Broadcom stock rallied 2% to hit a new high, while Palantir gained 0.4%, bouncing back from Monday's losses. Tesla skidded more than 1%, as it still tries to regain its 50-day moving average. And Uber stock steered 2.5% lower, threatening to breach its own 50-day line for the first time since late April.

The S&P 500 and Nasdaq opened at fresh record highs on Tuesday, as investors assessed a slew of earnings reports from major U.S. companies and looked ahead to the Federal Reserve's upcoming two-day policy meeting.

Major stock indexes edged higher Monday to kick off what will be an extraordinarily busy week of news for financial markets.