PUMP · ProPetro Holding Corp.

On August 5, 2026, the reporting person made bona fide gifts of an aggregate of 15,000 shares.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.08 to $11.28, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4.

Reflects shares of Common Stock withheld to satisfy taxes payable in connection with the vesting and settlement of previously awarded RSUs.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On August 1, 2025, the reporting person was granted 100,482 RSUs, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.

Each Restricted Stock Unit ("RSU") represents a contingent right to receive either one share of the Issuer's common stock ("Common Stock") or an amount of cash equal to the fair market value of one share of Common Stock. The RSUs will vest in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2027 and May 20, 2027.

Each Restricted Stock Unit ("RSU") represents a contingent right to receive either one share of the Issuer's common stock ("Common Stock") or an amount of cash equal to the fair market value of one share of Common Stock. The RSUs will vest in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2027 and May 20, 2027.

Each Restricted Stock Unit ("RSU") represents a contingent right to receive either one share of the Issuer's common stock ("Common Stock") or an amount of cash equal to the fair market value of one share of Common Stock. The RSUs will vest in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2027 and May 20, 2027.

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.

Each Restricted Stock Unit ("RSU") represents a contingent right to receive either one share of the Issuer's common stock ("Common Stock") or an amount of cash equal to the fair market value of one share of Common Stock. The RSUs will vest in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2027 and May 20, 2027.

Each Restricted Stock Unit ("RSU") represents a contingent right to receive either one share of the Issuer's common stock ("Common Stock") or an amount of cash equal to the fair market value of one share of Common Stock. The RSUs will vest in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2027 and May 20, 2027.

Each Restricted Stock Unit ("RSU") represents a contingent right to receive either one share of the Issuer's common stock ("Common Stock") or an amount of cash equal to the fair market value of one share of Common Stock. The RSUs will vest in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2027 and May 20, 2027.

Each Restricted Stock Unit ("RSU") represents a contingent right to receive either one share of the Issuer's common stock ("Common Stock") or an amount of cash equal to the fair market value of one share of Common Stock. The RSUs will vest in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2027 and May 20, 2027.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On May 21 2025, the reporting person was granted 28,181 RSUs, vesting in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2026 and May 21, 2026.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On May 21 2025, the reporting person was granted 28,181 RSUs, vesting in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2026 and May 21, 2026.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On May 21 2025, the reporting person was granted 28,181 RSUs, vesting in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2026 and May 21, 2026.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On May 21 2025, the reporting person was granted 28,181 RSUs, vesting in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2026 and May 21, 2026.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On May 21 2025, the reporting person was granted 28,181 RSUs, vesting in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2026 and May 21, 2026.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On May 21 2025, the reporting person was granted 28,181 RSUs, vesting in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2026 and May 21, 2026.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On May 21 2025, the reporting person was granted 28,181 RSUs, vesting in full upon the earlier to occur of the day immediately preceding the Issuer's annual meeting of stockholders in 2026 and May 21, 2026.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Each restricted stock unit ("RSU") represents a contingent right to receive either one share of common stock of the Issuer ("Common Stock") or an amount of cash equal to the fair market value of one share of Common Stock.

The RSUs will vest in two installments, with 40% vesting on November 1, 2027 and the remaining 60% vesting on May 1, 2029.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On March 4, 2025, the reporting person was granted 112,233 RSUs, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On March 4, 2025, the reporting person was granted 56,117 RSUs, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Reflects shares of Common Stock withheld to satisfy taxes payable in connection with the vesting and settlement of previously awarded RSUs.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On March 4, 2025, the reporting person was granted 17,957 RSUs, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On March 4, 2025, the reporting person was granted 56,117 RSUs, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.

Reflects shares of Common Stock withheld to satisfy taxes payable in connection with the vesting and settlement of previously awarded RSUs.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On March 4, 2025, the reporting person was granted 252,525 RSUs, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.

Reflects shares of Common Stock withheld to satisfy taxes payable in connection with the vesting and settlement of previously awarded RSUs.

Reflects shares of Common Stock withheld to satisfy taxes payable in connection with the vesting and settlement of previously awarded RSUs.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Reflects shares of Common Stock withheld to satisfy taxes payable in connection with the vesting and settlement of previously awarded RSUs.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Reflects shares of Common Stock withheld to satisfy taxes payable in connection with the vesting and settlement of previously awarded RSUs.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On February 28, 2024, the reporting person was granted 125,786 RSUs, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.

Reflects shares of common stock of the Issuer ("Common Stock") delivered upon vesting and settlement of previously awarded restricted stock units ("RSUs").

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

Reflects shares of Common Stock withheld to satisfy taxes payable in connection with the vesting and settlement of previously awarded RSUs.

Each RSU represents a contingent right to receive either one share of Common Stock or an amount of cash equal to the fair market value of one share of Common Stock.

On February 28, 2024, the reporting person was granted 242,830 RSUs, vesting in three substantially equal annual installments beginning on the first anniversary of the grant date.