X0306 4 2015-03-18 0 0001379895 DYNEGY INC. DYN 0001236545 FLEXON ROBERT C 601 TRAVIS 14TH FLOOR HOUSTON TX 77002 1 1 0 0 President and CEO Common Stock 2015-03-18 4 F 0 9081 28.84 D 248308 D These restricted stock units were withheld by Issuer to pay the taxes applicable to the vesting of 21,645 units of restricted stock on March 18, 2015. Reflects closing stock price on March 18, 2015. Amount includes 35,093 restricted stock units that vest on October 29, 2015, 21,645 restricted stock units that vest on March 18, 2016, 38,211 restricted stock units that vest in two annual equal installments beginning on March 3, 2016 and 60,261 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