The stock with the highest increase in the stock market this week was Işıklar Enerji. The most significant drop was recorded in Tekfen shares. The BIST 100 index in Borsa Istanbul closed the week at 9,379.83 points, losing 2.90%. Throughout the week, the index hit a low of 9,339.67 and a high of 9,643.17 points. During the same period, the Borsa Istanbul financial index decreased by 1.24% to 11,010.44 points, the services index lost 2.59% to 9,349.66 points, the industrial index dropped 2.47% to 12,451.71 points, and the technology index had a decrease of 1.15% to 18,311.66 points. Among the stocks included in the BIST 100 index, Işıklar Enerji Yapı Holding had the highest increase this week at 14.99%. Following Işıklar Enerji Yapı Holding were Graintürk Holding with 11.58% and Katılımevim Tasarruf Finansman with 11.21% increase. The stocks that experienced the most significant decreases were Tekfen Holding at 13.13%, Çimsa Çimento at 11.22%, and Kardemir (D) at 8.73%. The most valuable companies with shares traded on the Borsa Istanbul were ASELSAN with 535.34 billion liras, Garanti BBVA with 465.36 billion liras, and Turkish Airlines with 420.55 billion liras.