SGF FANG trims Diamondback (NASDAQ: FANG) stake, still holds 26.3%

Rhea-AI Filing Summary

SGF FANG Holdings and Lyndal Greth updated their ownership in Diamondback Energy after SGF FANG sold 10,000,000 common shares at $204.25 per share on June 4, 2026.

They now report beneficial ownership of 74,036,722 shares, representing 26.3% of Diamondback’s common stock, based on 281,313,297 shares outstanding as of May 1, 2026. SGF FANG agreed to a 30‑day lock-up from June 4, 2026, during which it may not sell additional shares without mutual agreement with J.P. Morgan Securities LLC.

Insights

Equity ownership analyst

Large shareholder trims position but remains a major 26.3% owner.

SGF FANG Holdings sold 10,000,000 Diamondback Energy common shares at $204.25 on June 4, 2026, updating its Schedule 13D. Despite the sale, SGF FANG and Lyndal Greth still report beneficial ownership of 74,036,722 shares, or 26.3% of the company.

This indicates a significant liquidity event for one holder rather than a change in corporate fundamentals. A 30‑day lock-up from June 4, 2026 limits additional near-term selling unless SGF FANG and J.P. Morgan Securities LLC mutually agree, which can moderate immediate overhang from further block sales.

Key Figures

Shares sold: 10,000,000 shares Sale price: $204.25 per share Beneficial ownership: 74,036,722 shares +4 more

7 metrics

Shares sold 10,000,000 shares Common stock sold by SGF FANG on June 4, 2026

Sale price $204.25 per share Price for Diamondback common stock on June 4, 2026 sale

Beneficial ownership 74,036,722 shares Shares beneficially owned by SGF FANG and Lyndal Greth

Ownership percentage 26.3% Portion of Diamondback common stock class owned

Shares outstanding 281,313,297 shares Diamondback common stock outstanding as of May 1, 2026

Lock-up period 30 days From June 4, 2026, restricting further SGF FANG sales

Shared voting power 74,036,722 shares Shares with shared voting power for each reporting person

Key Terms

beneficially owned, shared voting power, shared dispositive power, Schedule 13D, +2 more

6 terms

beneficially owned financial

"11Aggregate amount beneficially owned by each reporting person 74,036,722.00"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"8 | Shared Voting Power 74,036,722.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"10 | Shared Dispositive Power 74,036,722.00"

Schedule 13D regulatory

"previously filed a statement on Schedule 13G to report the acquisition"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

lock-up period financial

"SGF FANG is subject to a lock-up period from June 4, 2026"

A lock-up period is a fixed time after a stock offering during which company insiders and early investors are legally barred from selling their shares. It matters because when that restriction expires a large block of previously locked-up shares can enter the market at once, potentially lowering the stock price or spiking trading volume—like opening a floodgate—so investors monitor these dates to anticipate price moves and manage risk.

percent of class financial

"13Percent of class represented by amount in Row (11) 26.3 %"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 06/05/2026 - 04:06 PM Accepted by SEC EDGAR 06/05/2026 - 04:05 PM Learn about SEC filing dates

FAQ

What change in ownership did SGF FANG report in Diamondback Energy (FANG)?

SGF FANG reported selling 10,000,000 Diamondback Energy common shares at $204.25 each on June 4, 2026. After this sale, SGF FANG and Lyndal Greth still beneficially own 74,036,722 shares, representing 26.3% of Diamondback’s outstanding common stock.

How large is SGF FANG’s remaining stake in Diamondback Energy (FANG)?

After the June 4, 2026 transaction, SGF FANG and Lyndal Greth report beneficial ownership of 74,036,722 Diamondback shares. This stake represents 26.3% of the company’s common stock, based on 281,313,297 shares outstanding as of May 1, 2026.

At what price did SGF FANG sell Diamondback Energy (FANG) shares?

SGF FANG sold an aggregate of 10,000,000 Diamondback Energy common shares at a price of $204.25 per share on June 4, 2026. This single-day block sale is disclosed in the amended Schedule 13D filing.

What lock-up restrictions apply to SGF FANG after the Diamondback share sale?

Following the June 4, 2026 sale, SGF FANG is subject to a 30-day lock-up starting that day. During this period, it may not sell additional Diamondback common shares without the mutual agreement of SGF FANG and J.P. Morgan Securities LLC.

How was the 26.3% ownership figure for SGF FANG in Diamondback (FANG) calculated?

The 26.3% ownership is based on 281,313,297 Diamondback common shares outstanding as of May 1, 2026. SGF FANG and Lyndal Greth beneficially own 74,036,722 shares, according to Diamondback’s Form 10-Q referenced in the Schedule 13D amendment.

Who are the reporting persons in the Diamondback Energy (FANG) Schedule 13D/A?

The amended Schedule 13D lists SGF FANG Holdings, organized in Delaware, and Lyndal Greth, a United States citizen, as reporting persons. Both report shared voting and dispositive power over 74,036,722 Diamondback Energy common shares.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 6)

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
Gibson, Dunn & Crutcher LLP, 811 Main Street, Suite 3000
Houston, TX, 77002
(346) 718-6600

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

06/04/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 25278X109

1

Name of reporting person

SGF FANG Holdings, LP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 74,036,722.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 74,036,722.00

11

Aggregate amount beneficially owned by each reporting person

74,036,722.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

26.3 %

14

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person:

Note to Row 13: Based upon 281,313,297 shares of Company Common Stock outstanding as of May 1, 2026, as disclosed by the Company in its Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on May 6, 2026.

SCHEDULE 13D

CUSIP Number(s): 25278X109

1

Name of reporting person

Greth Lyndal

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 74,036,722.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 74,036,722.00

11

Aggregate amount beneficially owned by each reporting person

74,036,722.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

26.3 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Note to Row 13: Based upon 281,313,297 shares of Company Common Stock outstanding as of May 1, 2026, as disclosed by the Company in its Form 10-Q filed with the SEC on May 6, 2026.

SCHEDULE 13D

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, TEXAS , 79701.
Item 1 Comment: This Amendment No. 6 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, December 2, 2025, February 5, 2026, and March 16, 2026 (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. 6 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: On June 4, 2026, SGF FANG sold an aggregate of 10,000,000 shares of Common Stock at a price of $204.25 per share pursuant to Rule 144 under the Securities Act of 1933, as amended (the "June 4, 2026 Sale"). In connection with the June 4, 2026 Sale, SGF FANG is subject to a lock-up period from June 4, 2026 through the date 30 days after June 4, 2026, during which SGF FANG may not sell any shares of Common Stock without the mutual agreement of SGF FANG and J.P. Morgan Securities LLC.
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.

SGF FANG Holdings, LP

Signature:	/s/ Kevin T. Keen
Name/Title:	Kevin T. Keen/Attorney-in-fact
Date:	06/05/2026

Greth Lyndal

Signature:	/s/ Kevin T. Keen
Name/Title:	Kevin T. Keen/Attorney-in-fact
Date:	06/05/2026