Unfair ranking complaint under EU rules: what it means for marketplace

An Amazon IT seller who discovers that its listings have slipped without explanation faces a specific, unsettling problem. The product has not changed. The price is competitive. But the organic position has moved, and revenue has followed it down. At that point, one question dominates the conversation: does EU law actually give this seller any right to challenge what the platform did – and if so, how?

TL;DRAn unfair ranking complaint under EU rules is a formal challenge, available to third-party sellers on platforms such as Amazon IT, to the way a platform determines and applies ranking criteria to their listings. The Platform-to-Business (P2B) Regulation requires platforms to disclose the main ranking parameters and to explain, on request, any ranking decision that materially affects a seller. The Digital Services Act (DSA) adds further obligations around transparency and non-discriminatory treatment for Very Large Online Platforms (VLOPs). Where those obligations are breached, sellers have procedural tools – internal complaint, regulatory escalation, and in some cases civil action – that do not exist in most non-EU markets.

This analysis covers what an unfair ranking complaint actually involves on Amazon IT, how the procedural path works in practice, and where the real decision points sit for a seller weighing its options. It does not assume that every ranking drop is actionable – but it does explain how to find out whether yours is.

What does "unfair ranking" actually mean under EU law on Amazon IT?

The P2B Regulation, which has applied across the EU since mid-2020, established for the first time a binding set of rights for business users of online platforms – including marketplace sellers. Ranking is one of its central subjects. A platform must, in its terms and conditions, set out the main parameters that determine ranking and the relative importance of those parameters. That obligation is not merely a disclosure formality. It creates a baseline against which a seller can test whether the ranking it receives is consistent with the stated criteria.

On Amazon IT, the Business Solutions Agreement and the associated ranking disclosures function as the documented framework. In practice, those disclosures are written at a level of generality that gives Amazon significant operational flexibility. That flexibility is not unlimited. Where a seller can show that its ranking moved in a way that is materially inconsistent with the disclosed parameters – or that the platform applied a criterion it did not disclose – there is a factual basis for a complaint.

The DSA adds a layer that matters specifically for Amazon, which the European Commission designated as a Very Large Online Platform (VLOP) under the DSA. VLOP obligations include obligations around the recommender systems that determine what content and products users see. A ranking mechanism is a recommender system in regulatory terms. DSA Article obligations on transparency and auditability of recommender systems apply, and the Commission can require an audit of those systems as part of its enforcement powers.

What this means operationally is that a seller on Amazon IT is not simply at the mercy of an algorithm with no recourse. The P2B Regulation and the DSA together create a legal infrastructure that, if used correctly, gives the seller tools that a US-only seller lacks entirely. Understanding which tool applies to which fact pattern is where the analysis begins. For sellers also asking about broader self-preferencing concerns, our analysis of what to know about a self-preferencing complaint under the DMA sets out the DMA's separate gatekeeper obligations in detail.

How does the internal complaint mechanism work – and why does it matter?

The P2B Regulation requires platforms to operate an internal complaint-handling system for business users, and Amazon's is the first procedural step in any unfair ranking complaint. This is not optional, and it is not merely cosmetic. A seller who bypasses the internal mechanism and goes straight to a national authority or a court typically weakens its position, because the internal complaint creates the documentary record – and because the regulation is structured to encourage resolution at that level before escalation.

In matters we handle involving Amazon IT sellers, the internal complaint is the point at which the quality of the seller's written analysis makes the largest difference to the outcome. A complaint that says "our ranking dropped and we want it fixed" will not produce a substantive response. A complaint that identifies the specific parameter disclosure, sets out the timeline of the ranking change, and advances a reasoned case that the platform's treatment is inconsistent with its stated criteria – that is a document that the platform's regulatory compliance function has to engage with.

The platform is required under the P2B Regulation to acknowledge the complaint and handle it in a reasonable timeframe. What it is not required to do is agree with it. But the response, or the absence of a substantive response, itself becomes evidence of how the platform has handled the matter. That evidence is relevant to any regulatory escalation that follows.

A note on timing: the seller should act promptly. Ranking drops that are not documented at the time they occur are harder to reconstruct later. Screenshots of the listing's organic position, the date the drop occurred, and the state of the account's metrics at that date are the foundation of any complaint. In our practice, we regularly see sellers who arrive weeks or months after the drop with no contemporaneous documentation – which makes the procedural case harder to build.

What role does the DSA play – and does it give sellers direct rights?

