Woofun AI data shows that US stock storage sector equities experienced a broad pre-market surge on July 20. SK Hynix ADR (SKHY.O) led the gains with a 5.01% increase, while Micron Technology (MU) rose 3.47% and Seagate Technology (STX) climbed 3.41%. Western Digital (WDC) and SanDisk (SNDK) also posted gains of 2.89% and 2.96% respectively.