Amazon Marketing Cloud: What AMC Actually Does

What Amazon Marketing Cloud Actually Is

AMC is a clean room built on AWS infrastructure. Advertisers query pseudonymized signals — attributed impressions, clicks, conversions, browse events — alongside their own pseudonymized first-party data, without ever seeing or exporting raw personal information. Amazon can't access your data inside it either; the only thing that comes out is aggregated, anonymized answers to the question you asked.

Access depends on how you advertise. DSP advertisers request it through their Amazon Ads account executive. Sponsored ads advertisers can get in through self-serve. Agencies and technology partners can query it on a brand's behalf if they're registered with Amazon Ads Partner Network.

The problem AMC actually solves is simpler than the clean-room language suggests: without it, a DSP display impression and a sponsored product click that both touched the same shopper get reported as two separate wins in two separate dashboards. AMC is the only place you can join those events back to the same pseudonymized shopper and see what actually happened.

How AMC Works, Stage By Stage

Four things happen, in order: your signals land in AMC, you ask a question of them, you get an audience or a measurement answer, and you activate it. Amazon added a 25-month lookback window recently, which matters if you're trying to measure anything beyond a single quarter.

You don't have to write SQL anymore, though you still can. Amazon Ads Academy and the newer Ads Agent let you build queries and audiences with pre-built templates and natural-language prompts. That's lowered the floor for who can use AMC meaningfully — it used to require an analyst on staff; now it mostly requires someone who knows what question to ask.

A Worked Example: What A Real AMC Query Turns Up

Here's what that looks like on an actual book of business, not a hypothetical. Across 30 advertisers we run DSP for, in July 2026, the portfolio delivered 6.04x return on ad spend — measured across the whole book, not cherry-picked from the best line item. That number only means anything because it came from an AMC query that deduplicated exposure across DSP and sponsored ads first, instead of letting each channel claim the same shopper separately.

The rest of the query output: 78.4 million impressions at a $4.00 CPM, a blended $1.42 cost-per-click, and a blended $5.49 cost-per-acquisition across 57,137 attributed purchases. One in five of those purchases — 20.1% — came from a shopper new to the brand. If you've seen a $0.41 CPC quoted for this category elsewhere, that figure is online-video inventory only; it isn't representative of a full DSP book, and quoting it as if it were is one of the more common ways this category misleads people.

Notice what that query does and doesn't prove. The deduplication tells you the number isn't double-counted. It does not, by itself, tell you the display spend caused any of those sales — that's a different question, and AMC's standard attribution is still built on the same click-based logic as everything else. To answer the causality question you need a holdout group or a matched control, not another AMC report.

AMC Audiences: What You Can Build And Where They Go

AMC audiences come in two forms: rule-based (shoppers who did X but not Y, within a window you define) and lookalike (modeled from a seed audience). Once built, they activate directly into sponsored products, sponsored brands, sponsored display, or DSP media buying — the audience isn't stuck in the clean room, it goes to work in the same accounts your campaigns already run in.

• Rule-based: good for exclusions and sequential messaging — people who saw an ad but didn't purchase, for example.
• Lookalike: good for prospecting when you have a strong buyer seed but limited reach.
• Third-party enrichment: paid beta integrations with providers like Experian and NCS extend reach and detail, but they're a separate line item, not included by default.

AMC Certification: Is It Worth Doing

The certification is an eight-course, beginner-level track through Amazon Ads Academy. It's free, and it's built for people with little or no technical background — it walks through what a clean room is, how audiences get built, and how measurement works, without requiring you to write a query yourself.

It's worth doing if you're the person who will actually run queries or brief them. It's not worth doing if your role is deciding budget based on someone else's output — in that case, understanding what the numbers mean matters more than the certificate.

When The AMC Answer Is Bad News

Sometimes a query comes back and it's not what you wanted: overlap between DSP and sponsored ads is higher than expected, or a segment you thought was incremental turns out to already be converting anyway. The instinct is to distrust the query. Usually the query is right and the plan was wrong.

Before you throw out a result, check the obvious things: the lookback window (25 months is available now, but your query might be scoped shorter), whether the join key actually matches your first-party upload, and whether you're comparing attributed sales to attributed sales or accidentally mixing attribution windows. If the numbers hold up after that, the fix isn't a better dashboard — it's a holdout test or a matched control group, because last-click attribution was never built to answer the incrementality question in the first place, inside AMC or anywhere else.

Where This Leaves You

AMC itself is infrastructure, not a media buying service — Amazon doesn't run your campaigns through it, it just lets you see and query what happened. Whether you need help beyond the free tooling depends on whether someone on your team can turn a query into a decision fast enough to matter. reMKTR runs Amazon DSP as a managed service and reconciles the DSP-and-sponsored-ads overlap inside AMC before we'll quote a return to a client, as part of Full Circle's $500M+ in managed Amazon spend across 100+ brands — but that's one specific use of the tool. Plenty of advertisers query AMC themselves and never need a media partner at all.