The DSA's seller-facing rights are more indirect than the P2B Regulation's, but they are real. As a VLOP, Amazon must provide meaningful transparency about the parameters of its recommender systems, must maintain an internal complaint-handling mechanism compliant with DSA obligations, and must submit to audits commissioned by the European Commission or, in some cases, national Digital Services Coordinators (DSCs).

A seller on Amazon IT cannot directly enforce DSA obligations against Amazon in the way it can assert a P2B Regulation breach. The DSA is primarily a public regulatory instrument: enforcement sits with the Commission (for VLOPs) and national Digital Services Coordinators. But an individual seller can trigger regulatory attention by filing a complaint with the relevant Digital Services Coordinator in the member state where it is established or, in some cases, with the Commission directly via the DSA's complaint channels.

That regulatory complaint is not a fast route to a ranking reinstatement. What it can do is generate regulatory pressure on the platform in parallel with the seller's own internal complaint. We work with appropriate local counsel in Italy when regulatory filings with Italian DSA authorities are the right step. The decision to file a regulatory complaint is a strategic one: it changes the character of the dispute and is generally more appropriate where the seller's issue is systemic – affecting many products or reflecting a pattern of conduct – rather than a one-off algorithmic change.

The DMA adds a further layer for sellers whose ranking concern involves self-preferencing: the prioritization of Amazon's own products or those of its vertically integrated subsidiaries over independent third-party listings. The DMA's gatekeeper obligations address this directly. For matters that sit at the intersection of ranking and self-preferencing, the two instruments overlap in a way that gives a seller multiple angles to work. Our guide to EU marketplace regulation for sellers explains how the P2B Regulation, DSA, and DMA interact as a regulatory system.

What does the procedural path look like in practice – step by step?

A well-constructed unfair ranking complaint under EU rules follows a sequence, and each step informs the next. The path is not identical in every matter, but the structure is consistent enough to describe.

The first step is an evidence audit: the seller gathers its ranking position data, listing-level metrics, and account health records across a relevant window before and after the ranking change. The goal is to establish a baseline, document the change, and identify any correlating events – a policy update, a competitor complaint, a system change communicated by Amazon.

The second step is a review of Amazon's disclosed ranking parameters. The Business Solutions Agreement and the linked help pages contain the platform's stated ranking criteria. The question is whether the ranking outcome is explicable within those stated criteria. If it is not – or if the relevant criteria were not disclosed at all – the seller has a factual foundation for the complaint.

The third step is the internal complaint itself. This is a formal written communication to Amazon under the P2B Regulation's complaint mechanism. It should identify the legal basis, the factual pattern, and the remedy sought. It should not be a Seller Central support ticket. It is a document addressed to the platform's regulatory compliance function, and the seller should preserve a copy and the record of when it was sent.

The fourth step depends on the platform's response. Where the response is substantive and addresses the factual concern, the seller evaluates whether the explanation is consistent with the disclosed criteria. Where the response is generic or absent, the seller has a documented failure to engage – which is itself relevant to regulatory escalation or civil proceedings.

The fifth step, where escalation is warranted, is a regulatory complaint to the Italian Digital Services Coordinator or another relevant national authority, or a referral to a mediation body. The P2B Regulation requires platforms to identify at least two mediators in their terms and conditions. Mediation is voluntary for the seller; a mediation referral can produce a resolution without litigation. It is not always the right route, but it is often faster and less costly than court proceedings.

Civil litigation in Italy under the P2B Regulation's private enforcement provisions is the backstop. It is resource-intensive and slow. In our practice, it is the route of last resort for ranking disputes, and in most matters we handle, the internal complaint combined with regulatory pressure produces a clearer result in a fraction of the time.

What are the seller's real decision points – and what are the trade-offs?

Is there a quick fix? Not usually. A ranking complaint is a dispute about how the platform's system has treated your business. It is not a switch that, once pulled, restores a position. The realistic options each carry a different time cost and risk profile, and understanding those trade-offs is the core of the strategic decision.

The internal complaint alone is the lowest-cost, lowest-risk route, and the right starting point in almost every matter. The seller retains all escalation options while the complaint is pending. If it produces a credible response, the seller gains information even if the position is not immediately restored. If it produces nothing, the seller has documented the platform's failure to engage, which is useful in subsequent steps.

