X0202 SCHEDULE 13D/A 0001441449-25-000008 0001441449 XXXXXXXX LIVE 3 Class A Common Stock, par value $ 0.0001 per share 09/29/2026 0001820872 37890B100 Global Business Travel Group, Inc.

666 THIRD AVENUE NEW YORK NY 10017

Qatar Investment Authority 0097444990696 Ooredoo Tower (Building 14) Al Dafna St, 801 Al Dafna Zone 61 Doha S3 23224 0001441449 N Qatar Investment Authority b OO S3 0.00 0.00 0.00 0.00 0.00 0.0 OO Class A Common Stock, par value $ 0.0001 per share Global Business Travel Group, Inc. 666 THIRD AVENUE NEW YORK NY 10017 This Amendment No. 3 to the Schedule 13D (the "Amendment No. 3") amends and supplements the Schedule 13D filed by the Reporting Person with the SEC on October 2, 2025 (the "Schedule 13D"), as amended by Amendment No. 1, dated May 4, 2026 (the "Amendment No. 1") and Amendment No. 2, dated June 29, 2026 (the "Amendment No. 2"). Except as amended and supplemented by the Amendment No. 1, the Amendment No. 2 and the Amendment No. 3, the Schedule 13D remains unchanged. Item 4 of the Schedule 13D is hereby supplemented and amended to add the following information: On September 29, 2026, the Issuer, Gaia Purchaser, Inc., a Delaware corporation ("Parent"), and Gaia Merger Sub, Inc., a Delaware corporation ("Merger Sub"), completed the previously announced transactions contemplated by that certain Agreement and Plan of Merger, dated as of May 2, 2026 (the "Merger Agreement"), by and among the Issuer, Parent and Merger Sub. Upon the consummation of the transactions contemplated by the Merger Agreement (and on the terms and subject to the conditions set forth therein), among other things, (a) Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer surviving the Merger as the surviving corporation and as a wholly-owned subsidiary of Parent, (b) upon the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the Merger (the "Effective Time"), each share of Class A common stock, par value $0.0001 per share, of the Company ("Company Common Stock") issued and outstanding as of immediately prior to the Effective Time (other than shares excluded or treated as set forth in the Merger Agreement) was automatically cancelled, extinguished and converted into the right to receive cash in an amount equal to $9.50, without interest thereon and (c) the Rollover Shares (as defined in that certain Rollover Agreement, dated as of June 27, 2026 (the "Rollover Agreement"), by and between QIA Retail Holding LLC ("QIA Retail"), a Qatar limited liability company and a wholly-owned subsidiary of the Reporting Person, and Gaia Purchaser Parent, LLC, a Delaware limited liability company ("Topco"), an indirect parent company of Parent), issued and outstanding immediately prior to the Effective Time were cancelled and, pursuant to the Rollover Agreement, QIA Retail was entitled to receive shares of the common stock of Topco in respect thereof. Prior to the Closing, QIA Retail held an aggregate amount of 87,659,000 shares of Company Common Stock, of which (x) immediately prior to the Effective Time, 31,278,962 shares of such Company Common Stock were contributed, transferred and assigned to Topco in accordance with the Rollover Agreement, and (y) at the Effective Time, the remaining 56,380,038 shares were each automatically cancelled, extinguished and converted into the right to receive cash in an amount equal to $9.50 in accordance with the Merger Agreement. As a result of the Merger and the transactions contemplated by the Rollover Agreement, the Reporting Person ceased to beneficially own any shares of Company Common Stock. The Voting and Support Agreement, dated as of May 3, 2026, entered into by and among QIA Retail, the Issuer, Parent, and Merger Sub, terminated automatically upon consummation of the Merger. Item 5 of the Schedule 13D is hereby supplemented and amended as follows: As a result of the consummation of the Merger and the transactions contemplated by the Rollover Agreement, as described in Item 4, the Reporting Person ceased to beneficially own any shares of Company Common Stock. (i) Sole power to vote or direct the vote: 0 (ii) Shared power to vote or direct the vote: 0 (iii) Sole power to dispose or direct the disposition: 0 (iv) Shared power to dispose or direct the disposition: 0 The Reporting Person has not effected any transactions in Class A Common Stock during the past sixty days. To the best knowledge of the Reporting Person, no person other than the Reporting Person has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities beneficially owned by the Reporting Person. Not applicable Item 6 of the Schedule 13D is hereby supplemented by incorporating by reference Item 4 of this Amendment No. 3. Qatar Investment Authority /s/ Mohammed Fahad Al Khulaifi 09/29/2026