Investment bank UBS estimates that $820 billion in artificial intelligence investments will expand the market rally and push the S&P 500 index to a new record.

Investment bank UBS estimates that $820 billion in artificial intelligence investments will expand the market rally and push the S&P 500 index to a new record.

Major financial firms Barclays and Stifel have boosted their S&P 500 year-end targets to 7,800, signaling strong confidence in corporate profits and the U.S. stock market's…