In a move intended to maintain the integrity of data that helps guide the decisions of MBS investors, the Financial Industry Regulatory Authority last week fined Citigroup Global Markets $3.5 million for allegedly providing “inaccurate mortgage performance information, supervisory failures and other violations” in connection with subprime residential MBS. “Citigroup posted data for its RMBS deals that it should have known was inaccurate; and even after they learned that the data was inaccurate, Citigroup did not correct the problem until years later,” said Brad Bennett, FINRA executive vice president and...