US memory chip stocks gain in pre-market trading, Sandisk (SNDK.O) up 3.5%

According to data from msx.com, US memory chip stocks strengthened in pre-market trading, with Sandisk (SNDK.O) rising 3.5%, Micron Technology (MU.O) up 5.2%, Western Digital (WDC.O) gaining 3.5%, and Seagate Technology (STX.O) increasing 2.9%.