US stock futures edged lower on Wednesday as investors cautiously counted down to Nvidia's (NVDA) earnings report, seen as a crucial test of hopes for Big Tech amid tariff uncertainty. Nvidia's results are looming large as Wall Street looks to the AI chipmaker to confirm that megacap techs can still drive gains even as trade-war fears prey on markets.

Futures on Wall Street are trading with caution on Wednesday ahead of two important triggers that the street has to face later in the day, one being the minutes of the earlier FOMC meeting on May 6-7,

Nvidia stock was gaining on Tuesday, the day before the chip maker posts it first-quarter financial results. In midmorning trading, shares were up 3.2% at $135.50. The stock closed down 1.2% on Friday.