Introduction
Digital platforms have become one of the most important areas of Turkish Competition Law. Online marketplaces, search engines, app stores, social media networks, online advertising platforms, food delivery applications, payment systems, travel platforms, streaming services, software ecosystems and e-commerce infrastructures now shape how businesses reach customers and how consumers access goods and services. These platforms create efficiency, innovation and convenience, but they also create complex competition law risks.
The main legislation is Law No. 4054 on the Protection of Competition. The purpose of this law is to prevent agreements, decisions and practices that restrict competition in goods and services markets, prevent abuse of dominant position, and regulate mergers and acquisitions that may significantly lessen competition in Turkey.
Digital platform cases are not limited to traditional cartel conduct. They may involve data access, algorithmic pricing, self-preferencing, discriminatory ranking, platform neutrality, exclusivity, most-favored-nation clauses, online advertising power, seller dependency, ecosystem lock-in, app store rules, marketplace restrictions and acquisitions of potential competitors. The Turkish Competition Authority has also launched a Competition Policies in the Digital Age study in 2026 to identify existing and potential competition issues in digital markets and evaluate possible intervention tools.
For companies operating digital platforms in Turkey, competition law compliance should be built into the business model from the beginning. Platform rules, seller agreements, ranking systems, data policies, advertising products, payment obligations, API access, merger strategies and user terms should all be reviewed under Turkish Competition Law.
1. Why Digital Platforms Raise Special Competition Law Issues
Digital platforms are different from traditional markets because they often operate as intermediaries between multiple user groups. An online marketplace connects sellers and consumers. A search engine connects users, websites and advertisers. An app store connects developers and device users. A food delivery platform connects restaurants, couriers and customers. A social media platform connects users, advertisers, content creators and business accounts.
These multi-sided structures may create strong network effects. As more users join a platform, the platform becomes more valuable for other users. A marketplace with many buyers attracts more sellers; more sellers attract more buyers. This feedback loop can make successful platforms grow rapidly and make it difficult for new entrants to compete.
The Turkish Competition Authority has recognized that abuse of dominance matters in digital markets have increased significantly and form an important part of its enforcement workload. This is because digital platforms may gain durable market power through data, user base, network effects, switching costs, default settings, logistics integration, payment systems, advertising tools and ecosystem control.
2. The Legal Framework: Articles 4, 6 and 7 of Law No. 4054
Digital platform conduct in Turkey is mainly assessed under three provisions of Law No. 4054.
Article 4 prohibits agreements, concerted practices and decisions of associations of undertakings that restrict competition. In digital markets, this may cover algorithmic coordination, information exchange between sellers, platform-facilitated collusion, resale price maintenance, marketplace restrictions, parity clauses and anti-competitive vertical agreements.
Article 6 prohibits abuse of dominant position. This is highly relevant for large platforms that may control access to users, sellers, data, advertising inventory, app ecosystems or digital infrastructure.
Article 7 regulates mergers and acquisitions that may significantly lessen effective competition. This is especially important for acquisitions of startups, digital services, online marketplaces, data-rich companies and potential competitors.
Law No. 4054 also allows administrative fines for violations of Articles 4, 6 and 7, and such fines may reach up to 10% of annual gross revenues depending on the infringement and circumstances.
3. Platform Dominance in Turkish Competition Law
Dominance is not illegal by itself. A digital platform may become successful because it offers better technology, lower prices, secure payment systems, faster logistics, better user experience or superior innovation. Turkish Competition Law does not punish success. However, a dominant platform has a special responsibility not to abuse its market power.
In digital markets, dominance cannot be assessed only by looking at market share. Other factors are equally important. These include network effects, data accumulation, switching costs, user lock-in, multi-homing restrictions, control over algorithms, access to advertisers, platform dependency, default status, interoperability restrictions and ecosystem integration.
For example, a platform may not have a traditional monopoly, but sellers may still depend on it because it controls access to a large customer base. Similarly, users may remain locked into a platform because of saved data, user history, ratings, social connections, subscriptions, app compatibility or payment infrastructure.
The Turkish Competition Authority’s work on digital transformation emphasizes that digitalization creates new competition law challenges involving data, market power, platform dependency and regulatory intervention tools.
4. Data as a Source of Market Power
Data is one of the most important sources of competitive advantage in digital markets. Platforms collect and process large amounts of user and business data, including search behavior, purchase history, product views, seller performance, conversion rates, advertising metrics, location data, reviews, payment behavior, logistics data and consumer preferences.
