Palantir Technologies has named Nebius Group its preferred sovereign AI infrastructure partner, allowing eligible Palantir customers to deploy and fine-tune open models on Nebius hardware while retaining control of their data and models. Nebius' AI-native compute and inference infrastructure will operate inside Palantir's enterprise security perimeter, and the companies plan modular data-center deployments at sites with available power. Nebius rose 7.73% to close at $243.88 on Tuesday, while Palantir fell about 2.31% to $170.30, according to Benzinga Pro data. The partnership arrives as Michael Burry holds bearish positions in both companies, including out-of-the-money Palantir puts and a Nebius short disclosed in early August. Nebius previously reported 454% year-over-year revenue growth and a $3 billion annualized run rate, while Palantir rose more than 5% in August after its ninth consecutive EPS beat. The companies have not disclosed the partnership's contract value, duration or committed capacity.