| | | | | |
| SUBSIDIARY | STATE/COUNTRY |
| |
| GEODynamics, Inc. | Delaware |
| |
| GEODynamics (U.K.) Limited | United Kingdom |
| |
| Oil States Energy Services (Canada) Inc. | Alberta, Canada |
| |
| Oil States Energy Services Holding, Inc. | Delaware |
| |
| Oil States Energy Services L.L.C. | Delaware |
| |
| OIS Cyprus Limited | Cyprus |
| |
| Oil States Industries, Inc. | Delaware |
| |
| Oil States Industries (Asia) Pte Ltd. | Singapore |
| |
| Oil States Industries do Brasil - Instalacoes Maritimas Ltda | Brazil |
| |
| Oil States Industries 1 B.V. | Netherlands |
| |
| Oil States Industries Netherlands, C.V. | Netherlands |
| |
| Oil States Industries (India) Private Limited | India |
| |
| Oil States Industries Singapore Holdco B.V. | Netherlands |
| |
| Oil States Industries US, Inc. | Delaware |
| |
| Oil States Industries (UK) Limited | United Kingdom |
| |
| Oil States Management Inc. | Delaware |
| |
| Oil States Industries (Thailand) Ltd. | Thailand |
| |
| Oil States Skagit SMATCO L.L.C. | Delaware |
| |
| OSES International, LLC | Delaware |
| |
| Tempress Technologies, Inc. | Washington |