Overview
- A sharp overnight sell-off in South Korea drove the drop with the KOSPI plunging about 11 percent on Tuesday and double-digit losses for Samsung and SK Hynix that spilled into U.S. premarket trading.
- The Philadelphia Semiconductor Index fell into bear-market territory as chip and memory names erased roughly $1 trillion of market value and several ETFs and individual leaders plunged more than 20 percent from June highs.
- Traders cited three overlapping catalysts for the rout: reports of Chinese production of DUV lithography tools, media stories about very large Nvidia–OpenAI financing arrangements, and a leveraged unwind in Korea, with the Chinese-equipment and Nvidia-financing claims described in coverage as unverified or developing.
- Companies pushed back on panic pricing: Micron reiterated about $50 billion in Q4 revenue guidance and analysts say structural AI demand and higher memory prices still support the bull case despite the rapid sell-off.
- Markets now face near-term tests that will shape the trade: the Fed’s policy decision and upcoming earnings from hyperscalers could validate or undercut AI capex assumptions and determine whether selling stays sector-specific or spreads more widely.