EXHIBIT 32.1

CERTIFICATION OF 

CHIEF EXECUTIVE OFFICER UNDER SECTION 906 OF THE 

SARBANES OXLEY ACT OF 2002, 18 U.S.C. § 1350

In connection with the Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2022 of Nine Energy Service, Inc. (the “Company”) as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Ann G. Fox, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
		/s/ Ann G. Fox
		Ann G. Fox
		President, Chief Executive Officer and Director
		(Principal Executive Officer)
		Date:	August 3, 2022