Nebius Challenges CoreWeave After Landmark Microsoft AI Deal

Nebius, the Amsterdam-based company formed from the non-Russian remnants of Yandex N.V., has pushed into the AI cloud market with a multi-year infrastructure agreement with Microsoft that positions it as a direct challenger to GPU-focused neocloud providers such as CoreWeave.

The move follows Nebius’s strategic separation from its Russian operations in mid-2024, when Yandex’s Russia-based assets were sold and the remaining international businesses reorganized under the Nebius name. The rebrand and carve-out left Nebius focused on full-stack AI infrastructure, data labeling and managed services for model training and inference.

Markets reacted quickly: Nebius shares surged on Nasdaq after the Microsoft agreement became public, reflecting investor enthusiasm for long-term contracts that underpin capital-intensive expansion in GPU capacity. The price action underscores strong demand from hyperscalers for third-party GPU supply and the willingness of strategic customers to secure capacity beyond their own campuses.

In a broader context, the Nebius story illustrates how geopolitical pressures and sanctions prompted a corporate reshuffle that created a Western-focused AI infrastructure player. The sale of Yandex’s Russia operations and the subsequent repositioning allowed Nebius to pursue partnerships and capital-raising outside Russia, a dynamic that has reshaped its market opportunities and risk profile.

Analysts note that while Nebius gains credibility from marquee contracts, it faces near-term execution challenges: ramping data-center capacity, securing long-term power deals and managing chip supply. Reporting that Microsoft’s deals with neocloud providers also secure large allocations of Nvidia GPUs highlights how access to chips and vendor relationships will determine winners in the AI compute market. Investors will watch backlog, margin dynamics and contract delivery timelines closely.