[Mixed Performance for Major U.S. Stock Indices at Market Open, Micron Technology Up 5.28%] BlockBeats News, June 22, U.S. stock market opened with the Dow Jones up 0.27%, the S&P 500 up 0.12%, and the Nasdaq down 0.08%. Micron Technology (MU.O) opened up 5.28% after the company announced a strategic agreement with Anthropic to expand next-generation artificial intelligence infrastructure.