Madame Tussauds owner Merlin Entertainments said on Wednesday it expects to be valued at as much as 3.3 billion pounds when it makes its London stock market debut next month.

Private-equity backed Merlin, which operates 99 attractions in 22 countries, said 20 percent to 30 percent of the company would be sold in the listing, in which it is offering its shares at between 280 pence to 330 pence each.