Citadel takes 5.4% stake in TeraWulf for market-making purposes

Group 1 - Citadel disclosed a 5.4% passive stake in TeraWulf (NASDAQ: WULF) as of December 1, 2025, with an aggregate beneficial ownership of 22.7 million shares [1] - The majority of Citadel's stake is held through its capital markets arm, Citadel Securities, which uses the firm's own capital for market-making inventory [1] - Citadel Advisors and Citadel GP, the hedge fund arm, only own 112,900 shares of WULF, indicating a distinction between the firm's market-making and investment strategies [2] Group 2 - Citadel Securities operates as a market maker and liquidity provider, holding positions in other bitcoin miners such as IREN and HIVE, with IREN valued at $560.8 million and HIVE at $13.1 million [3] - Market makers like Citadel profit from the bid-ask spread while ensuring smooth trading and preventing large price swings, acting as intermediaries [2]