The DAX 40 is experiencing its first weekly loss in three, having retreated from a record high of 19,683 to below the September peak of 19,492, indicating potential further downside. The Dow Jones is also on track for a negative week, with a significant drop from last week's record high, testing key support levels around 41,880 and 41,802. Meanwhile, the NASDAQ 100 faces its first weekly loss in over a month, with a sell-off from a three-month high of 20,499, bringing the early October low of 19,611 back into focus.