Citadel Discloses 5.5% Stake in Core Scientific, Adding to Recent Bitcoin Mining, AI Positions

Market-making giant Citadel Securities Group has accumulated a 5.5% passive stake in Core Scientific, marking the second major bitcoin miner and HPC data center position the firm has reported this week.

Core Scientific’s filing on Wednesday shows Citadel Securities and affiliated principal-strategies vehicles collectively own 17.2 million Core Scientific shares. The position is held predominantly across Citadel Securities’ trading and market-making entities rather than through Citadel Advisors, the hedge-fund arm, indicating the exposure stems from proprietary trading and liquidity-provision activities that crossed the SEC’s 5% reporting threshold.

The disclosure follows a separate filing made Monday in which Citadel reported a 5.4% passive stake in TeraWulf. That earlier position came shortly after TeraWulf unveiled a colocation and high-performance computing partnership with Fluidstack, reflecting miners’ broader shift toward AI-oriented compute infrastructure as bitcoin hashprice falls to historical lows.

The two disclosures highlight growing involvement by large multi-strategy trading firms in bitcoin-mining equities, particularly as liquidity in the sector improves and miners diversify into energy-dense workloads beyond bitcoin production. Core Scientific was one of the first large North American bitcoin mining firms to announce multi-year HPC colocation leases to diversify beyond bitcoin mining.