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Nebius Stock Jumps After Situational Awareness Discloses 5.6% Stake

The disclosure signals institutional confidence in Nebius’s plan to scale AI data centers and could help unlock financing for its multi‑gigawatt expansion.

Overview

  • The fund Situational Awareness, led by Leopold Aschenbrenner, filed that it owns 5.6% of Nebius—about 12.41 million Class A shares—which triggered an roughly 11–12% after‑hours rally on Wednesday.
  • Nebius reported strong first‑quarter results with $399 million in revenue, a 684% year‑over‑year increase, and $129.5 million in adjusted EBITDA that analysts say support the growth narrative.
  • The company is already investing heavily in infrastructure, recording $2.47 billion in property and equipment additions in Q1 and raising 2026 capex plans into the multi‑billion range to build out GPU‑dense data centers.
  • Strategic backing from partners is material to the plan, with a reported $2 billion NVIDIA investment and large purchase commitments from Meta and Microsoft that underpin customer demand.
  • Key risks remain significant and concrete: the stock trades at a high multiple (about 68x P/E), insiders sold roughly $123.8 million of shares recently, and Nebius faces GPU supply, power contracting, permitting, and buildout execution challenges that could slow expansion.