The BIST 100 index in Borsa Istanbul ended the week with an average loss of 0.74 percent. Margun Enerji shares performed the best last week, while CVK Maden was the biggest loser. The BIST 100 index in Borsa Istanbul closed the week with a 0.74 percent loss at 9,877.59 points. Throughout the week, the index ranged from a low of 9,756.73 to a high of 9,983.21 points. During the same period, the Borsa Istanbul financial index rose by 0.29 percent to 11,609.31 points, the service index saw a 0.28 percent loss at 10,024.99 points, the industrial index dropped by 1.51 percent to 12,507.54 points, and the technology index decreased by 5.27 percent to 14,103.72 points. Among the shares included in the BIST 100 index in Borsa Istanbul this week, Margun Enerji saw the highest increase by 9.96 percent. Margun Enerji was followed by Tekfen Holding with a 9.44 percent increase and Fenerbahçe Futbol AŞ with an 8.52 percent increase. The biggest losers among these shares were CVK Maden with an 11.25 percent decrease, Astor Enerji with a 10.68 percent decrease, and Kontrolmatik Teknoloji with a 9.17 percent decrease. The most valuable companies with shares traded on Borsa Istanbul were Garanti BBVA with 541.8 billion lira, Turkish Airlines with 437.115 billion lira, and Koç Holding with 405.236 billion lira.