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Turkey’s BIST 100 index came under strong selling pressure on Monday, falling 3.14% to 12,494.81 by 2:10 p.m. local time. The index lost 404.54 points after opening at 12,689.87 and fell as low as 12,485.65 during the session. Concerns surrounding domestic fund developments, combined with heightened geopolitical risks and rising oil prices in global markets, contributed to the decline.
News : Gökhan Turhan

The BIST 100 index came under heavy selling pressure on Monday, September 28, 2026, falling sharply during the session. As of 2:10 p.m. local time, the benchmark index had lost 404.54 points, declining 3.14% to 12,494.81.
The index opened lower at 12,689.87, down 1.62% from its previous close of 12,899.35. Selling accelerated during the session, pushing the BIST 100 to an intraday low of 12,485.65.
Domestic market concerns surrounding ongoing fund investigations and developments involving funds subject to liquidation have weighed on investor sentiment. The latest decline follows significant losses recorded in the Turkish stock market last week, keeping investors focused on developments in the local fund market.
Global risk factors have also contributed to the pressure on Turkish equities. Renewed tensions between the United States and Iran, uncertainty surrounding the Strait of Hormuz and higher oil prices have increased concerns over global market risks. Asian markets also faced selling pressure, with South Korea’s KOSPI falling 2.70%.
Market participants are closely watching the 12,500 and 12,400 levels on the BIST 100 following Monday’s sharp decline, while the 12,800 and 12,900 levels remain important reference points on any potential recovery.