U.S. stocks opened with the memory sector leading gains, as SK Hynix and SanDisk rose 4%.

October 21, according to BIT(bit.com) market data, US stocks opened with the Dow up 0.3%, the S&P 500 up 0.3%, and the Nasdaq up 0.7%. SK Hynix (SKHY.O) and SanDisk (SNDK.O) rose 4%, Micron Technology (MU.O) rose 3%, SpaceX (SPCX.O) rose 8%, and Nvidia (NVDA.O) rose 2%.