Borsa Istanbul Chief Executive Korkmaz Enes Ergun has been detained in an expanding investigation into alleged bribery, organized criminal activity and manipulation involving investment funds and listed shares, bringing the inquiry into the leadership of Türkiye’s principal securities exchange. The detention, reported by the state-run Anadolu Agency on October 31, does not establish guilt, and no court judgment has been announced. Yet for international investors, the development raises a question larger than the allegations against any individual: whether Türkiye can demonstrate that its market-surveillance, disclosure and enforcement systems are sufficiently independent, transparent and predictable to support long-term foreign capital.
An Investigation Reaches the Exchange’s Leadership
Anadolu reported that the Istanbul Chief Public Prosecutor’s Office detained Ergun on suspicion of membership in an organization established to commit crimes and bribery. Public reporting had not, as of November 1, disclosed detailed evidence supporting the allegations or indicated whether Ergun had been formally charged. The distinction between detention, pretrial measures and conviction is important in assessing both the legal case and its market implications.
Ergun is not a peripheral figure in Türkiye’s financial infrastructure. According to Borsa Istanbul’s corporate biography, he has 28 years of exchange and capital-markets experience, has overseen the evaluation of numerous initial public offerings and the examination of listed companies, and serves as deputy chairman of settlement and clearing institution Takasbank. He is also a board member of the World Federation of Exchanges. He became Borsa Istanbul’s chief executive in 2021.
The exchange itself is a strategic state-linked institution. The Türkiye Wealth Fund controls 80.6 percent of Borsa Istanbul, according to the exchange’s ownership disclosures and contemporaneous reporting on Ergun’s appointment. That structure does not by itself imply interference in market operations, but it increases the importance of clearly separating ownership, regulation, exchange supervision and criminal enforcement.
The detention follows several weeks of widening scrutiny. Treasury and Finance Minister Mehmet Şimşek authorized an investigation into former Capital Markets Board, or SPK, Chairman İbrahim Ömer Gönül on October 14, based on a preliminary report by the ministry’s Inspection Board, Anadolu reported. Gönül led the SPK from April 2022 to April 2026. He previously told the Hürriyet newspaper that the regulator had audited and fined some of the funds under examination, while arguing that establishing manipulation can require months of evidence gathering.
The cases remain ongoing, and allegations against different suspects should not be treated as proven or identical. Nevertheless, scrutiny of both the exchange’s chief executive and a former head of the market regulator shifts the issue from misconduct among individual fund managers toward the effectiveness of institutional oversight.
From Redemption Failure to a Market-Wide Crisis
The investigation grew out of turmoil that became visible in September. According to an analysis by the law firm Gen Temizer Erdoğan Girgin, Pusula Portföy Yönetimi failed to meet redemption requests from certain investment funds on time. Similar liquidity problems emerged at Tera Portföy Yönetimi, contributing to selling in related shares and the broader market.
The BIST 100 fell 5.54 percent on September 16, triggering an index-linked circuit breaker, the firm reported. The disruption was especially significant because funds marketed as liquid investment vehicles had accumulated concentrated exposure to smaller listed companies whose genuinely tradable free float was difficult to verify.
On September 17, the SPK suspended trading in funds established by seven portfolio-management companies, Tera, Pusula, Hedef, Atlas, A1 Capital, Pardus and Bulls, and ordered the liquidation of approximately 130 funds. The regulator also temporarily permitted brokerage firms to reduce the minimum equity-maintenance ratio for margin trading from 35 percent to as low as 20 percent, subject to their own risk policies. The Financial Stability Committee held an emergency meeting that day.
The response later moved from administrative intervention to legislation. On October 27, the SPK announced procedures under Law No. 7596 governing the administration, liquidation and payment priorities of affected funds. The regulator said Ziraat Bank would handle the liquidation of Pusula and Atlas funds, while İşbank would administer the Tera funds. Money-market funds would receive priority for interim payments, which were capped by reference to net investment amounts and a limit of 1 million Turkish liras per investor and fund.
Justice Minister Akın Gürlek said on October 6 that 85 suspects had been detained, action had been taken against 207 people and assets had been frozen as investigators sought to distinguish legitimate returns from profits allegedly generated through rapid trading in “bubble stocks.” He said prosecutors had been examining data supplied by the SPK, Borsa Istanbul and the Central Securities Depository.
Those figures predated Ergun’s detention and underline the scale of the inquiry. They also expose the core technical problem: investment-fund holdings can appear dispersed at the legal-account level while remaining economically coordinated through common beneficial owners, related parties or aligned managers.
Index Providers Have Turned Governance Into a Capital-Flows Issue
The international consequences are no longer theoretical. On October 15, MSCI froze certain upward changes to its Türkiye equity indexes, including increases in Foreign Inclusion Factors, additions to the MSCI Turkey Investable Market Index and upward migrations between size segments.
MSCI said institutional investors had raised serious concerns about possible coordinated trading through funds closely affiliated with smaller listed companies. Such structures, it said, could undermine both free-float calculations and market integrity. Although Turkish authorities introduced a framework excluding some fund-held stakes from free float when the beneficial owner is already excluded, MSCI described these as initial measures requiring credible and sustained enforcement.
