SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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                                    FORM 8-K




                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



        Date of report (Date of earliest event reported): April 17, 2000
                               GARTNER GROUP, INC.
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               (Exact Name of Registrant as Specified in Charter)






           DELAWARE                      1-14443                 04-3099750
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(State or Other Jurisdiction     (Commission File Number)      (IRS Employer
      of Incorporation)                                      Identification No.)



                              Post Office Box 10212
                               56 TOP GALLANT ROAD
                             STAMFORD, CT 06904-2212
               (Address of Principal Executive Offices) (Zip Code)




       Registrant's telephone number, including area code: (203) 316-1111




ITEM 5. OTHER EVENTS

On April 17, 2000, Gartner Group, Inc. ("Gartner") issued and sold an aggregate
of $300 million principal amount of its unsecured 6% Convertible Junior
Subordinated Promissory Notes due April 17, 2005 (the "Notes") to Silver Lake
Partners, L.P. and certain of Silver Lake Partners, L.P.'s affiliates. The Notes
mature five years from the date of their issuance. After the third anniversary
of issuance, the principal amount of each Note plus all accrued interest may, at
the election of the holder, be converted into fully paid and nonassessable
shares of Gartner's Group Class A Common Stock, par value $.0005 per share,
subject to Gartner's right, under certain circumstances, to redeem the Notes for
cash in an amount equal to the unpaid principal amount of the Notes plus accrued
interest. The initial conversion price for the Notes is $15.87.

Gartner intends to use the proceeds from the sale of the Notes to prepay a
portion of the debt outstanding under its $500 million working capital facility
and to provide working capital to Gartner and its subsidiaries.

On April 14, 2000, Roger B. McNamee, co-founder and general partner of Integral
Capital Partners, and Glenn H. Hutchins, co-founder of Silver Lake Partners,
L.P., were appointed to the Gartner's board of directors to fill two vacancies
resulting from the resignations of John P. Imlay, Chairman, Imlay Investment
Inc., and Charles B. McQuade, President and Chief Executive Officer of
Securities Industry Automation Corporation.

ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS

(a)  Financial statements of business acquired.

     None

(b)  Pro forma financial information

     None

(c)  Exhibits

               10.1    Securities Purchase Agreement dated as
                       of March 21, 2000 between Gartner Group,
                       Inc., Silver Lake Partners, L.P., Silver
                       Lake Technology Investors, L.L.C. and
                       the other parties thereto.

               10.2    Amendment to the Securities Purchase
                       Agreement dated as of April 17, 2000
                       between Gartner Group, Inc., Silver Lake
                       Partners, L.P., Silver Lake Technology
                       Investors, L.L.C. and the other parties
                       thereto.






               10.3    Form of 6% Convertible Junior
                       Subordinated Promissory Note due April
                       17, 2005

               10.4.   Securityholders Agreement dated as of
                       April 17, 2000 among Gartner Group,
                       Inc., Silver Lake Partners, L.P. and the
                       other parties thereto.




                                   SIGNATURE

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

Dated:  April 24, 2000


                                       By:   /s/ Kenneth S. Siegel
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                                                 Kenneth S. Siegel
                                                 Executive Vice President
                                                 and General Counsel