LEI: 213800ZBKL9BHSL2K459

23 March 2026

OSB GROUP PLC
(the Company)

Notification of Transactions of Persons Discharging Managerial Responsibilities (PDMRs)

The Company notifies the following changes in the interests in the ordinary shares of £0.01 each (Shares) of the Company of the PDMRs arising from awards granted under the Performance Share Plan (PSP) on 23 March 2026 (the Award Date). The number of Shares subject to the awards has been calculated by reference to the average closing share price of the Company over the three dealing days prior to the Award Date (£5.49).

The purpose of the DSBP is to facilitate the deferral of part of a participant’s annual bonus into Shares. Awards to Executive Directors cannot be sold for at least three years after grant. DSBP awards will not be subject to performance conditions.

The PSP awards are based on return on tangible equity, relative total shareholder return, a risk-based measures and an ESG measure. The performance targets will be measured over three financial years (1 January 2026 – 31 December 2028). To the extent that the awards vest, they will vest 75% on the third anniversary of the Award Date and 25% vesting on the fourth anniversary of the Award Date. A post-vesting holding period will then apply to each tranche to ensure that there is a period of five years between grant and release. Clawback and malus provisions apply to these awards.

Name	Number of Shares subject to award
PDMRs
	Deferred Share Bonus Plan	PSP	TOTAL
Andrew Golding	61,698	189,179	250,877
Victoria Hyde	37,018	-	37,018

The Company intends to grant Victoria Hyde’s 2026 PSP later this year following proposed amendments to the Company’s Remuneration Policy.

The following disclosures are made in accordance with Article 19 of the UK Market Abuse Regulation.

1. Details of the person discharging managerial responsibilities / person closely associated
Name of natural person	Andrew Golding
2. Reason for the notification
Position/status	Chief Executive Officer
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	Grant of awards
c. Price(s) and Volume(s)	Price	Volume
	Nil	250,877
d. Aggregated Information:	Aggregated volume 250,877 Aggregated price Nil
e. Date of transaction	23 March 2026
f. Place of transaction	Outside a trading venue

Details of the person discharging managerial responsibilities / person closely associated
Name of natural person	Victoria Hyde
2. Reason for the notification
Position/status	Chief Financial Officer
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	Grant of awards
c. Price(s) and Volume(s)	Price	Volume
	Nil	37,018
d. Aggregated Information:	Aggregated volume 37,018 Aggregated price Nil
e. Date of transaction	23 March 2026
f. Place of transaction	Outside a trading venue

Enquiries:

Jess Petrie	t: 01634 848 944
Group Head of Governance
Investor relations
Alexander Holcroft Group Head of Investor Relations Email: [email protected]	t: 01634 838973
Brunswick
Robin Wrench / Simone Selzer	t: 020 7404 5959

Notes to Editors

About OSB GROUP 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 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.