What to know about DMA gatekeeper obligations and sellers

The Digital Markets Act changed the legal position of Amazon sellers in Europe in ways that most sellers have not yet mapped to their day-to-day operations. A suspension that looks final may have an appeal path that did not exist before. A ranking demotion or a self-preferencing decision by the platform may now be challengeable. The rules are in force, the obligations on Amazon are live, and sellers who know how to use them are in a materially different position from those who do not.

TL;DRThe Digital Markets Act (DMA) imposes binding obligations on designated gatekeepers – including Amazon as an operator of a major marketplace – that directly affect how the platform can treat third-party sellers. Sellers have enforceable rights under those obligations: rights to fair ranking, to meaningful access to their own data, and to a non-discriminatory environment. A suspension or restrictive measure imposed by a DMA gatekeeper is subject to those obligations, and the seller's statement-of-reasons and internal-complaint rights apply on top of existing Platform-to-Business (P2B) and Digital Services Act (DSA) protections.

This FAQ hub covers what the DMA gatekeeper obligations actually mean for sellers on Amazon UK, how the procedural path works in practice, and the decision points that determine whether a seller recovers their position or loses it quietly. For a fuller picture of the broader regulatory regime, see our complete guide to EU marketplace regulation for sellers.

What does "DMA gatekeeper" status mean for sellers on Amazon UK?

Amazon has been designated a gatekeeper under the Digital Markets Act for its online intermediation services, meaning its obligations under the DMA are legally binding and enforceable.

The term "gatekeeper" is not a generic description of platform size. It is a specific legal designation issued by the European Commission. Once designated, the gatekeeper must comply with a set of defined obligations toward business users – that is, toward sellers who use the platform to reach consumers. Those obligations include requirements around fair and non-discriminatory treatment, transparency in ranking, access to data the seller generated, and restrictions on how the gatekeeper can favor its own products and services over third-party listings.

For a seller on Amazon UK, this matters in a concrete operational sense. When we look at a suspension or a listing demotion on that surface, we now review it against three overlapping regimes: the Platform-to-Business Regulation, the Digital Services Act (which applies to Amazon as a Very Large Online Platform, or VLOP), and the DMA. Each layer creates different obligations and different enforcement levers. The DMA's gatekeeper obligations are the sharpest tool because they are specific, mandatory, and backed by significant financial penalties that the Commission can impose on the platform.

A definition that is useful to carry: the DMA's "business user" is any commercial entity that uses the gatekeeper's core platform service to offer goods or services to consumers located in the European Union. An Amazon seller trading from the UK who sells to EU buyers and through the Amazon marketplace falls within that definition, and the protections follow from it.

In matters we handle, the first question we ask is always which obligation has arguably been breached. That framing – obligation, breach, remedy – is the correct legal structure for engaging with a DMA-related dispute. It is different from the internal appeal logic Amazon designed, and that difference is where the leverage sits.

Which DMA obligations matter most to third-party sellers?

The DMA obligations with the greatest day-to-day relevance for third-party sellers are those on fair ranking, self-preferencing, data access, and the prohibition on using non-public seller data to compete against the seller.

Ranking transparency is one of the most operationally significant obligations. The DMA requires that gatekeepers apply fair and non-discriminatory ranking conditions to business users and that those conditions be transparent. If a seller notices a sustained, unexplained ranking drop that does not correlate with their own performance metrics, that may be relevant to a DMA analysis. Under the P2B Regulation – which sits alongside the DMA – the platform must already publish the main parameters used to determine ranking. The DMA strengthens that requirement for designated gatekeepers.

The self-preferencing prohibition is the headline obligation in the DMA. A gatekeeper cannot treat its own products or services more favorably in ranking than comparable third-party products. This matters to sellers who compete with Amazon's own private-label products or with Amazon-exclusive brands. In practice, the prohibition does not mean equal placement in every case – it means the gatekeeper cannot use its control of the platform as an instrument to structurally disadvantage third-party sellers in favor of its own competing offer.

Data obligations under the DMA are also significant. The gatekeeper must give business users access to data they generated through their activity on the platform. For a seller, this means access to data on their own sales, clicks, conversions, and customer interactions – data the platform holds but may otherwise use asymmetrically. Where a seller is trying to understand whether a ranking change correlates with a platform commercial decision, data access matters both practically and legally.

Finally, the prohibition on using non-public business-user data to compete is directly relevant. The DMA prohibits a gatekeeper from using data that is not publicly available – including data derived from a seller's activity on the platform – to develop or improve competing products. If a seller has evidence that their product data was used in this way, that is a DMA-specific concern.

How does the DMA interact with the DSA and the P2B Regulation for a suspended seller?

When an Amazon seller on UK or EU surfaces faces a suspension or a restrictive measure, the DMA, the DSA, and the P2B Regulation operate as overlapping but distinct instruments – each creating different procedural rights and different enforcement paths.

