# EDGAR Filing Document

**Accession Number:** 0001539838
**File Stem:** 0001140361-26-003883
**Filing Date:** 2026-2
**Character Count:** 9049
**Document Hash:** b1f233c67e40f961afd16035275c071f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-26-003883.hdr.sgml**: 20260205

**ACCESSION NUMBER**: 0001140361-26-003883

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260205

**DATE AS OF CHANGE**: 20260205

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Diamondback Energy, Inc.
- **CENTRAL INDEX KEY:** 0001539838
- **STANDARD INDUSTRIAL CLASSIFICATION:** CRUDE PETROLEUM & NATURAL GAS [1311]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-87028
- **FILM NUMBER:** 26603070

**BUSINESS ADDRESS:**
- **STREET 1:** 500 WEST TEXAS AVENUE
- **STREET 2:** SUITE 100
- **CITY:** MIDLAND
- **STATE:** TX
- **ZIP:** 79701
- **BUSINESS PHONE:** 432-221-7400

**MAIL ADDRESS:**
- **STREET 1:** 500 WEST TEXAS AVENUE
- **STREET 2:** SUITE 100
- **CITY:** MIDLAND
- **STATE:** TX
- **ZIP:** 79701
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Greth Lyndal
- **CENTRAL INDEX KEY:** 0002021141

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** 8111 DOUGLAS AVENUE
- **STREET 2:** SUITE 1200
- **CITY:** DALLAS
- **STATE:** TX
- **ZIP:** 75225

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 4)**

**Diamondback Energy, Inc.**

*(Name of Issuer)*

**Common Stock, par value $0.01 per share**

*(Title of Class of Securities)*

**25278X109**

*(CUSIP Number)*

**Hillary H. Holmes**<br>Gibson, Dunn & Crutcher LLP<br>811 Main Street, Suite 3000<br>Houston TX 77002<br>(346) 718-6600

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**02/03/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **25278X109** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**SGF FANG Holdings, LP** | Name of reporting person<br>**SGF FANG Holdings, LP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**97686727.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**97686727.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**97686727.00** | Aggregate amount beneficially owned by each reporting person<br>**97686727.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**34.1%** | Percent of class represented by amount in Row (11)<br>**34.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

**Comment for Reporting Person:** Note to Row 13: Based upon 286,525,614 shares of Company Common Stock outstanding as of October 31, 2025, as disclosed by the Company in its Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on November 5, 2025.

| **CUSIP No.** | **25278X109** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Greth Lyndal** | Name of reporting person<br>**Greth Lyndal** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**97686727.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**97686727.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**97686727.00** | Aggregate amount beneficially owned by each reporting person<br>**97686727.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**34.1%** | Percent of class represented by amount in Row (11)<br>**34.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** Note to Row 13: Based upon 286,525,614 shares of Company Common Stock outstanding as of October 31, 2025, as disclosed by the Company in its Form 10-Q filed with the SEC on November 5, 2025.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.01 per share

**(b) Name of Issuer:**
Diamondback Energy, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
500 WEST TEXAS AVE., SUITE 1200, MIDLAND, TX, 79701

This Amendment No. 4 amends and supplements the statement on Schedule 13D originally filed with the SEC on September 13, 2024, as amended on September 24, 2024, August 15, 2025, and December 2, 2025 (the "Schedule 13D"), by the Reporting Persons with respect to shares of Company Common Stock. Unless otherwise defined herein, capitalized terms used in this Amendment No. 4 shall have the meanings ascribed to them in the Schedule 13D. Unless amended or supplemented below, the information in the Schedule 13D remains unchanged.

**Item 4. Purpose of Transaction**

Item 4 is hereby amended and supplemented to add the following:

Pursuant to the Repurchase Agreement, on February 3, 2026, the Company agreed to repurchase 1,000,000 shares of Company Common Stock held by SGF FANG at the most recent NASDAQ closing price of $162.88 per share, and on February 4, 2026, the Company agreed to repurchase 1,000,000 shares of Company Common Stock held by SGF FANG at the most recent NASDAQ closing price of $168.99 per share.

**Item 5. Interest in Securities of the Issuer**

**(a)**
Item 5(a) is hereby amended and restated in full.

The information contained on the cover pages and Item 2 to this Schedule 13D is incorporated herein by reference.

**(b)**
Item 5(b) is hereby amended and restated in full.

The information contained on the cover pages and Item 2 to this Schedule 13D is incorporated herein by reference.

**(c)**
Item 5(c) is hereby amended and supplemented to add the information set forth in Item 4 of this Schedule 13D.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

Item 6 is hereby amended and supplemented to add the information set forth in Item 4 of this Schedule 13D.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** SGF FANG Holdings, LP

**Signature:** /s/ Kevin T. Keen

**Name/Title:** Kevin T. Keen/Attorney-in-fact

**Date:** 02/05/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Greth Lyndal

**Signature:** /s/ Kevin T. Keen

**Name/Title:** Kevin T. Keen/Attorney-in-fact

**Date:** 02/05/2026