UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 10-KSB/A (Amendment No. 2) [X] ANNUAL REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2004 [_] TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _____________ to _____________ Commission file number 1-31398 NATURAL GAS SERVICES GROUP, INC. (Name of small business issuer in its charter) Colorado 75-2811855 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 2911 South County Road 1260 Midland, Texas 79706 (Address of principal executive offices) (Zip Code) (432) 563-3974 (Issuer's telephone number, including area code) Securities registered under Section 12(b) of the Exchange Act: Common Stock $.01 Par Value (Title of Class) Warrants to Purchase Common Stock (Title of Class) Securities registered under Section 12(g) of the Exchange Act: None Check whether the issuer (1) filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the past 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes X No --- --- Check if there is no disclosure of delinquent filers in response to Item 405 of Regulation S-B contained in this form, and no disclosure will be contained, to the best of the registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-KSB or any amendment to this Form 10-KSB. [X] State issuer's revenue for its most recent fiscal year: $15,958,199 The aggregate market value of the voting and non-voting common equity held by non-affiliates at March 23, 2005, computed by reference to the closing price of $10.76 per share on the American Stock Exchange, was $47,676,914. The number of shares outstanding of each of the issuer's classes of common equity on March 23, 2005, was 6,765,764. Documents Incorporated by Reference None Transitional Small Business Disclosure Format Yes No X --- --- ================================================================================ EXPLANATORY NOTE We are filing this Amendment No. 2 to our Annual Report on Form 10-KSB in response to comments received by us from the Staff of the Securities and Exchange Commission. Unless otherwise stated, all information contained in this amendment is as of March 30, 2005, the filing date of our original Annual Report on Form 10-KSB for the fiscal year ended December 31, 2004. As a result of this amendment, Natural Gas Services Group, Inc. is filing as exhibits to this Amendment No. 2 on Form 10-KSB the certifications pursuant to Section 302 and 906 of the Sarbanes-Oxley Act of 2002. This Amendment No. 2 on Form 10-KSB/A does not change our previously reported financial statements and other financial disclosures. Items included in the original Form 10-KSB, as amended by Amendment No. 1 to Form 10-KSB filed with the Securities and Exchange Commission on May 4, 2005, that are not included herein are not amended and remain in effect as of the date of the original filing, as amended by Amendment No. 1. Additionally, this Form 10-KSB/A does not purport to provide an update or a discussion of any other developments subsequent to the original filing, as amended by Amendment No. 1. 2 Item 8A. CONTROLS AND PROCEDURES Under the supervision and with the participation of certain members of Natural Gas' management, the chief executive officer and the chief financial officer evaluated the effectiveness of the disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended (the "Exchange Act")) of Natural Gas Services Group, Inc. as of December 31, 2004. Based on this evaluation, the chief executive officer and chief financial officer concluded that Natural Gas' disclosure controls and procedures were effective as of the end of the period covered by this report to ensure that information required to be disclosed by Natural Gas Services Group, Inc. in the reports that it files under the Exchange Act is collected, processed and disclosed within the time periods specified in the Commission's rules and forms. There were no changes in Natural Gas' internal controls during the fourth quarter of 2004 that have materially affected or are reasonably likely to materially affect Natural Gas' internal controls over financial reporting. In addition, to the knowledge of the chief executive officer and chief financial officer there were no changes in other factors that could significantly affect these controls subsequent to the date of the most recent evaluation made by the chief executive officer and chief financial officer. 3 Item 13. EXHIBITS The following is a list of all exhibits filed as part of this Form 10-KSB/A: Exhibit No. Description ----------- ----------- 2.1 Purchase and Sale Agreement by and between Hy-Bon Engineering Company, Inc. and NGE Leasing, Inc. (Incorporated by reference to Exhibit 2.1 of the Registrant's Current Report on Form 8-K dated February 28, 2003 and filed with the Securities and Exchange Commission on March 6, 2003) 3.1 Articles of Incorporation, as amended (Incorporated by reference to Exhibit 3.1 of the 10QSB filed and dated November 10, 2004) 3.2 Bylaws (Incorporated by reference to Exhibit 3.4 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.1 Form of warrant certificate (Incorporated by reference to Exhibit 4.1 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.2 Form of warrant agent agreement (Incorporated