Exhibit 10.7.1 FIRST AMENDMENT TO REGISTRATION AGREEMENT This First Amendment to the Registration Agreement (this "Amendment") is entered into as of October 7, 1998, by and between The Productivity Fund III, L.P., a Delaware limited partnership (the "Productivity Fund"), Environmental Private Equity Fund II, L.P., a Delaware limited partnership (the "Environmental Private Equity Fund"), Mark Koulogeorge, Warburg, Pincus Equity Partners, L.P. ("WPEP") (all such persons listed on the Schedule of Purchasers attached hereto, and collectively referred to herein as the "Purchasers" and individually as a "Purchaser") and The Cobalt Group, Inc., a Washington corporation (the "Company"). RECITALS A. The Company, The Productivity Fund, the Environmental Private Equity Fund and Mark Koulogeorge are parties to a Registration Agreement, dated as of February 28, 1997 (the "Agreement"). B. The Company and WPEP have entered into a Purchase Agreement, of even date herewith (the "Series B Purchase Agreement"). All capitalized terms used herein and not defined shall have the meaning set forth in the Agreement. C. The Company and the Purchasers desire to amend the Agreement to induce WPEP to enter into the Series B Purchase Agreement. AGREEMENT 1. AMENDMENT TO PARAGRAPH 1(a). The first sentence of Paragraph 1(a) is hereby amended to insert October 1, 2000," in the place of "the second anniversary of the date hereof." 2. AMENDMENT TO PARAGRAPH 1(g). The first sentence of Paragraph 1(g) is hereby amended to read as follows: "'Registrable Securities' means (i) any Series A Preferred Stock issued pursuant to the Purchase Agreement, (ii) any Series B Preferred Stock issued pursuant to the Series B Purchase Agreement, (ii) any Common Stock issued upon the conversion of any Series A Preferred Stock issued pursuant to the Purchase Agreement, (iv) any Common Stock issued upon the conversion of any Series B Preferred Stock issued pursuant to the Series B Purchase Agreement, and (v) any Common Stock issued or issuable with respect to the securities referred to in clauses (i), (ii), (iii) and (iv) by way of a stock dividend or stock split or in connection with a combination of shares, recapitalization, merger, consolidation or other reorganization." The last sentence of Paragraph 1(g) is hereby amended to read as follows: "Unless otherwise stated, other capitalized terms contained herein shall have the meanings set forth in the Series B Purchase Agreement." 3. AMENDMENT TO PARAGRAPH 8(e). Paragraph 8(e) is hereby amended to insert "the Series B Purchase Agreement" in the place of "the Purchase Agreement." 4. NO OTHER AMENDMENTS. Except as expressly amended as set forth above, the Registration Agreement shall remain in full force and effect in accordance with its terms. IN WITNESS WHEREOF, the parties hereto have executed this First Amendment on the date first written above. THE COBALT GROUP, INC. By: -------------------------------------- Name: ----------------------------- Title: ---------------------------- WARBURG, PINCUS EQUITY PARTNERS, L.P. By: Warburg, Pincus & Co., Inc. Its: General Partner By: ------------------------------ Joseph P. Landy, Partner THE PRODUCTIVITY FUND III, L.P., a Delaware limited partnership By: First Analysis Management Company III, L.L.C., Its: General Partner By: ------------------------------ Its: ------------------------------ ENVIRONMENTAL PRIVATE EQUITY FUND II, L.P., a Delaware limited partnership By: Environmental Private Equity Management II, L.P. Its: General Partner By: First Analysis EPEF Management Company II, a General Partner By: First Analysis Corporation, a General Partner By: --------------------------- Mark Koulogeorge --------------------------- Mark Koulogeorge SCHEDULE OF PURCHASERS NUMBER OF SHARES OF PREFERRED STOCK NAME AND ADDRESS Warburg, Pincus Equity Partners, L.P. Series A: 788,004 466 Lexington Avenue Series B: 1,858,100 New York, NY 10017 Series B-1: 5,118,091 The Productivity Fund III, L.P. Series A: 507,580 The Sears Tower Series B: 0 Suite 9500 Series B-1: 0 233 South Wacker Drive Chicago, IL 60606 Environmental Private Equity Fund II, L.P. Series A: 697,924 The Sears Tower Series B: 0 Suite 9500 Series B-1: 0 233 South Wacker Drive Chicago, IL 60606 Mark Koulogeorge Series A: 112,774 The Sears Tower Series B: 0 Suite 9500 Series B-1: 0 233 South Wacker Drive Chicago, IL 60606