The index provider said it wants more granular and timely disclosure of beneficial ownership, stronger action against coordinated trading, and transparent rules for securities with structurally distorted free float. If sufficient progress is not evident by June 2027, MSCI may consult on moving Türkiye from emerging-market status to frontier or standalone status. Reuters noted that S&P Dow Jones Indices had also warned in July of a possible downgrade over transparency and related concerns.
A reclassification has not been decided. The immediate action is a freeze, not an exclusion. Even so, index treatment matters because passive and benchmark-sensitive funds allocate capital according to eligibility, weighting and accessibility criteria. A lower classification could reduce the pool of institutions able or willing to hold Turkish equities, raise liquidity premiums and increase the cost of equity capital for listed companies.
For strategic investors, the transmission channel is indirect but material. Foreign direct investment differs from short-term portfolio investment, yet an acquirer assessing a Turkish target often relies on market prices, comparable-company valuations and the prospect of a future public exit. If quoted prices or free-float measures are considered unreliable, valuation discounts can spread from the stock market into private mergers, minority investments and pre-IPO financing.
A Setback Against Improving Capital Indicators
The scandal comes after a period of renewed foreign interest. Türkiye’s Investment and Finance Office, citing central-bank balance-of-payments data, said the country attracted $13.1 billion in FDI during 2025, up 12.2 percent from 2024. Şimşek said non-real-estate FDI reached $10.7 billion, its highest level in a decade. Manufacturing accounted for $3.02 billion, while information and communications attracted $1.31 billion.
Capital-market participation was also expanding. Data compiled by the Turkish Capital Markets Association from the Central Securities Depository showed that foreign investors’ equity holdings rose 28.6 percent in 2025 to 2.71 trillion liras. Foreign investors owned 36.3 percent of the total equity portfolio at year-end when non-free-float shares were included.
Meanwhile, investment-fund portfolios reached 8.52 trillion liras and attracted approximately 5.72 million investors by the end of 2025, according to Central Securities Depository data reported by Türkiye Today. That rapid growth increased the importance of liquidity management, related-party controls and reliable valuation procedures.
The primary market also has significant capacity. The SPK recorded 18 initial public offerings in 2025, raising about $981 million, while roughly 150 applications were reportedly awaiting consideration entering 2026. Market-integrity concerns can delay that pipeline, particularly for smaller issuers whose float, governance and ownership relationships may receive more intensive scrutiny.
The immediate risk is therefore not simply a fall in an index. It is a higher governance premium across Turkish assets. Investors may demand more extensive warranties, lower acquisition multiples, escrow arrangements or stronger exit protections until the enforcement process clarifies where failures occurred and how recurrence will be prevented.
Due Diligence Must Extend Beyond the Target Company
Foreign investors considering listed stakes, acquisitions or joint ventures in Türkiye now need to examine connections that conventional financial due diligence can overlook. These include beneficial ownership behind nominee and fund accounts, relationships between issuers and portfolio managers, historical trading concentration, pledged shares, margin financing, redemption exposure and transactions involving related brokers.
Legal and tax compliance work must also assess whether targets, shareholders or intermediaries are subject to asset freezes, travel restrictions, SPK measures or prosecutorial inquiries. A transaction may remain commercially attractive while still requiring revised closing conditions, regulatory approvals or protections against the consequences of a later enforcement decision.
Market-entry analysis should distinguish between temporary volatility and structural weaknesses in a specific sector or ownership network. Company incorporation and corporate structuring can help isolate local operating risk, but structures must have genuine commercial substance and transparent beneficial ownership. Government-relations and regulatory-liaison work is relevant when investors need consistent communication with the SPK, Competition Authority, trade registries, ministries or sector regulators, particularly during transactions involving regulated businesses or public incentives.
Project management also becomes important after signing. Regulatory filings, governance appointments, banking arrangements, capital contributions and compliance systems must be coordinated on the ground. For manufacturing and trading investors, import-export operations and incentive applications remain separate from stock-market turbulence, but financing assumptions and counterparty selection may need to be retested.
What This Means for Foreign Investors
Ergun’s detention intensifies uncertainty at a sensitive moment, but it does not by itself determine the reliability of Türkiye’s entire investment environment. The more consequential test will be whether authorities publish verifiable findings, apply rules consistently, protect legitimate investors and implement lasting reforms in beneficial-ownership disclosure, fund liquidity and market surveillance.
Investors should respond with calibrated diligence rather than either complacency or wholesale withdrawal. Before committing capital, they should map ownership and related-party relationships, test valuation assumptions against cash flow rather than quoted prices alone, review counterparties for exposure to affected funds, and build regulatory contingencies into transaction documents.
An FDI advisory firm such as fdiconsultancy.com can support that process through market-entry assessment, incorporation and corporate structuring, legal and tax compliance, investment-incentive analysis, and government relations with relevant authorities. Where an investment proceeds, on-the-ground project management can coordinate approvals, banking, governance and operational implementation, while import-export facilitation can protect the commercial timetable from financial-market disruptions.
The June 2027 MSCI review now provides a measurable external deadline. Türkiye’s opportunity is to show that enforcement reaches misconduct without destabilizing legitimate enterprise, and that reforms produce independently verifiable market data. For foreign investors, the central question is no longer whether the investigation will create headlines. It is whether institutional remediation will reduce the governance risk embedded in future Turkish investments.