The three major U.S. stock indexes opened higher, with the Dow Jones up 0.5%, the S&P 500 up 0.28%, and the Nasdaq up 0.27%. UnitedHealth (UNH.N) rose 9.4% as its first-quarter earnings report exceeded expectations. Amazon (AMZN.O) gained 2.1% after upgrading its partnership with Anthropic. Apple (AAPL.O) fell 0.3%, as Cook will step down as CEO, with Ternus taking over.