ISS is to bring Europe's largest initial public offering so far this year, in a roughly Dkr15bn ($2.79bn) deal that values the Danish cleaning giant at as much as Dkr26.8bn.

The company Thursday said it will sell up to 133 million in new shares to raise around Dkr13.3bn in gross proceeds earmarked for paying down debt. Its current owners, EQT Partners and Goldman Sachs Group are selling additional shares to reap as much as Dkr1.7bn.