U.S. stock indexes closed higher on Tuesday, helped by gains in Nvidia and other chipmakers, as investors awaited possible negotiations between the United States and its trading partners for more clarity on Washington's tariff plans.

Year to date, Nvidia ( NVDA 1.69%) stock has returned 2%, while Palantir Technologies ( PLTR 0.20%) stock has advanced 72%. But forecasts from Wall Street analysts suggest that investors should buy one and sell the other.

Nvidia’s market capitalization hit $3.36 trillion on Monday afternoon. That’s within 2% of overtaking Microsoft for the most-valuable slot. Microsoft still generates nearly twice Nvidia’s annual revenue,