The stock market is open for business between 9:30 a.m. and 4 p.m. Monday to Friday. Billions of shares are traded in the American markets, making them very liquid and efficient.

SpringWorks Therapeutics stock surged over Monday after a report from Reuters that German medical tech giant Merck KGaA could be close to acquiring the company.

U.S. Steel shares gained ground Monday after President Trump on Sunday flagged new 25% tariffs on all steel and aluminum ...

Amazon shares lost ground in extended trading on Thursday after the tech giant reported cloud computing revenue below expectations and issued a tepid current quarter outlook. Monitor these key ...

U.S. stock futures point lower as investors evaluate disappointing tech earnings, shares of Alphabet drop as the Google ...

Cloudflare shares traded sharply higher on Friday after its fourth-quarter earnings topped analyst expectations. Monitor ...

Arm Holdings reported fiscal third-quarter results that topped Wall Street estimates and raised the midpoint of its narrowed sales outlook. ...

Shares of Super Micro Computer surged for a second straight session after it said it would give a second-quarter business update next week.

The S&P 500 gained 0.4% on Wednesday, Feb. 5, recovering from morning losses as chip giant Nvidia and other AI names reinvigorated the tech sector.

The S&P 500 edged 0.4% higher on Thursday, Feb. 6, as investors responded to the latest earnings results and awaited Friday morning's employment data.

The S&P 500 slipped 1.0% on Friday, Feb. 7, as the latest labor market data revealed that the U.S. economy added fewer jobs than expected in January.