The U.S. stock market opened with the Dow Jones down 0.06%, the S&P 500 up 0.09%, and the Nasdaq up 0.32%. Warner Bros. Discovery (WBD.O) rose 5.6% as Paramount made a $30/share acquisition offer. Rivian (RIVN.O) fell 2.5%, Tesla (TSLA.O) dropped 1.7%, and Morgan Stanley downgraded the ratings of both companies.