By John Revill and Shayndi Raice 

ZURICH--Sunrise Communications AG on Wednesday confirmed it planned to file an initial public offering that would raise about 1.35 billion Swiss francs ($1.33 billion) in the latest shuffling of ownership in Switzerland's telecommunications market.

Zurich-based Sunrise, Switzerland's second-biggest telecommunications company by revenue, said it expected to complete a listing on the Swiss SIX Exchange during the first half of 2015, confirming reports in The Wall Street Journal late on Tuesday. The company said the proceeds would be used to reduce debts incurred investing in its mobile phone network.

Private equity company CVC Capital Partners has owned Sunrise since October 2010. The investment group plans to retain a stake after the IPO.

The Wall Street Journal reported late Tuesday the deal would value the Swiss telecoms provider at about 5 billion francs, with shares likely to start trading in early-to-mid February.

The planned listing comes amid a shake-up in the Swiss telecommunications industry. In December, French telecom tycoon Xavier Niel agreed to buy Orange Switzerland from Apax Partners in a deal worth nearly $3 billion.

Mr. Niel's entry into the Swiss market, which is dominated by government-controlled Swisscom AG, is expected to introduce more competitive pricing.

The Sunrise flotation would also be the largest initial public offering in the Alpine country for almost nine years, since oil refiner Petroplus Holdings AG raised 2.89 billion francs in 2006.

The Sunrise IPO would mark Europe's largest telecom offering since 2012, according to Dealogic, and would also be one of the larger European IPOs in recent years, as the market has been stifled by economic weakness and financial volatility on the continent.

IPO volume reached $14.7 billion in telecom, media and technology in the European region in 2014, more than triple the year-earlier total, according to Dealogic, amid a broad resurgence in deal activity around the world. Such offerings represented 17% of all IPOs in the region in 2014, compared with 10% the year before.

CVC, which holds 90% of Sunrise, will see its stake diluted by the sale, but will "probably remain the most important stakeholder in any case," Sunrise Chief Financial Officer André Krause said during a conference call.

Sunrise said it would provide details on share pricing closer to the time of listing.

Write to John Revill at john.revill@wsj.com and Shayndi Raice at shayndi.raice@wsj.com

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