1 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Amendment No. 1 to FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 GARTNER GROUP, INC. (Exact name of Registrant as specified in its charter) Delaware 04-3099750 (State of incorporation or organization) (IRS Employer Identification No.) Post Office Box 10212 56 Top Gallant Road Stamford, CT 06904-2212 (Address of principal executive offices) (Zip Code) Securities to be registered pursuant to Section 12(b) of the Act: Title of each class Name of each exchange on which to be so registered each class is to be registered ------------------- ------------------------------ Class A Preferred Share Purchase New York Stock Exchange Rights and Class B Preferred Share Purchase Rights Securities to be registered pursuant to Section 12(g) of the Act: None (Title of Class)

2 Item 1 Description of Securities to be Registered. On February 9, 2000, Gartner Group, Inc. (the "Company") adopted a Stockholder Rights Plan and entered into an Agreement with Bank Boston, N.A. as Rights Agent on February 10, 2000, which Agreement was amended by Amendment No. 1 to the Rights Agreement, dated as of April 11, 2000 (collectively, the "Rights Agreement"). In connection with the Rights Plan, the Company's Board of Directors declared a dividend of one Class A Preferred Share Purchase Right (a "Class A Right") to purchase one one-thousandth share of the Company's Series A Junior Participating Preferred Stock ("Series A Junior Preferred") for each outstanding share of the Company's Class A Common Stock ("Class A Common Share") and one Class B Preferred Share Purchase Right (a "Class B Right") to purchase one one-thousandth share of the Company's Series B Junior Participating Preferred Stock ("Series B Junior Preferred") for each outstanding share of the Company's Class B Common Stock, ("Class B Common Share") (collectively, the "Rights"). The record date for the dividend is as of the close of business on February 25, 2000. Each Class A Right entitles the registered holder to purchase from the Company one one-thousandth of a share of Series A Junior Preferred at an exercise price of ninety dollars ($90.00) (the "Purchase Class A Price"), and each Class B Right entitles the registered holder to purchase from the Company one one-thousandth of a share of Series B Junior Preferred at an exercise price of ninety dollars ($90.00) (the "Purchase Class B Price"), subject in each case to adjustment. Rights Evidenced by Common Share Certificates The Rights will not be exercisable until the Distribution Date (defined below). Separate Certificates for the Rights ("Rights Certificates") will not be sent to shareholders until the Distribution Date. Until the Distribution Date, the Class A Rights and Class B Rights will attach to and trade together with the Class A Common Shares and Class B Common Shares, respectively. Accordingly, Common Share certificates outstanding on the Record Date will evidence the Rights related thereto, and Common Share certificates issued after the Record Date will contain a notation incorporating the Rights Agreement by reference. Until the Distribution Date (or earlier redemption or expiration of the Rights), the surrender or transfer of any certificates for Common Shares outstanding as of the Record Date, will also constitute the transfer of the Rights associated with the Common Shares represented by such certificate. Distribution Date The Rights will separate from the Common Shares, Rights Certificates will be issued and the Rights will become exercisable upon the earlier of: (a) 10 days following a public announcement that a person or group of affiliated or associated persons (an "Acquiring Person") has acquired, or obtained the right to acquire, beneficial ownership of (i) 20% or more of the outstanding Class A Common Shares, or (ii) 20% of more of the outstanding Class B Common Shares, or (iii) 15% of the aggregate of the Class A Common Shares and the Class B Common Shares (each, a "Threshold Amount") or (b) 10 business days following the commencement of, or announcement of a tender offer or exchange offer the consummation of which would result in the beneficial ownership by a person or group of a Threshold Amount. The earliest of such dates is referred to as the "Distribution Date." -2-

