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[6-K] Santander UK plc Current Report (Foreign Issuer)

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Santander UK announced a board change: Mahesh Aditya was appointed as a Banco Santander, S.A. nominated Non-Executive Director of the Santander UK boards, effective 1 October 2025, replacing Dirk Marzluf who stepped down on 30 September 2025. The release notes Mahesh has served as Group Chief Risk Officer since 2023, joined Santander in 2017, and held roles including CEO of Santander Consumer USA until 2023 and US Chief Risk Officer earlier. The notice lists his board memberships at SHUSA, PagoNxt, Open Bank, and Santander Consumer Finance and highlights his 30+ years' experience in financial services and risk management.

Santander UK ha annunciato un cambio nel consiglio: Mahesh Aditya è stato nominato come Non-Executive Director dei consigli di Santander UK, nominato da Banco Santander, S.A., con effetto dal 1 ottobre 2025, sostituendo Dirk Marzluf che si è dimesso il 30 settembre 2025. Il comunicato riferisce che Mahesh ha ricoperto il ruolo di Group Chief Risk Officer dal 2023, è entrato in Santander nel 2017 e ha ricoperto ruoli tra cui CEO di Santander Consumer USA fino al 2023 e US Chief Risk Officer in precedenza. La nota elenca le sue partecipazioni nel consiglio a SHUSA, PagoNxt, Open Bank e Santander Consumer Finance e mette in evidenza la sua esperienza di oltre 30 anni nei servizi finanziari e nella gestione dei rischi.

Santander UK anunció un cambio en la junta: Mahesh Aditya fue nombrado como Director No Ejecutivo de las juntas de Santander UK, nominado por Banco Santander, S.A., con efecto a partir del 1 de octubre de 2025, sustituyendo a Dirk Marzluf, que dimitió el 30 de septiembre de 2025. El comunicado señala que Mahesh ha desempeñado el cargo de Group Chief Risk Officer desde 2023, se unió a Santander en 2017 y ocupó roles como CEO de Santander Consumer USA hasta 2023 y anteriormente US Chief Risk Officer. La nota lista sus membresías en la junta en SHUSA, PagoNxt, Open Bank y Santander Consumer Finance y destaca su experiencia de más de 30 años en servicios financieros y gestión de riesgos.

산탄데르 UK가 이사회 변경을 발표했습니다: 마헤시 아디티아가 산탄데르 UK 이사회에 지명된 비상근 이사로 2025년 10월 1일부로 임명되어 Dirk Marzluf의 후임으로 2025년 9월 30일에 물러났습니다. 공보에 따르면 마헤시는 2023년부터 그룹 최고 위험 책임자(Group Chief Risk Officer)로 재직했고 2017년 산탄데르에 합류했으며 2023년까지 Santander Consumer USA의 CEO 및 이전에는 미국 최고 위험 책임자 등 역할을 맡았다고 합니다. 공지는 SHUSA, PagoNxt, Open Bank, Santander Consumer Finance 이사회 구성원을 목록으로 하고 재무 서비스 및 위험 관리 분야에서 30년이 넘는 경력을 강조합니다.

Santander UK a annoncé un changement au sein du conseil : Mahesh Aditya a été nommé administrateur non exécutif des conseils de Santander UK, nommé par Banco Santander, S.A., à compter du 1er octobre 2025, en remplacement de Dirk Marzluf qui a démissionné le 30 septembre 2025. Le communiqué indique que Mahesh a occupé le poste de Group Chief Risk Officer depuis 2023, a rejoint Santander en 2017 et a occupé des postes dont celui de CEO de Santander Consumer USA jusqu'en 2023 et anciennement US Chief Risk Officer. L'avis répertorie ses mandats au conseil chez SHUSA, PagoNxt, Open Bank et Santander Consumer Finance et met en évidence ses plus de 30 ans d'expérience dans les services financiers et la gestion des risques.

Santander UK gab eine Veränderung im Vorstand bekannt: Mahesh Aditya wurde als von Banco Santander, S.A. nominiertes nicht-geschäftsführendes Vorstandsmitglied der Santander UK-Vorstände ernannt, wirksam ab dem 1. Oktober 2025, und ersetzt Dirk Marzluf, der am 30. September 2025 zurücktrat. Die Mitteilung vermerkt, dass Mahesh seit 2023 Group Chief Risk Officer war, 2017 zu Santander kam und Funktionen wie CEO von Santander Consumer USA bis 2023 und zuvor US Chief Risk Officer innehatte. Die Bekanntmachung listet seine Vorstandsmitgliedschaften bei SHUSA, PagoNxt, Open Bank und Santander Consumer Finance auf und betont seine über 30-jährige Erfahrung im Finanzdienstleistungs- und Risikomanagement.

