X0306 4 2015-03-18 0 0001379895 DYNEGY INC. DYN 0001530677 Callaway Catherine B. 601 TRAVIS 14TH FLOOR HOUSTON TX 77002 0 1 0 0 Exec VP and General Counsel Common Stock 2015-03-18 4 F 0 1579 28.84 D 60542 D These restricted stock units were withheld by Issuer to pay the taxes applicable to the vesting of 5,772 units of restricted stock on March 18, 2015. Reflects closing stock price on March 18, 2015. Amount includes 9,024 restricted stock units that vest on October 29, 2015, 5,772 restricted stock units that vest on March 18, 2016, 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. /s/ Heidi D. Lewis, Attorney-in-Fact 2015-03-20