Data may improve services and create efficiencies. It can help platforms personalize recommendations, detect fraud, improve logistics, optimize search results and deliver better advertising. However, data can also strengthen market power. A platform with exclusive access to large datasets may improve its services faster than competitors, target customers more effectively and make entry more difficult.
Competition law concerns may arise where a dominant platform uses non-public business user data to compete against those users. For example, an online marketplace that hosts independent sellers and also sells its own products may have access to sensitive seller data. If the platform uses that data to identify profitable products, copy seller strategies or give preferential treatment to its own products, Article 6 concerns may arise.
Data-related competition risks are separate from personal data protection issues. A data practice may comply with privacy law but still raise competition concerns if it excludes competitors, strengthens dominance or harms business users.
5. Self-Preferencing by Digital Platforms
Self-preferencing occurs when a platform gives preferential treatment to its own products, services or affiliates over independent business users. This is one of the most important competition law issues in digital markets.
Self-preferencing may occur through search ranking, product placement, recommendation systems, advertising visibility, commission structures, logistics advantages, access to data, payment integration, default settings or technical interoperability. A marketplace may place its own products above independent sellers. A search engine may favor its own comparison service. An app store may favor its own applications. A platform may provide better analytics or advertising tools to its affiliated sellers.
The legal issue is not simply whether the platform promotes its own services. The issue is whether a dominant platform uses its gatekeeper position to distort competition in downstream or adjacent markets. Where business users depend on the platform, self-preferencing may reduce consumer choice, weaken independent sellers and discourage innovation.
Turkish Competition Authority materials on digital transformation and digital markets show that the Authority closely examines platform conduct, data advantages and ecosystem leverage in digital sectors.
6. Online Marketplaces and Seller Dependency
Online marketplaces are particularly important in Turkish digital competition law. Sellers often rely on large marketplaces to reach consumers, benefit from logistics infrastructure, access payment systems, participate in campaigns and use advertising tools. This dependency may give the platform significant bargaining power.
Competition law concerns may arise if the platform imposes unfair seller terms, discriminates between sellers, suspends accounts without objective reasons, changes ranking rules without transparency, forces sellers to use its logistics or payment services, restricts multi-homing or uses seller data to compete against sellers.
A fair marketplace governance system should include transparent criteria for seller access, suspension, ranking, campaign participation, commission changes, advertising visibility and data usage. The more important the marketplace is for sellers, the more important objective and non-discriminatory platform rules become.
7. Platform Rules and Discrimination
Digital platforms usually need rules to operate safely and efficiently. They may regulate product listings, prohibited goods, seller ratings, delivery standards, return policies, advertising content, payment conditions and consumer protection obligations. Such rules are not automatically anti-competitive.
However, platform rules may become problematic if they are applied selectively, used to favor affiliated businesses, or designed to exclude certain competitors. Discrimination may occur where similar sellers are treated differently without objective justification. For example, a platform may give better visibility, lower commissions or faster logistics access to its own affiliate while imposing stricter rules on independent sellers.
Article 6 of Law No. 4054 may become relevant if the platform is dominant and its discriminatory conduct distorts competition. Article 4 may also become relevant if platform rules are part of restrictive agreements with business users.
8. Most-Favored-Nation and Parity Clauses
Most-favored-nation clauses, also called parity clauses, are common in digital platform contracts. They may require sellers not to offer lower prices or better conditions on other platforms or their own websites.
A wide parity clause may prevent sellers from offering better prices on any other platform. A narrow parity clause may prevent sellers from offering better prices on their own websites. These clauses may reduce price competition, make entry harder for new platforms, increase commission levels and restrict sellers’ commercial freedom.
In digital markets, parity clauses are particularly sensitive because platforms may already benefit from network effects and seller dependency. If a leading platform prevents sellers from offering better prices elsewhere, competing platforms may struggle to attract users through lower commissions or better seller terms.
A platform using parity clauses in Turkey should assess market power, scope, duration, commercial justification and impact on inter-platform competition. Broad parity obligations imposed by a powerful platform may be especially risky.
9. Algorithmic Pricing and Platform-Facilitated Coordination
Algorithms are widely used in digital markets. They can adjust prices, manage inventory, recommend products, place ads, match users, calculate delivery fees and rank search results. Algorithms can increase efficiency, but they can also create competition law risks.
