UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934 For the month of April, 2023 Commission File Number 001-37595 SANTANDER UK GROUP HOLDINGS PLC (Translation of registrant's name into English) 2 Triton Square, Regent's Place, London NW1 3AN, England (Address of principal executive office) Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F . . . .X. . . . Form 40-F . . . . . . . . THE REGISTRANT HEREBY INCORPORATES ALL PARTS, EXCEPT FOR “APPENDIX 2 - SUPPLEMENTARY CONSOLIDATED INFORMATION FOR SANTANDER UK PLC AND ITS CONTROLLED ENTITIES” ON PAGE 10, OF THIS REPORT ON FORM 6-K BY REFERENCE INTO REGISTRATION STATEMENT NO. 333-257705 FILED BY THE REGISTRANT WITH THE SECURITIES AND EXCHANGE COMMISSION ON FORM F-3ASR UNDER THE SECURITIES ACT OF 1933. The “Appendix 2 - Supplementary consolidated information for Santander UK plc and its controlled entities” on page 9 shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, and is not incorporated by reference into this Report on Form 6-K nor any filing of the registrant, whether made before or after the date hereof, regardless of any general incorporation language in such filing. In addition, this Report on Form 6-K contains references to websites of the registrant and its affiliates. The registrant is not incorporating by reference any information posted on such websites.
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SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. SANTANDER UK GROUP HOLDINGS PLC Dated: 26 April 2023 By / s / Duke Dayal Duke Dayal Chief Financial Officer