X0306 4 2013-04-02 0 0001379895 DYNEGY INC. DYN 0001552646 Alonso Mario E 601 TRAVIS 14TH FLOOR HOUSTON TX 77002 0 1 0 0 VP-Strategic Planning & Dev Common Stock 2013-04-02 4 M 0 3497 A 12466 D Common Stock 2013-04-02 4 D 0 3497 24.32 D 8969 D Phantom Stock 2013-04-02 4 M 0 3497 D Common Stock 3497 6993 D Amount includes 4071 restricted stock units that vest in three equal annual installments beginning October 31, 2013 and 4,871 restricted stock units that vest in three annual equal installments beginning on March 18, 2014. 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, 2013. On April 2, 2013, 3,497 phantom stock units vested and were settled in cash based upon the closing stock price of $24.32 on April 2, 2013. 3,497 units of phantom stock vest on April 2, 2014 and 3,496 units vest on April 2, 2015. /s/ Heidi D. Lewis, Attorney-in-Fact 2013-04-04