Wall Street looked to keep momentum from a tech-fueled rally that saw Nvidia leap to become the world's first $4 trillion public company.

Stock futures are pointing to a slightly higher open on Wednesday after a sluggish start to the week amid uncertainty about U.S. trade policy.

What level of tariffs will the U.S. impose on imports and when? Stock futures were falling early Monday as markets were roiled by threats of new levies but also confusion over the deadline for the proposed duties.