U.S. Stocks Sink Amid Fears Over DeepSeek and Chinese A.I. Advancements NYT Par : Jason Karaian and Joe Rennison 27 janvier 2025 à 21:18 Stiffer competition for the tech giants at the forefront of the artificial intelligence boom prompted investors to reassess the companies’ sky-high valuations. © Seth Wenig/Associated PressMonday’s moves cast a cloud over the markets as Meta, Microsoft and others prepare to present their latest quarterly earnings this week.