REG-Director/PDMR Shareholding

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LEI: 213800ZBKL9BHSL2K459

OSB GROUP PLC 
(the Company)

9 September 2025

Notification of Transactions of Persons Discharging Managerial
Responsibilities (PDMRs)

The Company announces the following transaction by a PDMR on 9 September 2025
in the Company’s ordinary shares of £0.01 each, which include the vesting,
exercise and sale of shares that had been granted pursuant to a Recruitment
Award made under the Company’s 2020 Deferred Share Bonus Plan (DSBP).

The following notification made under Article 19 of the UK Market Abuse
Regulation (UK MAR) relates to a transaction by a PDMR in the shares of the
Company.

 1. Details of the person discharging managerial responsibilities / person closely associated                                                            
 Name of natural person                                          Victoria Hyde                                                                           
 2. Reason for the notification                                                                                                                          
 a. Position/status                                              Chief Financial Officer                                                                 
 b. Initial notification/amendment                               Initial Notification                                                                    
 3. Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor                                        
 a. Full name of the entity                                      OSB GROUP PLC                                                                           
 b. Legal Entity Identifier code                                 213800ZBKL9BHSL2K459                                                                    
 4. Details of the transaction(s):                                                                                                                       
 a. Description of the financial instrument, type of instrument  Ordinary shares of £0.01 each                                                           
 Identification code                                             GB00BLDRH360                                                                            
 b. Nature of Transaction                                        1. Vesting of 1,361 Shares under the Recruitment Award                                  
                                                                 2. Sale of 645 Shares vested under (1) to cover tax liabilities and dealing costs       
 c. Price(s) and Volume(s)                                       Price                                       Volume                                      
                                                                 (1) Nil                                     1,361                                       
                                                                 (2) £5.3947286822                           645                                         
 d. Aggregated Information:                                      Aggregated volume   1. 1,361                                                            
                                                                 2. 645                                                                                  
                                                                   Aggregated price    1. Consideration Price: Nil                                       
                                                                 2. Total Sale Price: £3,479.60                                                          
 e. Date of transaction                                          9 September 2025                                                                        
 f. Place of transaction                                         (1) Outside a trading venue (2) London Stock Exchange, Main Market (XLON)               

OSB GROUP PLC

 Jess Petrie                                                                            t: 01634 848 944  
 Group Head of Governance & Secretariat                                                                   
                                                                                                          
 Investor relations                                                                                       
 Alexander Holcroft Group Director of Investor Relations Email: osbrelations@osb.co.uk  t: 01634 838973   
                                                                                                          
 Brunswick                                                                                                
 Robin Wrench / Simone Selzer                                                           t: 020 7404 5959  

Notes to Editors

About OSB GROUP PLCs

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 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