Ergun's résumé reads like a textbook on Turkey's financial evolution. After completing both his undergraduate and graduate studies, he entered the capital-markets arena and amassed 24 years of experience across a range of institutions. On March 26, 2021, he was promoted to deputy general manager of Borsa İstanbul, a role that positioned him as the second-in-command of the nation's primary stock exchange. In the years that followed, he rose to the top job, becoming the general manager of Borsa İstanbul A.Ş.
Borsa İstanbul itself is more than a trading venue; it is the central hub where public companies list shares, where investors buy and sell equities, and where the pulse of the Turkish economy can be felt in real time. The exchange's leadership therefore carries a heavy responsibility: to ensure transparent, orderly markets and to safeguard investor confidence. Ergun's long tenure and academic credentials had, until now, made him a figure of stability in a sector often buffeted by political and economic turbulence.
The arrests on Oct. 31 did not happen in a vacuum. They were part of a larger criminal probe that prosecutors have described as a "fon soruşturması," or fund investigation. The scale of the operation—nearly a hundred detainees—indicates that authorities suspect a widespread pattern of wrongdoing within the investment-fund ecosystem.
Because they sit at the intersection of public capital and private management, they are subject to strict regulatory oversight.
In Turkey, investment funds are pooled vehicles that collect capital from individual and institutional investors to purchase a diversified portfolio of assets. Because they sit at the intersection of public capital and private management, they are subject to strict regulatory oversight. Allegations of misconduct—whether through illicit fund-raising, misallocation of assets, or collusion with market operators—can undermine the entire financial system's integrity.
The fact that the investigation has already led to 99 arrests underscores the seriousness with which Turkish prosecutors are treating the matter. It also suggests that the alleged misconduct may have involved a network of actors spanning fund managers, corporate executives, and possibly political intermediaries.
Ergun's detention was officially linked to two criminal statutes: "membership in an organization established for the purpose of committing crimes" and "bribery." Under Turkish law, membership in a criminal organization (often referred to as a "mağdur örgüt" in legal parlance) carries heavy penalties, reflecting the state's intent to dismantle coordinated illicit activity. Bribery, meanwhile, is a direct affront to the principle of fair market conduct; it implies that a public official or market participant accepted something of value in exchange for influencing a decision.
The pairing of these charges suggests prosecutors believe Ergun may have been part of a broader scheme that leveraged his position at the exchange to facilitate or conceal illicit transactions. In practice, such allegations could involve manipulating listing requirements, granting preferential treatment to certain funds, or turning a blind eye to irregularities in exchange operations.
Within the limited details released, two corporate names have surfaced: Pusula Finans Holding and Tera Yatırım. Both entities operate in Turkey's financial services sector, with Pusula Finans known for its portfolio of investment-fund products and Tera Yatırım recognized as a brokerage and asset-management firm. The investigation has focused on negotiations between the two and issues surrounding investment funds, suggesting their relationship may have been a focal point of the probe.
The inclusion of these firms does not necessarily imply guilt; rather, it signals that the probe is scrutinizing the interactions between fund managers, brokerage houses, and the exchange itself. In markets worldwide, the lines between legitimate business dealings and collusive behavior can blur, especially when large sums and regulatory discretion intersect.