X0303 4 2010-03-03 0 0001379895 DYNEGY INC. DYN 0001422588 Cook Charles C 1000 LOUISIANA SUITE 5800 HOUSTON TX 77002 0 1 0 0 Executive Vice President Class A Common 2010-03-03 4 A 0 105730 0 A 153359 D Class A Common 11008 I By 401(K) Plan Employee Stock Option (Right to Buy) 1.44 2010-03-03 4 A 0 179118 0 A 2020-03-03 Class A Common Stock 179118 179118 D The grants of the restricted stock were approved by a committee of the Issuer?s board of directors on March 3, 2010. Restricted stock grant pursuant to Rule 16b-3(d). The stock vests in full on March 3, 2013. Includes 9,514 shares of Restricted Class A common stock which vest in full on April 2, 2010 and 28,577 shares of Restricted Class A common stock which vest in full on March 6, 2011 and and 105,730 shares of Restricted Class A common stock which vest in full on March 3, 2013. Rounded. Reflects shares held for the reporting person's account by the Trustee of the Dynegy Inc. 401(k) Savings Plan as of March 3, 2010. Due to a typographical error on Mr. Cook's Form 4 filed with the Securities and Exchange Commission on March 6, 2009, it was incorrectly reported that Mr. Cook indirectly held 318,182 shares of Dynegy's common stock in his 401(k). At the time, Mr. Cook indirectly owned 4,669 shares; he now indirectly owns 11,008 shares, as reported above. The grants of the options were approved by a committee of the Issuer's board of directors on March 3, 2010. Option grant pursuant to Rule 16b-3(d). The option becomes exercisable in three equal annual installments beginning March 3, 2011. /s/ Heidi D. Lewis, Attorney-in-Fact 2010-03-05