CNBC Daily Open: U.S. stocks' gains in October owe much to AI
1. S&P 500 rose 2.3% in October, defying market fears. 2. Tech sector’s growth is driving overall market performance. 3. Amazon reports strong demand, boosting its shares and AI-related stocks. 4. Nvidia's $5 trillion valuation highlights AI's increasing importance. 5. S&P 500 is up over 16% year-to-date, indicating resilience.