UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended: June 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 August 11, 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: 18 --- Form 13F Information Table Value Total: $294,073 (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 785 261,642 SH DEFINED 261,642 divine, inc. COM 255404105 9,974 4,749,287 SH SOLE 4,749,287 Engage, Inc. COM 292827102 110,867 151,873,081 SH SOLE 151,873,081 Marketing Services COM 570907105 1,752 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 135 1,224,307 SH DEFINED 2 1,224,307 NaviSite, Inc. COM 63935M109 59,561 41,076,610 SH SOLE 41,076,610 PRIMEDIA Inc. COM 74157K101 53,039 7,811,300 SH SOLE 7,811,300 Techlabs, Inc.(1) COM 87833L103 653 960,307 SH DEFINED 960,307 Terra Networks, S.A. COM 23,741 3,119,767 SH DEFINED 1 3,119,767 Ventro Corporation COM 163595101 9 21,814 SH DEFINED 1 21,814 Ventro Corporation COM 163595101 1,271 3,177,914 SH DEFINED 2 3,177,914 Vicinity Corporation COM 925653107 522 303,569 SH DEFINED 1 303,569 Vicinity Corporation COM 925653107 7,895 4,590,058 SH DEFINED 2 4,590,058 Yahoo! Inc. COM 984332106 12,209 610,773 SH DEFINED 1 610,773 Yahoo! Inc. COM 984332106 34 1,702 SH DEFINED 2 1,702 Yahoo! Inc. COM 984332106 11,624 581,499 SH DEFINED 3 581,499 Yahoo! Inc. COM 984332106 1 17 SH SOLE 17 (1) yesmail.com, 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, but are not yet issued. The issuance of these shares is currently in dispute.