The P2B Regulation, which has applied since 2020, gives business users a right to a statement of reasons before any restriction or suspension. That statement must be specific, must reference the grounds, and must be given in advance except where the restriction is required immediately for legal or security reasons. In practice, many Amazon suspension notices do not fully meet this standard. The P2B statement-of-reasons requirement is a procedural floor, and when it is not met, that is itself a point to raise in the internal complaint.

The DSA, which applies to Amazon as a VLOP, adds requirements around the internal complaint-handling system. The platform must make the complaint system easily accessible, process complaints diligently, and provide a reasoned response. Sellers who receive a suspension that fails to specify the policy ground, or who receive a boilerplate rejection of their first appeal, have a DSA-grounded basis to push for a more substantive engagement. For a deeper walkthrough of how to use those mechanisms, our guide on handling Amazon as a Very Large Online Platform sets out the step-by-step process.

The DMA then sits on top of both. Where the conduct that led to the suspension is itself a potential breach of a gatekeeper obligation – for example, where the restriction appears to relate to self-preferencing or to a data-driven commercial decision – the DMA gives a seller a basis to raise the matter through the Commission's enforcement process or through national courts. That path runs in parallel with, not instead of, the DSA internal-complaint route.

In practice, we often see sellers treat these instruments as interchangeable when they are not. The sequencing matters. The internal complaint under the DSA/P2B is typically the first procedural step. The DMA enforcement route is the escalation. Mixing them up, or skipping the internal-complaint stage, can close off options that would otherwise be available.

What does the seller's internal-complaint path actually look like on Amazon?

Amazon's internal complaint-handling system – required under the DSA – is the mandatory first step before any external escalation under EU marketplace rules, and using it correctly shapes everything that follows.

The internal complaint must be submitted through Seller Central, typically through the Account Health section or the relevant performance notification. The complaint should do three things: identify the specific measure being challenged (the suspension, the listing removal, the ranking restriction), identify the legal or policy ground the seller says was breached or not properly explained, and request a reasoned response that addresses the specific points raised.

A complaint that simply resubmits the original Plan of Action, or that repeats the seller's commercial history without engaging the legal ground, will typically receive the same result as the original appeal. The internal-complaint right is more powerful than a standard appeal because the platform has a legal obligation to engage with it substantively – but only if the complaint actually frames a legally cognizable point. That framing is where the practice-specific skill sits.

For sellers facing a ranking issue rather than a suspension, the path is slightly different. The relevant route there is the P2B complaint about ranking parameters, which the platform must handle separately. Our step-by-step guide on handling an unfair ranking complaint under EU rules covers that specific variant.

The timeline for a meaningful response varies. We regularly see initial responses within days, but substantive engagement – the kind that actually resolves the underlying issue – typically takes several weeks. A complaint that is legally well-constructed tends to move faster because it creates a clear obligation that is harder to deflect with an automated response.

One practical point that matters: the internal complaint creates a record. If the matter later escalates – to the DSA out-of-court dispute settlement body, to a national court, or to a Commission complaint – the substance of the internal-complaint exchange becomes part of the evidentiary foundation. A poorly framed complaint or a complaint that concedes points the seller did not need to concede can affect that later record. This is one of the main reasons that a seller handling this alone, without legal guidance, often makes the escalation path harder than it needed to be.

What are the seller's escalation options if the internal complaint fails?

If Amazon's internal complaint system produces an inadequate response, sellers have meaningful external escalation options under EU law – including out-of-court dispute settlement, national court proceedings, and Commission engagement.

The DSA requires that a VLOP like Amazon offer access to out-of-court dispute settlement (ODS) bodies certified under the DSA. These bodies are independent, relatively accessible, and have the authority to make binding decisions. For many disputes – particularly those involving a suspension where the seller has a strong legal argument but limited practical leverage inside the platform – an ODS proceeding is a realistic path. The ODS route is typically faster and less expensive than court litigation.

National court proceedings remain available, particularly for claims grounded in P2B breaches. The P2B Regulation has direct effect in EU member states, and courts have jurisdiction over claims that a platform failed to provide an adequate statement of reasons or violated the prohibition on retroactive changes to terms. UK sellers with EU sales have a more complex jurisdictional picture post-Brexit, and that requires a case-specific analysis.

For DMA-specific matters – particularly those involving structural conduct like self-preferencing or data misuse – the primary enforcement authority is the European Commission. A business user cannot bring a private DMA claim directly before the Commission in the same way as an ODS complaint, but the Commission does accept complaints from business users and from member state authorities. A well-documented complaint, supported by a seller's own data, can contribute to an ongoing investigation or trigger one. The value to an individual seller is indirect but not negligible: Commission proceedings create pressure that can change commercial behavior.

A seller facing a suspended account on Amazon UK today should not assume that the internal appeal and the Commission complaint are the only options. Between those poles, there are procedural tools that are faster, more targeted, and – in our assessment – more often decisive for an individual seller's recovery of their position. The decision about which path to use depends on the specific grounds of the suspension, the value of the account, and the strength of the available evidence.

A bridge before your next step: the paths above describe the standard procedural sequence. Your situation turns on the exact wording of the suspension notice, the platform's stated grounds, and what the internal-complaint exchange reveals – which is what we review first.