سنتاندير UK أعلنت عن تغيير في المجلس: تم تعيين ماهش أديتيا كعضو مجلس إدارة غير تنفيذي مُرشّح من قبل بنك سانتاندر، S.A. لمجالس Santander UK، اعتباراً من 1 أكتوبر 2025، ليحل محل ديرك مارتزلوف الذي استقال في 30 سبتمبر 2025. تشير النشرة إلى أن ماهيش شغل منصب المدير الأعلى للمخاطر على مستوى المجموعة منذ 2023، وانضم إلى سانتاندر في 2017 وشغل مناصب منها الرئيس التنفيذي لـ Santander Consumer USA حتى 2023 والرئيس المخاطر الأعلى في الولايات المتحدة سابقاً. يذكر الإشعار عضويات المجلس لدى SHUSA وPagoNxt وOpen Bank وSantander Consumer Finance ويبرز خبرته التي تزيد عن 30 عاماً في الخدمات المالية وإدارة المخاطر.

桑坦德英国宣布董事会变动：由 Mahesh Aditya 被任命为 Banco Santander, S.A. 提名的 Santander UK 董事会非常任董事，自 2025 年 10 月 1 日起生效，接替 Dirk Marzluf 于 2025 年 9 月 30 日辞任。公告指出 Mahesh 自 2023 年起担任集团首席风险官，于 2017 年加入桑坦德，曾任 Santander Consumer USA 首席执行官 直至 2023 年，以及此前的美国首席风险官。通知还列出了他在 SHUSA、PagoNxt、Open Bank 和 Santander Consumer Finance 的董事会任职，并强调他在金融服务与风险管理领域超过 30 年的经验。

Positive
  • Appointment of Mahesh Aditya brings a senior risk specialist with Group Chief Risk Officer experience since 2023
  • Extensive experience: over 30 years in financial services and roles across Santander entities
  • Board continuity through an internal Banco Santander nomination, maintaining group oversight
Negative
  • Departure of Dirk Marzluf on 30 September 2025 removes a six-year board member
  • No additional governance detail provided about committee assignments or succession planning

Santander UK ha annunciato un cambio nel consiglio: Mahesh Aditya è stato nominato come Non-Executive Director dei consigli di Santander UK, nominato da Banco Santander, S.A., con effetto dal 1 ottobre 2025, sostituendo Dirk Marzluf che si è dimesso il 30 settembre 2025. Il comunicato riferisce che Mahesh ha ricoperto il ruolo di Group Chief Risk Officer dal 2023, è entrato in Santander nel 2017 e ha ricoperto ruoli tra cui CEO di Santander Consumer USA fino al 2023 e US Chief Risk Officer in precedenza. La nota elenca le sue partecipazioni nel consiglio a SHUSA, PagoNxt, Open Bank e Santander Consumer Finance e mette in evidenza la sua esperienza di oltre 30 anni nei servizi finanziari e nella gestione dei rischi.

Santander UK anunció un cambio en la junta: Mahesh Aditya fue nombrado como Director No Ejecutivo de las juntas de Santander UK, nominado por Banco Santander, S.A., con efecto a partir del 1 de octubre de 2025, sustituyendo a Dirk Marzluf, que dimitió el 30 de septiembre de 2025. El comunicado señala que Mahesh ha desempeñado el cargo de Group Chief Risk Officer desde 2023, se unió a Santander en 2017 y ocupó roles como CEO de Santander Consumer USA hasta 2023 y anteriormente US Chief Risk Officer. La nota lista sus membresías en la junta en SHUSA, PagoNxt, Open Bank y Santander Consumer Finance y destaca su experiencia de más de 30 años en servicios financieros y gestión de riesgos.

산탄데르 UK가 이사회 변경을 발표했습니다: 마헤시 아디티아가 산탄데르 UK 이사회에 지명된 비상근 이사로 2025년 10월 1일부로 임명되어 Dirk Marzluf의 후임으로 2025년 9월 30일에 물러났습니다. 공보에 따르면 마헤시는 2023년부터 그룹 최고 위험 책임자(Group Chief Risk Officer)로 재직했고 2017년 산탄데르에 합류했으며 2023년까지 Santander Consumer USA의 CEO 및 이전에는 미국 최고 위험 책임자 등 역할을 맡았다고 합니다. 공지는 SHUSA, PagoNxt, Open Bank, Santander Consumer Finance 이사회 구성원을 목록으로 하고 재무 서비스 및 위험 관리 분야에서 30년이 넘는 경력을 강조합니다.