3 Exclusion of Certain Investors The Rights Agreement provides that, in certain circumstances, the acquisition or ownership of a Threshold Amount by an "Excepted Person" will not result in the Rights becoming exercisable. In general terms, a person will be an Excepted Person if they own as passive investors 20% or more of the Class A Common Shares or Class B Common Shares at the time the Rights Agreement is entered into. A person will continue to be an Excepted Person after such date so long as the person continues to be a passive investor in the Company, does not increase his ownership of the applicable class of Common Shares by more than 1% and does not reduce his ownership of such shares below 19% of such class. Issuance of Rights Certificates; Expiration of Rights As soon as practicable following the Distribution Date, separate Rights Certificates will be mailed to holders of record of the Common Shares as of the close of business on the Distribution Date and such separate Rights Certificates alone will evidence the Rights from and after the Distribution Date. All Common Shares issued prior to the Distribution Date will be issued with Rights. The Rights will expire on the earliest of (i) February 25, 2010 (the "Final Expiration Date") or (ii) redemption or exchange of the Rights as described below. Initial Exercise of the Rights Following the Distribution Date, and until one of the further events described below, holders of the Rights will be entitled to receive, upon exercise and the payment of the Class A Purchase Price or the Class B Purchase Price, as the case may be, one one-thousandth of a share of the Series A Junior Preferred (in the case of a Class A Right) or one one-thousandth of a share of the Series B Junior Preferred (in the case of a Class B Right). In the event that the Company does not have sufficient Series A Junior Preferred or Series B Junior Preferred available for all Rights to be exercised, or the Board decides that such action is necessary and not contrary to the interests of Rights holders, the Company may instead substitute cash, assets or other securities for the Series A Junior Preferred and the Series B Junior Preferred for which the Rights would have been exercisable under this provision or as described below. Right to Buy Company Common Shares Unless the Rights have been redeemed, in the event that an Acquiring Person becomes the beneficial owner of a Threshold Amount, then each holder of a Right which has not been exercised (other than Rights beneficially owned by the Acquiring Person, which will thereafter be void) will have the right to receive, upon exercise, Class A Common Shares (in the case of Class A Rights) or Class B Common Shares (in the case of Class B Rights) having a value equal to two times the Class A Purchase Price or Class B Purchase Price, respectively. Rights are not exercisable following the occurrence of an event as described above until such time as the Rights are no longer redeemable by the Company as set forth below. -3-

4 Right to Buy Acquiring Company Stock Similarly, unless the Rights are redeemed, if, after an Acquiring Person becomes the beneficial owner of a Threshold Amount, (i) the Company is acquired in a merger or other business combination transaction, or (ii) 50% or more of the Company's consolidated assets or earning power are sold (other than in transactions in the ordinary course of business), proper provision must be made so that each holder of a Right which has not been exercised (other than Rights beneficially owned by the Acquiring Person, which will thereafter be void) will have the right to receive, upon exercise, shares of common stock of the acquiring company having a value equal to two times the Class A Purchase Price or the Class B Purchase Price, as the case may be. Exchange Provision At any time after the acquisition by an Acquiring Person of a Threshold Amount and prior to the acquisition by such Acquiring Person of 50% or more of the Company's outstanding Class A Shares or Class B Shares, the Board of Directors of the Company may exchange the Class A Rights and the Class B Rights (other than Rights owned by the Acquiring Person), in whole or in part, at an exchange ratio of one Class A Common Share per Class A Right and one Class B Common Share per Class B Right. Redemption At any time on or prior to the close of business on the earlier of (i) the Distribution Date, or (ii) the Final Expiration Date of the Rights, the Company may, at its option and with the approval of the Board of Directors, redeem the Rights in whole, but not in part, at a price of $0.001 per Right. Adjustments to Prevent Dilution The Class A Purchase Price and the Class B Purchase Price payable, the number of Class A Rights and Class B Rights, and the number of Series A Junior Preferred and Series B Junior Preferred or Class A Common Shares or Class B Common Shares or other securities or property issuable upon exercise of the Rights are subject to adjustment from time to time in connection with the dilutive issuances by the Company as set forth in the Rights Agreement. With certain exceptions, no adjustment in the Class A Purchase Price or Class B Purchase Price will be required until cumulative adjustments require an adjustment of at least 1% in such Purchase Price. Cash Paid Instead of Issuing Fractional Shares No fractional portion less than integral multiples of one Common Share will be issued upon exercise of a Right and in lieu thereof, an adjustment in cash will be made based on the market price of the Class A Common Shares (in the case of a Class A Right) or the Class B Common Shares (in the case of a Class B Right) on the last trading date prior to the date of exercise. -4-

