Broker dealer Investment Technology Group said on Wednesday it set aside $20.3 million for a probable settlement with the U.S. Securities and Exchange Commission over rule violations related to its private stock trading venue. ITG said the SEC was investigating a test program one of the firm’s subsidiaries ran from 2010 until mid-2011 that involved proprietary trading inside of ITG’s POSIT dark pool against some of its broker clients that the firm did not disclose.