US Stock Futures Tumble As DeepSeek Buzz Jolts Big Tech: Expert Says The Chinese AI Model Is Yet To Prove Its Viability At Lower Cost In Long Term

1. U.S. stock futures fell sharply due to rising DeepSeek AI popularity. 2. Nasdaq 100 dropped over 4.3%, S&P 500 fell 2.43%. 3. Five 'Magnificent Seven' companies will report earnings this week. 4. Analysts warn of potential profit margin squeezes for big tech. 5. Economic indicators present mixed signals for market performance.