Nebius (NBIS) stock popped on Thursday after the cloud computing specialist announced price hikes of around 20% effective Oct. 1. Shares in rival CoreWeave (CRWV) fell amid stock and debt sale plans. Nebius announced the price hikes before the market open. Further, Nebius rents out computer servers equipped with Nvidia (NVDA) artificial intelligence accelerators called GPUs. Nvidia in July disclosed…