by reference to Exhibit 4.2 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.3 Form of lock-up agreement (Incorporated by reference to Exhibit 4.3 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.4 Form of representative's option for the purchase of common stock (Incorporated by reference to Exhibit 4.4 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.5 Form of representative's option for the purchase of warrants (Incorporated by reference to Exhibit 4.5 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.6 Stockholders Agreement, dated January 3, 2005 among Paul D. Hensley, Tony Vohjesus, Jim Hazlett and Natural Gas Services Group, Inc. (Incorporated by reference to Exhibit 4.3 of the Registrant's From 8-K Report, dated January 3, 2005, as filed with the Securities and Exchange Commission on January 7, 2005) 4 Executive Compensation Plans and Arrangements (Exhibits 10.1, 10.24, 10.25 and 10.26) 10.1 1998 Stock Option Plan (Incorporated by reference to Exhibit 10.1 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.2 Asset Purchase Agreement, dated January 1, 2001, between the Registrant and Great Lakes Compression, Inc. (Incorporated by reference to Exhibit 10.2 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.3 Exhibits 3(c)(1), 3(c)(2), 3(c)(3), 3(c)(4), 13(d)(1), 13(d)(2) and 13(d)(3) to Asset Purchase Agreement, dated January 1, 2001, between the Registrant and Great Lakes Compression, Inc. (Incorporated by reference to Exhibit 10.14 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.4 Amendment to Guaranty Agreement between Natural Gas Services Group, Inc. and Dominion Michigan Production Services, Inc. (Incorporated by reference to Exhibit 10.3 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.5 Form of Series A 10% Subordinated Notes due December 31, 2006 (Incorporated by reference to Exhibit 10.8 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.6 Form of Five-Year Warrants to Purchase Common Stock (Incorporated by reference to Exhibit 10.9 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.7 Warrants issued to Berry-Shino Securities, Inc. (Incorporated by reference to Exhibit 10.10 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.8 Warrants issued to Neidiger, Tucker, Bruner, Inc. (Incorporated by reference to Exhibit 10.11 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.9 Form of warrant issued in March 2001 for guaranteeing debt (Incorporated by reference to Exhibit 10.12 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.10 Form of warrant issued in April 2002 for guaranteeing debt (Incorporated by reference to Exhibit 10.13 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 5 10.11 Articles of Organization of Hy-Bon Rotary Compression, L.L.C., dated April 17, 2000 (Incorporated by reference to Exhibit 10.18 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.12 Regulations of Hy-Bon Rotary Compression, L.L.C. (Incorporated by reference to Exhibit 10.19 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.13 First Amended and Restated Loan Agreement between the Registrant and Western National Bank (Incorporated by reference to Exhibit 10.1 of the Registrant's Current Report on Form 8-K, dated March 27, 2003 and filed with the Securities and Exchange Commission on April 14, 2003) 10.14 Form of Termination of Employment Agreement Letter relating to the Employment Agreement of Alan Kurus (Incorporated by reference to Exhibit 10.25 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2002) 10.15 Form of Termination of Employment Agreement Letter relating to the Employment Agreement of Wayne Vinson (Incorporated by reference to Exhibit 10.26 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2002) 10.16 Form of Termination of Employment Agreement Letter relating to the Employment Agreement of Earl Wait (Incorporated by reference to Exhibit 10.27 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2002) 10.17 Triple Net Lease Agreement, dated June 1, 2003, between NGE Leasing, Inc. and Steven J. & Katherina L. Winer (Incorporated by reference to Exhibit 10.17 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2003) 10.18 Lease Agreement, dated June 19, 2003, between NGE Leasing, Inc. and Wise Commercial Properties (Incorporated by reference to Exhibit 10.18 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2003) 10.19 Lease Agreement, dated March 1, 2004, between the Registrant and the City of Midland, Texas (Incorporated by reference to Exhibit 10.19 of the Registrant's Form 10-QSB for the fiscal quarter ended June 30, 2004) 6 10.20 Second Amended and Restated Loan Agreement, dated November 3, 2003, between the Registrant and Western National Bank (Incorporated by reference to Exhibit 10.20 of the Registrant's Form 10-QSB for the fiscal quarter ended June 30, 2004) 10.21 Securities Purchase Agreement, dated July 20, 2004, between the Registrant and CBarney Investments, Ltd. (Incorporated by reference to Exhibit 4.1 of the Registrant's Current Report on Form 8-K dated July 20, 2004 and filed with the Securities and Exchange Commission on July 27, 2004) 10.22 Stock Purchase Agreement, dated October 18, 2004, by and among the Registrant, Screw Compression Systems, Inc., Paul