Disclosure of shareholding

In accordance with Art. 20 of the Federal Act on Stock Exchanges and Security Trading, Ascom Holding AG received the following notification:

I. Shareholder:

• Vontobel Holding AG, Gotthardstrasse 43, 8022 Zürich
• Contact person: Roger Studer
• Facts and circumstances triggering the obligation to notify: Execution or non-execution of financial instruments
• Date of the acquisition or sale which resulted in exceeding the threshold:

21 December 2007

II. Disclosure of purchase positions:

• Total shareholding: 2,28%
• Structure of participation:  
  • 820’159 nominal shares

III. Disclosure of sale positions (granted conversion and share purchase rights):

• Detailed information:
  • CH0024994862: 23'299’900 rights (Voting rights conferred: 1’614’683)
  • CH0026423795: 2'539’200 rights (Voting rights conferred: 253’920)
  • CH0028871108: 2'394’200 rights (Voting rights conferred: 239’420)
  • CH0031800128: 200’000 rights (Voting rights conferred: 20’000)
  • CH0033404804: 842’400 rights (Voting rights conferred: 84’240)

• Voting rights conferred (total): 2'212’263 (6,15%)

Ascom Holding AG

About Ascom

Ascom is an international solution provider with comprehensive technological know-how in Mission-Critical Communication. The company concentrates on the core areas of Wireless Solutions (high-value, customer-specific on-site communications solutions) and Security Solutions (applications for security, communication and control systems for infrastructure operators, public security institutions and the army). The company has subsidiaries in 17 countries and a workforce of some 2,000 employees worldwide. Ascom registered shares (ASCN) are listed on the SWX Swiss Exchange in Zurich.

This document does not constitute an offer or solicitation to subscribe for, purchase or sell any securities. This document is not being issued in the United States of America or the United Kingdom and should not be distributed in any jurisdiction in a manner where such distribution would not comply with regulatory requirements. In particular, this document may not be distributed into the United States, to United States persons or to publications with a general circulation in the United States. In addition, the securities of Ascom have not been and will not be registered in any jurisdiction outside Switzerland. The securities of Ascom may not be offered, sold or delivered and no solicitation to purchase such securities may be made within the United States or to U.S. persons absent an applicable exemption from the registration requirements of the United States securities laws or within any other jurisdiction and in a manner where such offer, sale, delivery or solicitation might not be in compliance with regulatory requirements (including the United Kingdom).