Anticompetitive Agreements and Cartels in Türkiye: What Article 4 Prohibits
In Türkiye, agreements between competitors that fix prices, carve up markets, rig tenders or limit output are prohibited and legally void under Article 4 of the Act on the Protection of Competition No. 4054 (Rekabetin Korunması Hakkında Kanun). These are the conduct types regulators call "cartels", and they carry the heaviest exposure in Turkish competition law. What surprises many foreign companies is how wide the net is: you do not need a signed contract, a Turkish office, or even an intention to harm anyone. A handshake at a trade-association dinner, a shared pricing spreadsheet, or a quiet understanding not to bid against a rival can all be caught. This guide explains what Article 4 actually covers, where lawful cooperation ends and an illegal cartel begins, and why companies operating in or selling into Türkiye should treat this as a board-level risk rather than a footnote.
What Article 4 of Law No. 4054 Actually Prohibits
The core rule is short. Article 4 of the Act on the Protection of Competition No. 4054 (Rekabetin Korunması Hakkında Kanun) prohibits agreements between undertakings, concerted practices, and decisions of associations of undertakings that have the object or effect of preventing, restricting or distorting competition in a market for goods or services within Türkiye. Crucially, the same article states that such arrangements are legally void — they cannot be enforced before a Turkish court.
Three words in that sentence do a lot of work, so it helps to translate them into plain terms:
- Undertaking (teşebbüs) — any person or company that carries on an economic activity. It is broader than a single legal entity and can capture a whole corporate group acting as one economic unit.
- Agreement (anlaşma) — any meeting of minds. It does not have to be a signed, formal contract. An email chain, a verbal understanding, or even a "gentlemen's agreement" can qualify.
- Concerted practice (uyumlu eylem) — coordination that falls short of a true agreement but still replaces the risks of competition with practical cooperation. This is how the authorities reach informal collusion that was never written down.
The law is enforced by the Turkish Competition Authority (Rekabet Kurumu), whose decision-making body is the Competition Board (Rekabet Kurulu). The framework deliberately tracks EU competition rules (Article 4 mirrors Article 101 TFEU), which makes it familiar to many international businesses — but Turkish enforcement has its own priorities and its own procedural traps.
"Concerted Practice": Why You Do Not Need a Written Contract
This is the point foreign companies most often miss. Turkish competition law does not require a smoking-gun document to find a violation. The concept of a concerted practice (uyumlu eylem) exists precisely to catch coordination that competitors are careful never to put in writing.
In practice, the authorities look at how rivals behave in the market. If competitors move in unusual lockstep — raising prices by the same amount at the same time, or all withdrawing from a region together — and that parallel behaviour cannot be explained by normal market forces, it can support an inference of unlawful coordination. The law in this area also contains a presumption that eases the regulator's task: where price or market behaviour resembles what you would expect from a coordinated market, the burden can shift to the companies to show their conduct was independent.
The most common gateway to a concerted-practice finding is information exchange. Sharing competitively sensitive data with a rival — future prices, planned capacity, costs, customer lists, bidding intentions — can itself breach Article 4, even with no agreement on what to do next. The risk is just as real when the data travels indirectly: through a trade association, a shared distributor, a consultant who advises several competitors, or a common online platform. This is often called a "hub-and-spoke" structure, where a shared intermediary becomes the channel through which rivals align.
The Hardcore Restrictions: Cartels in Detail
Some restrictions are treated as so harmful that they are almost never tolerated. These "hardcore" restrictions are what most people mean by the word cartel — secret coordination between competitors that strips away the competition customers are entitled to. For these, the focus is on the conduct itself rather than a detailed economic effects analysis, and the chances of escaping liability are slim.
Price fixing
Agreeing prices, discounts, rebates, margins, surcharges, payment terms or any other element of price with a competitor. It does not matter whether the agreed price is ever actually charged — fixing the reference point is the violation.
Market and customer sharing
Dividing the market by geography ("you take the south, we take the north"), by customer type, or by product line so that competitors agree not to chase each other's territory or clients. Allocating customers or supply sources falls in the same category.
