Işıklar Enerji emerged as the top gainer on the stock exchange this week. The most significant drop was recorded in Tekfen shares. The BIST 100 index on the Istanbul Stock Exchange ended the week with a 2.90% loss, closing at 9,379.83 points. Throughout the week, the index fluctuated between its lowest point of 9,339.67 and its highest point of 9,643.17. During the same period, the Borsa Istanbul financial index decreased by 1.24%, closing at 11,010.44 points, the services index experienced a 2.59% decline to 9,349.66 points, the industrial index saw a 2.47% decrease to 12,451.71 points, and the technology index suffered a 1.15% loss, ending at 18,311.66 points. Among the stocks included in the BIST 100 index, Işıklar Enerji Yapı Holding saw the most significant rise 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. On the other hand, Tekfen Holding experienced the most significant loss among the listed stocks, with a 13.13% decrease, followed by Çimsa Çimento with an 11.22% decrease and Kardemir (D) with an 8.73% decrease. The most valuable companies with shares traded on the Istanbul Stock Exchange were ASELSAN with 535 billion 344 million Turkish Lira, Garanti BBVA with 465 billion 360 million Turkish Lira, and Turkish Airlines with 420 billion 555 million Turkish Lira.