UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended: September 30, 2001 Check here if Amendment [ ]; Amendment Number: _____ This Amendment (Check only one): [ ] is a restatement. [ ] adds new holdings entries. Institutional Investment Manager Filing this Report: CMGI, Inc. 100 Brickstone Square Andover, MA 01810 Form 13F File Number: 028-05757 The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form. Person Signing this Report on Behalf of Reporting Manager: George A. McMillan Chief Financial Officer and Treasurer (978) 684-3600 Signature, Place and Date of Signing: /s/ George A. McMillan ---------------------- Andover, Massachusetts November 7, 2001 Report Type (Check only one): [X] 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.) [ ] 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).) [ ] 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other manager(s).)

Form 13F SUMMARY PAGE REPORTING MANAGER: CMGI, Inc. Report Summary: Number of Other Included Managers: 3 Form 13F Information Table Entry Total: 20 ---- Form 13F Information Table Value Total: $ 122,182 (thousands) --------- List of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. 1. CMG@Ventures, Inc. File No. 028-05751 2. CMG@Ventures Capital Corp. File No. 028-05755 3. CMG@Ventures Securities Corp. File No. 028-05763

FORM 13F INFORMATION TABLE REPORTING MANAGER: CMGI, Inc. ITEM 4: ITEM 5: FAIR SHARES ITEM 8: ITEM 2: ITEM 3: MARKET OR ITEM 6: VOTING AUTHORITY ITEM 1: TITLE OF CUSIP VALUE PRINCIPAL SH/ INVESTMENT ITEM 7: (A) (B) (C) NAME OF ISSUER CLASS NUMBER (000) AMOUNT PRN DISCRETION MANAGERS SOLE SHARED NONE CMGI, Inc. COM 125750109 262 261,642 SH DEFINED 261,642 divine, inc. COM 255404105 2,945 4,749,287 SH SOLE 4,749,287 Engage, Inc. COM 292827102 36,040 150,165,099 SH SOLE 150,165,099 GLOBALMEDIA.COM COM 37935A109 13 1,822,127 SH SOLE 1,822,127 MarchFIRST, Inc. COM 966834103 0 3,045 SH DEFINED 1 3,045 Marketing Services COM 570907105 748 2,136,061 SH SOLE 2,136,061 Group, Inc. MotherNature.com, Inc. COM 61978K105 1 12,367 SH DEFINED 1 12,367 MotherNature.com, Inc. COM 61978K105 110 1,224,307 SH DEFINED 2 1,224,307 NaviSite, Inc. COM 63935M109 8,152 42,905,685 SH SOLE 42,905,685 PRIMEDIA Inc. COM 74157K101 14,371 6,115,200 SH SOLE 6,115,200 PTEK Holdings, Inc. COM 69366M104 129 49,955 SH DEFINED 1 49,955 Techlabs, Inc. (1) COM 87833L103 192 960,307 SH DEFINED 960,307 Terra Networks, S.A. COM 15,880 3,119,767 SH DEFINED 1 3,119,767 Ventro Corporation COM 163595101 6 21,814 SH DEFINED 1 21,814 Ventro Corporation COM 163595101 858 3,177,914 SH DEFINED 2 3,177,914 Vicinity Corporation COM 925653107 473 303,569 SH DEFINED 1 303,569 Vicinity Corporation COM 925653107 7,160 4,590,058 SH DEFINED 2 4,590,058 Yahoo! Inc. COM 984332106 5,381 610,790 SH DEFINED 1 610,790 Yahoo! Inc. COM 984332106 15 1,702 SH DEFINED 2 1,702 Yahoo! Inc. COM 984332106 5,123 581,499 SH DEFINED 3 581,499 1. yesmail.com, inc., a wholly owned subsidiary of CMGI, Inc., currently holds 12,500 shares of Techlabs, Inc. Pursuant to the Agreement for the Purchase and Sale of Assets, dated December 7, 1999, an additional 947,807 shares are issuable to yesmail.com, inc., but are not yet issued. The issuance of these shares is currently in dispute.