Investors focused on the Fed's decision to leave interest rates unchanged and Chair Jerome Powell's news conference on Wednesday. Earnings from Meta and Microsoft were due after the closing bell.

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.