Magnetar Financial SC 13G/AHealthwell Acquisition Corp. I / Magnetar Financial ownership change

EXHIBIT 99.1

JOINT FILING AGREEMENT

The undersigned hereby agree that the statement on Schedule 13G with respect to the Shares of HEALTHWELL ACQUISITION CORP. I dated as of December 31, 2023 is, and any amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the previsions of Rule13d-1(k) under the Securities Exchange Act of 1934, as amended.