X0306 4 2015-08-20 0 0001379895 DYNEGY INC. DYN 0001620385 Petrone Sheree M. 601 TRAVIS STREET SUITE 1400 HOUSTON TX 77002 0 1 0 0 Executive Vice President Common Stock 2015-08-20 4 F 0 695 25.55 D 13790 D Common Stock 2015-08-20 4 P 0 3000 25.78 A 16790 D These restricted stock units were withheld by Issuer to pay the taxes applicable to the vesting of 2,146 units of restricted stock on August 20, 2015. Reflects closing stock price on August 20, 2015. Amount includes 2,145 restricted stock units that vest on August 20, 2016, 2,258 restricted stock units that vest in two annual equal installments beginning on March 3, 2016 and 5,782 restricted stock units that vest in three annual equal installments beginning on March 3, 2016. Heidi D. Lewis 2015-08-24