Borsa Istanbul Chief Executive Korkmaz Enes Ergun has been detained in a widening investigation into alleged bribery, market manipulation and misconduct involving investment funds, taking Turkey’s most serious recent capital-markets crisis into the leadership of the exchange itself. The detention does not establish guilt, but it raises the stakes for international investors because the credibility of Borsa Istanbul affects more than portfolio flows. It also influences acquisition valuations, local financing, initial public offerings and the eventual exit options available to foreign companies making direct investments in Turkey.
Investigation Reaches the Exchange’s Leadership
The Istanbul Chief Public Prosecutor’s Office said Ergun was detained on October 31 on suspicion of membership in an organization established to commit crimes and bribery. Anadolu Agency reported that the investigation remained in progress. Authorities had not, as of November 1, publicly released a detailed indictment explaining the specific transactions or decisions attributed to him.
That distinction matters. Detention is an investigative measure, not a conviction, and the allegations remain unproven unless established through judicial proceedings. It is also important to describe Ergun’s position accurately. He is Borsa Istanbul’s chief executive, or general manager, rather than simply its chairman.
Ergun is closely identified with the exchange’s institutional operations. According to Borsa Istanbul’s corporate biography, he began working at the exchange after graduating from Ankara University and accumulated 28 years of capital-markets experience. His responsibilities have included reviewing public offerings, examining listed companies and overseeing market activities. He has also served as deputy chairman of Takasbank and as a board member of the World Federation of Exchanges.
The detention is therefore more consequential than an enforcement action against an individual fund manager. It potentially brings questions about market surveillance, issuer oversight and the transmission of suspicious-transaction information into the governance structure of the exchange.
Ergun told a Turkish parliamentary committee on October 15 that Borsa Istanbul had made the necessary notifications to the Capital Markets Board, or SPK, according to Turkish media reports. The investigation must now establish whether the exchange’s monitoring systems functioned as intended, whether warnings were acted upon promptly and whether any officials improperly facilitated or ignored transactions. No conclusion on those questions can be drawn from the detention alone.
From Redemption Failures to a System-Wide Inquiry
The crisis emerged publicly in mid-September, when funds managed by Pusula Portföy reported difficulties meeting redemption requests. Concerns then spread to products managed by Tera Portföy and other firms. Funds with large positions in relatively illiquid shares could not easily sell those assets without driving prices sharply lower, while investors were simultaneously demanding cash.
On September 17, the SPK suspended transactions through TEFAS, Turkey’s electronic fund-trading platform, for funds founded by seven portfolio-management companies. It also placed 131 funds into liquidation. The affected managers included Tera, Pusula, Hedef, Atlas, A1, Bulls and Pardus.
The regulator subsequently extended part of the liquidation timetable from three months to six months. Its published procedures provide for portfolio assets to be converted into cash with regard to market depth and investor interests. In October, the SPK announced an interim-payment framework for certain Tera, Pusula and Atlas funds, including a ceiling of 1 million Turkish lira per investor, subject to the investor’s net investment and proportional entitlement. The SPK said investors whose September 17 orders were cancelled would receive distributions from liquidation balances according to their ownership share.
Reuters reported that Turkey’s portfolio-management industry had expanded to approximately $329 billion in assets by August 2026, from $246 billion a year earlier. That growth was accompanied by increasingly concentrated strategies in recently listed and thinly traded companies. Rising share prices improved the reported performance of funds holding those shares, attracting additional inflows and reinforcing the price increase.
The cycle became destabilizing when redemption demands forced managers to seek cash. Selling the most liquid securities first transmitted pressure from a limited group of funds into the broader market, while disposing of the concentrated small-cap positions threatened even larger valuation losses.
According to Reuters’ October analysis, the crisis pushed Turkish equities into a bear market and produced the BIST 100’s worst month since 2008. During the initial sell-off, Turkey’s authorities introduced liquidity measures and temporary flexibility for bank share-repurchase programs. The Finance Ministry argued that the problems were concentrated in a limited segment and did not represent a structural threat to the capital markets.
Enforcement Has Expanded Beyond Fund Managers
What began as a liquidity event has evolved into a broad criminal and regulatory investigation. Executives connected to portfolio managers, investment firms and listed businesses have been detained or arrested pending trial. In late September, authorities announced warrants for dozens of suspects, while subsequent operations reached executives associated with Tera and Ral Yatırım Holding.
The inquiry also moved toward the former leadership of the SPK. In October, Finance Minister Mehmet Şimşek authorized the ministry’s inspection board to examine former SPK chairman İbrahim Ömer Gönül after prosecutors sought permission to investigate alleged abuse of office. Turkish state broadcaster TRT reported that the underlying regulatory reports concerned suspected manipulative transactions in certain Borsa Istanbul shares through investment funds between 2024 and September 2026.
The Justice Ministry has defended the chronology of the response. In an October 8 statement, it said prosecutors requested information from the SPK on August 19 and that fund-liquidation decisions followed on September 17. The ministry maintained that the inquiry was based on financial evidence and specific suspicions, while emphasizing the protection of good-faith investors.
