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 on Borsa Istanbul ended the week with a 2.90% loss, closing at 9,379.83 points. Throughout the week, the index saw the lowest point at 9,339.67 and the highest at 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 experienced a 2.59% loss to 9,349.66 points, the industry index dropped by 2.47% to 12,451.71 points, and the technology index had a 1.15% decline to 18,311.66 points. Among the stocks included in the BIST 100 index, Işıklar Enerji Yapı Holding was the top performer this week with a 14.99% increase. Following Işıklar Enerji Yapı Holding were Graintürk Holding with an 11.58% increase and Katılımevim Tasarruf Finansman with an 11.21% increase. The biggest losers among these stocks were Tekfen Holding with a 13.13% decrease, Çimsa Çimento with an 11.22% decrease, and Kardemir (D) with an 8.73% decrease. The most valuable companies with shares traded on Borsa Istanbul were ASELSAN with 535 billion 344 million TL, Garanti BBVA with 465 billion 360 million TL, and Turkish Airlines with 420 billion 555 million TL.