BIST 100 ends the week down 4.4% after MSCI decision

On 15 October MSCI froze some changes to its Turkey indexes until further notice, citing investor concerns about possible coordinated trading through funds linked to small listed companies. The BIST 100 fell 2.89% on 16 October to 11,721.72 and lost 4.44% over the week.

Friday turnover was 116.2 billion lira and every sector index fell: banks 1.87%, holdings 2.46%, leasing and factoring 5.72%. The weekly range was 11,653.38 to 12,291.17. The dollar traded around 49.46 lira.

Increases to foreign inclusion factors and share counts will not be applied, no new stocks will join the MSCI Turkey IMI, and migrations to larger size segments are halted. Without sufficient regulatory progress by June 2027, Turkey could be moved from Emerging to Frontier or Standalone status.

A downgrade would force emerging-market funds to sell Turkish stocks. The decision follows September's fund investigations. Finance Minister Mehmet Şimşek said legislation against capital market crimes should be completed by early 2027.

The decision traces back to September, when the Capital Markets Board and prosecutors began investigating claims that some investment funds artificially inflated the prices of small-cap stocks. Fund managers faced action and some funds entered liquidation. MSCI's concern is that without knowing how much of a company's stock truly trades freely, index weights cannot be calculated correctly.

MSCI sorts countries into developed, emerging and frontier groups based on economic size, market liquidity and how easily foreign investors can trade. Trillions of dollars in passive funds track these classifications automatically. Moving down a tier means emerging-market funds must sell, while frontier funds, which are far smaller, buy much less. That asymmetry is why a status warning moves prices well before any formal decision.

The central bank rate decision on 22 October is next. Analysts watch 11,600 as support and 11,800-11,900 as resistance.

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