THE CORPORATE LIBRARY

Related Party Transactions and Outside Related Director Information

Gartner, Inc. (IT)

4/24/2006 Proxy Information

ValueAct Capital Partners, L.P., ValueAct Capital Partners II, L.P., and ValueAct International, Ltd. own 18,631,646 shares (16.3%) VA Partners, L.L.C. is the General Partner of each of these entities. Mr. Ubben is a Managing Member of VA Partners, L.L.C. As such, Mr. Ubben could be deemed to have shared voting or dispositive power over these shares.

SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

Section 16(a) of the Securities Exchange Act of 1934, as amended, requires our executive officers, directors and persons who beneficially own more than 10% of our Common Stock to file reports of ownership and changes of ownership with the Securities and Exchange Commission and to furnish us with copies of the reports they file. Based solely on our review of the reports received by us, or written representations from certain reporting persons, we believe that all reports were timely filed.

CERTAIN RELATIONSHIPS AND TRANSACTIONS

RELATIONSHIP WITH SILVER LAKE PARTNERS, L.P.

On April 17, 2000, we issued and sold an aggregate of $300 million principal amount of our unsecured 6% Convertible Junior Subordinated Promissory Notes due April 17, 2005 to Silver Lake Partners, L.P. (“Silver Lake”) and certain of Silver Lake’s affiliates and to Integral Capital Partners IV, L.P. and one of its affiliates. In October 2003, these notes were converted into 49,441,122 shares of our Class A Common Stock which, following our 2005 reclassification, represented a like number of shares of our Common Stock. The determination of the number of shares issued upon the conversion was based upon a $7.45 conversion price and a convertible note of $368.3 million, consisting of the original face amount of $300 million plus accrued interest of $68.3 million. Silver Lake and its affiliates currently own 37,740,128 shares of our Common Stock. See “Security Ownership of Certain Beneficial Owners and Management” on page 20. In connection with the issuance of the notes, we agreed, among other things, that Silver Lake would recommend two nominees for director and we would include two Silver Lake nominees on our slate of nominees to be elected to our Board. This obligation exists while Silver Lake owns Common Stock representing at least 20 percent of the amount of Common Stock into which the notes were converted.

Michael J. Bingle and John R. Joyce, managing directors of the general partner of Silver Lake and members of some of the affiliates of Silver Lake, are Silver Lake’s nominees to our board.

Silver Lake purchased $113,700 in research and consulting services from us during 2005 and has contracted to purchase subscription research services from us in 2006 in the amount of $19,000.

RELATIONSHIPS WITH OTHER THIRD PARTIES

Several of our other directors are employed by companies that purchase our research and consulting services in the ordinary course of their business. The following chart shows the amount of research and consulting services purchased by each company during 2005 and the amount for which each company has signed commitments to date for 2006. (See page 22 of proxy for table).

5/24/2005 Proxy Information

The reclassification will increase the relative voting power of current holders of Class A Common Stock with respect to the election and removal of directors, particularly Silver Lake, who will own approximately 33.6% of our common stock on a combined basis and who have contractual rights to appoint two directors pursuant to the Amended and Restated Securityholders Agreement dated April 13, 2000, in addition to any other directors they may otherwise be able to elect as a result of their share ownership. Silver Lake Partners, L.P., Silver Lake Investors, L.P. and Silver Lake Technology Investors, L.L.C. own 37,740,128 shares of Class A Common Stock. 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. Glenn H. Hutchins and Michael J. Bingle, each of whom serves on our Board of Directors, are Managing Members and Officers of Silver Lake Technology Associates, L.L.C. and Senior Members of Silver Lake Technology Investors, L.L.C. As such, Mr. Hutchins and Mr. Bingle could be deemed to have shared voting or dispositive power over these shares. Mr. Hutchins and Mr. Bingle, however, disclaim beneficial ownership in these shares, except to the extent of their pecuniary interests.

On April 17, 2000, we issued and sold an aggregate of $300 million principal amount of our unsecured 6% Convertible Junior Subordinated Promissory Notes due April 17, 2005 to Silver Lake Partners, L.P. (“Silver Lake”) and certain of Silver Lake’s affiliates and to Integral Capital Partners IV, L.P. and one of its affiliates. In October 2003, these notes were converted into 49,441,122 shares of our Class A Common Stock. The determination of the number of shares issued upon the conversion was based upon a $7.45 conversion price and a convertible note of $368.3 million, consisting of the original face amount of $300 million plus accrued interest of $68.3 million. In connection with the issuance of the notes, we agreed, among other things, that Silver Lake would recommend two nominees for director and we would include two Silver Lake nominees on our slate of nominees to be elected to our Board. This obligation exists while Silver Lake owns Class A Common Stock representing at least 20 percent of the amount of Class A Common Stock into which the notes were converted.