Those statements address one of the central issues for foreign institutions: whether enforcement is retrospective and improvised, or the product of a predictable surveillance process. Effective prosecution of bribery and manipulation can strengthen a market. Confidence may nevertheless suffer if investors cannot determine which rules were breached, when regulators became aware of the conduct and why intervention occurred only after redemption failures had begun.
Transparency will consequently be as important as the number of detentions. International investors will look for a documented account of the roles played by the SPK, Borsa Istanbul, Takasbank, the Central Securities Depository and external custodians. They will also watch whether investors are treated consistently during liquidation and whether court proceedings clarify the evidence behind the allegations.
Why a Portfolio-Market Scandal Matters to FDI
Foreign direct investment and portfolio investment are different categories of capital. An investor building a factory, acquiring a logistics operator or establishing a Turkish subsidiary is not directly exposed to a local mutual fund’s redemption terms. Yet the two channels are linked through the cost and availability of capital.
A functioning equity market provides acquisition benchmarks, funding for local partners and a possible exit route through an IPO or secondary sale. Distorted small-cap valuations can make acquisition targets appear more expensive than their cash flows justify. Conversely, forced liquidations can depress otherwise sound companies and create apparent bargains carrying undisclosed governance, pledge or related-party risks.
Turkey continues to attract substantial direct investment despite these concerns. The Presidency’s Investment and Finance Office, citing central-bank balance-of-payments data, said FDI inflows reached $13.1 billion in 2025, an increase of 12.2 percent from 2024. UN Trade and Development, which uses a different methodology, estimated 2025 inflows at $12.5 billion. The discrepancy illustrates the importance of checking definitions, particularly the treatment of real-estate purchases and intercompany debt.
The fund investigation does not erase Turkey’s underlying investment case, which includes a large domestic market, an established manufacturing base and access to European, Middle Eastern and Central Asian supply chains. It does add a governance premium. Investors must assess not only a target company’s operations but also its shareholders, financing relationships, brokerage links and exposure to funds or securities caught in enforcement action.
The episode follows an earlier confidence shock in March 2025. In its 2026 Article IV report, the International Monetary Fund estimated that foreign investors liquidated roughly $18 billion in lira assets over two weeks during that period, including about 70 percent of their carry-trade positions. That experience demonstrated how quickly institutional confidence can affect reserves, exchange rates and domestic financing conditions.
The Regulatory Test Is Now Institutional
Turkey’s immediate challenge is to separate the alleged misconduct from the wider market and demonstrate operational continuity at Borsa Istanbul. Investors will require clarity on Ergun’s duties during the investigation, interim executive authority and the independence of internal surveillance and audit functions.
The liquidation process is another test. Assets must be sold without unnecessary destruction of value, but prolonged restrictions also trap investors and obscure price discovery. Coordination among the SPK, Borsa Istanbul, Takasbank, the Central Securities Depository, the banking regulator, state institutions and appointed banks must therefore be accompanied by regular disclosures on asset realization and payments.
Longer term, regulators may need to strengthen limits on related-party exposure, leverage and concentration in illiquid securities. They may also need more frequent reporting of fund liquidity mismatches and stress tests based on realistic redemption scenarios. Exceptional returns generated by repeated purchases of thinly traded affiliated shares should trigger enhanced scrutiny before they become systemically relevant.
For international investors, the credibility of those reforms will depend on consistent implementation. Rules introduced after a crisis are less valuable if market participants expect exemptions, informal intervention or uneven enforcement. Equally, a forceful investigation can become confidence-enhancing if the evidence is disclosed through due process and institutional weaknesses are corrected.
What This Means for Foreign Investors
Foreign companies considering Turkey should not treat the investigation as a reason for automatic withdrawal, but it should change the depth and sequencing of due diligence.
Market-entry analysis should now include the ownership and trading history of potential partners, not merely their market share and operating performance. Acquisition models should distinguish sustainable earnings from gains linked to securities revaluation, related-party financing or unusually supportive fund ownership.
Company incorporation and corporate structuring require clear separation between the foreign investor, local operating entities and higher-risk financial counterparties. Shareholder agreements should address regulatory investigations, asset freezes, changes of control and the loss of key licenses.
Legal and tax compliance reviews should extend to beneficial ownership, source of funds, related-party transactions, anti-bribery controls and the accuracy of disclosures made to the SPK and the Public Disclosure Platform. Government-relations and regulatory-liaison work should establish which approvals, notifications and consultations are required without relying on informal assurances.
Investors pursuing incentives must also verify that financing assumptions remain workable if local capital-market conditions change. Project management should incorporate alternative lenders, conservative liquidity buffers and contingency plans for delayed permits, counterparties or funding.
The central lesson is that Turkey’s operating opportunity and its institutional risks must be evaluated together. An FDI advisory firm such as fdiconsultancy.com can support that process through market entry, incorporation, incentives analysis, compliance, government relations and on-the-ground project management. In the aftermath of the fund crisis, the decisive advantage will come from verifiable counterparties, defensible structures and execution plans that remain viable even when market confidence weakens.