InvestmentsTop Global NewsMarketsReal Estate Language learning app Duolingo files for US IPO By financialnews_rlv83x - June 28, 2021 0 114 REUTERS: Language learning app Duolingo Inc on Monday filed for an initial public offering in the United States. (Reporting by Niket Nishant in Bengaluru; Editing by Devika Syamnath)