$1 Billion Withdrawal Triggers Sharp Sell-Off on Istanbul Stock Exchange

Turkish stocks suffered a sharp sell-off, sending the main Istanbul Stock Exchange index down more than 5%, after liquidity concerns in the mutual fund sector escalated into a broad wave of investor withdrawals — a development straining Turkey’s capital markets and testing the government-led economic stabilization program.

Withdrawals intensify market pressure

According to the Financial Times, individual investors pulled as much as $1 billion from Turkish mutual funds during Wednesday’s trading session, based on fund flow data from the platform Fintables. The outflow followed Bosola Portfolio’s announcement that certain of its funds were unable to fulfill redemption requests.

The BIST 100 index fell more than 5% on Wednesday, having already declined over 2% in the prior session. Concerns mounted that liquidity stress at a single asset management firm could spread across the broader fund industry.

Bosola Portfolio — which managed approximately $13 billion as of end-August — disclosed on Tuesday that some of its money market and investment funds could not satisfy redemption demands.

That announcement intensified pressure on asset managers to raise cash, prompting some funds to sell equities, further depressing prices and accelerating redemptions.

How a rally reversed into a rout

Analysts trace the origins of the disruption to strategies adopted by certain Turkish funds over the past two years: building large positions in shares of companies linked to or affiliated with the fund managers themselves — often firms with limited free-float equity available for trading.

This heavy concentration drove sharp price increases in those stocks, inflating the net asset values of the funds holding them.

As some funds posted exceptional returns, they attracted new investor capital — providing additional liquidity to buy the same or related stocks, reinforcing a cycle that pushed valuations higher.

But that mechanism began operating in reverse as redemption requests rose. Funds needed cash, forcing them to sell assets; falling stock prices eroded portfolio values, potentially spurring further withdrawals.

Exceptional returns under strain

Some Bosola-affiliated funds delivered massive gains in early 2026: one rose 164%, another 144%, over the first seven months of the year.

Terra Portfolio — part of Terra Group — also achieved elevated returns in certain funds, contributing to significant investor inflows.

Yet that extraordinary performance became a source of pressure once fund flows reversed direction. By end-August, Bosola held around 241,000 investment accounts, while Terra Group exceeded 500,000 accounts; together, the two firms managed roughly $27 billion.

Global warnings over market risks

International attention focused on risks tied to these practices in June, when MSCI warned of recurring instances suspected of involving coordinated trading related to fund holdings in smaller listed companies.

MSCI cautioned it may initiate consultations regarding Turkey’s inclusion in its market indices if tangible, credible progress addressing regulatory concerns is not evident ahead of its November review — a process that could ultimately result in downgrading Turkey’s market classification from “emerging” to “frontier.”

Tighter rules compound liquidity stress

Turkey’s Capital Markets Board introduced stricter regulations at the end of August, compelling funds to reduce concentrated positions in certain equities.

However, the rule implementation coincided with rising redemption requests, accelerating forced sales and compelling some funds to liquidate assets — converting previously unrealized losses into realized ones.

Turkish Treasury and Finance Minister Mehmet Şimşek stated that the non-bank financial sector requires enhanced regulation and oversight, as authorities seek to contain equity market turbulence without undermining investor confidence.