# EDGAR Filing Document

**Accession Number:** 0001185567
**File Stem:** 0000749251-26-000128
**Filing Date:** 2026-3
**Character Count:** 8168
**Document Hash:** 1aeb1fa92af979024898f367c0762e60
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000749251-26-000128.hdr.sgml**: 20260313

**ACCESSION NUMBER**: 0000749251-26-000128

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260311

**FILED AS OF DATE**: 20260313

**DATE AS OF CHANGE**: 20260313

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** GRABE WILLIAM O
- **CENTRAL INDEX KEY:** 0001185567

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-14443
- **FILM NUMBER:** 26752874

**MAIL ADDRESS:**
- **STREET 1:** 56 TOP GALLANT ROAD
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06904
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GARTNER INC
- **CENTRAL INDEX KEY:** 0000749251
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-MANAGEMENT SERVICES [8741]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 043099750
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 56 TOP GALLANT RD
- **STREET 2:** P O BOX 10212
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06904-2212
- **BUSINESS PHONE:** 2039640096

**MAIL ADDRESS:**
- **STREET 1:** 56 TOP GALLANT RD
- **STREET 2:** P O BOX 10212
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06904-2212

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GARTNER GROUP INC
- **DATE OF NAME CHANGE:** 19930823

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>GRABE WILLIAM O<br><sub>(Last) (First) (Middle)</sub><br>56 TOP GALLANT RD<br>P.O. BOX 10212<br><sub>(Street)</sub><br>STAMFORD, CT 06904-2212<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-03-11 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>GARTNER INC [ IT ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2026-03-11 |  | J<sup>(1)</sup> |  | 2100 | D | $160.01 | 47900 | I | 2025 GRAT<sup>(2)</sup> |
| Common Stock | 2026-03-11 |  | J<sup>(1)</sup> |  | 2100 | A | $160.01 | 2214 | D |  |
| Common Stock | 2026-03-11 |  | G<sup>(3)</sup> |  | 235 | D | $0 | 1979 | D |  |
| Common Stock | 2026-03-11 |  | G<sup>(3)</sup> |  | 235 | A | $0 | 235 | I | Family Trust 1<sup>(3)</sup> |
| Common Stock | 2026-03-11 |  | G<sup>(4)</sup> |  | 235 | D | $0 | 1744 | D |  |
| Common Stock | 2026-03-11 |  | G<sup>(4)</sup> |  | 235 | A | $0 | 235 | I | Family Trust 2<sup>(4)</sup> |
| Common Stock | 2026-03-11 |  | G<sup>(5)</sup> |  | 1410 | D | $0 | 334 | D |  |
| Common Stock | 2026-03-11 |  | G<sup>(5)</sup> |  | 1410 | A | $0 | 1410 | I | Family Trust 3<sup>(5)</sup> |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) Pursuant to a power of substitution, the reporting person, who is the trustee of the 2025 GRAT (see footnote 2 below for more information about the 2025 GRAT), transferred the shares from the 2025 GRAT to himself in exchange for a contribution of $336,021 by the reporting person to the 2025 GRAT. The transfer resulted in a decrease in the number of shares the reporting person beneficially owns indirectly through the 2025 GRAT and a corresponding increase in the number of shares the reporting person beneficially owns directly. The reporting person believes that this transfer of shares from the 2025 GRAT constitutes a change in form of beneficial ownership of the shares, exempted by Rule 16a-13 under the Securities Exchange Act of 1934.

(2) These shares are held in a grantor retained annuity trust created on August 22, 2025 when the reporting person transferred 50,000 Gartner shares to the trust (the "2025 GRAT"). These shares are held in trust for the benefit of the reporting person and his children. The reporting person is the Trustee of the 2025 GRAT.

(3) The reporting person transferred the shares to a family trust, Family Trust 1 ("Family Trust 1"). The reporting person disclaims beneficial ownership of the shares held by Family Trust 1 except to the extent, if any, of his pecuniary interest therein.

(4) The reporting person transferred the shares to a family trust, Family Trust 2 ("Family Trust 2"). The reporting person disclaims beneficial ownership of the shares held by Family Trust 2 except to the extent, if any, of his pecuniary interest therein.

(5) The reporting person transferred the shares to a family trust, Family Trust 3 ("Family Trust 3"). The reporting person disclaims beneficial ownership of the shares held by Family Trust 3 except to the extent, if any, of his pecuniary interest therein.

**Signature:** /s/ Kevin Tang for William O. Grabe  
**Date:** 2026-03-13

### Remarks:

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 4 (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.**