X0202 SCHEDULE 13G 0001721695 XXXXXXXX LIVE Class A ordinary shares, par value US$0.0000001 per share (the "Shares") 07/20/2026 0001899123 BITDEER TECHNOLOGIES GROUP G11448100 08 Kallang Avenue, Aperia tower 1, #09-03/04 U0 339509 Rule 13d-1(c) Citadel Securities GP LLC DE 0.00 8665701.00 0.00 8665701.00 8665701.00 N 4.4 HC OO The percentages reported in this Schedule 13G are based upon 198,913,731 Shares outstanding as of April 21, 2026 (according to the issuer's Form 20-F as filed with the Securities and Exchange Commission on April 30, 2026). Except as described in the preceding sentence, all Shares for the holdings of the reporting persons reported in this Schedule 13G are as of the opening of the market on July 27, 2026. Citadel Securities LLC DE 0.00 6664874.00 0.00 6664874.00 6664874.00 N 3.4 BD OO Citadel Securities Group LP DE 0.00 8665701.00 0.00 8665701.00 8665701.00 N 4.4 HC PN Citadel Advisors LLC DE 0.00 929841.00 0.00 929841.00 929841.00 N 0.5 IA HC OO Citadel Advisors Holdings LP DE 0.00 929841.00 0.00 929841.00 929841.00 N 0.5 HC PN Citadel GP LLC DE 0.00 929841.00 0.00 929841.00 929841.00 N 0.5 HC OO Kenneth Griffin X1 0.00 9595542.00 0.00 9595542.00 9595542.00 N 4.8 HC IN BITDEER TECHNOLOGIES GROUP 08 Kallang Avenue, Aperia tower 1, #09-03/04, Singapore 339509 This Schedule 13G is being jointly filed by Citadel Securities GP LLC ("CSGP"), Citadel Securities LLC ("Citadel Securities"), Citadel Securities Group LP ("CALC4"), Citadel Advisors LLC ("Citadel Advisors"), Citadel Advisors Holdings LP ("CAH"), Citadel GP LLC ("CGP"), and Mr. Kenneth Griffin (collectively with CSGP, Citadel Securities, CALC4, Citadel Advisors, CAH, and CGP, the "Reporting Persons") with respect to the Shares of the above-named issuer held of record by Citadel Securities, Citadel Multi-Asset Master Fund Ltd., a Cayman Islands company ("CMAM"), Citadel Securities Principal Strategies LLC, a Delaware limited liability company ("CSP"), and CRBU Holdings LLC, a Delaware limited liability company ("CRBH"). Such Shares may include other instruments exercisable for or convertible into Shares. CALC4 is the non-member manager of Citadel Securities, CSP and CRBH. CSGP is the general partner of CALC4. Citadel Advisors is the portfolio manager for CMAM. CAH is the sole member of Citadel Advisors. CGP is the general partner of CAH. Mr. Griffin is the President and Chief Executive Officer of CGP, and owns a controlling interest in CGP and CSGP. The address of each of the Reporting Persons is 830 Brickell Plaza, Miami, Florida 33131. Each of CSGP, Citadel Securities, Citadel Advisors, and CGP is organized as a limited liability company under the laws of the State of Delaware. Each of CALC4 and CAH is organized as a limited partnership under the laws of the State of Delaware. Mr. Griffin is a U.S. citizen. Y 1. Citadel Securities LLC may be deemed to beneficially own 6,664,874 Shares. 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own 8,665,701 Shares. 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own 929,841 Shares. 4. Mr. Griffin may be deemed to beneficially own 9,595,542 Shares. 1. The number of Shares that Citadel Securities LLC may be deemed to beneficially own constitutes 3.4% of the Shares outstanding. 2. The number of Shares that each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own constitutes 4.4% of the Shares outstanding. 3. The number of Shares that each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own constitutes 0.5% of the Shares outstanding. 4. The number of Shares that Mr. Griffin may be deemed to beneficially own constitutes 4.8% of the Shares outstanding. 1. Citadel Securities LLC: 0 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0 4. Mr. Griffin: 0 1. Citadel Securities LLC: 6,664,874 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 8,665,701 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 929,841 4. Mr. Griffin: 9,595,542 1. Citadel Securities LLC: 0 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0 4. Mr. Griffin: 0 1. Citadel Securities LLC: 6,664,874 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 8,665,701 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 929,841 4. Mr. Griffin: 9,595,542 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above 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 Citadel Securities GP LLC /s/ Seth Levy 07/27/2026 Citadel Securities LLC /s/ Seth Levy 07/27/2026 Citadel Securities Group LP /s/ Seth Levy 07/27/2026 Citadel Advisors LLC /s/ Seth Levy 07/27/2026 Citadel Advisors Holdings LP /s/ Seth Levy 07/27/2026 Citadel GP LLC /s/ Seth Levy 07/27/2026 Kenneth Griffin /s/ Seth Levy 07/27/2026 * Seth Levy is signing on behalf of Kenneth Griffin as attorney-in-fact pursuant to a power of attorney previously filed with the Securities and Exchange Commission, and hereby incorporated by reference herein. The power of attorney was filed as an attachment to a filing by Citadel Advisors LLC on Schedule 13G for Allakos Inc. on October 13, 2023.