BRIEF-Blackstone Group LP reports 15 percent active stake in CVR Partners LP as of April 1, 2016 By: Reuters: Company News April 11, 2016 at 18:24 PM EDT * Blackstone Group LP Reports 15 pct active stake in CVR Partners LP As Of April 1, 2016 - SEC filing Read More >> Related Stocks: Blackstone Inc Cvr Partners LP