Magnetar Funds' CoreWeave Options Expire Worthless in Collar Arrangement

Magnetar Financial LLC and related entities reported the expiration of call and put options on CoreWeave, Inc. Class A Common Stock that were part of a collar arrangement. The options, originally entered into on August 21, 2025, expired unexercised and worthless on June 18, 2026, as CoreWeave's stock price closed between the call strike price of $155 and put strike price of $70. The filing covers multiple Magnetar funds including CW Opportunity LLC, Magnetar Capital Master Fund, Magnetar Constellation Master Fund, and others, with total underlying shares of approximately 1.6 million. All reporting entities disclaim beneficial ownership except to the extent of their pecuniary interest. The expiration represents the termination of derivative positions without any value realization.