UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549 FORM 8-K/A(Amendment No. 1) CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 4, 2011 Dresser-Rand Group Inc.
(Exact name of registrant as specified in its charter) Delaware
    
    001-32586
    
    20-1780492(State or other Jurisdiction of Incorporation)
    
    (Commission File Number)
    
    (IRS Employer Identification No.) 10205 Westheimer Road, Houston, Texas112 Avenue Kleber, Paris, France
    
    7704275784(Address of Principal Executive Offices)
    
    (Zip Code) Registrants telephone number, including area code: (713) 354-6100 (Houston)                                                                                           + 33 156 267171 (Paris) Not Applicable(Former name or former address if changed since last report.) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant
under any of the following provisions: o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
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Explanatory Note On May 4, 2011, Dresser-Rand Group Inc. (the Company) filed a Current Report on Form 8-K (the Original Report)
reporting that, on May 4, 2011, the Company completed, through a subsidiary, its acquisition (the Acquisition) of
Grupo Guascor S.L., a Spanish Sociedad Limitad(GG). This Form 8-K/A amends Item 9.01 of the Original Report to provide GGs audited consolidated financial statements for
the year ended December 31, 2010 and the unaudited pro forma consolidated financial information related to the
Acquisition as required by Items 9.01(a) and 9.01(b) of Form 8-K. Except for the filing of the financial information required under Item 9.01, this Form 8-K/A does not amend or update
any other information contained in the Original Report. The information previously reported in the Original Report is
hereby incorporated herein by reference. CAUTIONARY LANGUAGE CONCERNING FORWARD-LOOKING STATEMENTS Information set forth in this filing contains financial estimates and other forward-looking statements that are subject
to risks and uncertainties, and actual results may differ materially. A discussion of factors that may affect future
results is contained in the Companys filings with the Securities and Exchange Commission. The Company disclaims any
obligation to update or revise statements contained in this filing based on new information or otherwise, except as
required by applicable law. Item 9.01 Financial Statements and Exhibits. (a) Financial statements of businesses acquired. The GG audited consolidated financial statements for the year ended December 31, 2010 are attached to this Form 8-K/A
as Exhibit 99.1 and incorporated herein by reference. (b) Pro forma financial information. Unaudited pro forma consolidated financial information related to the Acquisition is attached to this Form 8-K/A as
Exhibit 99.2 and incorporated herein by reference. (d) Exhibits. Exhibit Number
    
    Description23.1
    
    Consent of PricewaterhouseCoopers.99.1
    
    Grupo Guascor S.L. Audited Consolidated Financial Statements for the Year Ended December 31, 2010 (English
translation).99.2
    
    Unaudited Pro Forma Consolidated Financial Information.
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SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this
report to be signed on its behalf by the undersigned hereunto duly authorized. DRESSER-RAND GROUP INC. Date: July 20, 2011
    By:
    /s/ Mark E. BaldwinName:
    Mark E. BaldwinTitle:
    Executive Vice President and CFO
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EXHIBIT INDEX Exhibit Number
    
    Description23.1
    
    Consent of PricewaterhouseCoopers.99.1
    
    Grupo Guascor S.L. Audited Consolidated Financial Statements for the Year Ended December 31, 2010 (English
translation).99.2
    
    Unaudited Pro Forma Consolidated Financial Information.
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