High-frequency trading firm Virtu on Thursday postponed its planned initial public offering, a source tells CNBC. The move comes amid increased scrutiny over the trading practice and a broadly soft IPO market.
Virtu did not withdraw its S1 though, so it could decide to go public in the coming weeks or months, the source says.
Virtu and other trading firms that use high-frequency trading methods have come under closer inspection within the industry after journalist Michael Lewis' new book, "Flash Boys" drew attention to the practice.
Dow Jones first reported the news Thursday.