Algorithmic pricing may become problematic if competing sellers use the same pricing tool in a way that facilitates coordination. It may also be risky if a platform shares sensitive pricing information among sellers or designs tools that encourage price alignment.
Competition law does not require a traditional secret meeting to find coordination. If independent commercial decision-making is replaced by algorithmic alignment, Article 4 risks may arise. The key question is whether the algorithm supports lawful unilateral pricing or unlawful coordination.
Digital platforms should review pricing tools, seller dashboards, data-sharing systems and automated recommendations to ensure that they do not facilitate collusion among sellers.
10. Hub-and-Spoke Risks in Digital Platforms
Hub-and-spoke coordination occurs when a central actor facilitates coordination between competing undertakings. In digital markets, the platform may act as the hub, while sellers are the spokes.
For example, if competing sellers use a platform to exchange future price information, or if the platform communicates one seller’s pricing strategy to another, this may create coordination risk. Similarly, if a supplier uses a marketplace to monitor and discipline discounting sellers, the platform environment may support resale price maintenance or indirect coordination.
Platforms should avoid transmitting competitively sensitive information between sellers. Seller dashboards should be designed carefully. Aggregated data may be less risky, but real-time, non-public and seller-specific data can create serious competition concerns.
11. Resale Price Maintenance in Digital Platform Markets
Resale price maintenance is a major risk in online commerce. Suppliers may monitor marketplace prices and pressure online sellers not to discount. This may occur through warnings, stock limitations, bonus reductions, threats of termination or campaign exclusion.
In digital markets, RPM is easier to detect because prices are publicly visible. However, it is also easier to enforce because suppliers can use automated monitoring tools. A supplier may not impose fixed or minimum resale prices on independent resellers. Recommended prices may be used only if they remain genuinely non-binding.
Digital platforms should also avoid becoming instruments of RPM. If a platform helps suppliers identify discounting sellers or enforces minimum resale prices, it may become involved in competition law risk.
12. Online Advertising Platforms
Online advertising is another major competition law area. Search advertising, social media advertising, display advertising, video advertising, ad exchanges and programmatic advertising systems may involve complex relationships between advertisers, publishers, intermediaries and platforms.
Competition concerns may arise where a platform controls both the demand side and supply side of advertising, operates an ad exchange, controls measurement tools and competes in adjacent advertising markets. Issues may include self-preferencing, lack of transparency, discriminatory access, tying, data advantages and conflicts of interest.
The Turkish Competition Authority has published an online advertising sector inquiry preliminary report, showing that online advertising is a distinct area of regulatory attention in Turkey.
13. App Stores and Software Ecosystems
App stores and software ecosystems raise specific competition law concerns. A platform may control access to users, impose commission fees, set technical rules, determine ranking, approve or reject applications, require use of its payment system or restrict alternative distribution channels.
Competition law concerns may arise if an app store discriminates against competing apps, uses confidential developer data, ties payment services to app distribution, imposes excessive commissions, restricts interoperability or prevents users from switching.
The legal assessment depends on market definition, platform power, developer dependency, consumer alternatives, technical justification and competitive effects. A platform may impose security and quality rules, but those rules should be objective, proportionate and non-discriminatory.
14. Digital Platforms and Merger Control
Mergers and acquisitions involving digital platforms may require notification to the Turkish Competition Authority if the relevant turnover thresholds and control conditions are met. Digital transactions may raise special issues even where the target has limited turnover because the target may be an emerging competitor, data-rich business, innovative technology provider or potential market disruptor.
The Turkish Competition Authority has considered potential competition especially important in digital and technology sectors. Its materials on potential competition refer to e-marketplace sector inquiry findings and concerns about entry barriers in platform markets.
Foreign investors acquiring Turkish digital businesses, fintech companies, online marketplaces, software platforms, data analytics businesses or advertising technology companies should conduct Turkish merger control analysis early. Closing a notifiable transaction without approval may create gun-jumping risk.
15. Digital Platforms and Abuse of Dominance
Abuse of dominance in digital platforms may take many forms. These include refusal to provide access, discriminatory ranking, tying, bundling, self-preferencing, unfair commission terms, excessive data extraction, exclusivity obligations, restricting interoperability, predatory pricing, margin squeeze and leveraging dominance into adjacent markets.
A dominant platform may defend certain practices by showing objective justification. For example, security, fraud prevention, data protection, product quality, technical integrity or consumer safety may justify some platform rules. However, the justification must be credible, proportionate and applied consistently.