D. Hensley, Jim Hazlett and Tony Vohjesus (Incorporated by reference to Exhibit 4.1 of the Registrant's Current Report on Form 8-K dated October 18, 2004 and filed with the Securities and Exchange Commission on October 21, 2004) 10.23 Fourth Amended and Restated Loan Agreement (Incorporated by reference to Exhibit 10.1 of the Registrant's Current Report on Form 8-K, dated March 14, 2005 as filed with the Securities and Exchange Commission on March 18, 2005) 10.24 Employment Agreement between Paul D. Hensley and Natural Gas Services Group, Inc. (Incorporated by reference to Exhibit 10.1 of the Registrants Form 8-K Report, dated January 3, 2005, as filed with the Securities and Exchange Commission on January 7, 2005) 10.25 Employment Agreement between William R. Larkin and Natural Gas Services Group, Inc. (Incorporated by reference to Exhibit 10.25 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) 10.26 Promissory Note, dated January 3, 2005, in the original principal amount of $2,100,000.00 made by Natural Gas Services Group, Inc. payable to Paul D. Hensley (Incorporated by reference to Exhibit 10.26 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) 14.0 Code of Ethics (Incorporated by reference to Exhibit 14.0 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) 7 21.0 Subsidiaries (Incorporated by reference to Exhibit 21.0 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) 23.1 Consent of Hein & Associates LLP (Incorporated by reference to Exhibit 23.1 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) *31.1 Certification of Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002 *31.2 Certification of Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002 *32.1 Certification required by Section 906 of the Sarbanes-Oxley Act of 2002 *32.2 Certification required by Section 906 of the Sarbanes-Oxley Act of 2002 ----------------------------- * Filed herewith. 8 SIGNATURES In accordance with Section 13 or 15(d) of the Exchange Act, the registrant caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Date: July 6, 2005 NATURAL GAS SERVICES GROUP, INC. By: /s/ Stephen C. Taylor -------------------------------- Stephen C. Taylor, President and Principal Executive Officer By: /s/ Earl R.Wait -------------------------------- Earl R. Wait, Chief Financial Officer 9 EXHIBIT INDEX The following is a list of all exhibits filed as part of this Form 10-KSB/A: Exhibit No. Description ----------- ----------- 2.1 Purchase and Sale Agreement by and between Hy-Bon Engineering Company, Inc. and NGE Leasing, Inc. (Incorporated by reference to Exhibit 2.1 of the Registrant's Current Report on Form 8-K dated February 28, 2003 and filed with the Securities and Exchange Commission on March 6, 2003) 3.1 Articles of Incorporation, as amended (Incorporated by reference to Exhibit 3.1 of the 10QSB filed and dated November 10, 2004) 3.2 Bylaws (Incorporated by reference to Exhibit 3.4 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.1 Form of warrant certificate (Incorporated by reference to Exhibit 4.1 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.2 Form of warrant agent agreement (Incorporated by reference to Exhibit 4.2 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.3 Form of lock-up agreement (Incorporated by reference to Exhibit 4.3 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.4 Form of representative's option for the purchase of common stock (Incorporated by reference to Exhibit 4.4 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.5 Form of representative's option for the purchase of warrants (Incorporated by reference to Exhibit 4.5 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 4.6 Stockholders Agreement, dated January 3, 2005 among Paul D. Hensley, Tony Vohjesus, Jim Hazlett and Natural Gas Services Group, Inc. (Incorporated by reference to Exhibit 4.3 of the Registrant's From 8-K Report, dated January 3, 2005, as filed with the Securities and Exchange Commission on January 7, 2005) Executive Compensation Plans and Arrangements (Exhibits 10.1, 10.24, 10.25 and 10.26) 10.1 1998 Stock Option Plan (Incorporated by reference to Exhibit 10.1 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.2 Asset Purchase Agreement, dated January 1, 2001, between the Registrant and Great Lakes Compression, Inc. (Incorporated by reference to Exhibit 10.2 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.3 Exhibits 3(c)(1), 3(c)(2), 3(c)(3), 3(c)(4), 13(d)(1), 13(d)(2) and 13(d)(3) to Asset Purchase Agreement, dated January 1, 2001, between the Registrant and Great Lakes Compression, Inc. (Incorporated by reference to Exhibit 10.14 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.4 Amendment to Guaranty Agreement between Natural Gas Services Group, Inc. and Dominion Michigan Production Services, Inc. (Incorporated by reference to Exhibit 10.3 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.5 Form of Series A 10% Subordinated Notes due December 31, 2006 (Incorporated by reference to Exhibit 10.8 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.6 Form of Five-Year Warrants to Purchase Common Stock (Incorporated by reference to Exhibit 10.9 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.7 Warrants