X0304 4 2011-10-04 0 0000813779 CRIMSON EXPLORATION INC. CXPO 0001507061 Ni Zhaoxing CHRYSLER BUILDING 405 LEXINGTON AVE., 65TH FLOOR NEW YORK NY 10174 1 0 0 0 Common Stock 2011-10-04 4 P 0 13300 2.1006 A 6535805 I By Petro Energy Worldwide Investment Ltd. Common Stock 2011-10-05 4 P 0 6700 2.3632 A 6542505 I By Petro Energy Worldwide Investment Ltd. Common Stock 2011-10-06 4 P 0 5700 2.6239 A 6548205 I By Petro Energy Worldwide Investment Ltd. Purchase made pursuant to a Rule 10b5-1 Trading Plan. This Form 4 has been signed by John A. Thomas on behalf of Reporting Person, pursuant to an instrument of Power of Attorney, dated July 25, 2011. The authority granted pursuant to such instrument is to remain in effect until rescinded in writing by Reporting Person. John A. Thomas 2011-10-06