 TEL AVIV, Israel and SAN FRANCISCO, April 7, 2021 PRNewswire -- ironSource, a leading business platform for the app economy, today announced that it has filed a registration statement on Form F-4 the registration statement with the U.S. Securities and Exchange Commission SEC. The registration statement contains a preliminary proxy statementprospectus in connection with ironSources previously announced proposed business combination with Thoma Bravo Advantage NYSE: TBA TBA, a publicly traded special purpose acquisition company. 