Exhibit 32.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL

FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, Robert W. Drummond, the Chief Executive Officer and Director of NexTier Oilfield Solutions Inc. (the “Company”), and Kenneth Pucheu, the Executive Vice President and Chief Financial Officer of the Company, hereby certify that, to their knowledge:

1. The Quarterly Report on Form 10-Q for the quarter ended June 30, 2023 of the Company (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: July 26, 2023

By:

/s/ Robert W. Drummond

Robert W. Drummond

Chief Executive Officer and Director

(Principal Executive Officer)

Date: July 26, 2023

By:

/s/ Kenneth Pucheu

Kenneth Pucheu

Executive Vice President and Chief Financial Officer

(Principal Financial Officer)

NEXTIER OILFIELD SOLUTIONS INC. 10-Q