X0202 4 2007-04-02 0 0001379895 DYNEGY INC. DYN 0001221456 WILLIAMSON BRUCE A 1000 LOUISIANA SUITE 5800 HOUSTON TX 77002 1 1 0 0 Chairman & CEO Class A common stock 2007-04-02 4 A 0 963451 A 963451 D Class A common stock 2007-04-02 4 A 0 10217 A 10217 I By 401(k) Plan Class A common stock 2007-04-02 4 A 0 165461 0 A 1128912 D Class A common stock 2007-04-02 4 F 0 131941 9.67 D 996971 D Employee Stock Option (Right to Buy) 4.88 2007-04-02 4 A 0 1887248 A 2007-04-02 2016-03-16 Class A common stock 1887248 1887248 D Employee Stock Option (Right to Buy) 9.67 2007-04-02 4 A 0 651732 0 A 2017-04-02 Class A common stock 651732 651732 D On April 2, 2007, Dynegy Inc., expected to be renamed Dynegy Illinois Inc. (the ?Predecessor?), merged into a wholly owned subsidiary (the ?Merger?) of Dynegy Acquisition, Inc., now known as Dynegy Inc. (the ?Issuer?). In connection with the Merger, each share of Predecessor common stock was converted into the right to receive one share of Issuer common stock. Rounded. Reflects shares held for the Reporting Person?s account by the Trustee of the Dynegy Inc. 401(k) Savings Plan as of April 2, 2007. The grants of the options and restricted stock were approved by a committee of the Issuer?s board of directors on April 2, 2007. Restricted stock grant pursuant to Rule 16b-3(d). The stock vests in full on April 2, 2010. These shares were withheld by the Issuer to pay the taxes applicable to the vesting of 360,261 shares of restricted stock on April 2, 2007 in connection with the Merger. Each Predecessor stock option was converted into one Issuer stock option, with the same terms and conditions applicable to the Predecessor stock option, at the effective time of the Merger. Option grant pursuant to Rule 16b-3(d). The option becomes exercisable in three equal annual installments beginning April 2, 2008. /s/ Heidi D. Lewis, Attorney-in-Fact 2007-04-04