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Nebius Group shares jumped 7% on July 21 after Nvidia formally disclosed a 9.3% ownership stake, reinforcing the strategic weight of a freshly signed $1 billion AI computing deal with Reflection AI.
- NBIS rose 7% in premarket trading July 21, touching $194.90, after Nvidia disclosed a 9.3% stake of ~22.26 million shares.
- Nebius inked a $1B AI computing infrastructure agreement with Reflection AI startup through 2029, including access to Nvidia GB300 chips.
- NBIS has gained roughly 250% over the past 12 months, lifting its market capitalization to approximately $46 billion.
Lead
Shares of Nebius Group (NASDAQ: NBIS) climbed as much as 7% in premarket trading on Tuesday, July 21, 2026, after Nvidia formally disclosed it holds a 9.3% stake — approximately 22.26 million shares — in the Amsterdam-headquartered AI cloud firm. The regulatory filing follows a $1 billion AI computing infrastructure agreement between Nebius and Reflection AI, an open-source AI startup co-founded by former Google DeepMind researchers, announced one week earlier. Together, the two disclosures cement Nebius's position at the center of a fast-consolidating AI infrastructure supply chain.
What Happened
Nvidia's 9.3% ownership position in Nebius comprises 1.19 million shares acquired as part of its $2 billion strategic investment announced in March 2026, plus 21.065 million shares tied to a warrant that Nvidia is contractually barred from exercising before September 11, 2026. The formal stake disclosure, filed Tuesday, crystallized the depth of the relationship and triggered a fresh wave of investor buying.
The $1 billion Reflection AI computing deal, announced July 14, runs through 2029 and grants Reflection priority access to Nvidia GB300 AI chips housed within Nebius's AI computing infrastructure. The agreement mirrors — on a smaller scale — a separate contract Reflection signed with SpaceX in June, under which it committed $150 million per month in GB300 capacity across the same three-year window, a total commitment valued at up to $6.3 billion.
Market Reaction
Nebius stock reached $194.90 in premarket trading Tuesday, extending one of the more dramatic equity runs in the AI infrastructure space. NBIS has added nearly 250% over the past 12 months and rose roughly 230% in the first half of 2026 alone, lifting the company's market capitalization to approximately $46 billion. Nvidia's stake disclosure functioned as a confidence signal reinforcing already-bullish sentiment building around the Reflection deal.Strategic Context
Nebius evolved from its origins as a spinout of the Russian technology conglomerate Yandex into a European-headquartered neocloud operator delivering AI compute at scale. Its positioning as a neutral, GPU-dense cloud provider — one with formal backing from the world's dominant chip designer — makes it an attractive counterparty for AI startups seeking alternatives to the hyperscaler duopoly of Amazon Web Services and Microsoft Azure.
The Nvidia AI deal framework underpinning Nebius is notable for its specificity: clients gain not just chip access but fleet health monitoring, early integration with next-generation Rubin-platform hardware, Vera CPUs, and BlueField storage infrastructure — a full-stack advantage that commodity cloud providers cannot readily replicate.
Reflection AI Startup: Rapid Ascent
Reflection AI was founded in 2024 by Misha Laskin, former reward-modeling lead on Google DeepMind's Gemini project, and Ioannis Antonoglou, a co-creator of AlphaGo, AlphaZero, and MuZero. The company has positioned itself as the primary American answer to China's DeepSeek, pursuing open-weight frontier models with a compute-intensive development strategy.Its valuation has expanded at a pace few startups match: from roughly $545 million in March 2025 to $8 billion in October 2025 following Nvidia's $2 billion Series B, to a $25 billion pre-money figure as of March 2026. The company has raised close to $2.6 billion in total from backers including Nvidia, Sequoia Capital, and Lightspeed Venture Partners.
AI Computing Infrastructure: A Tightening Supply Chain
The back-to-back computing contracts — SpaceX, then Nebius — reflect a deliberate multi-cloud strategy by Reflection, which requires massive GPU clusters to train and deploy competitive open-weight models. For Nebius, the sequencing validates its thesis that demand for non-hyperscaler AI computing infrastructure will sustain high-margin revenue growth well into the decade.
The pattern also illustrates how Nvidia functions as connective tissue across the entire ecosystem. As chip designer, early investor in Reflection AI, and now a declared 9.3% owner of Nebius, Nvidia occupies every node of the value chain simultaneously — from silicon supply through compute platform to the end AI developer.