5 No Stockholders' Rights Prior to Exercise Until a Right is exercised, the holder thereof, as such, will have no rights as a stockholder of the Company (other than any rights resulting from such holder's ownership of Common Shares), including, without limitation, the right to vote or to receive dividends. Amendment of Rights Agreement The terms of the Rights and the Rights Agreement may be amended in any respect without the consent of the Rights holders on or prior to the Distribution Date; thereafter, the terms of the Rights and the Rights Agreement may be amended without the consent of the Rights holders in order to cure any ambiguities or to make changes which do not adversely affect the interests of Rights holders (other than the Acquiring Person). Rights and Preferences of the Series A Junior Preferred and the Series B Junior Preferred Each one one-thousandth of a share of Series A Junior Preferred and each one one-thousandth of a share of Series B Junior Preferred has rights and preferences substantially equivalent to those of one Class A Common Share and one Class B Common Share, respectively. Certain Anti-takeover Effects The Rights approved by the Board are designed to protect and maximize the value of the outstanding equity interests in the Company in the event of an unsolicited attempt by an acquirer to take over the Company, in a manner or on terms not approved by the Board of Directors. Takeover attempts frequently include coercive tactics to deprive the Company's Board of Directors and its stockholders of a full opportunity to evaluate an offer in light of the long term prospects of the Company. The Rights have been declared by the Board in order to deter such tactics, including a gradual accumulation of shares in the open market of a Threshold Amount or greater position to be followed by a merger or a partial or two-tier tender offer that does not treat all stockholders equally. These tactics unfairly pressure stockholders, squeeze them out of their investment without giving them any real choice and deprive them of the full value of their shares. The Rights are not intended to prevent a takeover of the Company and will not do so. Since, subject to the restrictions described above, the Company may redeem the Rights prior to the Distribution Date, the Rights should not interfere with any merger or business combination approved by the Board of Directors. Issuance of the Rights does not weaken the financial strength of the Company or interfere with its business plans. The issuance of the Rights themselves has no dilutive effect, will not affect reported earnings per share, should not be taxable to the Company or to its shareholders, and will not change the way in which the Company's shares are presently traded. The Company's Board of Directors believes that the Rights represent a sound and reasonable means of addressing the complex issues of corporate policy created by the current takeover environment. -5-

6 The Rights may have the effect of rendering more difficult or discouraging an acquisition of the Company deemed undesirable by the Board of Directors. The Rights may cause substantial dilution to a person or group that attempts to acquire the Company on terms or in a manner not approved by the Company's Board of Directors, except pursuant to an offer conditioned upon the negation, purchase or redemption of the Rights. Item 2. Exhibits. 1. Rights Agreement, dated as of February 10, 2000 between Gartner Group, Inc., and Bank Boston, N.A., including the exhibits attached thereto.* 2. Amendment No. 1 dated as of April 11, 2000 to the Rights Agreement dated as of February 10, 2000 by and between Gartner Group, Inc. and Fleet National Bank (f/k/a Bank Boston, N.A.). - --------------- * Filed as Exhibit 1 to the Company's Registration Statement on Form 8-A filed March 7, 2000. -6-

7 Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereto duly authorized. GARTNER GROUP, INC. Date: May 12, 2000 By: /s/ Michael D. Fleisher Name: Michael D. Fleisher Title: Chief Executive Officer -7-

8 EXHIBIT INDEX ------------- Exhibit No. Description - ----------- ----------- 2 Amendment No. 1 to the Rights Agreement

