Qilai Shen / Bloomberg / Getty Images Nvidia shares climbed after the chipmaker announced a $100 billion investment in ChatGPT maker OpenAI. Key Takeaways Major U.S. equities indexes climbed Monday afternoon, boosted by gains in the tech sector as Nvidia announced a big investment in ChatGPT maker OpenAI. Apple shares rose after Wedbush raised its price target for the stock, pointing to better-than-expected demand for the iPhone 17. Kenvue shares slumped following reports the Trump administration wil ...