(March 14, 2017, 8:55 AM EDT) -- HOUSTON — Shareholders in a securities class action lawsuit against an energy company, several of its executive officers and directors and others may amend their complaint to add a claim for relief because their motion was filed prior to the deadline for amendments and amendment would not be futile, a federal judge in Texas ruled March 10 in granting the motion (In re Cobalt International Energy Inc. Securities Litigation, No. 14-3428, S.D. Texas; 2017 U.S. Dist. LEXIS 34437)....