1 AMENDMENT NO. 1 TO THE RIGHTS AGREEMENT This AMENDMENT NO. 1 (this "Amendment") dated as of April 11, 2000 to the Rights Agreement dated as of February 10, 2000 (the "Rights Agreement") by and between Gartner Group, Inc. a Delaware corporation (the "Company") and Fleet National Bank (f/k/a Bank Boston, N.A., a national banking association), as Rights Agent (the "Rights Agent"). RECITALS: WHEREAS, the Company has entered into a Securities Purchase Agreement dated as of March 21, 2000 (as such agreement may be amended, supplemented or otherwise modified from time to time, the "Purchase Agreement") with Silver Lake Partners, L.P. and certain related entities (the "Purchasers"); WHEREAS, pursuant to, and subject to the conditions set forth in, the Purchase Agreement, the Company proposes to issue to the Purchasers $300,000,000 of its 6% Convertible Junior Subordinated Promissory Notes due 2005 (the "Notes"); WHEREAS, subject to the terms and conditions set forth in the Notes, after the third anniversary of the issuance of the Notes, the Notes (or shares of preferred stock into which the Notes would convert under certain circumstances) would be convertible into more than 20% of the outstanding shares of the Company's Class A Common Stock par value $.0005 per share (the "Class A Common Stock"); WHEREAS, the Purchasers have agreed that for so long as the Purchasers' nominees to the Board of Directors of the Company (the "Board") are elected to, and not removed from, the Board and such Purchasers hold Notes or any other security issued upon conversion of the Notes, the Purchasers shall not directly or indirectly acquire additional shares of Class A Common Stock or Class B Common Stock par value $.0005 per share of the Company; WHEREAS, the Board of Directors has approved the Purchase Agreement and the transactions contemplated therein; and WHEREAS, it is a condition precedent to the issuance and sale of the Notes pursuant to the Purchase Agreement that the Company and the Rights Agent shall have executed this Amendment. NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration the receipt and sufficiency of which are hereby acknowledged, the Company and the Rights Agent hereby agree to amend the Rights Agreement as follows:

2 SECTION 1. Certain Definitions. Capitalized terms used herein without definition are used herein as defined in the Rights Agreement. SECTION 2. Amendment to the Rights Agreement. The definition of "Acquiring Person" set forth in Section 1(a) of the Rights Agreement is hereby amended by (i) replacing the "period" at the end of the third sentence thereof with the following "; and" and (ii) adding a new clause (iii) to the end thereof to read in full as follows: "(iii) if after the date hereof any Person or any of such Person's Affiliates or Associates, becomes the Beneficial Owner of a Threshold Amount pursuant to (or as contemplated by) an agreement that has been approved by the Board of Directors of the Company prior to such Person becoming an Acquiring Person, neither (i) such Person or any of such Person's Affiliates or Associates nor (ii) any transferee of such Person or such Person's Affiliates or Associates, provided that in the case of this subclause (ii) such transferee is not, either before or after giving effect to each such transfer, the Beneficial Owner of (x) 25% or more of the Class A Common Shares, (y) 20% or more of the Class B Common Shares or (z) 20% or more of the Company's Common Shares then outstanding, shall be or become an Acquiring Person, as defined pursuant to the foregoing provisions of this paragraph (a), unless and until such time as such Person or such Person's Affiliates, Associates or transferees shall become the Beneficial Owner of additional Common Shares (other than pursuant to a dividend or distribution paid or made by the Company on the outstanding Common Shares in Common Shares or pursuant to a split or subdivision of the outstanding Common Shares), unless, upon becoming the Beneficial Owner of such additional Common Shares, such Person is not then the Beneficial Owner of a Threshold Amount." SECTION 3. Effect of Amendment. Except as otherwise amended hereby, the Rights Agreement shall remain in full force and effect. SECTION 4. Governing Law. This Amendment shall be deemed to be a contract made under the laws of the State of Delaware and for all purposes shall be governed by and construed in accordance with the laws of such State applicable to contracts to be made and performed entirely within such State; provided, however, that all provisions regarding the rights, duties and obligations of the Rights Agent shall be governed by and construed in accordance with the laws of the State of New York applicable to contracts made and to be performed entirely within such State.

3 SECTION 5. Counterparts. This Amendment may be executed in any number of counterparts and each of such counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. SECTION 6. Descriptive Headings. Descriptive headings of the several Sections of this Amendment are inserted for convenience only and shall not control or affect the meaning or construction of any of the provisions hereof. * * * *

4 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to duly executed as of the day and year first above written. GARTNER GROUP, INC. By: __________________ Name: Title: FLEET NATIONAL BANK (F/K/A BANK BOSTON, N.A.) By: ____________________ Name: Title: