[U.S. Stock Market's Three Major Indexes Turn Negative] Odaily Planet Daily News: According to msx data, the three major U.S. stock market indexes have all turned negative. Micron Technology (MU.O) fell nearly 3% after previously rising over 4%, SanDisk (SNDK.O) dropped nearly 6%, and NVIDIA (NVDA.O) declined over 1% after previously gaining more than 2%.