The Wall Street Journal is reporting that the biggest firms in Silicon Valley have invested $400 billion into artificial ...

Amazon carried the U.S. stock market to the finish of another winning week and month. The S&P 500 rose 0.3% and pulled closer to its all-time high set on Tuesday.

Making some investors nervous, the rally has lifted the S&P 500’s forward price-to-earnings multiple above 23, putting the market’s valuation around its highest since the dot-com bubble 25 years ago, ...

Amazon led the U.S. stock market on Friday to the finish of another winning week and month.The S&P 500 rose 0.