Markets are poised to open with gains Tuesday, the first day of trading under the second administration of U.S. President Donald Trump. Futures for the S&P 500 and Dow Jones Industrial Average rose about 0.

U.S. stocks rose as Trump's second term begins, with the S&P 500 up 0.9% and Dow gaining 538 points. Positive earnings reports and eased Treasury yields boosted investor confidence.

Putting valuations on publicly traded companies is tricky because so much is tied to stock prices -- and stock prices are influenced by many things a company can't control, such as the economy,

Nvidia (NVDA) reclaimed its title as the world’s most valuable public company on Tuesday as Apple’s (AAPL) shares slid.