X0306 4 2017-03-08 0 0001379895 DYNEGY INC. DYN 0001530677 James Catherine C. 601 TRAVIS 14TH FLOOR HOUSTON TX 77002 0 1 0 0 Exec VP and General Counsel Common Stock 2017-03-08 4 M 0 9700 A 97467 D Common Stock 2017-03-08 4 F 0 4103 7.62 D 93364 D Restricted Stock Units 2017-03-08 4 M 0 9700 0.00 D Common Stock 9700 19401 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 9,700 units of restricted stock on March 8, 2017. Reflects closing stock price on March 8, 2017. Amount includes 3,854 restricted stock units that vest on March 3, 2018 and 37,095 restricted stock units that vest in three annual equal installments beginning on March 1, 2018. On March 8, 2016, the reporting person was granted 29,101 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