Form: 10-K

Annual report pursuant to Section 13 and 15(d)

February 23, 2022

Exhibit 21.1

Subsidiaries of Select Energy Services, Inc.

Entity

    

State of Formation

Select Agua Libre Midstream, LLC

Delaware

Complete Energy Services, LLC

Delaware

SES Holdings, LLC

 

Delaware

Select Energy Services, LLC

 

Delaware

Peak Oilfield Services, LLC

 

Texas

Rockwater Energy Solutions, LLC

 

Delaware

Tidal Logistics, Inc.

Texas