X0202 SCHEDULE 13D/A 0000034088 XXXXXXXX LIVE 2 Common Stock, $0.001 par value per share 05/18/2026 false 0001680247 74347M108 ProPetro Holding Corp.

One Marienfeld Place 110 N. Marienfeld Street, Suite 300 Midland TX 79701

James R. Chapman 972-940-6000 Exxon Mobil Corporation 22777 Springwoods Village Parkway Spring TX 77389 Ferrell M. Keel 214-220-3939 Jones Day 2727 North Harwood Street Dallas TX 75201 0000034088 N Exxon Mobil Corporation OO N NJ 0 0 0 0 0 N 0 CO 0001038357 N Pioneer Natural Resources Company OO N DE 0 0 0 0 0 N 0 CO Row 1: Pioneer Natural Resources Company, a Delaware corporation ("Pioneer"), is a direct wholly owned subsidiary of Exxon Mobil Corporation ("Exxon Mobil"). 0000846920 N Pioneer Natural Resources USA, Inc. OO N DE 0 0 0 0 0 N 0 CO Row 1: Pioneer Natural Resources USA, Inc., a Delaware corporation ("Pioneer USA"), is a direct wholly owned subsidiary of Pioneer. 0001763628 N Pioneer Natural Resources Pumping Services LLC OO N DE 0 0 0 0 0 N 0 OO 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. Common Stock, $0.001 par value per share ProPetro Holding Corp. One Marienfeld Place 110 N. Marienfeld Street, Suite 300 Midland TX 79701 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reported in the Original Schedule 13D remains in effect except to the extent that it is amended, restated or superseded by information contained in this Amendment No. 2.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 is hereby amended and supplemented to include the updated Annex A hereto, which is incorporated herein by reference. 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. 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. 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. 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. On May 20, 2026, the Reporting Persons ceased to be beneficial owners of more than five percent of the Common Stock. Item 7 is hereby amended and supplemented to include the following: 99.6 Annex A Exxon Mobil Corporation /s/ James R. Chapman 05/20/2026 Pioneer Natural Resources Company /s/ Daniel A. Bates 05/20/2026 Pioneer Natural Resources USA, Inc. /s/ Daniel A. Bates 05/20/2026 Pioneer Natural Resources Pumping Services LLC /s/ Daniel A. Bates 05/20/2026