The selling pressure in global markets was also felt in Borsa Istanbul. The BIST 100 index started the week with a 2.80% decline. The BIST 100 index in Borsa Istanbul started the week at 9,117.38 points, down by 2.80%. At the opening, the BIST 100 index fell to 9,117.38 points, a decrease of 262.45 points and 2.80% from the previous close. The banking index lost 3.61% while the holding index lost 2.80% in value. While all sector indices declined, banking suffered the biggest losses. In the domestic market, the BIST 100 index, which followed a selling trend yesterday, ended the day at 9,379.83 points, losing 1.10% in value. In global markets, the selling pressure that emerged after US President Donald Trump announced reciprocal tariffs gained strength, carrying over to the new week. Analysts mentioned that weekly money and banking statistics domestically, news flow related to US tariffs internationally, Sentix investor confidence index in the Eurozone, and retail sales would be monitored today. From a technical standpoint, support levels for the BIST 100 index are at 9,100 and 9,000, while resistance levels are at 9,200 and 9,300 points.