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 May 2025 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 . . . . . . . .

16 May 2025 Santander UK Group Holdings plc and Santander UK plc – Chair Appointment Santander UK Group Holdings plc and Santander UK plc (the “Companies”) announce the appointment of Sir Thomas Scholar (“Tom”) as an Independent Non-Executive Director and Chair Designate. Tom has joined the Board with immediate effect and will succeed William Vereker as Chair of the Companies on 1 AugustWashington, ~~at which point William will stand down from the Board~~D. Santander Group Executive Chair Ana Botín said: “Tom’s experience and insight from his time in Whitehall, the IMF, and the World Bank will be of huge value, and I am delighted to welcome him to Santander UKC. He joins us at an exciting time for the UK business as we continue to drive forward our transformation programme and integrate Santander UK with the group’s global platforms. On behalf of the Group Board, I would also like to express my thanks for William’s great contributions throughout his tenure. He helped to guide the bank through one of the most challenging periods faced by the financial sector in recent years and has ensured it is now well placed to build on the momentum generated over the last year.” Sir Tom Scholar said: “I am delighted to be joining Santander UK, and look forward to supporting the Board and the Executive Committee as they lead the bank through the next stages of its transformation.” Tom is a former Senior Civil Servant who spent the majority of his career with HM Treasury at the centre of the UK economic and financial system, including serving as Second Permanent Secretary during the Financial Crisis and, latterly, as Permanent Secretary for six years to 2022. He also spent six years at the IMF and World Bank from 2001 to 2007, and served as the Chief of Staff and Principal Private Secretary to the Prime Minister 2007-2008. Tom is currently Chair of Nomura International plc, Nomura Bank International plc and Nomura (Europe) Holdings plc. - Ends - Additional information about Santander UK and Banco Santander Santander UK is a financial services provider in the UK that offers a wide range of personal and commercial financial products and services. At 31 December 2024, the bank had around 18,000 employees and serves around 14 million active customers, including 7 million digital customers via a nationwide 444 branch network, telephone, mobile and online banking. Santander UK is subject to the full supervision of the FCA and the PRA in the UK. Santander UK plc customers’ eligible deposits are protected by the FSCS in the UK. Banco Santander (SAN SM, STD US, BNC.LN) is a leading commercial bank, founded in 1857 and headquartered in Spain and one of the largest banks in the world by market capitalization. The group’s activities are consolidated into five global businesses: Retail & Commercial Banking, Digital Consumer Bank, Corporate & Investment Banking (CIB), Wealth Management & Insurance and Payments (PagoNxt and Cards). This operating model allows the bank to better leverage its unique combination of global scale and local leadership. Banco Santander aims to be the best open financial services platform providing services to individuals, SMEs, corporates, financial institutions and governments. The bank’s purpose is to help people and businesses prosper in a simple, personal and fair way. Banco Santander has a listing of its ordinary shares on the London Stock Exchange and Santander UK plc has preference shares listed on the London Stock Exchange. 20549

~~SIGNATURES Pursuant~~FORM 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 By: / s / Roz Rule Name: Roz Rule Title: Company Secretary Dated: May 19, 2025 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 July, 2025

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

☒

Form 40-F

☐

NOTICE OF OPTIONAL FULL REDEMPTION

TO HOLDERS OF

SANTANDER UK GROUP HOLDINGS PLC

1.532% Fixed Rate Resetting Notes Due 2026

CUSIP No: 80281LAM7; ISIN No: US80281LAM72* (the “Notes”)

July 18, 2025

NOTE: THIS NOTICE CONTAINS IMPORTANT INFORMATION THAT IS OF INTEREST TO THE REGISTERED HOLDERS AND BENEFICIAL OWNERS OF THE NOTES. IF APPLICABLE, ALL DEPOSITORIES, CUSTODIANS, AND OTHER INTERMEDIARIES RECEIVING THIS NOTICE ARE REQUESTED TO EXPEDITE RE-TRANSMITTAL TO THE REGISTERED HOLDERS AND BENEFICIAL OWNERS OF THE NOTES IN A TIMELY MANNER.

