X0304 4 2011-08-18 0 0001379895 DYNEGY INC. DYN 0001345815 Lednicky Lynn A 1000 LOUISIANA SUITE 5800 HOUSTON TX 77002 0 1 0 0 Executive Vice President Common Stock 2011-08-18 4 S 0 6993 3.97 D 21446 D Common Stock 8028 I By 401(k) Plan The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on April 11, 2011. Includes 21,146 shares of Restricted 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 August 18, 2011. /s/ Heidi D. Lewis, Attorney-in-Fact 2011-08-22