| | | | | |
| Name | Jurisdiction |
| Compressco, Inc. | Delaware |
| Compressco Testing, L.L.C. | Oklahoma |
| Compressco Field Services, LLC | Oklahoma |
| TETRA Applied Holding Company | Delaware |
| TETRA Brine Leaseco LLC | Delaware |
| TETRA Bromine Project LLC | Delaware |
| TETRA Evergreen Unit LLC | Delaware |
| TETRA Production Testing Holding LLC | Delaware |
| T-Production Testing, LLC | Texas |
| TETRA Production Testing Services, LLC | Delaware |
| TETRA Financial Services, Inc. | Delaware |
| TETRA-Hamilton Frac Water Services, LLC | Oklahoma |
| TETRA International Incorporated | Delaware |
| TETRA Middle East for Oil & Gas Services LLC | Saudi Arabia |
| TETRA de Argentina SRL | Argentina |
| TETRA Foreign Investments, LLC | Delaware |
| TETRA International Holdings, B.V. | Netherlands |
| T-International Holdings C.V. | Netherlands |
| TETRA Netherlands, B.V. | Netherlands |
| TETRA Oilfield Services Ghana Limited | Ghana |
| TETRA Oilfield Services (Holding) Limited | Ghana |
| TETRA Chemicals Europe AB | Sweden |
| TETRA Chemicals Europe OY | Finland |
| TETRA Egypt (LLC) | Egypt |
| TNBV Oilfield Services Ltd. | British Virgin Islands |
| Well TETRA for Oil Services LLC | Iraq |
| TETRA Investments Company U.K. Limited | United Kingdom |
| Optima Solutions Holdings Limited | United Kingdom |
| Optima Solutions U.K. Limited | United Kingdom |
| TETRA Technologies de Mexico, S.A. de C.V. | Mexico |
| TETRA Technologies do Brasil, Limitada | Brazil |
| TETRA Technologies U.K. Limited | United Kingdom |
| Optima Solutions Malaysia SDN BHD | Malaysia |
| TETRA Technologies Nigeria Limited | Nigeria |
| Tetra-Medit Oil Services | Libya |
| TETRA Madeira, Unipessoal Lda | Portugal |
| TETRA (Thailand) Limited | Thailand |
| TETRA Yemen for Oilfield Services Co., Ltd. | Yemen |
| Greywolf Energy Services Ltd. | Canada |
| TETRA International Holdings Inc. | Delaware |
| TETRA UK Holdings Limited | United Kingdom |
| TETRA Process Services, L.C. | Texas |
| TETRA Micronutrients, Inc. | Texas |