Mealey's (April 4, 2018, 2:29 PM EDT) -- HOUSTON — Shareholders in a securities class action lawsuit against an oil and gas company, several of its affiliates and senior officers and underwriters of various stock offerings have failed to cure their pleading deficiencies that led to prior dismissal of the suit and, therefore, have failed to state any claim for relief, a federal judge in Texas ruled April 2 in dismissing the lawsuit with prejudice and denying leave to amend (In re Plains All American Pipeline L.P. Securities Litigation, No. 15-2404, S.D. Texas, 2018 U.S. Dist. LEXIS 56013)....