Elon Musk's AI company developing the Grok platform and large-scale data-centre infrastructure.
Around 4,781 people on the team.
xAI sits squarely in the a16z/Sequoia AI infrastructure cluster, backed by Andreessen Horowitz, Sequoia Capital, NVIDIA, Fidelity, BlackRock, and SpaceX across $39,135M raised over 6 rounds. Through shared capital it overlaps most heavily with the frontier-model labs OpenAI (4 shared investors) and Anthropic (4), and connects to the data and developer-tooling tier via Databricks (3), ElevenLabs (3), Crusoe (3), and Stripe (3), with a lighter tie to Kalshi (2). That overlap, plus a connection score of 70, places it at the center of a tightly cross-funded cluster of US AI and data-centre companies. The 4,781-person team is concentrated in the San Francisco Bay Area (25%) and New York (20%).
| Date | Round | Amount |
|---|---|---|
| Feb 2026 | Series D Plus Saudi Arabia's HUMAIN (PIF group) invested $3 billion in xAI's Series E shortly before the merger with SpaceX, later converting the stake into SpaceX shares. | $3B |
| Feb 2026 | Acquired by SpaceX Elon Musk merged xAI into SpaceX (a deal completed on February 2 according to Nevada filings), giving the AI lab access to SpaceX's capital ahead of a possible mega-IPO. | — |
| Jan 2026 | Growth xAI closed a $20 billion round led by Nvidia, above the initial $15 billion target, pushing its valuation past $230 billion to expand data centers and compute capacity. | $20B |
| Jul 2025 | Growth xAI raised $10B in combined debt and strategic equity to fund Grok and data-centre buildout. | $5B |
| Jul 2025 | Debt Debt component ($5 billion) of xAI's overall $10 billion raise, led by Morgan Stanley. | $5B |
| May 2024 | Series B xAI, Elon Musk's AI startup, is closing about $6B in funding at an $18B pre-money valuation, with Sequoia and Future Ventures participating. | $6B |
| Dec 2023 | Funding round Elon Musk AI venture xAI disclosed in an SEC filing it had raised about $135M toward a $1B target. | $135M |
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