The detention of Borsa İstanbul chief executive Korkmaz Enes Ergün has pushed Turkey’s investment-fund investigation into the leadership of the institution responsible for operating the country’s securities markets. For international investors, the significance extends beyond the allegations against one executive. The case is becoming a test of whether Turkey can address weaknesses in market surveillance, fund liquidity and beneficial-ownership disclosure without undermining confidence in its regulatory institutions or restricting access to capital.
Investigation Reaches the Exchange
Ergün was detained on October 31 on suspicion of bribery and membership in a criminal organization, according to the İstanbul Chief Public Prosecutor’s Office, as reported by state-run Anadolu Agency and Turkish Minute. Detention is an investigative measure and does not establish guilt. As of November 2, prosecutors had not publicly detailed the transactions allegedly involving Ergün or announced a final indictment.
Borsa İstanbul’s board moved quickly to preserve operational continuity. It appointed deputy chief executive Atila Türeli as acting chief executive on November 1, one day after Ergün’s detention. Ergün had led the exchange since 2021. According to Borsa İstanbul’s official profile, Türeli is a lawyer who previously served as the exchange’s chief legal counsel and compliance director, giving the interim appointment a clear legal and institutional-governance dimension.
The leadership change comes alongside a reshuffle at the Capital Markets Board, known by its Turkish initials SPK. Hürriyet Daily News reported that former SPK chairman Mahmut Sütcü resigned on health grounds and was replaced by Muhsin Atcı, previously head of Turkey’s Tax Inspection Board. Ersin Başar Ekmekci was appointed deputy chairman, while Yasemin Girici joined the regulator as a board member.
The sequence matters for institutional investors. The exchange operates the trading venue and market infrastructure, while the SPK regulates issuers, funds and intermediaries. Simultaneous changes at both institutions may strengthen enforcement coordination, but they also raise questions about continuity, independence and the division of responsibility for earlier supervisory failures.
Borsa İstanbul itself is a strategically important state-linked asset. Its corporate disclosures show that the Turkey Wealth Fund owns 80.6 percent, while Qatar Investment Authority owns 10 percent through QH Oil Investments. This means the investigation concerns an institution with both sovereign ownership and a significant foreign state investor.
How the Fund Crisis Developed
The investigation grew out of a liquidity crisis that became public in September, when funds managed by Tera Portföy and Pusula Portföy reported difficulty meeting redemption requests. The affected portfolios reportedly held concentrated positions in shares with limited free float and low trading liquidity.
Such a structure can produce unusually strong reported returns while subscriptions are rising. Purchases by funds push up the prices of thinly traded shares, increasing the calculated value of portfolios that already hold those securities. Problems emerge when investors request their money back. The funds must sell assets to generate cash, but large sales in illiquid shares can sharply reduce the same prices used to calculate portfolio value.
Euronews reported that some managers also borrowed against their equity holdings, potentially magnifying both the advance and the subsequent decline. The publication said shares in Tera Yatırım had risen by more than 50,000 percent between listing and their peak before regulatory changes and redemption pressure accelerated the reversal.
On September 17, the SPK ordered the liquidation of 131 funds established by seven portfolio-management companies. The regulator subsequently said Central Securities Depository records showed that the funds had 455,758 unique investors. Finance Minister Mehmet Şimşek put their value at approximately $18.3 billion and said they represented about 10 percent of Turkey’s fund industry. He described the authorities’ response as placing the problem area under “quarantine.”
The broader market nevertheless experienced substantial spillovers. Euronews reported that the Borsa İstanbul All Shares Index fell 12 percent during the initial week of turmoil, with about 50 companies losing at least 40 percent of their value.
The Ministry of Justice says the chronology predates the public crisis. In an October 8 statement, it said İstanbul prosecutors identified unusual movements in certain funds and shares and requested information from the SPK on August 19. Liquidation decisions followed on September 17. That chronology appears intended to counter claims that regulators acted only after redemption failures became visible.
The investigation has since widened across asset managers, brokerages and holding companies. Hürriyet reported that more than 110 people had been arrested by the time of Ergün’s detention. The authorities are examining suspected market manipulation, illicit profits, overseas transfers and possible links among fund managers, company executives and investors. Each allegation will still require individual proof in court.
Liquidation and the Question of Investor Recovery
Turkey has adopted extraordinary procedures to return available money while the funds’ less-liquid assets are sold. İşbank and state-owned Ziraat Bank were assigned to oversee liquidations, while the normal disposal period was extended from three months to six months to reduce the risk of forced selling.
Under an additional SPK procedure, eligible investors can receive interim payments of up to 1 million lira per fund. These are advances against eventual liquidation proceeds, not a state guarantee of full principal or expected returns. Final recovery will depend on the realizable value of fund assets and any proceeds recovered through legal action.
Hürriyet reported that 29.3 billion lira was distributed to 235,705 investors in the first extraordinary interim payment on October 30. Including 68 billion lira previously paid to 63,759 investors through ordinary liquidation, total payments had reached 97.3 billion lira for 299,464 investors across 100 funds.
