Exxon exits ProPetro with 16.6M-share block trade

Exxon Mobil Corporation and its Pioneer affiliates disclosed that they have exited their stake in ProPetro Holding Corp. They monetized their investment by selling 16,600,000 shares of ProPetro common stock in a block trade at .66 per share on May 20, 2026.

Rhea-AI Filing Summary

Exxon Mobil Corporation and its Pioneer affiliates disclosed that they have exited their stake in ProPetro Holding Corp. They monetized their investment by selling 16,600,000 shares of ProPetro common stock in a block trade at .66 per share on May 20, 2026. Following this sale, the reporting persons report 0.00 shares with 0% of the class, with no sole or shared voting or dispositive power.

Insights

Equity ownership analyst

Large shareholder fully exits ProPetro position, signaling a completed monetization.

Exxon Mobil and its Pioneer entities report selling 16,600,000 shares of ProPetro common stock in a block trade at .66 per share. After this transaction, they report no voting or dispositive power and an aggregate beneficial ownership of 0 shares, or 0% of the class.

This filing mainly updates ownership records, confirming that a former more‑than‑5% holder has fully exited. The sale size is notable in absolute terms, but the filing does not discuss reasons for the transaction or market context, so the information is best viewed as a structural change in the shareholder base.

Key Figures

Shares sold: 16,600,000 shares Sale price per share: .66 per share Sole voting power after sale: 0.00 shares +5 more

8 metrics

Shares sold 16,600,000 shares Block trade of ProPetro common stock on May 20, 2026

Sale price per share .66 per share Price stated for the 16,600,000-share block trade

Sole voting power after sale 0.00 shares Reported by each reporting person on cover pages

Shared voting power after sale 0.00 shares Reported by each reporting person on cover pages

Aggregate beneficial ownership 0.00 shares Post-transaction holdings reported by each reporting person

Percent of class owned 0% Percent of ProPetro common stock class after sale

Date ceased >5% owner May 20, 2026 Reported date reporting persons fell below five percent ownership

Date of event requiring filing May 18, 2026 Event date listed on the Schedule 13D/A cover

Key Terms

block trade, beneficial owners of more than five percent, sole voting power, shared dispositive power, +2 more

6 terms

block trade financial

"the Reporting Persons monetized their investment via a sale of 16,600,000 shares of Common Stock of the Issuer in a block trade .66 per share"

A block trade is a large, privately arranged sale or purchase of a company's shares or bonds between big investors, often negotiated to avoid upsetting the public market price. Think of it like selling a truckload of goods directly to one buyer instead of unloading it on a busy street — it moves a lot of supply at once and can signal shifting demand, affect immediate liquidity, and influence short-term stock prices.

beneficial owners of more than five percent regulatory

"On May 20, 2026, the Reporting Persons ceased to be beneficial owners of more than five percent of the Common Stock."

sole voting power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: | 7 | Sole Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

shared dispositive power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: | 10 | Shared Dispositive Power 0.00"

Schedule 13D regulatory

"If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this , and is filing this schedule"

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.

Annex A regulatory

"Item 2 is hereby amended and supplemented to include the updated Annex A hereto, which is incorporated herein by reference."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Exxon Mobil disclose about its ProPetro (PUMP) stake in this Schedule 13D/A?

Exxon Mobil and its Pioneer affiliates disclosed that they fully exited their ProPetro stake. They sold 16,600,000 shares of ProPetro common stock in a block trade at .66 per share and now report beneficial ownership of 0 shares, representing 0% of the outstanding class.

How many ProPetro (PUMP) shares did Exxon-related entities sell, and at what price?

The reporting persons sold 16,600,000 ProPetro common shares in a single block trade. The filing states the shares were sold at .66 per share. This transaction monetized their entire reported investment and resulted in their aggregate beneficial ownership dropping to zero.

Do Exxon and Pioneer entities still own any ProPetro (PUMP) shares after this amendment?

No, the reporting persons state they no longer own any ProPetro shares. The cover pages show 0.00 shares for sole and shared voting and dispositive power, an aggregate beneficially owned amount of 0.00 shares, and a corresponding 0% of the class after the reported sale.

When did Exxon-related entities cease being more than 5% owners of ProPetro (PUMP)?

The filing states they ceased to be beneficial owners of more than five percent on May 20, 2026. That same date, the reporting persons completed a block trade of 16,600,000 ProPetro common shares, which reduced their reported ownership to 0 shares and 0% of the class.

Which entities are included as reporting persons in this ProPetro (PUMP) Schedule 13D/A?

The reporting group includes Exxon Mobil and multiple Pioneer entities. Specifically, Exxon Mobil Corporation, Pioneer Natural Resources Company, Pioneer Natural Resources USA, Inc., and Pioneer Natural Resources Pumping Services LLC are listed, with ownership flowing through these subsidiaries before the complete exit.

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

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Accepted by SEC EDGAR 05/20/2026 - 05:30 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 2)

ProPetro Holding Corp.

