Woofun AI data shows that US semiconductor stocks declined in pre-market trading, with SK Hynix ADR falling approximately 5%. The downturn follows South Korea's announcement to increase minimum margin requirements for chip leveraged ETFs and ban new single-stock leveraged products. TSMC dropped about 2% after releasing its second-quarter financial report, which highlighted strong performance alongside a raised three-year capital expenditure outlook. Other storage sector stocks also retreated, with SanDisk and Western Digital down roughly 4%, and Seagate Technology falling 3%.