issued to Berry-Shino Securities, Inc. (Incorporated by reference to Exhibit 10.10 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.8 Warrants issued to Neidiger, Tucker, Bruner, Inc. (Incorporated by reference to Exhibit 10.11 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.9 Form of warrant issued in March 2001 for guaranteeing debt (Incorporated by reference to Exhibit 10.12 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.10 Form of warrant issued in April 2002 for guaranteeing debt (Incorporated by reference to Exhibit 10.13 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.11 Articles of Organization of Hy-Bon Rotary Compression, L.L.C., dated April 17, 2000 (Incorporated by reference to Exhibit 10.18 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.12 Regulations of Hy-Bon Rotary Compression, L.L.C. (Incorporated by reference to Exhibit 10.19 of the Registrant's Registration Statement on Form SB-2, No. 333-88314) 10.13 First Amended and Restated Loan Agreement between the Registrant and Western National Bank (Incorporated by reference to Exhibit 10.1 of the Registrant's Current Report on Form 8-K, dated March 27, 2003 and filed with the Securities and Exchange Commission on April 14, 2003) 10.14 Form of Termination of Employment Agreement Letter relating to the Employment Agreement of Alan Kurus (Incorporated by reference to Exhibit 10.25 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2002) 10.15 Form of Termination of Employment Agreement Letter relating to the Employment Agreement of Wayne Vinson (Incorporated by reference to Exhibit 10.26 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2002) 10.16 Form of Termination of Employment Agreement Letter relating to the Employment Agreement of Earl Wait (Incorporated by reference to Exhibit 10.27 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2002) 10.17 Triple Net Lease Agreement, dated June 1, 2003, between NGE Leasing, Inc. and Steven J. & Katherina L. Winer (Incorporated by reference to Exhibit 10.17 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2003) 10.18 Lease Agreement, dated June 19, 2003, between NGE Leasing, Inc. and Wise Commercial Properties (Incorporated by reference to Exhibit 10.18 of the Registrant's Annual Report on Form 10-KSB for the fiscal year ended December 31, 2003) 10.19 Lease Agreement, dated March 1, 2004, between the Registrant and the City of Midland, Texas (Incorporated by reference to Exhibit 10.19 of the Registrant's Form 10-QSB for the fiscal quarter ended June 30, 2004) 10.20 Second Amended and Restated Loan Agreement, dated November 3, 2003, between the Registrant and Western National Bank (Incorporated by reference to Exhibit 10.20 of the Registrant's Form 10-QSB for the fiscal quarter ended June 30, 2004) 10.21 Securities Purchase Agreement, dated July 20, 2004, between the Registrant and CBarney Investments, Ltd. (Incorporated by reference to Exhibit 4.1 of the Registrant's Current Report on Form 8-K dated July 20, 2004 and filed with the Securities and Exchange Commission on July 27, 2004) 10.22 Stock Purchase Agreement, dated October 18, 2004, by and among the Registrant, Screw Compression Systems, Inc., Paul D. Hensley, Jim Hazlett and Tony Vohjesus (Incorporated by reference to Exhibit 4.1 of the Registrant's Current Report on Form 8-K dated October 18, 2004 and filed with the Securities and Exchange Commission on October 21, 2004) 10.23 Fourth Amended and Restated Loan Agreement (Incorporated by reference to Exhibit 10.1 of the Registrant's Current Report on Form 8-K, dated March 14, 2005 as filed with the Securities and Exchange Commission on March 18, 2005) 10.24 Employment Agreement between Paul D. Hensley and Natural Gas Services Group, Inc. (Incorporated by reference to Exhibit 10.1 of the Registrants Form 8-K Report, dated January 3, 2005, as filed with the Securities and Exchange Commission on January 7, 2005) 10.25 Employment Agreement between William R. Larkin and Natural Gas Services Group, Inc. (Incorporated by reference to Exhibit 10.25 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) 10.26 Promissory Note, dated January 3, 2005, in the original principal amount of $2,100,000.00 made by Natural Gas Services Group, Inc. payable to Paul D. Hensley (Incorporated by reference to Exhibit 10.26 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) 14.0 Code of Ethics (Incorporated by reference to Exhibit 14.0 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) 21.0 Subsidiaries (Incorporated by reference to Exhibit 21.0 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) 23.1 Consent of Hein & Associates LLP (Incorporated by reference to Exhibit 23.1 of the Registrant's Form 10-KSB for the fiscal year ended December 31, 2004, and filed with the Securities and Exchange Commission on March 30, 2005) *31.1 Certification of Chief Executive Officer required by Section 302 of the Sarbanes-Oxley Act of 2002 *31.2 Certification of Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act of 2002 *32.1 Certification required by Section 906 of the Sarbanes-Oxley Act of 2002 *32.2 Certification required by Section 906 of the Sarbanes-Oxley Act of 2002 ----------------------------- * Filed herewith.