X0306 4 2015-04-02 0 0001379895 DYNEGY INC. DYN 0001543686 Walden John Clinton 601 TRAVIS STREET SUITE 1400 HOUSTON TX 77002 0 1 0 0 VP and Chief Accounting Office Common Stock 2015-04-02 4 M 0 3250 A 14443 D Common Stock 2015-04-02 4 D 0 3250 31.29 D 11193 D Phantom Stock 2015-04-02 4 M 0 3250 A Common Stock 3250 0 D Amount includes 613 restricted stock units that vest on October 29, 2015, 1,506 restricted stock units that vest on March 18, 2016, 2,316 restricted stock units that vest in two annual equal installments beginning on March 3, 2016 and 2,891 restricted stock units that vest in three annual equal installments beginning on March 3, 2016. Each unit of phantom stock is the economic equivalent of one share of common stock. The units of phantom stock become payable in cash within 30 days after the vesting date, April 2, 2015. On April 2, 2015, 3,250 phantom stock units vested and were settled in cash based upon the closing stock price of $31.29 on April 2, 2015. /s/ Heidi D. Lewis, Attorney-in-Fact 2015-04-03