Regulatory escalation changes the dynamics of the matter. It involves a public authority, and it imposes regulatory scrutiny on the platform – which is, for the platform, a cost. That cost can produce movement in the seller's matter even where the regulatory authority does not directly order a remedy. The risk for the seller is that regulatory timelines are not fast, and regulatory bodies exercise discretion about which complaints they pursue. A well-framed complaint on a systemic or repeated pattern of conduct is more likely to attract attention than a single-instance ranking shift.

Mediation under the P2B Regulation's framework offers a middle path: faster than litigation, more direct than regulatory escalation, and with the possibility of an agreed resolution. Its limitation is that the platform must be willing to engage with the mediator's process in good faith. In our experience, mediation works best where the seller's factual case is clearly documented and the complaint is specific.

Civil litigation is the tool for cases where the other mechanisms have failed and the commercial stake justifies the investment. A seller with a significant volume of affected listings and a documented pattern of non-compliant ranking treatment has a stronger case for litigation than a seller with a single affected ASIN and no comparative data. The decision matrix, in plain terms, runs like this: if the ranking issue is isolated and recent, the internal complaint is the right opening move, typically resolved over several weeks. If it is systemic and the platform's response is inadequate, regulatory escalation and mediation run in parallel, on a timeline of several months. If escalation has produced no result and the stake is material, litigation is the backstop.

Consider what happened to an Italian mid-market electronics accessories seller on Amazon IT in the fall of 2025. The seller's top-selling listings dropped several positions in organic search over a period of days, with no change to pricing, ratings, or inventory levels. We reviewed the disclosed ranking parameters, documented the shift through the seller's Seller Central data, and filed a formal internal complaint under the P2B Regulation. Amazon's compliance function responded with a position that acknowledged the change but attributed it to a system-wide update. We pressed for the specific parameters applied and the relative weighting, consistent with the disclosure obligation. The seller's position was partially restored, and the complaint record provided the foundation for a subsequent mediation referral on the remaining listings. The matter resolved without litigation.

A second illustrative pattern: a food and grocery seller on Amazon DE (spring 2026) found that a competitor's comparable product was consistently ranked above its own, despite the seller's superior ratings and more competitive pricing. The seller believed this reflected a self-preferencing issue as well as a ranking-transparency problem. In that matter, the ranking complaint was filed alongside a DMA referral, and the two tracks ran in parallel. The DMA angle added regulatory complexity but was appropriate to the facts. For UK-specific parallel situations that arose after Brexit, our analysis of how to handle a UK marketplace suspension after Brexit on Amazon UK explains how the post-Brexit regime differs from the EU framework.

How does self-preferencing intersect with unfair ranking on Amazon IT?

Self-preferencing – the practice of a platform promoting its own products, brands, or services above those of third-party sellers in rankings or other forms of presentation – sits at the intersection of ranking transparency and the DMA's gatekeeper obligations. On Amazon IT, where Amazon operates as both a marketplace operator and a first-party retailer, the distinction between algorithmic ranking and deliberate self-preferencing is not always visible to the seller.

The DMA's core obligation relevant here is that a gatekeeper – and Amazon is a designated gatekeeper for several of its core platform services – must not treat its own products or services more favorably than similar products or services of third parties in ranking. That obligation operates alongside, and in some respects strengthens, the P2B Regulation's ranking-disclosure requirements. Where a seller's factual pattern suggests that the ranking disadvantage correlates with Amazon's own first-party listings benefiting, the self-preferencing dimension of the complaint becomes relevant.

It is worth being precise about what "relevant" means here. A seller cannot simply assert self-preferencing because a competitor's product ranks above its own. The factual case requires comparative data: ranking position across a sufficient number of searches, the identity of the products benefiting, and evidence that the ranking outcomes are not explained by the disclosed parameters. That is a more demanding evidentiary threshold than a pure P2B ranking-transparency complaint, but the regulatory consequence of a successful DMA complaint is also more substantial.

In matters we handle that involve both a ranking-transparency claim and a potential self-preferencing issue, we assess the two strands separately before deciding whether to advance both in parallel or to sequence them. The P2B internal complaint is almost always the first step regardless, because it produces documentary evidence that is useful across all of the subsequent options. The DMA strand is added where the facts support it, not as a matter of course.

What EU sellers often misunderstand – and the myth that stops them acting

A common and costly misunderstanding among sellers on Amazon IT is that EU rules give sellers procedural rights on paper but no real commercial effect. The logic runs: the platform is enormous, the complaint process is slow, and the seller will be tied up in a dispute while the revenue loss compounds. So the seller does nothing, or adjusts its strategy around the ranking problem, treating it as a fact of marketplace life.