Silver Lake purchased $112,200 in research and consulting services from us during 2004 and has contracted to purchase subscription research services from us in 2005 in the amount of $113,700.

RELATIONSHIPS WITH OTHER THIRD PARTIES

Several of our other directors are employed by companies that purchase our research and consulting services in the ordinary course of their business. The following table shows the amount of research and consulting services purchased by each company during 2004 and the amount for which each company has signed commitments to date for 2005:

Name of Company 2004 2005 Affiliated Director

Bain Capital, Inc. - 2004 - $ 107,635; 2005 - $ 91,550 Mr. Pagliuca Ebay, Inc. - 2004 - $ 164,000; 2005 - $ 37,250 Mr. Webb General Atlantic Partners, L.P. - 2004 - $ 407,500; 2005 - $ 205,000 Mr. Grabe Value Act Capital - 2004 - $ 113,265; 2005 - $ 16,734 - Mr. Ubben

4/29/2004 Proxy Information

ValueAct Capital Partners, L.P., ValueAct Capital Partners II, L.P., and ValueAct International, Ltd. own 8,560,100 shares (8.26%) of our Class A Common Stock and 5,122,546 shares (18.18%) of our Class B Common Stock. VA Partners, L.L.C. is the General Partner of each of these entities. Mr. Ubben is a Managing Member of VA Partners, L.L.C. As such, Mr. Ubben could be deemed to have shared voting or dispositive power over these shares.

RELATIONSHIP WITH SILVER LAKE PARTNERS, L.P.

On April 17, 2000, we issued and sold an aggregate of $300 million principal amount of our unsecured 6% Convertible Junior Subordinated Promissory Notes due April 17, 2005 to Silver Lake Partners, L.P. ("Silver Lake") and certain of Silver Lake's affiliates and to Integral Capital Partners IV, L.P. and one of its affiliates. In October 2003, these notes were converted into 49,441,122 shares of our Class A Common Stock. The determination of the number of shares issued upon the conversion was based upon a $7.45 conversion price and a convertible note of $368.3 million, consisting of the original face amount of $300 million plus accrued interest of $68.3 million. In connection with the issuance of the notes, we agreed, among other things, that Silver Lake would recommend two nominees for director and we would include two Silver Lake nominees on our slate of nominees to be elected to our Board. This obligation exists while Silver Lake owns Class A Common Stock representing at least 20 percent of the amount of Class A Common Stock into which the notes were converted.

Messrs. Bingle, Hutchins and Roux, managing members of the general partner of Silver Lake and members of some of the affiliates of Silver Lake, are Silver Lake's nominees to our board. Silver Lake purchased $140,809 in research and consulting services from us during 2003 and has contracted to purchase subscription research services from us in 2004 in the amount of $114,050.

RELATIONSHIPS WITH OTHER THIRD PARTIES

Several of our other directors, as well as our director nominee, are employed by companies that purchase our research and consulting services in the ordinary course of their business. The following chart shows the amount of research and consulting services purchased by each company during 2003 and the amount for which each company has signed commitments to date for 2004. (See proxy for chart).

1/17/2003 Proxy Information

Gartner, Inc. provides professional research services to Ameritrade Holding Corporation under a three-year contract, which expires October 2005. During fiscal 2003, the Ameritrade Holding Corporation paid approximately $0.1 million to Gartner, Inc. under the contract. Michael D. Fleisher, a Director of Ameritrade Holding Corporation, is Chairman and Chief Executive Officer of Gartner, Inc. Glenn H. Hutchins and Stephen G. Pagliuca, Directors of the Company, are directors of Gartner, Inc.

On April 17, 2000, we issued and sold an aggregate of $300 million principal amount of our unsecured 6% Convertible Junior Subordinated Promissory Notes due April 17, 2005 to Silver Lake Partners, L.P. ("Silver Lake") and certain of Silver Lake's affiliates and to Integral Capital Partners IV, L.P. and one of its affiliates. In connection with the issuance of the Notes, we agreed that Silver Lake would recommend two nominees for director and we would include the Silver Lake nominees on our slate of nominees to be elected to our Board. This obligation exists while Silver Lake owns the Notes, or Class A Common Stock that, on an "as converted" basis, represents at least 20 percent of our Class A Common Stock into which the Notes were convertible when they were issued. As of December 31, 2002, if Silver Lake were to convert the notes into shares, it would own more than 20 percent of our Class A Common Stock. Mr. Hutchins and Mr. Roux are each a nominee of Silver Lake.

Silver Lake purchased subscription research services from us between September 1, 2001 and August 31, 2002 for $106,000 and has contracted to purchase subscription research services from us between September 1, 2002 to August 31, 2003 for $150,000.