Shoshanna Solomon is The Times of Israel's Startups and Business reporter Skyscrapers and NASDAQ building of Times Square on July 29, 2017 in New York, NY (lucky-photographer; iStock by Getty Images) Tel Aviv-based IronSource, an advertising technology firm, is in talks with Thoma Bravo to go public through a merger via a special acquisition company (SPAC) with the US investment fund, Bloomberg reported on Monday citing people with knowledge of the matter. Thoma Bravo Advantage, the blank check firm, is seeking to raise about $1 billion in new equity to support a transaction that values the merged entities at more than $10 billion, Bloomberg said.