The central question is whether the platform competes on the merits or uses its gatekeeper position to distort competition.
16. Commitments and Remedies in Digital Platform Cases
Digital platform investigations may be resolved through commitments in suitable cases. Commitments may involve changing platform rules, improving transparency, removing restrictive clauses, providing data access, modifying ranking criteria, ending discriminatory practices or creating compliance reporting mechanisms.
The Turkish Competition Authority has emphasized commitment and settlement mechanisms as tools for efficient enforcement in competition law matters.
However, commitments must be specific and capable of eliminating the competition concern. A general promise to comply with competition law is not enough. Digital platform commitments often require technical implementation, monitoring and internal governance changes.
17. Administrative Fines and Enforcement Risk
Digital platforms that violate Turkish Competition Law may face significant administrative fines. Law No. 4054 allows fines for conduct prohibited under Articles 4, 6 and 7, and fines may reach up to 10% of annual gross revenues depending on the infringement.
In addition to fines, the Competition Board may order the company to terminate unlawful conduct, revise contracts, change platform practices, remove restrictions, provide access or implement commitments. For digital platforms, such measures may be commercially significant because they can affect core business design.
This is why competition law review should occur before launching a platform feature, changing seller rules, integrating services, using seller data, changing rankings or acquiring a competitor.
18. Competition Compliance for Digital Platforms in Turkey
Digital platforms need specialized competition compliance programs. A general antitrust policy designed for traditional markets may not be enough.
A platform compliance program should cover:
Seller access and suspension criteria.
Ranking and recommendation algorithms.
Use of seller and consumer data.
Self-preferencing risks.
Advertising transparency.
Parity and exclusivity clauses.
API access and interoperability.
App store or marketplace rules.
Algorithmic pricing tools.
Resale price maintenance risks.
Merger control screening.
Dawn raid preparedness for digital data.
Employee training for product, data, sales, legal and engineering teams.
The compliance program should be practical. Engineers, product managers and category teams should understand how competition law applies to design decisions. Legal review should not be limited to contracts; it should also include technical and operational practices.
19. Practical Contract Drafting Tips for Digital Platforms
Platform agreements should be clear, objective and proportionate. Seller terms should explain commission rules, ranking criteria, data use, suspension grounds, advertising conditions, payment obligations and logistics requirements.
Parity clauses should be avoided or narrowly drafted after legal review. Exclusivity obligations should be justified and limited. Platform access criteria should be non-discriminatory. Data use provisions should clearly distinguish between data needed to operate the platform and data used to compete against business users.
If the platform sells its own products, internal rules should prevent unfair use of non-public seller data and discriminatory ranking. If the platform provides advertising services, transparency rules should explain how sponsored results and organic results are distinguished.
20. Future Direction of Digital Competition Law in Turkey
Digital competition law in Turkey is evolving. The Turkish Competition Authority’s 2026 digital age study shows that digital markets remain a current policy priority. The study aims to identify existing and potential competition problems and evaluate intervention tools for digital markets.
This suggests that companies should expect continued scrutiny of digital platforms, online marketplaces, online advertising, data use, algorithmic systems and acquisitions involving technology undertakings. Platform operators should not wait for enforcement action before reviewing their business models.
Conclusion
Digital platforms are now at the center of Turkish Competition Law. Law No. 4054 applies to online marketplaces, search engines, app stores, advertising platforms, payment systems, streaming services, social networks, software ecosystems and other digital intermediaries. The main legal risks arise under Article 4, Article 6 and Article 7.
The most important competition law issues for digital platforms in Turkey include platform dominance, network effects, data advantages, self-preferencing, discriminatory ranking, seller dependency, parity clauses, algorithmic coordination, online advertising power, app store rules, resale price maintenance, marketplace restrictions and acquisitions of potential competitors.
The Turkish Competition Authority has made digital markets a clear enforcement and policy priority. Its work on digital transformation, abuse of dominance in digital markets, online advertising and competition policies in the digital age demonstrates that platform conduct will remain under close scrutiny.
For digital platforms operating in Turkey, the safest approach is proactive compliance. Platform rules, data policies, algorithms, seller agreements, advertising systems, acquisition strategies and ecosystem integrations should be reviewed before they create legal exposure. A well-designed competition compliance program can reduce investigation risk, protect platform reputation, strengthen user trust and support sustainable growth in Turkey’s digital economy.
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