(Name of Issuer)

Common Stock, $0.001 par value per share

(Title of Class of Securities)

74347M108

(CUSIP Number)

James R. Chapman
Exxon Mobil Corporation, 22777 Springwoods Village Parkway
Spring, TX, 77389
972-940-6000

Ferrell M. Keel
Jones Day, 2727 North Harwood Street
Dallas, TX, 75201
214-220-3939

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

05/18/2026

(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): 74347M108

1

Name of reporting person

Exxon Mobil Corporation

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

NEW JERSEY

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

0.00

12

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

13

Percent of class represented by amount in Row (11)

0 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

CUSIP Number(s): 74347M108

1

Name of reporting person

Pioneer Natural Resources Company

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 0.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

0.00

12

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

13

Percent of class represented by amount in Row (11)

0 %

14

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person:

Row 1: Pioneer Natural Resources Company, a Delaware corporation ("Pioneer"), is a direct wholly owned subsidiary of Exxon Mobil Corporation ("Exxon Mobil").

SCHEDULE 13D

CUSIP Number(s): 74347M108

1

Name of reporting person

Pioneer Natural Resources USA, Inc.

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 0.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

0.00

12

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

13

Percent of class represented by amount in Row (11)

0 %

14

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person:

Row 1: Pioneer Natural Resources USA, Inc., a Delaware corporation ("Pioneer USA"), is a direct wholly owned subsidiary of Pioneer.

SCHEDULE 13D

CUSIP Number(s): 74347M108

1

Name of reporting person

Pioneer Natural Resources Pumping Services LLC

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 0.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

0.00

12

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

13

Percent of class represented by amount in Row (11)

0 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Row 1: Pioneer Natural Resources Pumping Services LLC, a Delaware limited liability company ("Pioneer Pumping Services" and, together with Exxon Mobil, Pioneer and Pioneer USA, the "Reporting Persons"), is a direct wholly owned subsidiary of Pioneer USA.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, $0.001 par value per share
(b)	Name of Issuer: ProPetro Holding Corp.
(c)	Address of Issuer's Principal Executive Offices: One Marienfeld Place, 110 N. Marienfeld Street, Suite 300, Midland, TEXAS , 79701.
Item 1 Comment: Explanatory Note: This Amendment No. 2 ("Amendment No. 2") is being filed by Exxon Mobil Corporation ("Exxon Mobil"), Pioneer Natural Resources Company ("Pioneer"), Pioneer Natural Resources USA, Inc. ("Pioneer USA") and Pioneer Natural Resources Pumping Services LLC ("Pioneer Pumping Services" and, together with Exxon Mobil, Pioneer and Pioneer USA, the "Reporting Persons"), and amends the Schedule 13D filed with the U.S. Securities and Exchange Commission on January 7, 2019, as amended by Amendment No. 1 filed on May 3, 2024 (as so amended prior to the date hereof, the "Original Schedule 13D" and, as amended by this Amendment No. 2, the "Schedule 13D"), by Pioneer, Pioneer USA and Pioneer Pumping Services relating to shares of common stock, par value $0.001 per share ("Common Stock"), of ProPetro Holding Corp., a Delaware corporation (the "Issuer"). Information reported in the Original Schedule 13D remains in effect except to the extent that it is amended, restated or superseded by information contained in this Amendment No. 2. Capitalized terms used but not defined in this Amendment No. 2 have the respective meanings set forth in the Original Schedule 13D.
Item 2.	Identity and Background
(a)	Item 2 is hereby amended and supplemented to include the updated Annex A hereto, which is incorporated herein by reference.
Item 4.	Purpose of Transaction
	Item 4 is hereby amended and supplemented to include the following: On May 20, 2026, the Reporting Persons monetized their investment via a sale of 16,600,000 shares of Common Stock of the Issuer in a block trade pursuant to Rule 144 of the Securities Act of 1933, at a price of $16.66 per share.
Item 5.	Interest in Securities of the Issuer
(a)	The responses of the Reporting Persons to Rows (7) through (11), and (13) of the cover pages of this Schedule 13D are incorporated herein by reference.
(b)	The responses of the Reporting Persons to Rows (7) through (11), and (13) of the cover pages of this Schedule 13D are incorporated herein by reference.
(c)	Except as set forth in Item 4 of this Amendment No. 2, which information is incorporated by reference into this Item 5(c), the Reporting Persons have not effected any transactions of the Common Stock during the 60 days preceding the date of this report.
(e)	On May 20, 2026, the Reporting Persons ceased to be beneficial owners of more than five percent of the Common Stock.
Item 7.	Material to be Filed as Exhibits.
	Item 7 is hereby amended and supplemented to include the following: 99.6 Annex A

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.

Exxon Mobil Corporation

Signature:	/s/ James R. Chapman
Name/Title:	James R. Chapman, Vice President, Treasurer and Investor Relations
Date:	05/20/2026

Pioneer Natural Resources Company

Signature:	/s/ Daniel A. Bates
Name/Title:	Daniel A. Bates, Executive Vice President
Date:	05/20/2026

Pioneer Natural Resources USA, Inc.

Signature:	/s/ Daniel A. Bates
Name/Title:	Daniel A. Bates, Executive Vice President
Date:	05/20/2026

Pioneer Natural Resources Pumping Services LLC

Signature:	/s/ Daniel A. Bates
Name/Title:	Daniel A. Bates, Executive Vice President
Date:	05/20/2026