Proximus SA

Board/Management Information • Dec 17, 2025

Press release

Brussels, 17 December 2025, 8.00 CET – Regulated and inside information

Mark Reid, Proximus Group CFO, has decided to leave Proximus

Proximus Group announces that Mark Reid will leave the company at the end of January 2026 to pursue other career opportunities in the UK.

Mr. Reid joined Proximus in May 2021. Before that, he held different Senior Financial roles in British Airways, Travelport, Yahoo and the Liberty Global group and has worked in Switzerland, UK & the US.

He played a crucial role in the execution of the #inspire2022 strategy by bringing Domestic operations back to top line and EBITDA growth as of 2022.

In the frame of the #bold2025 strategy, Mr. Reid and his team not only realised consistently strong financial performances in a context of increasing market competition and material investment needs to build the gigabit network of the future in Belgium, but he also executed a rigorous M&A strategy leading the Group to a successful divestment program of around EUR 500 million' by the end of 2025.

After the creation of Proximus Global, at the beginning of 2025, he also took on the responsibilities of Proximus Global CEO ad interim between April and November with his characteristic drive and dedication.

Mr. Reid will leave the company at the end of January 2026 and, in the meantime, Nicolas Gaertner, currently deputy CFO, will take up the CFO role ad interim as of January 15th to ensure a smooth transition until a final appointment will be announced.

Stijn Bijnens, CEO of the Proximus Group:

"Together with the Board and my colleagues from the Proximus Leadership Squad, I would like to thank Mark for his major contribution to the financial growth and health of Proximus, in a period of an unseen CAPEX investment program in our fiber network. With his team, he equally showed courage and determination to implement a considerable domestic divestment program. And for sure, I want to thank Mark for taking on ad interim the CEO role at Proximus Global till November. We wish Mark a lot of success in his new endeavors. "

Further information at: www.proximus.com/press

Press team: +32 2 202 44 44

Haroun Fenaux +32 476 60 03 33 Fabrice Gansbeke +32 472 050 702

E-mail: press@proximus.com

About Proximus Group

Proximus Group (Euronext Brussels: PROX), is a provider of future-proof connectivity, IT and digital services, headquartered in Brussels. The Group is actively engaged in building a connected world that people trust, so society blooms.

The Domestic segment is focused on providing state-of-the art telecommunications and IT services in the Benelux. In Belgium, core products and services are offered under the Proximus, Mobile Vikings and Scarlet brands for the residential market and Proximus NXT for the Enterprise market. The Group is also active in the Netherlands (Proximus NXT) and in Luxembourg (Tango and Proximus NXT).

Proximus Global overarches the international activities of the Group, gathering the strengths of BICS, Telesign and Route Mobile. Encompassing the entire value chain from P2P Voice & Messaging and Mobility services to CPaaS and Digital Identity, Proximus Global is in a unique position to become a global digital communications leader.

The Group has the ambition to build the #1 gigabit network for Belgium and plays a central role in creating inspiring digital ecosystems, while fostering an engaging culture and empowering ways of working. Building upon these strengths, Proximus aims to contribute to an inclusive and sustainable digital society, delight customers with an unrivalled experience and achieve profitable growth both locally and internationally to deliver long-term value for stakeholders.

With 13,131 employees, imbued with Proximus' Think Possible mindset and all engaged to offer a superior customer experience, the Group realized an underlying Group revenue of EUR 6,430 million end-2024.

For more information, visit www.proximus.com & www.proximus.be.