Exhibit A

Joint Filing Agreement

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing on behalf of each of them of a single statement on Schedule 13G (including amendments thereto) with respect to the Common Stock, par value $0.001, of Pioneer Energy Services Corp., a Delaware corporation, and that this Agreement may be included as an exhibit to such joint filing.

IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of October 27, 2021.

	Strategic Income Management, LLC

	/s/ Tim Black
	By: Tim Black
	Title: Chief Executive Officer


	American Beacon Advisors, Inc.

	/s/ Christina E. Sears
	By: Christina E. Sears
	Title: Vice President, Compliance


	Resolute Investment Managers, Inc.

	/s/ Christina E. Sears
	By: Christina E. Sears
	Title: Vice President, Compliance


	American Beacon SiM High Yield Opportunities Fund

	/s/ Christina E. Sears
	By: Christina E. Sears
	Title: Chief Compliance Officer and Assistant Secretary

PIONEER ENERGY SERVICES LLC SC 13G/A