Vice President Cevdet Yılmaz has said Treasury resources will not be used to absorb private investment losses. That distinction is fiscally important, but it leaves investors exposed to the gap between published portfolio values and prices obtainable in actual sales.
For international institutions, the episode illustrates why headline net asset values are insufficient when evaluating locally domiciled funds. Due diligence must extend to the liquidity of underlying securities, fund concentration, related-party exposure, leverage, redemption terms, valuation methodology and the practical independence of custodians and portfolio managers.
MSCI Action Raises the International Stakes
Concerns about the market’s structure were already visible before the September crisis. In its June 2026 market-classification review, MSCI said international institutions had identified possible coordinated trading involving fund holdings affiliated with smaller listed companies. MSCI warned that such structures could artificially inflate estimates of free float, a key factor in deciding whether shares can be included in investable indexes.
The index provider called for more detailed and timely beneficial-ownership disclosure, effective enforcement against coordinated trading, and transparent rules for securities with structurally distorted free float.
In October, MSCI imposed an interim freeze on selected changes to its Turkey indexes. The provider said it would not implement increases in foreign inclusion factors or numbers of shares, add securities to the MSCI Turkey Investable Market Index, or permit upward migrations between size categories while it assesses the authorities’ response.
MSCI said credible progress must be evident by June 2027 or it could consult investors on moving Turkey from emerging-market status to frontier or standalone classification. A downgrade is not predetermined, but even the possibility matters. Benchmark classification influences passive allocations, portfolio mandates, trading liquidity and the cost of equity capital.
The detention of the exchange chief can therefore be interpreted in two ways. It may demonstrate that prosecutors are willing to investigate senior figures, supporting the case that enforcement is becoming more serious. Conversely, if the process lacks transparent findings, procedural safeguards or a clear explanation of earlier oversight failures, it could deepen questions about institutional predictability.
The decisive factor will be whether enforcement is followed by lasting structural reform. Arrests alone do not provide global investors with verifiable free-float data, consistent valuation standards or stronger controls on conflicts of interest.
Portfolio Turmoil Versus Turkey’s FDI Proposition
Foreign direct investment is distinct from portfolio investment, but the two channels interact. A manufacturer building a Turkish factory does not face the redemption risk of a local securities fund. It may nevertheless rely on Borsa İstanbul for an eventual initial public offering, use listed shares to finance an acquisition, enter a joint venture with a public company, or measure its Turkish subsidiary against local market valuations.
Turkey entered the crisis with improving direct-investment figures. The Presidency’s Investment and Finance Office, citing central-bank balance-of-payments data, said the country attracted $13.1 billion in FDI during 2025, 12.2 percent more than in 2024. Minister Şimşek said inflows excluding real estate reached $10.7 billion, the highest level in a decade. Manufacturing accounted for 31 percent of the reported total, while wholesale and retail trade accounted for 32 percent.
Those figures reflect enduring advantages, including Turkey’s industrial base, customs-union relationship with the European Union, large domestic market and position between Europe, Asia and the Middle East. Yet foreign investors also price governance, legal remedies, disclosure quality and regulatory consistency. Weakness in capital markets can raise acquisition discount rates, complicate exits and reduce confidence in minority-shareholder protections.
The practical implication is not that productive investment in Turkey should be assessed as equivalent to a speculative fund position. It is that capital-market governance must become part of wider country and counterparty due diligence.
What This Means for Foreign Investors
Investors considering Turkey should separate operational opportunity from financial-market exposure and test both independently. Market-entry analysis should include regulatory-enforcement risk, prospective financing channels and realistic exit scenarios, rather than relying only on sector growth and domestic demand.
Acquisitions and joint ventures require beneficial-ownership checks, related-party mapping, review of pledged shares and verification that reported free float and trading liquidity reflect economic reality. Company incorporation and corporate structuring should establish clear board controls, reserved matters, audit rights and protections for foreign minority shareholders.
Legal and tax compliance work should cover SPK rules where securities, funds or listed counterparties are involved, as well as anti-bribery, anti-money-laundering and cross-border payment obligations. Government-relations and regulatory-liaison support can help investors obtain authoritative guidance during a period of changing personnel and rules, but such engagement must be documented and compliance-led.
Companies seeking investment incentives should also verify that project economics do not depend on uncertain capital-market refinancing. On-the-ground project management can connect approvals, banking arrangements, supplier due diligence and milestone controls, reducing the risk that a sound industrial project becomes exposed to weaknesses elsewhere in the financial system.
For an FDI advisory firm such as fdiconsultancy.com, the relevant task is therefore not to predict the outcome of the criminal investigation. It is to translate the episode into stronger market-entry screening, incorporation safeguards, compliance systems, regulatory engagement and execution controls. Turkey’s response will ultimately be judged not by the number of detentions, but by whether foreign investors can independently verify ownership, valuations, liquidity and enforcement standards before committing capital.