Exhibit 4.2 AMENDMENT TO STOCKHOLDERS AGREEMENT Dated as of October 2, 2000 DDi Corp., a Delaware corporation (the "Company"), Bain Capital Fund V, L.P., Bain Capital Fund V-B, L.P., BCIP Associates, L.P., and BCIP Trust Associates, L.P., and the Other Investors and Managers signatories hereto: 1. Reference to the Stockholders Agreement; Definitions. Reference is made to the Stockholders Agreement dated as of April 14, 2000 (as amended, the "Stockholders Agreement"), among the Company and the holders of its equity interests (including without limitation the other parties hereto). Terms defined in the Stockholders Agreement and not otherwise defined herein are used herein with the meanings so defined. 2. Amendment. Pursuant to Section 12.2 of the Stockholders Agreement, each Investor and each other signatory hereto hereby agrees to amend Section 8.4.4 of the Stockholders Agreement by deleting the second sentence thereof and replacing it with the following sentence: "In the case of any Public Offering that is not the IPO or effected pursuant to Section 8.2A, each holder of Shares agrees to enter into a reasonable form of agreement, approved by the Company, restricting the Transfer of any Common Stock during the period beginning seven days immediately preceding and ending on the 90th day following the effective date of the registration statement used in connection with such offering if the underwriters managing such Public Offering demand such an agreement." 2. Miscellaneous. Except to the extent specifically amended hereby, the provisions of the Stockholders Agreement shall remain unmodified, and, subject to the conditions contained in this Amendment, the Stockholders Agreement is hereby confirmed as being in full force and effect. This Amendment may be executed in any number of counterparts which together shall constitute one instrument, shall be governed by and construed in accordance with the laws of the State of Delaware, without regard to the conflict of laws rules of any jurisdictions. Amendment to Stockholders Agreement October 2, 2000 In WITNESS WHEREOF, the parties have caused this Amendment to the Stockholders Agreement to be executed and delivered as of the date first above written. DDI CORP. By /s/ JOSEPH P. GISCH -------------------------------- Name: Title: INVESTORS: BAIN CAPITAL FUND V, L.P. BAIN CAPITAL FUND V-B, L.P. By Bain Capital Partners V, L.P., their general partner By Bain Capital Investors V, Inc., its general partner By /s/ EDWARD CONARD -------------------------------- Name: Title: Managing Director BCIP ASSOCIATES BCIP TRUST ASSOCIATES, L.P. By /s/ EDWARD CONARD -------------------------------- Name: Title: a general partner Amendment to Stockholders Agreement October 2, 2000 OTHER INVESTORS: CELERITY DYNAMO, L.L.C. By /s/ [ILLEGIBLE] -------------------------------- its Manager CELERITY LIQUIDS, L.L.C. By /s/ [ILLEGIBLE] -------------------------------- its Manager CELERITY DETAILS, L.L.C. By /s/ [ILLEGIBLE] -------------------------------- its Manager Amendment to Stockholders Agreement October 2, 2000 OTHER INVESTORS: CHASE MANHATTAN CAPITAL, L.P. By /s/ [ILLEGIBLE] -------------------------------- its CHASE SECURITIES INC. By /s/ [ILLEGIBLE] -------------------------------- its DI INVESTORS, L.L.C. By /s/ [ILLEGIBLE] -------------------------------- its Amendment to Stockholders Agreement October 2, 2000 MANAGERS: /s/ CHARLES D. DIMICK -------------------------------- Charles D. Dimick /s/ BRUCE D. MCMASTER -------------------------------- Bruce D. McMaster /s/ JOSEPH P. GISCH -------------------------------- Joseph P. Gisch