, New York, North Carolina, Oklahoma, Pennsylvania, Rhode Island, South Carolina, Vermont, and Washington. The Commission vote to authorize the case was 2-0.

The core claim is a change to how Amazon prices its search-based ad auctions. Amazon told advertisers it ran a generalized second price auction, a standard model where the winner pays one cent more than the runner-up bid. Starting in 2019, according to the FTC press release, Amazon added a hidden layer on top of that number, called internally a “soft reserve price.” The complaint quotes Amazon executives calling the price paid by advertisers a “proxy 2nd price that we calculate,” not a real bid from another buyer.

The regulators cite three numbers you should copy into a client-safe brief. In 2021, Sponsored Products advertisers paid their full winning bid roughly 30 to 40 percent of the time. In 2022, that jumped to about 70 percent. By 2024, it reached roughly 80 percent. The FTC estimates the mechanism extracted more than 20 billion dollars from around 1.2 million advertisers, more than 500,000 of them small and medium businesses. Those numbers come straight from the government complaint documents that CNBC and other outlets covered on filing day. Amazon disputes the case in a company blog post and says its policies produced more relevant ads and that average cost per click stayed flat from 2019 to 2024 while sales rose.

Who is exposed inside the Amazon ad auction lawsuit

The complaint focuses on three ad units that show up next to Amazon search results: Sponsored Products, Sponsored Brands, and Sponsored Display. If your ad spend touches any of those inside Amazon Advertising, you sit inside the class of buyers whose historical cost data is about to be scrutinized.

Direct-to-consumer brands are the most exposed because their entire retail-media flywheel runs through Amazon. Marketplace sellers with private label SKUs sit right behind them. Even service brands that use Sponsored Brands to protect trademark search terms have skin in this game because Sponsored Brands is one of the units the complaint names. The FTC says over 500,000 of the affected advertisers are small and medium businesses, which is a plain signal that this is not just an enterprise problem.

Agencies that manage Amazon on behalf of retail clients need to prepare for a specific conversation. Clients will ask if they were overcharged, whether they can recover money, and whether they should keep spending. The honest short answer is that any recovery will happen through the states, which have the power to seek civil penalties, and through Amazon’s response, which so far is a denial. The practical short answer is that your job this quarter is to make the channel earn its keep on the numbers you can measure today.

How to audit your Amazon return on ad spend right now

Start by pulling five years of Amazon Advertising data if you have it. Line up your average cost per click, your average order value, and your return on ad spend by quarter from 2019 forward. The complaint says the share of auctions where the winner paid the full bid climbed from about 30 percent to about 80 percent between 2021 and 2024. That pattern should show up in your account as a slowly rising cost per click without a matching lift in click volume or conversion rate. If you see it, document it with screenshots and export files. Save them in a locked folder before Amazon updates or archives any historical dashboards.

Next, compare Amazon against your Google and Meta buying on the same product lines. If your Amazon return on ad spend has drifted while your Google Shopping numbers held or improved, you have a spend-shift signal. Our note on Google Ads bidding target optimization and the new customer acquisition split both help you set the Google side of that comparison cleanly. Use the same last-click window on both platforms. Do not mix Amazon’s default attribution with Google’s data-driven attribution and expect a fair fight.

Rebuild your ad math around what you can prove. Cost per click and click-through rate belong to Amazon. Sales and margin belong to you. If Amazon shows a five percent return on ad spend lift year over year but your net margin on those sales dropped, the retail channel is not doing what the dashboard says. Bring that view to your next client review.

Rebalance your retail media in a soft-reserve world

The Amazon ad auction lawsuit is going to move slowly. You do not need to wait for a ruling to shift how you buy. Split your retail media spend into three lanes and give each one a goal.

Lane one is defensive brand search. Keep enough Sponsored Brands spend to hold your trademark terms and stop competitors from stealing your keyword. Cap the daily budget to the smallest number that keeps your brand impression share above 80 percent. Any more than that on defensive queries is money the auction can inflate without changing the outcome.

Lane two is category discovery. Move any dollars aimed at winning new-to-brand shoppers into Google Shopping, Meta advantage-plus catalog, and TikTok Shop, where you can measure incrementality with clearer tools. This is where a shift in Meta reporting or a bidding update in Google can matter more than an Amazon setting.

Lane three is off-Amazon lead capture. If you sell services or high-consideration products, a call-tracked pay-per-call model or a lead form on your own site removes the auction question entirely. Our review of CallRail alternatives and pay-per-call attribution covers the tracking stack you need to make that swap without losing conversion data. When you are ready to talk about how to rewire that mix, book time on our free consultation.

What agencies should tell clients this week

Send a short client memo before the news cycle starts asking questions. Three paragraphs is enough. Paragraph one names the case, the filing date of August 31 2026, the court, and the 22 states. Paragraph two summarizes the mechanism in plain English: Amazon allegedly added a hidden price floor on top of its second price auction, and the share of auctions where the winner paid the full bid climbed from 30 to 40 percent in 2021 to about 80 percent by 2024. Paragraph three is your recommendation. It should list the audit steps above and the lane split for retail media.

Do not promise a refund. Do not promise a class recovery. The states can seek civil penalties and the FTC can seek restitution, but the amazon ad auction lawsuit does not have a settlement figure, and Amazon is defending the case. Your value as an agency is the audit and the reallocation, not a legal outcome you cannot control.

If a client wants to know why cost per click on Google Ads has also been sliding, that is a different set of forces, not the same lawsuit. Our recent read on the Google Ads AI Max migration and the language targeting removal covers the pieces of Google’s setup that shifted this quarter, and neither has anything to do with Amazon soft-reserve pricing. Keep the two conversations separate so a client does not walk away confused about which platform is doing what.

Signals to watch across the amazon ad auction lawsuit timeline

The next 90 days are about pleadings and paperwork. Watch for Amazon’s motion to dismiss and any early rulings on the scope of the case. Watch also for parallel private class actions, which usually follow an FTC filing of this size within weeks. Any of those cases can force earlier discovery than the federal case.

Longer term, watch Amazon’s product changes. If Amazon adjusts how it labels or explains reserve pricing inside Amazon Advertising, that is a signal it is reading the room. If a new report shows up in the interface that breaks out reserve-price effects on your winning bid, take screenshots the day it appears. Product changes during active litigation get walked back sometimes.

Watch Google and Meta too. When a competitor is under a spotlight, others often tighten their own transparency around auction mechanics. Our Google Ads Quality Score guide and GA4 source-group setup both help you keep measurement clean on those platforms while the retail media picture gets sorted.

The Amazon ad auction lawsuit is not the end of retail media. It is a mid-decade course correction on how much trust a buyer can place in an auction they cannot see inside. Your job is to build the audit habit, keep the channel accountable to your own return math, and be ready to move budget when the numbers ask you to. Let’s Grow!