[Form 4] ProPetro Holding Corp. Insider Trading Activity

Rhea-AI Filing Summary

ProPetro Holding Corp. reported a major insider transaction involving an entity indirectly owned by Exxon Mobil Corporation. Pioneer Natural Resources Pumping Services LLC, a wholly owned subsidiary in Exxon's corporate chain, executed an open-market sale of 16,600,000 shares of ProPetro common stock at $16.66 per share. Following this sale, the reporting ownership position in ProPetro common stock was reduced to zero shares, indicating a complete exit by this indirect ten percent owner.

Insights

Equity ownership and governance analyst

Large indirect Exxon unit fully exits ProPetro equity position.

An entity indirectly owned by Exxon Mobil Corporation, Pioneer Natural Resources Pumping Services LLC, sold 16,600,000 ProPetro common shares in an open-market transaction at $16.66 per share. The filing shows post-transaction holdings of zero shares, marking a full divestment.

This represents the complete exit of a reported ten percent owner, which can materially change ProPetro’s shareholder base and voting dynamics. The transaction is purely a sale; there are no remaining derivative positions disclosed in this filing, so the former holder retains no visible equity exposure through this report.

The filing does not reference any Rule 10b5-1 trading plan or related hedging structures, so the timing context is not characterized as pre-planned here. Future company filings may provide additional color on any broader relationship changes between ProPetro and entities within the Exxon corporate group.

Insider Trade Summary

Net Seller: 16,600,000 shares ($276,556,000)

Net Sell 1 txn

Insider EXXON MOBIL CORP

Role null

Sold 16,600,000 shs ($276.56M)

Type	Security	Shares	Price	Value
Sale	Common Stock	16,600,000	$16.66	$276.56M

Holdings After Transaction: Common Stock — 0 shares (Indirect, See Explanation of Responses)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 16,600,000 shares Sale price: $16.66 per share Shares after transaction: 0 shares +2 more

5 metrics

Shares sold 16,600,000 shares Common stock sold in open-market transaction

Sale price $16.66 per share Price for ProPetro common stock sale

Shares after transaction 0 shares Total ProPetro common stock held following sale

Transaction code S Sale in open market or private transaction

Ownership type Indirect (I) Ownership through Exxon-related subsidiary chain

Key Terms

open-market sale, ten percent owner, indirect ownership, Form 4, +1 more

5 terms

open-market sale financial

"executed an open-market sale of 16,600,000 shares of ProPetro common stock"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

ten percent owner regulatory

"the reporting person is identified as a ten percent owner of ProPetro Holding Corp."

indirect ownership financial

"The reported securities are owned directly by Pioneer Natural Resources Pumping Services LLC within an indirect Exxon Mobil ownership chain"

Form 4 regulatory

"The Form 4 shows total ProPetro common stock holdings of 0 shares following the transaction"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

transaction code "S" regulatory

"The transaction code is “S,” described as a sale in an open market or private transaction"

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

X

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^*

EXXON MOBIL CORP

(Last) (First) (Middle)

22777 SPRINGWOODS VILLAGE PARKWAY

(Street)

SPRING TEXAS 77389

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ProPetro Holding Corp. [ PUMP ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/20/2026		S		16,600,000	D	$16.66	0	I	See Explanation of Responses(1)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The reported securities are owned directly by Pioneer Natural Resources Pumping Services LLC, which is a wholly owned subsidiary of Pioneer Natural Resources USA, Inc., which is a wholly owned subsidiary of Pioneer Natural Resources Company, which is a wholly owned subsidiary of Exxon Mobil Corporation.

	/s/ James R. Chapman, Vice President, Treasurer and Investor Relations	05/22/2026
	** Signature of Reporting Person	Date
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.
* Form 4: SEC 1474 (03-26)