<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED FINANCIAL STATEMENTS OF CMGI, INC. FOR THE QUARTER ENDED APRIL 30,
2000 AS SET FORTH IN ITS FORM 10-Q FOR SUCH QUARTER AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          JUL-31-2000
<PERIOD-START>                             AUG-01-1999
<PERIOD-END>                               APR-30-2000
<CASH>                                         674,288
<SECURITIES>                                 1,381,481
<RECEIVABLES>                                  213,576
<ALLOWANCES>                                         0
<INVENTORY>                                     40,209
<CURRENT-ASSETS>                             2,364,877
<PP&E>                                         219,894
<DEPRECIATION>                                       0
<TOTAL-ASSETS>                               8,939,371
<CURRENT-LIABILITIES>                        1,460,638
<BONDS>                                              0
<PREFERRED-MANDATORY>                          381,250
<PREFERRED>                                          0
<COMMON>                                         2,933
<OTHER-SE>                                   6,237,953
<TOTAL-LIABILITY-AND-EQUITY>                 8,939,731
<SALES>                                        503,078
<TOTAL-REVENUES>                               503,078
<CGS>                                          410,974
<TOTAL-COSTS>                                  410,974
<OTHER-EXPENSES>                             1,494,070
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              26,517
<INCOME-PRETAX>                              (802,446)
<INCOME-TAX>                                  (71,420)
<INCOME-CONTINUING>                          (731,026)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 (731,026)
<EPS-BASIC>                                     (2.94)
<EPS-DILUTED>                                   (2.94)