S&P Downgrades Ultrapetrol (ULTR) to 'D' Amid Miss Interest Payment Jan 19, 2016 08:43AM
S&P Downgrades Ultrapetrol (ULTR) to 'CC' Following Missed Interest Payments Dec 15, 2015 03:49PM
S&P Cuts Ultrapetrol (ULTR) to 'B-'; Sees Continued Free Cash Flow Deficits Sep 15, 2015 10:09AM
S&P Assigns 'BB' Rating to Ultra Petroleum (ULTR); Outlook Stable Dec 2, 2013 01:15PM