Shares of Nebius Group climbed 2.89% Friday morning, adding $5.45 to reach $193.88, extending a remarkable two-day rally that has seen the artificial intelligence infrastructure company's stock swing dramatically as investors reassess both company-specific catalysts and broader sentiment toward the so-called neocloud sector.

Friday's gains built on a new multiyear computing power agreement with Reflection AI, worth more than $1 billion through 2029, which had already lifted shares more than 4% in premarket trading, according to StocksToTrade. The Netherlands-based Nebius, a "neocloud" provider that sells access to graphics processing unit-based AI computing capacity, has increasingly positioned itself as a key infrastructure supplier to AI-native companies seeking computing power without building out their own data centers.

Thursday's trading session, however, delivered by far the more dramatic move. Nebius shares surged as much as 31.64% at one point Thursday afternoon, according to TimothySykes.com, before settling with a gain that TipRanks separately clocked at 28.4%. The rally traced back to reporting from The Wall Street Journal that investment firm Citadel had acquired the bulk of hedge fund Situational Awareness's public equity portfolio, according to TipRanks. That transaction eased fears of a disorderly liquidation of the fund's heavily AI-weighted holdings, since Situational Awareness, founded by former OpenAI researcher Leopold Aschenbrenner, had disclosed a $2.6........

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