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, 2000 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: 28-______ 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 12, 2000 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: 24 --------- Form 13F Information Table Value Total: $ 7,697,360 (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. 28-_________ 2. CMG@Ventures Capital Corp. File No. 28-_________ 3. CMG@Ventures Securities Corp. File No. 28-_________

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 Akamai Technologies, Inc. COM 00971T101 40,203 250,000 SH SOLE 250,000 Critical Path, Inc. COM 22674V100 1,118 13,158 SH DEFINED 1 13,158 Critical Path, Inc. COM 22674V100 110,725 1,302,645 SH DEFINED 2 1,302,645 eMachines, Inc. COM 29076P102 6,600 1,100,056 SH DEFINED 1,100,056 Engage, Inc. (formerly Engage Technologies, Inc.) COM 292827102 3,322,761 87,083,572 SH SOLE 87,083,572 Hollywood Entertainment Corporation COM 436141105 18,768 2,327,934 SH SOLE 2,327,934 Hollywood Entertainment Corporation COM 436141105 164 20,297 SH DEFINED 1 20,297 Hollywood Entertainment Corporation COM 436141105 16,200 2,009,378 SH DEFINED 2 2,009,378 Lycos, Inc. COM 550818108 272,379 3,877,276 SH SOLE 3,877,276 Lycos, Inc. COM 550818108 240,520 3,423,773 SH DEFINED 1 3,423,773 Lycos, Inc. COM 550818108 352,877 5,023,156 SH DEFINED 2 5,023,156 Lycos, Inc. COM 550818108 150,845 2,147,258 SH DEFINED 3 2,147,258 Mail.com, Inc. COM 560311102 1,737 100,669 SH DEFINED 100,669 marchFIRST, Inc. COM 966834103 40 1,126 SH SOLE 1,126 marchFIRST, Inc. COM 966834103 544 15,243 SH DEFINED 1 15,243 marchFIRST, Inc. COM 966834103 3,978 111,468 SH DEFINED 3 111,468 Marketing Services Group, Inc. COM 570907105 39,974 2,252,061 SH SOLE 2,252,061 NaviSite, Inc. COM 63935M109 2,382,350 39,135,106 SH SOLE 39,135,106 Open Market, Inc. COM 68370M100 3,257 126,473 SH SOLE 126,473 Ventro Corporation COM 163595101 1,235 21,814 SH DEFINED 1 21,814 Ventro Corporation COM 163595101 122,285 2,159,564 SH DEFINED 2 2,159,564 Vicinity Corporation COM 925653107 191,578 5,513,024 SH DEFINED 1 5,513,024 Yahoo! Inc. COM 984332106 123,260 719,242 SH DEFINED 1 719,242 Yahoo! Inc. COM 984332106 293,962 1,715,314 SH DEFINED 2 1,715,314 (all share amounts have been adjusted to reflect all stock splits that have occurred prior to the date of the filing of this Form 13F)