This AI stock is surging after an ex-OpenAI employee's fund disclosed a stake. Here's why

Nebius, a cloud provider that supplies GPUs (graphics processing units, the specialized chips used to train AI models), saw its stock rise after a hedge fund founded by a former OpenAI researcher disclosed a 5.6% ownership stake in the company. Nebius has become a major provider of AI computing infrastructure in Europe, recently securing major partnerships including a $27 billion deal with Meta and a $2 billion investment from Nvidia.