Bid rigging
Coordinating who wins a tender — through cover bids, bid suppression, bid rotation, or agreeing not to compete on a particular contract. This is an enforcement priority in Türkiye, especially in public procurement, and a rigged bid can trigger competition liability on top of procurement and criminal consequences.
Output and capacity restriction
Agreeing to limit production, supply, investment or technical development in order to keep prices up or keep a rival out. Coordinated limits on quantity are treated as seriously as coordinated prices.
Labour-market collusion: a newer front
Agreements between employers not to hire each other's staff (no-poach) or to align wages and benefits (wage-fixing) are now treated as labour-market cartels under Article 4. These clauses often hide in commercial, franchise or shareholder agreements where no one was thinking about competition law at all, which makes them a particular trap for foreign groups importing template contracts from abroad.
Where Lawful Cooperation Ends and a Cartel Begins
Not every arrangement between competitors is illegal. Turkish competition law recognises that businesses cooperate for good reasons, and that some cooperation makes markets more competitive, not less. The difficulty is that the same activity can be perfectly lawful in one form and a cartel in another — the line is genuinely fact-specific.
Cooperation that is often legitimate includes:
- Joint research and development that brings products to market faster or cheaper;
- Joint purchasing that genuinely lowers input costs and passes savings on;
- Standard-setting and industry benchmarking, where data is aggregated, historical and anonymised rather than current and individualised;
- Distribution, agency and franchising arrangements between non-competitors;
- Genuine joint ventures that combine resources to do something neither party could do alone.
Two legal routes can take an arrangement outside the Article 4 prohibition. First, block exemptions issued by the Competition Authority give certain categories of agreement (for example, vertical distribution arrangements, R&D, and specialisation agreements) a "safe harbour" if they stay within defined conditions and market-share limits. Second, an arrangement that falls outside a block exemption may still qualify for an individual exemption under Article 5 of Law No. 4054 — broadly, where it produces real efficiencies, gives consumers a fair share of the benefit, does not eliminate competition and goes no further than necessary.
The de minimis Question: Are Small Arrangements Safe?
Turkish competition law includes a de minimis approach (sometimes called the insignificance principle), which allows the Competition Authority to decline to open an investigation into agreements whose effect on the market is minor. In plain terms, the regulator can choose not to spend resources chasing small arrangements between small players that do not meaningfully dent competition.
It is tempting to read that as "small deals are safe", but two cautions matter a great deal:
- Hardcore restrictions are carved out. The de minimis safety valve does not shelter cartel conduct — price fixing, market sharing, bid rigging and output limits stay prohibited regardless of how small the parties or their combined share are.
- It is discretionary, not a free pass. The principle lets the Authority decline to act; it does not declare the agreement lawful or immunise the parties. Market shares also move, and an arrangement that was minor last year can cross the line as a business grows.
Heavy Exposure for Foreign Companies Operating in Türkiye
Two features of the regime make Article 4 a serious risk for international businesses, even those that feel comfortably distant from Türkiye.
The law reaches conduct decided abroad
Under Article 2 of Law No. 4054, the prohibitions apply on an effects basis. Conduct agreed entirely outside Türkiye is still caught if it distorts competition inside a Turkish market. A foreign company with no Turkish subsidiary, signing nothing on Turkish soil, can be investigated and fined because the arrangement raised prices or restricted choice for Turkish customers. Foreign-to-foreign coordination is not beyond reach.
The financial and legal consequences are significant
The Competition Board can impose substantial administrative fines for breaches of Article 4, and the exposure is not limited to the company. Managers and employees who played a determining role in the conduct can face separate personal penalties. Beyond fines, the consequences include:
- Voidness: the offending agreement is legally void and unenforceable in Türkiye;
- Private damages claims: parties harmed by a cartel can sue for compensation, and Turkish law allows enhanced (multiple) damages in cartel cases, with a final Board decision carrying real evidential weight in any follow-on lawsuit;
- Dawn raids: the Authority can carry out unannounced on-site inspections, examining and copying physical and electronic records — and legal privilege in Türkiye is narrower than in the EU, so internal and in-house counsel communications are not reliably protected.
The structure of fines, leniency self-reporting, settlement and dawn-raid procedure is covered in our broader Turkish competition law compliance guide for foreign companies.
