Prospectus Supplement No. 3 Filed pursuant to Rule 424(b)(3) (To Prospectus dated August 9, 2005) Registration No. 333-116048 P R O S P E C T U S SUPPLEMENT No. 3 CRIMSON EXPLORATION INC. 18,861,799 Shares of Crimson Exploration Inc. Common Stock (the "Shares") This document supplements the prospectus of Crimson Exploration Inc., dated August 9, 2005, as supplemented by the prospectus supplement dated August 16, 2005 and the prospectus supplement dated November 14, 2005, relating to the resale of up to 18,861,799 Shares issuable to certain selling shareholders assuming the exercise of warrants or conversion of certain preferred stock by those shareholders. The information in this prospectus supplement replaces and supersedes the information set forth under "Selling Shareholders" in the prospectus dated August 9, 2005. The table in that section has been modified to reflect the transfer of 175,000 Shares from a named selling shareholder originally included in the prospectus, Petro Capital Advisors, to one donee, St Marks School of Texas, pursuant to the prospectus as supplemented. This prospectus supplement is incorporated by reference into, and should be read in conjunction with, the prospectus supplement dated November 14, 2005, the prospectus supplement dated August 16, 2005 and the prospectus dated August 9, 2005. This prospectus supplement is not complete without, and may not be delivered or utilized except in connection with, the prospectus supplement dated November 14, 2005, the prospectus supplement dated August 16, 2005 and the prospectus dated August 9, 2005. ---------------- Investing in our stock involves a high degree of risk. Please see "Risk Factors" beginning on page 9 of the prospectus, dated August 9, 2005, for a discussion of certain factors that you should consider before investing. ---------------- Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense. The date of this prospectus supplement is December 9, 2005 SELLING SHAREHOLDERS The selling shareholders may offer and sell, from time to time, any or all of the Shares. Because the selling shareholders may offer all or only some portion of the 18,861,799 Shares, no estimate can be given as to the amount or percentage of these Shares that will be held by the selling shareholders upon termination of the offering. There will be no proceeds to us from the sale of shares of common stock in this offering. However, we will receive proceeds from the sale of shares of common stock upon the exercise of any warrants. Any proceeds received upon exercise of warrants will be used for general working capital purposes. The following table sets forth the name and relationship with us, if any, of certain of the selling shareholders and (i) the maximum number of shares of common stock which may be offered for the account of the selling shareholders under this prospectus, (ii) the amount and percentage of common stock that would be owned by the selling shareholders after completion of the offering, assuming a sale of all of the common stock which may be offered hereunder and (iii) the number of shares of common stock beneficially owned by the selling shareholders as of the date of this prospectus. Except as otherwise noted below, the selling shareholders have not, within the past three years, had any position, office or other material relationship with us. Beneficial ownership is determined under the rules of the Securities and Exchange Commission. The number of shares beneficially owned by a person includes shares of common stock subject to options, warrants and preferred stock held by that person that are currently convertible or exercisable or convertible or exercisable within 60 days of the date of this prospectus. The shares issuable under these securities are treated as if outstanding for computing the percentage ownership of the person holding these securities but are not treated as if outstanding for the purposes of computing the percentage ownership of any other person. ------------------------------------------------------------------------------------------ Amount and Name and Address of Total Shares % of Total Shares Selling Security Holder Registered Ownership Owned(1) ------------------------------------------------------------------------------------------ Drawbridge Special Opportunities Fund, L.P (2) 1,009,112 14,550 1,023,662 1251 Avenue of the Americas 16th Floor * New York, NY 10020 ------------------------------------------------------------------------------------------ D.B. Zwirn Special Opportunities Fund, L.P. (2) 1,009,112 14,550 1,023,662 745 5th Avenue 18th Floor * New York, NY 10151 ------------------------------------------------------------------------------------------ Petro Capital Advisors(3) 1,383,572 75,000 1,458,572 3838 Oak Lawn Ave., Suite 1775 Dallas, TX 75201 * ------------------------------------------------------------------------------------------ Virgil Waggoner(4) 7,160,715 9,705,503 16,866,218 6605 Cypresswood Drive, Suite 250 Spring, TX 77379 25.5% ------------------------------------------------------------------------------------------ Patrick Parker 857,143 45,000 902,143 Scarbrough Building, 6th and Congress, 101 W. 6th St. Suite 610 * Austin, TX 78701 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ Amount and Name and Address of Total Shares % of Total Shares Selling Security Holder Registered Ownership Owned(1) ------------------------------------------------------------------------------------------ Douglas Moreland 1,428,572 78,333 1,506,905 1655 East Layton Drive Englewood, CO 80100 * ------------------------------------------------------------------------------------------ Stanley Chason 71,428 0 71,428 6711 North Ocean Blvd. Ocean Ridge, FL 33435 * ------------------------------------------------------------------------------------------ XMen, LLC 1,714,286 90,000 1,804,286 520 Lake Cook Road, Suite105 Deerfield, IL 60015 * ------------------------------------------------------------------------------------------ Bruce Goldstein 77,143 3,000 80,143 1934 Deercrest Lane Northbrook, IL 60062 * ------------------------------------------------------------------------------------------ Barry S. Cohn Revocable Trust 214,286 11,250 225,536 2505 Astor Court Glenview, IL 60025 * ------------------------------------------------------------------------------------------ Bargus Partnership 142,862 7,500 150,362 (Gus Schultes) 664 South Evergreen Ave * Woodbury Heights, NJ 08097 ------------------------------------------------------------------------------------------ Schultes Family Partnership LP 142,858 7,500 150,358 (Ed Schultes) 664 South Evergreen Ave * Woodbury Heights, NJ 08097 ------------------------------------------------------------------------------------------ Richard Schultes 142,858 7,500 150,358 664 South Evergreen Ave Woodbury Heights, NJ 08097 * ------------------------------------------------------------------------------------------ 4-Sibs, LLC 142,858 7,500 150,358 664 South Evergreen Ave Woodbury Heights, NJ 08097 * ------------------------------------------------------------------------------------------ William Jefferys 28,570 1,500 30,070 664 South Evergreen Ave Woodbury Heights, NJ 08097 * ------------------------------------------------------------------------------------------ John T. O'Brien and Linda O'Brian 28,570 1,500 30,070 (JTWROS) 664 South Evergreen Ave * Woodbury Heights, NJ 08097 ------------------------------------------------------------------------------------------ Robert Collison 28,570 1,500 30,070 664 South Evergreen Ave Woodbury Heights, NJ 08097 * ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ Amount and Name and Address of Total Shares % of Total Shares Selling Security Holder Registered Ownership Owned(1) ------------------------------------------------------------------------------------------ David Hartman 28,570 1,500 30,070 664 South Evergreen Ave Woodbury Heights, NJ 08097 * ------------------------------------------------------------------------------------------ Jeffrey DeMatte 28,570 1,500 30,070 664 South Evergreen Ave Woodbury Heights, NJ 08097 * ------------------------------------------------------------------------------------------ Edwin J. Hagerty 371,429 19,500 390,929 13355 Noel Road, Suite 1400 Dallas, TX 75248 * ------------------------------------------------------------------------------------------ Star-Tex Trading Company 285,715 84,667 370,382 16300 Addison Rd., Suite 300 Addison, TX 75001 * ------------------------------------------------------------------------------------------ ST Advisory Corp./John E. Loehr(5) 470,000 147,491 617,491 16300 Addison Rd., Suite 300 Addison, TX 75001 * ------------------------------------------------------------------------------------------ Thomas R, Kaetzer(6) 200,000 408,852 608,852 480 N. Sam Houston Parkway, Suite 300 Houston, TX 77060 1.1% ------------------------------------------------------------------------------------------ Jim C. Bigham(7) 100,000 160,985 260,985 480 N. Sam Houston Parkway, Suite 300 Houston, TX 77060 * ------------------------------------------------------------------------------------------ Marshall A. Smith III(8) 270,000 619,005 889,005 480 N. Sam Houston Parkway, Suite 300 Houston, TX 77060 1.6% ------------------------------------------------------------------------------------------ Intermarket Management LLC(9) 500,000 0 500,000 271 Grove Ave., Suite C-3 Verona, NJ 07044 * ------------------------------------------------------------------------------------------ Star Investments , LTD 50,000 39,500 89,500 3421 Causeway Blvd., Suite 103 Metairie, LA 70002 * ------------------------------------------------------------------------------------------ Ray B. Nesbitt 150,000 243,333 393,333 1 Winston Woods Houston, TX 77024 * ------------------------------------------------------------------------------------------ J. T. Thompson 40,000 10,000 50,000 1212 Woodhollow Drive, No. 15101 Houston, TX 77057 * ------------------------------------------------------------------------------------------ Ron Zimmerman 60,000 0 60,000 1212 Woodhollow Drive, No. 15101 Houston, TX 77057 * ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ Amount and Name and Address of Total Shares % of Total Shares Selling Security Holder Registered Ownership Owned(1) ------------------------------------------------------------------------------------------ Steven M. Morris 500,000 0 500,000 P.O. Box 941828 Houston, TX 77094 * ------------------------------------------------------------------------------------------ John Kruljac 20,000 0 20,000 8873 E. Bayou Gulch Road Parker, CO 80134 * ------------------------------------------------------------------------------------------ USGT Investors 30,000 0 30,000 1845 Woodall Rodgers, Suite 1700 Dallas, TX 75201 * ------------------------------------------------------------------------------------------ St Marks School of Texas 175,000 0 175,000 10600 Preston Road Dallas, TX 75230 * ------------------------------------------------------------------------------------------ ----------------- * Less than 1% 1 Includes shares registered hereunder. 2 The selling shareholder is a former lender. 3 The selling shareholder is a former investment advisor. 4 Mr. Waggoner is a former director of the Company. 5 Mr. Loehr is a former director and officer of the Company. Reflects 270,000 shares issuable to Mr. Loehr pursuant to immediately exercisable warrants and 200,000 shares issued upon exchange of preferred stock held by ST Advisory Corp. ST Advisory Corp. is owned by John E. Loehr. 6 Mr. Kaetzer is Senior Vice President of Operations of the Company. See "Management." 7 Mr. Bigham is Vice President and Secretary of the Company. See "Management." 8 Mr. Smith was a director of the Company. 9 Mr. M. Scott Manolis was one of our directors. Mr. Manolis is an owner of Intermarket Management LLC.