Santander UK a annoncé un changement au sein du conseil : Mahesh Aditya a été nommé administrateur non exécutif des conseils de Santander UK, nommé par Banco Santander, S.A., à compter du 1er octobre 2025, en remplacement de Dirk Marzluf qui a démissionné le 30 septembre 2025. Le communiqué indique que Mahesh a occupé le poste de Group Chief Risk Officer depuis 2023, a rejoint Santander en 2017 et a occupé des postes dont celui de CEO de Santander Consumer USA jusqu'en 2023 et anciennement US Chief Risk Officer. L'avis répertorie ses mandats au conseil chez SHUSA, PagoNxt, Open Bank et Santander Consumer Finance et met en évidence ses plus de 30 ans d'expérience dans les services financiers et la gestion des risques.

Santander UK gab eine Veränderung im Vorstand bekannt: Mahesh Aditya wurde als von Banco Santander, S.A. nominiertes nicht-geschäftsführendes Vorstandsmitglied der Santander UK-Vorstände ernannt, wirksam ab dem 1. Oktober 2025, und ersetzt Dirk Marzluf, der am 30. September 2025 zurücktrat. Die Mitteilung vermerkt, dass Mahesh seit 2023 Group Chief Risk Officer war, 2017 zu Santander kam und Funktionen wie CEO von Santander Consumer USA bis 2023 und zuvor US Chief Risk Officer innehatte. Die Bekanntmachung listet seine Vorstandsmitgliedschaften bei SHUSA, PagoNxt, Open Bank und Santander Consumer Finance auf und betont seine über 30-jährige Erfahrung im Finanzdienstleistungs- und Risikomanagement.

Page 1 of 3 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 October 2025 Commission File Number 001-14928 SANTANDER UK 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 . . . . . . . .

 
Page 2 of 3 3 October 2025 Santander UK Group Holdings plc and Santander UK plc (together "Santander UK") BOARD CHANGES Santander UK today announces that Mahesh Aditya has been appointed as a Banco Santander, S.A. nominated Non-Executive Director of the Santander UK Boards, effective from 1 October 2025. He replaces Dirk Marzluf who stepped down from the Boards of Santander UK with effect from 30 September 2025. Santander UK Chairman, Tom Scholar said: “I am delighted to welcome Mahesh to the Boards of Santander UK. Mahesh will bring a breadth of experience to the Board, including in depth knowledge of risk management in banking during a period of strategically important transformation for Santander UK. Dirk has been a highly valued member of the Board during his six year tenure and I would like to thank him for his contribution to Santander UK in that time.” - Ends - For media enquiries, please contact: Stewart Todd Head of Communications mediarelations@santander.co.uk Notes to Editors: Mahesh Aditya Mahesh has been Santander’s Group Chief Risk Officer since 2023. Mahesh joined Santander in 2017 as Chief Operating Officer of Santander Holdings USA, Inc (SHUSA) and took the position of US Chief Risk Officer in 2018 until 2019 when he became Santander Consumer USA CEO, holding that position until 2023. Mahesh has over 30 years’ experience in financial services with particular focus on international markets Risk Management. He specialises in building organisations, establishing control processes, project management and managing through a variety of regulatory environments. Mahesh is a director of the SHUSA, PagoNxt, S.L., Open Bank, S.A. and Santander Consumer Finance, S.A. Boards. 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. The bank serves its customers via a nationwide 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 capitalisation. 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.

 
Page 3 of 3 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 PLC By: / s / Roz Rule Name: Roz Rule Title: Company Secretary Dated: October 3, 2025

 

Source: View Original Filing on SEC EDGAR

FAQ

What change did Santander UK (SNTUF) announce in this 6-K?

Santander UK announced the appointment of Mahesh Aditya as a Banco Santander-nominated Non-Executive Director, effective 1 October 2025, replacing Dirk Marzluf.

When did Dirk Marzluf step down from the Santander UK boards?

The filing states Dirk Marzluf stepped down from the Santander UK boards with effect from 30 September 2025.

What are Mahesh Aditya's relevant roles and experience listed in the filing?

Mahesh has been Group Chief Risk Officer since 2023, previously served as CEO of Santander Consumer USA until 2023, and has over 30 years of financial services experience.

Does the filing state any changes to Santander UK's regulatory or customer protections?

No. The filing reiterates that Santander UK is supervised by the FCA and PRA and that customer deposits are protected by the FSCS, with no changes announced.

Are there details on committee assignments or further governance actions?

No. The announcement does not disclose committee roles, board committee changes, or additional governance details.
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[6-K] Santander UK plc Current Report (Foreign Issuer)

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