CNBC·2025-10-29 07:30Group 1 - Investors are increasingly interested in artificial intelligence, despite concerns over high valuations in the sector [1] - The S&P 500, Dow Jones Industrial Average, and Nasdaq Composite all reached new intraday highs, driven by gains in technology stocks like Nvidia and Microsoft [2] - Apple and Microsoft both achieved a market capitalization exceeding $4 trillion, marking a significant milestone for Apple [2] Group 2 - Nvidia announced a $1 trillion investment in Nokia to support the development of its AI initiatives [3] - Microsoft holds a 27% stake in OpenAI's for-profit business, positioning itself for potential significant returns if AI becomes a sustainable revenue-generating sector [4] - Investors in technology are optimistic about substantial gains, with predictions of a technology revolution driven by AI [5]