X0306 4 2015-03-03 0 0001379895 DYNEGY INC. DYN 0001573115 Jones Henry D. 601 TRAVIS STREET SUITE 1400 HOUSTON TX 77002 0 1 0 0 EVP & Chief Commercial Officer Common Stock 2015-03-03 4 A 0 11564 0 A 66907 D Common Stock 2015-03-03 4 F 0 1287 27.24 D 65620 D Employee Stock Option (Right to Buy) 27.24 2015-03-03 4 A 0 28590 0 A 2025-03-03 Common Stock 28590 28590 D The grants of the restricted stock units were approved by a committee of the Issuer's Board of Directors on March 3, 2015. Restricted stock unit grant pursuant to Rule 16b-3(d). Each restricted stock unit represents a contingent right to receive one share of Dynegy Inc. common stock. The restricted stock units vest in three annual equal installments beginning on March 3, 2016. These restricted stock units were withheld by Issuer to pay the taxes applicable to the vesting of 4,632 units of restricted stock on March 3, 2015. Reflects closing stock price on March 3, 2015. Amount includes 30,404 restricted stock units that vest in two annual equal installments beginning on April 1, 2015, 9,263 restricted stock units that vest in two annual equal installments beginning on March 3, 2016 and 11,564 restricted stock units that vest in three annual equal installments beginning on March 3, 2016. The grants of the stock options were approved by a committee of the Issuer's Board of Directors on March 3, 2015. Option grant pursuant to rule 16b-3(d). The option becomes exercisable in three annual equal installments beginning March 3, 2016. /s/ Heidi D. Lewis, Attorney-in-Fact 2015-03-05