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              SUPPLEMENT NO. 9 TO PROSPECTUS DATED MARCH 12, 2001

                               [MANUGISTICS LOGO]

                                  $250,000,000

                 5% CONVERTIBLE SUBORDINATED NOTES DUE 2007 AND
               COMMON STOCK ISSUABLE UPON CONVERSION OF THE NOTES

     This is a ninth supplement to the Prospectus dated March 12, 2001 (the
"Prospectus"), relating to $250,000,000 principal amount of our 5% Convertible
Subordinated Notes due 2007 (the "Notes") and the shares of our common stock
issuable upon conversion of the Notes.

     The table in the "Selling Holders" section on pages 19-21 of the Prospectus
is hereby further supplemented by the addition of the following information
regarding Selling Holders, which information includes amounts which are in
addition to, and which, in some cases, may be in substitution for, amounts
listed for the same or other Selling Holders in the Prospectus and in prior
Supplements:



                                          PRINCIPAL AMOUNT OF      SHARES OF COMMON
                                          NOTES BENEFICIALLY      STOCK ISSUABLE UPON
             SELLING HOLDER                OWNED AND OFFERED    CONVERSION OF NOTES(1)
             --------------               -------------------   -----------------------
                                                          
Kentfield Trading, Ltd.(2)..............      $4,039,000                 91,665
Sage Capital(3).........................       2,000,000                 45,390
                                              ----------                -------
          Total.........................      $6,039,000                137,055
                                              ==========                =======


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(1) Based upon an initial conversion rate of approximately 22.695 shares of
    common stock per $1,000 principal amount of Notes and a cash payment in lieu
    of any fractional interest.

(2) The amounts listed are in addition to the amounts listed for the named
    Selling Holder in the Prospectus Supplement No. 5 dated May 3, 2001.

(3) The amounts listed are in addition to the amounts listed for the named
    Selling Holder in the Prospectus Supplement No. 6 dated June 20, 2001.

All of the other portions of the Prospectus, as previously supplemented, remain
                                   unchanged.

            The date of this Supplement No. 9 is September 11, 2001.