Tech stocks just had one of their worst weeks in a year. Here’s how AI momentum went off the rails.

Tech stocks just had one of their worst weeks in a year. Here’s how AI momentum went off the rails. MarketWatch AI stocks melt down again. What’s going on? CNN Stock market today: Dow, S&P 500, Nasdaq slide as report of OpenAI IPO delay rattles techs Yahoo Finance Big Tech is spending trillions on AI. Investors now want proof it will pay off. CBS News S&P 500 ends lower; chips tumble and Moderna rallies Reuters