Nvidia futures were trading about 5.4 percent lower at $176.65 in early hours, against a previous close of $186.64. The stock has fallen 18.6 percent over the past month, 16.7 percent over three months and 13.3 percent over six months, amid worries about how Big Tech will finance AI spending and the impact of US midterm results. Over five years it has still gained 509 percent.