Jan 29 (Reuters) - Encyclopaedia Britannica said on Monday it had confidentially filed for an initial public offering in the United States.

The number of shares to be sold in the IPO and the price range have not been determined, the company said.

Companies sometimes file confidentially for IPOs to keep their financial details private for longer. (Reporting by Niket Nishant in Bengaluru; Editing by Shweta Agarwal)