X0306 4 2015-03-18 0 0001379895 DYNEGY INC. DYN 0001620424 Cox Julius 601 TRAVIS STREET SUITE 1400 HOUSTON TX 77002 0 1 0 0 EVP - CAO Common Stock 2015-03-18 4 F 0 415 28.84 D 17368 D These restricted stock units were withheld by the issuer to pay the taxes applicable to the vesting of 1,515 units of restricted stock on March 18, 2015. Reflects the closing stock price on March 18, 2015. Amount includes 2,651 restricted stock units that vest on October 29, 2015, 1,515 restricted stock units that vest on March 18, 2016, 2,374 restricted stock units that vest in two annual equal installments beginning on March 3, 2016 and 7,003 restricted stock units that vest in three annual installments beginning on March 3, 2016. Heidi Lewis 2015-03-20