Meta Platforms and most other U.S. stocks are rising Thursday following a rush of profit reports from some of the country’s most influential companies, but drops for Nvidia and Microsoft are keeping the market in check.

Microsoft is a key backer of OpenAI and it has committed to spending $80 billion on AI infrastructure this year in order to expand its global network of high-powered data centers to meet demand for the specialized chips required to train and run AI models.

Microsoft on Wednesday forecast disappointing growth in its Azure cloud computing business, sending its shares down more than 5% as investors worry about big spending, elusive artificial intelligence revenue and growing competition from cheaper AI models from China.