X0306 4 2017-03-08 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 2017-03-08 4 M 0 5709 A 41381 D Common Stock 2017-03-08 4 F 0 1735 7.62 D 39646 D Restricted Stock Units 2017-03-08 4 M 0 5709 0.00 D Common Stock 5709 11419 D Each restricted stock unit is the economic equivalent of one share of Dynegy Inc. common stock. These restricted stock units were withheld to pay the taxes applicable to the vesting of 5,709 units of restricted stock on March 8, 2017. Reflects closing stock price on March 8, 2017. Amount includes 1,927 restricted stock units that vest on March 3, 2018 and 21,821 restricted stock units that vest in three annual equal installments beginning on March 1, 2018. On March 8, 2016, the reporting person was granted 17,128 restricted stock units representing the contingent right to receive for each restricted stock unit one share of Dynegy Inc. common stock or the cash equivalent of one share of common stock. The restricted stock units vest in three annual equal installments beginning on March 8, 2017. /s/ Heidi D. Lewis, Attorney-in-Fact 2017-03-09