Excitement about the artificial-intelligence boom helped lift Wall Street following a strong profit report from Palantir Technologies. So did a report showing growth accelerated last month for U.S.

U.S. stocks are rallying Tuesday as voters head to the polls on the last day of the presidential election and as more data piles up showing the economy remains solid.

After a jump of that magnitude, some investors may wonder if it's simply too late to buy the stock.

Palantir stock jumped on Q3 revenue that handily beat estimates while December quarter revenue guidance came in well above expectations.