The Japanese yen (dollar/yen) traded Monday to 160.17, the first time above 160 since April 1990. The yen rallied to 154.54 after purported intervention. The Japanese currency had weakened back to 157.94 by Wednesday, before a second round of intervention pushed the dollar/yen down to 153. It was back above 156 on Thursday, before reversing lower to end the week at 153.05. From high to low, it was a range of 5%. The Nasdaq 100 (NDX) traded up to 17,800 in Monday trading - then dropped 2.9% to Wednesday morning lows.