Turkey's BIST 100 index dropped 5.54% on September 16, closing at 13,122.58, after retail investors pulled roughly $1 billion from local funds in a single day. Two asset managers defaulted on redemption requests as new regulatory limits on illiquid holdings triggered a liquidity crunch.
Turkey's stock market just posted one of its worst sessions in recent memory, and the trigger was neither geopolitics nor an interest-rate shock. It was a fund run.
The BIST 100 cratered 5.54% on September 16 to close at 13,122.58. At its worst point during the session, the index was down 7.7% intraday. Retail investors withdrew roughly $1 billion, approximately 550 billion Turkish lira, from local investment funds in a single day. Two prominent asset managers could not keep up with the flood of withdrawal requests, and panic did the rest.
A regulatory fix broke the market
Turkey's Capital Markets Board, known locally as the CMB or SPK, had recently tightened rules on fund managers, targeting the practice of loading funds with illiquid, low-free-float stocks often tied to affiliated parties. Global index providers, including MSCI, had flagged transparency concerns around these concentrated holdings. That pushed the CMB to lower ownership disclosure thresholds and cap single-stock exposure within funds.
The new restrictions forced fund managers to start unwinding positions in stocks with very few willing buyers. When holders of illiquid assets are all forced to sell at once, the result is a liquidity mismatch — and once retail investors notice the stress, a run follows.
Two firms default on redemptions
Pusula Portföy, which oversees roughly $13 billion in assets, was the first to default on redemption requests for certain funds on September 16. Tera Portföy followed shortly after, with defaults totaling 366 billion lira, approximately $7.5 billion.
Since late August 2026, Turkish funds have hemorrhaged approximately 128.7 billion lira, about $2.7 billion, as the regulatory changes reshaped the investment landscape. Therefore, the September 16 exodus was the crescendo of a trend that had been building for weeks.
What comes next
Turkey's Financial Stability Committee has scheduled an emergency meeting for September 17, the day after the crash. The structural problem is straightforward but hard to solve quickly: regulations now require fund managers to reduce positions in thinly traded stocks, but selling those stocks in size erodes fund values and triggers more redemptions, which forces more selling.
Temporary redemption gates, backstop liquidity facilities, or accelerated restructuring of troubled funds are among the tools available to the committee. The $2.7 billion in cumulative outflows since late August suggests investor patience was already thinning before the acute crisis hit.
Source: Crypto Briefing
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