(Telecompaper) Swiss operator Sunrise has launched its initial public offering (IPO) on the SIX Swiss Exchange with a share price range set at CHF 58-78. The price range implies a market capitalisation of CHF 2.8-3.3 billion and primary proceeds of around CHF 1.35 billion. The operator will be offering 17.3-23.3 million shares issued by itself and 4.3 million from the selling shareholder. There will also be a greenshoe of up 4.1 million shares. Most of the IPO proceeds will go to strengthen the company's balance sheet and for future growth opportunities. The first day of trading is expected to take place on or before 6 February.