The Notes were issued pursuant to an amended and restated indenture dated as of April 18, 2017 between Santander UK Group Holdings plc, a public limited company incorporated and registered in England and Wales, as issuer (the “Issuer”) and Citibank, N.A., as trustee (the “Trustee,” as successor to Wells Fargo Bank, National Association pursuant to an agreement of resignation, appointment and acceptance dated March 4, 2021 among the Issuer, the Trustee and Wells Fargo Bank, National Association) (as amended and supplemented by a first supplemental indenture, dated as of November 3, 2017 and a fourth supplemental indenture dated as of August 21, 2020, the “Indenture”). Capitalized terms used and not defined herein have the meanings ascribed to them in the Indenture or, if not defined therein, the Notes.

NOTICE IS HEREBY GIVEN that, pursuant to Section 11.04 of the Indenture, the Issuer has elected to redeem and will redeem on August 21, 2025 (the “Redemption Date”) all of the remaining principal amount of the Notes outstanding at a price equal to 100% of the principal amount of the Notes, plus accrued and unpaid interest thereon to, but excluding the Redemption Date (the “Redemption Price”).

Holders of the Notes will be paid the Redemption Price upon presentation and surrender of their Notes for redemption at the following address:

By mail or overnight courier:

Citibank, N.A.

480 Washington Blvd, 30^th Floor, Jersey City, NJ 07310

Attention: Citibank Agency & Trust - Santander UK Group Holdings PLC

Upon receipt of funds for such purpose from the Issuer, the Paying Agent shall, on the Redemption Date, pay, in immediately available funds, the Redemption Price of such Notes to the registered Holder of all Notes outstanding, Cede & Co., the nominee for The Depository Trust Company (“DTC”), in accordance with applicable DTC procedures.

On the Redemption Date, (i) the Redemption Price will become due and payable on the Notes, (ii) unless the Issuer defaults in making payment of the Redemption Price, interest on the Notes shall cease to accrue on and after the Redemption Date and (iii) the only remaining right of the holder with respect to the Notes will be to receive payment of the Redemption Price upon surrender of the Notes to the Paying Agent.

*No representation is made as to the correctness of the CUSIP or ISIN number either as printed on the Notes or as contained in this Notice of Redemption and the holder should rely only on the other identification numbers printed on the Notes. This CUSIP number has been assigned to this issue by Standard and Poor’s Corporation and is included solely for the convenience of the holders. Neither the Issuer, the Trustee nor the Paying Agent or any of their agents shall be responsible for the selection or use of this CUSIP number, nor is any representation made as to its correctness on the bonds or as indicated in any redemption notice.

IMPORTANT TAX INFORMATION

EXISTING U.S. FEDERAL INCOME TAX LAW MAY REQUIRE BACKUP WITHHOLDING OF 24% OF ANY PAYMENTS TO HOLDERS PRESENTING THEIR SECURITIES FOR PAYMENTS WHO HAVE FAILED TO FURNISH A TAXPAYER IDENTIFICATION NUMBER, CERTIFIED TO BE CORRECT UNDER PENALTY OF PERJURY ON A COMPLETE AND VALID INTERNAL REVENUE SERVICE (“IRS”) FORM W-9 OR APPLICABLE FORM W-8 TO THE APPLICABLE PAYER OR WITHHOLDING AGENT. HOLDERS MAY ALSO BE SUBJECT TO A PENALTY OF $50.00 FOR FAILURE TO PROVIDE SUCH NUMBER.

Sincerely,

SANTANDER UK GROUP HOLDINGS PLC

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


	By:	/s/ Rebecca Nind
	Name:	Rebecca Nind
	Title:	Authorized Signatory


Date: July 18, 2025

Filing Compare · SANTANDER UK GROUP HOLDINGS PLC