SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* JOYCE JOHN R (Last) (First) (Middle) C/O SILVER LAKE PARTNERS, L.P. 2725 SAND HILL ROAD, SUITE 150 (Street) MENLO PARK CA 94025 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 07/27/2005	3. Issuer Name and Ticker or Trading Symbol GARTNER INC [ IT ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock	37,740,128	I	See Footnote(1)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. See Exhibit 99.1 Attached

	/s/ John R. Joyce	08/04/2005
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

                                                                  Exhibit 99.1


Owned by Silver Lake Partners, L.P., Silver Lake Investors, L.P. and Silver
Lake Technology Investors, L.L.C. (collectively, the "Silver Lake Entities").
Silver Lake Technology Associates, L.L.C. is the General Partner of each of
Silver Lake Partners, L.P. and Silver Lake Investors, L.P. Silver Lake
Technology Management, L.L.C. is the Managing Member of Silver Lake Technology
Investors, L.L.C. Mr. Joyce, who became a member of the Board of Directors of
Gartner, Inc. on July 27, 2005, is a Managing Director of Silver Lake
Technology Associates, L.L.C. and a Managing Director of Silver Lake
Technology Management, L.L.C. This is not an admission that Mr. Joyce has any
voting or dispositive power over the shares. Mr. Joyce disclaims beneficial
ownership of these shares, except to the extent of his pecuniary interest
therein.