SCHEDULE 13G 0001535978 XXXXXXXX LIVE Class A Ordinary Shares, par value $0.0001 per share 12/31/2025 0002082149 Daedalus Special Acquisition Corp. G2616C124 50 SLOANE AVENUE LONDON X0 SW3 3DD Rule 13d-1(b) Adage Capital Management, L.P. DE 0.00 1800000.00 0.00 1800000.00 1800000.00 N 7.01 IA PN Robert Atchinson X1 0.00 1800000.00 0.00 1800000.00 1800000.00 N 7.01 HC IN Phillip Gross X1 0.00 1800000.00 0.00 1800000.00 1800000.00 N 7.01 HC IN Daedalus Special Acquisition Corp. 50 Sloane Avenue, London, SW3 3DD, United Kingdom This statement is filed by: (i) Adage Capital Management, L.P., a Delaware limited partnership ("ACM"), as the investment manager of Adage Capital Partners, L.P., a Delaware limited partnership ("ACP"), with respect to the Class A ordinary shares, par value $0.0001 per share ("Class A Ordinary Shares") of Daedalus Special Acquisition Corp., a Cayman Islands exempted company (the "Company") directly held by ACP; (ii) Robert Atchinson ("Mr. Atchinson"), as (1) managing member of Adage Capital Advisors, L.L.C., a limited liability company organized under the laws of the State of Delaware ("ACA"), managing member of Adage Capital Partners GP, L.L.C., a limited liability company organized under the laws of the State of Delaware ("ACPGP"), general partner of ACP and (2) managing member of Adage Capital Partners LLC, a Delaware limited liability company ("ACPLLC"), general partner of ACM, with respect to the Class A Ordinary Shares directly held by ACP; and (iii) Phillip Gross ("Mr. Gross"), as (1) managing member of ACA, managing member of ACPGP and (2) managing member of ACPLLC, general partner of ACM, with respect to the Class A Ordinary Shares directly held by ACP. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party. The filing of this statement should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of the securities reported herein. The Class A Ordinary Shares have no CUSIP number. The CUSIP number for the units which include the Class A Ordinary Shares is G2616C124. The address of the business office of each of the Reporting Persons is 200 Clarendon Street, 52nd Floor, Boston, Massachusetts 02116. ACM is a limited partnership organized under the laws of the State of Delaware. Messrs. Gross and Atchinson are citizens of the United States. N IA HC The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 25,685,000 Class A Ordinary Shares outstanding, as reported in the Company's Prospectus filed pursuant to Rule 424(b)(4) with the Securities and Exchange Commission on December 10, 2025 and in the Company's Current Report on Form 8-K filed with the Securities and Exchange Commission on December 11, 2025, after giving effect to the completion of the offering, the consummation of the simultaneous private placement and the partial exercise of the underwriters' over-allotment option, all as described therein. 7.01% The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference. Y N See Item 2(a). Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Exhibit 99.1: Joint Filing Agreement Adage Capital Management, L.P. /s/ Robert Atchinson 02/12/2026 Robert Atchinson /s/ Robert Atchinson 02/12/2026 Phillip Gross /s/ Phillip Gross 02/12/2026