LEI: 549300PT2CIHYN5GWJ21

Serco Group plc

(Serco or the Company)

Total Voting Rights and Capital

In accordance with the Financial Conduct Authority's (FCA) Disclosure Guidance and Transparency Rules, the Company notifies that its total issued share capital as at 31 December 2025 comprised 1,002,743,103 Ordinary Shares of 2 pence each. The Company does not hold any Ordinary Shares in Treasury.

The total number of Ordinary Shares with voting rights was therefore 1,002,743,103, which may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the Company under the FCA's Disclosure Guidance and Transparency Rules.

Amanda Miller

Group General Counsel and Company Secretary

31 December 2025

For further information please contact:

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

Scot Marchbank, Group Communications and Marketing 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 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.