X0306 4 2017-03-03 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 2017-03-03 4 F 0 10720 8.29 D 647072 D These restricted stock units were withheld by Issuer to pay the taxes applicable to the vesting of 39,192 units of restricted stock on March 3, 2017. Reflects the closing stock price on March 3, 2017. Amount includes 20,087 restricted stock units that vest on March 3, 2018, 153,563 restricted stock units that vest on April 30, 2018 and 228,330 restricted stock units that vest in three annual equal installments beginning on March 1, 2018. /s/ Heidi D. Lewis, Attorney-in-Fact 2017-03-07