Nebius

Nebius provides cloud infrastructure for building and running AI systems. Its AI cloud platform spans data preparation, model training and tuning, and production deployment, serving individual developers, research organizations, software vendors and enterprises. Customers use its infrastructure across fields including healthcare, robotics and financial services. Nebius is headquartered in Amsterdam and listed on Nasdaq as NBIS.

Founder and CEO Arkady Volozh leads the company. Its corporate separation followed Yandex N.V.’s completed Russian-business divestment in 2024, which left it with no interest in those businesses; the transaction’s announced valuation was approximately $5.4 billion, subject to adjustments. Nebius also publishes research tools: Kvax implements attention operations for JAX using FlashAttention-2 algorithms in Triton, with document masking and context parallelism. SWE-rebench evaluates coding agents on continuously updated, decontaminated software engineering tasks drawn from real GitHub repositories.

Nebius’s data center footprint spans Europe, the United States and the Middle East, combining an owned Finnish facility with leased and co-located sites and new facilities under development. Alongside serving developers and enterprises, it has long-term committed capacity contracts with large technology companies.