UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended: March 31, 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: Andrew J. Hajducky, III Executive Vice President, Chief Financial Officer and Treasurer (978) 684-3600 Signature, Place and Date of Signing: /s/ Andrew J. Hajducky, III - --------------------------- Andover, Massachusetts May 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: 21 ------ Form 13F Information Table Value Total: $292,307 (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 665 261,642 SH DEFINED 261,642 divine, inc. COM 255404105 7,694 4,749,287 SH SOLE 4,749,287 Engage, Inc. COM 292827102 109,166 151,873,081 SH SOLE 151,873,081 GLOBALMEDIA.COM COM 37935A109 57 1,822,127 SH SOLE 1,822,127 Juno Online Services, COM 482048105 655 581,862 SH DEFINED 581,862 Inc. marchFIRST, Inc. COM 966834103 1 3,045 SH DEFINED 1 3,045 Marketing Services COM 570907105 3,605 2,136,061 SH SOLE 2,136,061 Group, Inc. NaviSite, Inc. COM 63935M109 60,174 40,115,979 SH SOLE 40,115,979 Netcentives, Inc. COM 64108P101 1,694 1,694,492 SH SOLE 1,694,492 PRIMEDIA Inc. COM 74157K101 50,400 8,000,000 SH SOLE 8,000,000 Stancorp Financial COM 852891100 7 159 SH DEFINED 159 Group, Inc. Techlabs, Inc. (1) COM 87833L103 1,140 960,307 SH DEFINED 960,307 Terra Networks, S.A. COM 28,761 3,119,767 SH DEFINED 1 3,119,767 Ventro Corporation COM 163595101 764 1,018,350 SH DEFINED 2 1,018,350 Vicinity Corporation COM 925653107 8,176 4,590,058 SH DEFINED 2 4,590,058 Vicinity Corporation COM 925653107 458 257,205 SH DEFINED 1 257,205 Vicinity Corporation COM 925653107 83 46,364 SH DEFINED 1 46,364 Yahoo! Inc. COM 984332106 27 1,702 SH DEFINED 2 1,702 Yahoo! Inc. COM 984332106 9,620 610,773 SH DEFINED 1 610,773 Yahoo! Inc. COM 984332106 9,159 581,499 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.