Nvidia, TSMC, ASML Among Tech Stocks Sinking on DeepSeek Threat

1. DeepSeek's new AI model runs on less-advanced chips, affecting NVIDIA and ASML shares. 2. U.S. tech stocks question valuation as deeper AI resources become more available. 3. NVIDIA and TSM fell over 11% premarket; ASML shares dropped about 7%. 4. Citi maintains a buy on NVIDIA despite DeepSeek's potential market disruption. 5. DeepSeek's achievements raise concerns over U.S. AI companies' future competitiveness.