Orange Belgium S.A.

Declaration of Voting Results & Voting Rights Announcements • Aug 31, 2015

Embargo until 31 August 2015 at 5:40 pm Regulated information

Transparency declaration

Brussels, 31 August 2015 – Mobistar hereby discloses information in accordance with Article 14 of the Law of 2 May 2007 and the related Royal Decree of 14 February 2008:

On 26 August 2015, Mobistar received a transparency declaration from Prudential Plc, stating that, as of 21 August 2015, M&G Investment Management holds 1,801,397 shares, representing 3 % of the total share capital of the Company.

An increase above (or decrease below) the following thresholds requires a declaration to Mobistar and the Financial Services and Markets Authority (FSMA):

• 1. 3 % statutory threshold, as set out by the articles of association of the Company;
• 1. 5 % or each multiple of 5 %, as set out by the Belgian law.

The complete text of this transparency declaration is also available on the « Shareholders & Investors » section of our website:

https://corporate.mobistar.be/en/financial-information/shareholders-investors.

Mobistar (EURONEXT BRUSSELS: MOBB) is one of the main actors on the telecommunications market in Belgium and Luxembourg. The company offers its residential customers postpaid and prepaid innovative mobile telecom products and services. On the business market, Mobistar operates DSL fixed network telephony and high-speed internet, acts as an integrated communications provider and offers a portfolio of mobility and connectivity services. Mobistar is also a wholesale provider, offering access to its infrastructure and service capabilities to its wholesale partners. Mobistar, with the Orange group as major shareholder, is listed on the Brussels Stock Exchange.

For more information, please contact: Investor relations: e-mail: ir@mail.mobistar.be Siddy Jobe: +32 (0)2 745 80 92 Follow us on Twitter: PressMobistar