X0306 4 2015-03-18 0 0001379895 DYNEGY INC. DYN 0001543686 Walden John Clinton 601 TRAVIS STREET SUITE 1400 HOUSTON TX 77002 0 1 0 0 VP and Chief Acct Officer Common Stock 2015-03-18 4 F 0 412 28.84 D 11193 D These restricted stock units were withheld by Issuer to pay the taxes applicable to the vesting of 1,506 units of restricted stock on March 18, 2015. Reflects closing stock price on March 18, 2015. Amount includes 613 restricted stock units that vest on October 29, 2015, 1,506 restricted stock units that vest on March 18, 2016, 2,316 restricted stock units that vest in two annual equal installments beginning on March 3, 2016 and 2,891 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