Citadel Advisors, Ken Griffin’s hedge fund, disclosed in its Q2 2026 13F filing new positions in SpaceX, Cerebras Systems, and Quantinuum, three companies operating in aerospace, advanced AI hardware, and quantum computing. The firm’s equity portfolio surged 41.5% to $875.1 billion, representing a $256 billion increase in a single quarter. Cerebras Systems raised $6.4 billion in its Nasdaq IPO in June 2026, valuing the company at approximately $23 billion. Quantinuum reached a $10 billion pre-money valuation in 2025. The exact position sizes for Citadel’s stakes in these three companies were not specified in the 13F filing, which is typical for holdings in private securities.
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