That reasoning is understandable, but it reflects the pre-regulatory reality, not the current one. The P2B Regulation has been in force long enough that the major platforms have compliance functions that respond to well-constructed formal complaints in a different way from ordinary Seller Central support tickets. Amazon's regulatory exposure under the DSA – where VLOP enforcement by the European Commission carries significant consequences – gives the internal complaint a leverage that a simple support request does not have.

The myth that EU sellers have no leverage once a platform disadvantages their ranking is not accurate. The leverage is procedural and regulatory, not algorithmic. A seller cannot compel Amazon to change its algorithm. What it can do is document a breach of the platform's own disclosure obligations, file a complaint that the compliance function must engage with, and – where the platform's response is inadequate – escalate to a regulatory authority that has real enforcement tools. Those tools include, at the VLOP level, the Commission's ability to impose significant fines and to require behavioral remedies.

The condition for that leverage to work is specificity and documentation. A vague complaint about a ranking drop produces a vague response. A precise, evidence-based complaint that identifies the specific parameter-disclosure shortfall and the timeline of the ranking change gives the platform a substantive obligation to answer. In our practice, we see the difference in outcomes between these two approaches consistently – which is why the quality of the initial complaint document is the single most important factor in how a ranking complaint resolves.

Related areas

• EU Marketplace Regulation – DSA, DMA, P2B compliance and enforcement for Amazon and EU platform sellers
• Amazon Account Reinstatement – policy and performance deactivation appeals, Plan of Action and account-level disputes
• Frozen Funds Recovery – disbursement holds, account-level reserves, and FBA reimbursement claims

If a first attempt to resolve a ranking issue through Seller Central has produced no result, or if the platform's response to a formal complaint has been generic or absent, the next step is a reviewed assessment of what procedural options remain. A second read of the complaint and the platform's response often identifies the specific gap that is keeping the matter open – and what, if anything, can be advanced from here. To discuss your account situation with a member of the team, email info@tutamenlaw.com.

Frequently asked questions about unfair ranking complaints under EU rules

How long does resolving unfair ranking complaint under eu rules usually take on Amazon IT?

The timeline depends on which procedural path the seller uses and how substantively the platform engages. An internal complaint under the P2B Regulation typically draws a response within several weeks, though the quality of that response varies. Regulatory escalation to a Digital Services Coordinator or a mediation referral operates on a timeline of several months. Civil litigation is the longest route. In many matters we handle, a well-framed internal complaint combined with targeted regulatory pressure produces meaningful movement faster than sellers expect – but there is no fixed timeline that applies universally, and the seller should plan for a process measured in weeks to months rather than days.

What are the main risks if I handle unfair ranking complaint under eu rules alone?

The primary risk is filing a complaint that does not engage with the platform's legal obligations specifically enough to require a substantive response. A complaint that describes the ranking drop without connecting it to the disclosed ranking parameters gives the platform little to answer. A second risk is missing the evidentiary window: ranking position data is dynamic, and documentation needs to happen close to the event. A third risk is escalating too quickly or to the wrong authority, which can consume time and credibility without producing the regulatory pressure the seller intended. Each of these mistakes is recoverable, but each costs time – which is the seller's most limited resource when revenue is falling.

Do I need a lawyer for unfair ranking complaint under eu rules?

Legal representation is not a formal requirement for an internal P2B complaint or a regulatory complaint to a Digital Services Coordinator. But the quality of the complaint document is the dominant factor in whether the process produces a result, and drafting a complaint that identifies the specific regulatory obligation at issue, the factual breach, and the remedy sought in precise legal terms is a different task from writing a Seller Central support message. In matters we handle, attorney-led complaints consistently produce more substantive platform responses than self-filed complaints do. Whether you need a lawyer depends on the commercial stake in the matter and the complexity of the factual pattern – but the cost of a legal review is generally small relative to the revenue at risk in a sustained ranking displacement.

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. Our EU marketplace practice includes P2B Regulation complaints, DSA and DMA enforcement strategy, ranking and self-preferencing challenges, and suspension and delisting defense for sellers on Amazon IT, DE, FR, ES, UK and beyond. English and Russian are available on request. To discuss your situation, email info@tutamenlaw.com.

Byline: Claire Donnelly – arbitration & disputes analyst, 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.