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The BIST All-100 Index (XTUMY) ended Friday, September 18, 2026, down 4.71% at 63,367.35 points. After closing at 66,502.43 points in the previous session, the index lost 3,135.08 points. XTUMY reached 64,202.42 points at its session high before falling to an intraday low of 62,840.86.
The BIST All-100 Index (XTUMY) came under heavy selling pressure on Friday, September 18, 2026. The index fell 4.71% during the session, closing at 63,367.35 points.
XTUMY opened the day at 64,202.42 points, which also marked its intraday high. The index then declined to an intraday low of 62,840.86 points. Compared with its previous close of 66,502.43, the index lost 3,135.08 points by the end of the session.
The BIST All-100 Index is one of the indicators used to track the performance of a broad group of equities listed on Borsa Istanbul. The sharp decline recorded on September 18 reflected significant selling pressure across the index during the trading day.