Practical Steps to Stay on the Right Side of Article 4
The most effective protection is prevention built into how your teams actually operate in Türkiye, rather than a policy document filed away at headquarters. A workable approach usually includes:
- Map your competitor contacts. Identify every point where your people meet rivals — trade associations, benchmarking exercises, joint ventures, shared suppliers or platforms — and set rules for what can and cannot be discussed.
- Lock down information exchange. Treat any competitor's current or future prices, capacity, costs and customer data as off-limits, in both directions.
- Review template contracts for hidden clauses. No-poach, wage-alignment, exclusivity and customer-allocation terms imported from foreign templates are a frequent source of unintended Article 4 risk.
- Train the people at risk. Sales, procurement, HR and senior commercial staff need practical, local-language guidance on what a casual conversation can turn into.
- Have a "leave the room" rule. Make clear that anyone faced with competitor talk about price, output, customers or wages must object on the record and disengage.
- Get cooperation agreements reviewed before signing. Anything that touches price, quantity or customer allocation between competitors should be assessed against the block-exemption and individual-exemption framework in advance.
How Lexin Legal helps
Lexin Legal advises foreign companies on the full sweep of Article 4 risk — pressure-testing cooperation, distribution and joint-venture arrangements, reviewing template contracts for hidden cartel clauses, designing compliance and dawn-raid protocols, and representing clients in investigations before the Competition Board. If you are planning cooperation with a competitor, have received a query from the Authority, or want to know whether an existing arrangement is safe, the time to involve counsel is before the next meeting or the next signature. To discuss your situation, see our Competition & Antitrust practice or contact our Istanbul office.
This article is general information about Turkish competition law and not legal advice. Competition assessments are highly fact-specific; obtain advice on your particular arrangement before acting.
Frequently asked questions
What is a cartel under Turkish competition law?
A cartel is secret coordination between competitors that distorts competition — typically price fixing, sharing markets or customers, bid rigging, or agreeing to limit output. These arrangements are prohibited under Article 4 of the Act on the Protection of Competition No. 4054 and are legally void. They are treated as the most serious form of competition-law breach and are pursued aggressively by the Turkish Competition Authority.
Does an anticompetitive agreement have to be in writing to be illegal in Türkiye?
No. Article 4 of Law No. 4054 catches not only formal written agreements but also informal understandings and "concerted practices" — coordination that falls short of a true agreement. A verbal understanding, an email exchange, parallel market behaviour that cannot be explained by normal competition, or simply exchanging sensitive information with a competitor can all amount to a violation, even without a signed contract.
Can a foreign company with no office in Türkiye be fined for a cartel?
Yes. Under Article 2 of Law No. 4054, the prohibitions apply on an effects basis: conduct agreed entirely abroad is still caught if it distorts competition in a Turkish market. A foreign company without any Turkish subsidiary can be investigated and fined where its arrangement raised prices or restricted choice for Turkish customers, including in foreign-to-foreign situations.
Is cooperation between competitors always illegal in Türkiye?
No. Genuine, pro-competitive cooperation — such as joint research and development, joint purchasing, standard-setting or distribution arrangements — can be lawful, and may benefit from a block exemption or an individual exemption under Article 5 of Law No. 4054. The line is fact-specific. Hardcore restrictions such as price fixing, market sharing, bid rigging and output limits generally cannot be rescued by these exemptions, so any cooperation touching price, quantity or customer allocation between competitors should be reviewed before it is put in place.
Are small companies exempt from the cartel rules under a de minimis threshold?
Turkish competition law includes a de minimis approach that lets the Competition Authority decline to investigate arrangements with only a minor effect on the market. But it is discretionary, not a declaration that the agreement is lawful, and it does not shelter hardcore restrictions: price fixing, market sharing, bid rigging and output limits remain prohibited regardless of how small the parties are. "We are too small to matter" is not a safe compliance strategy.
What information should we never share with a competitor?
Avoid sharing any competitively sensitive information, particularly current or future prices, discounts, costs, capacity or output plans, customer lists, and bidding intentions. Sharing such data can breach Article 4 as a concerted practice even without any agreement on what to do next, and the risk applies whether the information passes directly or through a trade association, shared distributor, consultant or common platform. If a competitor raises such topics, the safe response is to object clearly and disengage.
