LEI: 549300PT2CIHYN5GWJ21

5 March 2026

Serco Group plc

Share Repurchase Programme

Serco Group plc (the Company) today announces that, as outlined in the announcement of its 2026 Full Year Results on 5 March 2026, it intends to repurchase shares with a value of up to £75 million (the Programme).

This will occur during the period starting on 9 March 2026 and ending no later than 31 July 2026 (the Engagement Period). The aggregate number of shares acquired by the Company shall not exceed the balance of 81,273,394 shares remaining of the 102,385,524 shares authorised by shareholders at the 2025 Annual General Meeting. It is intended that any shares repurchased under the Programme will be transferred into treasury and subsequently cancelled.

The Company has entered into an agreement with RBC Europe Limited (RBC) under which RBC will manage the Programme for the Engagement Period. RBC will carry out the acquisition of ordinary shares in the Company for subsequent repurchase by the Company. RBC will make trading decisions in relation to the Programme independently of the Company. During any closed periods, the Company will have no power to invoke any changes to the Programme, and it will be executed at the sole discretion of RBC. This arrangement is in accordance with Chapter 9 of the Financial Conduct Authority's Listing Rules and the Company's general authority to repurchase shares.

The Programme will also be conducted in accordance with the parameters of the safe harbour provisions set out in: (i) Article 5(1) of Regulation (EU) 596/2014 (including the delegated and implementing acts adopted under it); and (ii) the provisions of Commission Delegated Regulation (EU) 2016/1052 with regard to regulatory technical standards for the conditions applicable to buyback programmes and stabilisation measures (in each case as they form part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018 as implemented, retained, amended, extended, re-enacted or otherwise given effect. There is no guarantee that the Programme will be implemented in full.

The Company intends to announce any purchase of Ordinary Shares under the Programme in line with the Financial Conduct Authority's Listing Rule 9.6.6, by no later than the end of the 7^th daily market session following the date of execution of such purchase.

Ends

For further information please contact:

Jamie Hastings, Head of Investor Relations | +44 (0) 7718 195 074 | jamie.hastings@serco.com

Scot Marchbank, External Communications and Director | +44 (0) 7958 675 706 | scot.marchbank@serco.com

About Serco

Serco brings together the right people, the right technology, and the right partners to create innovative solutions that make a positive impact and address some of the most urgent and complex challenges facing the modern world.

With a primary focus on serving governments globally, Serco's services are powered by more than 50,000 people working across defence, space, migration, justice, healthcare, mobility, and customer services.

Serco's core capabilities include service design and advisory, resourcing, complex programme management, systems integration, case management, engineering, and asset & facilities management.

Underpinned by Serco's unique operating model, Serco drives innovation and supports customers from service discovery through to delivery.

More information can be found at www.serco.com.