The detention was ordered in connection with an ongoing investigation conducted by the Istanbul Chief Public Prosecutor’s Office, Anadolu Agency reports.
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Ergun is suspected of accepting bribes and belonging to an organization established for the purpose of committing crimes, according to the report.
The investigation focuses on transactions in Türkiye’s capital markets, including activities involving investment funds.
Anadolu Agency did not provide further details about the specific allegations against Ergun or identify its source for the information.
Representatives of Borsa Istanbul were not immediately available for comment following the detention, which was widely reported by Turkish media.
The development comes amid increased regulatory scrutiny of Türkiye’s investment fund industry.
In September, Turkish regulators ordered the liquidation of 131 investment funds managed by seven asset management companies after some reported difficulties meeting investor redemption requests.
The investigation into capital market transactions remains ongoing, and no judicial ruling on Ergun’s alleged involvement has been announced.
