REG-Update in relation to the Group’s MREL requirements

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OSB GROUP PLC

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION

LEI: 213800ZBKL9BHSL2K459

19 December 2025

Update in relation to the Group’s MREL requirements

In its interim results for the six months ended 30 June 2025 published on 20
August 2025, OSB GROUP PLC (the “Group”) noted that it was seeking
clarification from the Bank of England in respect of the recently announced
changes to the minimum requirements for own funds and eligible liabilities
(“MREL”) regime.

We are pleased to note that the Bank of England has notified the Group that
its preferred resolution strategy for the Group effective from 1 January 2026,
will be as a transfer firm.

From 1 January 2026, OSB Group’s MREL is equal to minimum capital
requirements, defined as the sum of Pillar 1 and Pillar 2A capital
requirements, as set by the PRA.

The Group will update the market on what this means for its capital and
funding plans at its 2025 full year results, which will be announced on 5
March 2026.

Note

The person responsible for arranging the release of this announcement on
behalf of the Group is Jason Elphick, Group General Counsel and Company
Secretary. All enquiries should be directed to Investor Relations or Brunswick
Group, contact details below.

Enquiries:
Jason Elphick
Group General Counsel and Company Secretary
t: 01634 835 796

Investor relations
Alexander Holcroft
Group Director of Investor Relations
t: 01634 838 973

Brunswick Group
Robin Wrench / Simone Selzer
t: 020 7404 5959

Notes to Editors

About OSB GROUP PLC

OneSavings Bank plc (OSB) began trading as a bank on 1 February 2011 and was
admitted to the main market of the London Stock Exchange in June 2014 (OSB.L).
OSB joined the FTSE 250 index in June 2015. On 4 October 2019, OSB acquired
Charter Court Financial Services Group plc (CCFS) and its subsidiary
businesses. On 30 November 2020, OSB GROUP PLC became the listed entity and
holding company for the OSB Group. The Group provides specialist lending and
retail savings and is authorised by the Prudential Regulation Authority, part
of the Bank of England, and regulated by the Financial Conduct Authority and
Prudential Regulation Authority. The Group reports under two segments,
OneSavings Bank and Charter Court Financial Services.

OneSavings Bank (OSB)

OSB primarily targets market sub-sectors that offer high growth potential and
attractive risk-adjusted returns in which it can take a leading position and
where it has established expertise, platforms and capabilities. These include
private rented sector Buy-to-Let, commercial and semi-commercial mortgages,
residential development finance, bespoke and specialist residential lending,
secured funding lines and asset finance.

OSB originates mortgages organically via specialist brokers and independent
financial advisers through its specialist brands including Kent Reliance for
Intermediaries and InterBay Commercial. It is differentiated through its use
of highly skilled, bespoke underwriting and efficient operating model.

OSB is predominantly funded by retail savings originated through the
long-established Kent Reliance name, which includes online and postal channels
as well as a network of branches in the South East of England. Diversification
of funding is currently provided by securitisation programmes and the Bank of
England’s Term Funding Scheme with additional incentives for SMEs.

Charter Court Financial Services Group (CCFS)

CCFS focuses on providing Buy-to-Let and specialist residential mortgages,
mortgage servicing, administration and retail savings products. It operates
through its brands: Precise Mortgages and Charter Savings Bank.

It is differentiated through risk management expertise and best-of-breed
automated technology and systems, ensuring efficient processing, strong credit
and collateral risk control and speed of product development and innovation.
These factors have enabled strong balance sheet growth whilst maintaining high
credit quality mortgage assets.

CCFS is predominantly funded by retail savings originated through its Charter
Savings Bank brand. Diversification of funding is currently provided by
securitisation programmes and the Bank of England’s Term Funding Scheme with
additional incentives for SMEs