To discuss the options for your account, email info@tutamenlaw.com.

What is the myth that EU marketplace sellers have no leverage – and why is it wrong?

The single most persistent misconception we encounter is that once Amazon suspends a seller under EU rules, the seller has no realistic leverage and must simply wait for the platform to act.

That view was more defensible before the P2B Regulation, the DSA, and the DMA came into force. The cumulative effect of those instruments is that a designated gatekeeper operating in the EU is now under a web of legally enforceable obligations that create real leverage for sellers who know how to use them.

Consider what the obligation stack actually provides. The platform must give a specific, pre-suspension statement of reasons. It must maintain an accessible, diligent internal complaint system. It must provide access to out-of-court dispute settlement. It must not use the seller's non-public data to compete against them. It must apply fair, transparent ranking conditions. Each of these is not a guideline or a best-practice recommendation – it is a mandatory legal requirement with regulatory or judicial enforcement available where it is not met.

In matters we handle, a seller who comes to us with a well-documented account of what happened is rarely in a position of no leverage. They are frequently in a position of unexercised leverage, which is a different problem and a solvable one. The work is to identify which obligation was breached, construct the internal complaint correctly, and deploy the escalation path that fits the specific facts.

The myth that EU sellers are powerless likely persists because the leverage requires knowledge to use. A seller who files a generic appeal through Seller Central without referencing the applicable legal obligation is not using the DMA's tools. A seller who correctly identifies that the suspension notice lacks the specificity required by P2B, and frames the internal complaint around that, is in a materially better position. The difference is not the underlying facts – it is the legal framing.

If a first internal complaint has already been rejected without substantive engagement, that is not the end. A second, legally reframed complaint – one that identifies the specific procedural failure in the first response – often produces a different result. If a first appeal or internal complaint came back rejected, a second read can find the specific reason it failed and what, if anything, is still open.

To have your situation reviewed, email info@tutamenlaw.com.

Related areas

• EU Marketplace Regulation – legal representation for sellers under DSA, DMA, and P2B
• Amazon Account Reinstatement – review and appeal of deactivation notices across Amazon surfaces

FAQ: DMA gatekeeper obligations and sellers

How long does resolving DMA gatekeeper obligations and sellers usually take on Amazon UK?

The timeline depends heavily on which route is used and how the matter is framed. An internal complaint under the DSA that is well-constructed – specific, legally grounded, and responsive to the exact suspension grounds – can produce a meaningful response within several weeks. Where the internal complaint fails and the matter moves to an out-of-court dispute settlement body, proceedings typically run over a period of months. A Commission complaint or national court proceedings will take longer still. In matters we handle, the internal complaint stage, done correctly, resolves a significant share of cases without external escalation. The seller's account history, the clarity of the suspension grounds, and the strength of the available evidence all affect how quickly the process moves.

What are the main risks if I handle DMA gatekeeper obligations and sellers alone?

The principal risk is framing the internal complaint incorrectly and inadvertently closing off the escalation paths that remain open. A complaint that concedes a factual point the seller did not need to concede, or that fails to identify the specific P2B or DMA obligation at issue, creates a record that is harder to work with on escalation. Sellers who handle this alone also frequently conflate the standard appeal process with the legal internal-complaint right, and treat them as interchangeable when they are not. The DSA complaint has a legal basis and a legal effect that a standard Seller Central appeal does not. Missing that distinction is the most common and most consequential error we see when sellers come to us after handling the first stage themselves.

Do I need a lawyer for DMA gatekeeper obligations and sellers?

Not in every case, but the legal complexity of the DMA and DSA regime is real, and the cost of a poorly framed complaint is high relative to the effort of getting the framing right at the outset. A seller whose suspension is straightforwardly procedural – where the platform failed to give the required statement of reasons, and the internal complaint is essentially a demand for that statement – may be able to manage the first stage without legal support. A seller whose suspension involves DMA-specific concerns – self-preferencing, data use, ranking conduct – is working with instruments that require legal analysis to deploy correctly. For matters on Amazon UK involving any DMA element, attorney-led engagement is worth the cost at the internal-complaint stage, because that stage shapes everything that follows.

About Tutamen

Tutamen is an independent law firm for online marketplace sellers. We represent Amazon, Walmart, Etsy and eBay sellers in account deactivations, frozen-funds recovery, intellectual-property disputes, arbitration and Notices of Dispute, and US federal Schedule A defense, plus EU marketplace regulation. Our work is attorney-led and confidential, with fees quoted up front. We act for founders, brand owners and in-house teams who need a specialist for a marketplace dispute. Work on DMA, DSA, and P2B matters is led by practitioners with direct experience of EU marketplace regulation in live seller disputes; all engagements are confidential and handled under attorney-client privilege. To discuss your situation, email info@tutamenlaw.com.

Page authored by Dmitri Aronov, Partner, EU Marketplace Regulation, Tutamen.

Disclaimer: This article is general information, not legal advice, and does not create an attorney-client relationship. Marketplace policies and the law change, and every account and case is different. For advice on your situation, contact Tutamen at info@tutamenlaw.com.