Cartels and Bid Rigging: Detection, Evidence and Liability in Türkiye

1) What evidence do antitrust authorities use to prove a cartel if there is no written agreement?

Antitrust authorities do not need to find a formal written agreement to establish a cartel. They may rely on communications between competitors, meeting records, emails, messages, pricing behaviour, customer or territory allocation, similar bidding patterns and economic analysis. However, parallel conduct alone may not always be sufficient; authorities usually look for additional supporting factors. 

2) How do competition authorities detect bid rigging in public and private tenders?

Authorities typically examine unusual bidding patterns, repeated or rotating wins by the same bidders, competitors declining to bid, similar prices, identical errors in documents or last-minute withdrawals. In public tenders, procurement data may be screened; in private tenders, complaints, whistleblower reports, internal documents, dawn raids and information requests may be more important. Some investigations also begin following leniency applications. 

3) Which types of information exchange between competitors may constitute an antitrust violation?

The exchange of competitively sensitive information may create antitrust risk, especially where it concerns prices, discounts, costs, margins, production volumes, customer lists, territories, future strategies or tender plans. The risk is higher where the information is current or future-oriented, detailed, non-public and exchanged directly between competitors. Even a one-off exchange may be problematic if it affects independent decision-making in the market. 

4) What types of interactions with competitors are permissible under antitrust laws, and where is the line drawn between legitimate cooperation and unlawful coordination of competitive conduct?

Not every contact with competitors is unlawful; industry associations, technical standard-setting, regulatory discussions or objectively pro-competitive joint projects may be permissible under certain conditions. However, the risk begins where the purpose or effect of the contact is to coordinate prices, customers, territories, output, bids or commercial strategy. The key test is whether companies continue to make their market decisions independently. 

5) What are the most common red flags indicating possible bid rigging?

Common red flags include bid rotation, very close or artificial-looking bid prices, identical errors in different bids, some competitors regularly not bidding, or bidders submitting intentionally non-competitive offers. Subcontracting between winning and losing bidders, last-minute withdrawals or intensive pre-bid communications may also be warning signs. These indicators do not prove an infringement on their own, but they usually justify a closer legal and factual review. 

6) What liability may a company and its executives face for participation in a cartel or bid-rigging arrangement?

Participation in a cartel or bid-rigging arrangement may expose the company to administrative monetary fines of up to 10% of the annual gross revenue taken as basis under Law No. 4054 on the Protection of Competition. Managers or employees who had a decisive influence on the infringement may also face individual administrative fines of up to 5% of the fine imposed on the company. Agreements or concerted practices restricting competition are legally invalid and may also give rise to private damages claims, including enhanced damages in appropriate cases. In public procurement matters, criminal liability may also arise if the elements of bid rigging under Turkish criminal law are met.

7) Could participation in industry associations, working groups, or market information exchange forums give rise to antitrust risks?

Participation in industry associations, working groups, or market information forums is not prohibited in itself. However, these platforms may create serious risks under Article 4 of Law No. 4054 if competitors exchange competitively sensitive information such as current or future prices, output, capacity, costs, customers, territories, or tender strategies. A participant who remains in a meeting where such topics are discussed without clearly objecting or distancing itself may face evidentiary risk. The assessment depends on the nature of the information, the market structure, and the context of the exchange.

8) What should a company do if it discovers potential cartel conduct during an internal audit or investigation?

If a company discovers potential cartel conduct during an internal audit or investigation, it should immediately preserve relevant documents and avoid any destruction, alteration, or informal clean-up of records. Ongoing suspicious contacts with competitors should be stopped, and the matter should be escalated to legal and compliance teams, preferably with external competition counsel. The company should also assess quickly whether an application under the Turkish active cooperation / leniency mechanism is available. Timing is critical, because immunity or reduction of fines depends on strict conditions, the quality of evidence submitted, and cooperation with the Competition Authority.

9) Are there any leniency or cooperation programs that allow companies to reduce or avoid penalties?

Yes. Turkish law provides an active cooperation / leniency mechanism for cartel cases under Law No. 4054 and the Regulation on Active Cooperation in the Detection of Cartels. The first eligible applicant may obtain full immunity from administrative fines if it submits the required information and evidence in time and satisfies the applicable conditions. Later applicants may receive reductions in fines if they provide added value, end their participation in the cartel, and cooperate continuously with the Competition Authority. Managers and employees may also benefit from immunity or reductions, depending on their cooperation and the scope of the application.

10) What elements should an effective antitrust compliance program include to minimize cartel risks?

An effective antitrust compliance program should be tailored to the company’s sector, size, and risk profile. It should include clear senior management commitment, written rules on competitor contacts, tender participation, information exchange, pricing, customers, territories, and capacity-related discussions. Regular role-based training, controls for trade association meetings, monitoring, internal reporting channels, and disciplinary measures are also important. The program should also contain practical procedures for dawn raids, internal investigations, and rapid assessment of possible leniency applications.

Author: Aigerim Sabit Bikmaz and Esra Dicle Bağlı; Ali Ceylan and Gülendam Tüylüoğlu