Exhibit 21
SUBSIDIARIES OF THE REGISTRANT
| Name of Company | State or Country of Incorporation |
| 4D Directional Services, L.L.C. | United States, Delaware |
| Abbot Group Limited | United Kingdom |
| Abbot Holdings Limited | United Kingdom |
| Abbot Holdings Norge AS | Norway |
| Abbot Investments (North Africa) Limited | United Kingdom |
| Abbot Verwaltungsgesellschaft mbH | Germany |
| Bentec GmbH Drilling & Oilfield Systems | Germany |
| Bentec Personalservice GmbH | Germany |
| Clean Power Hydrogen plc | United Kingdom |
| Deutag Overseas (Curacao) NV | Curacao |
| DrillScan Asia & Middle East Pte. LTD | Singapore |
| DrillScan Asia & Middle East PTE. LTD. | Singapore |
| DrillScan Energy SAS | France |
| DrillScan Europe SAS | France |
| DrillScan SAS | France |
| Global Tender Barges Malaysia Sdn Bhd | Malaysia |
| Global Tender Barges Mexico S de R.L. de C.V. | Mexico |
| H&P Technologies International, Inc. | United States, Texas |
| Helmerich & Payne (Argentina) Drilling Co. | United States, Oklahoma |
| Helmerich and Payne (Argentina) Drilling Co. Argentina Branch Operations | Argentina |
| Helmerich & Payne (Australia) Drilling Pty Ltd | Australia |
| Helmerich & Payne (Boulder) Drilling Co. | United States, Oklahoma |
| Helmerich & Payne (Boulder) Drilling Co. Abu Dhabi Branch Operations | United Arab Emirates |
| Helmerich & Payne (Boulder) Drilling Co. Mozambique Branch Operations | Mozambique |
| Helmerich & Payne (Boulder) Drilling Co. Tunisia Branch Operations | Tunisia |
| Helmerich & Payne (Colombia) Drilling Co. | United States, Oklahoma |
| Helmerich & Payne (Colombia) Drilling Co. Colombia Branch Operations | Colombia |
| Helmerich & Payne Corporate Ventures, LLC | United States, Delaware |
| Helmerich & Payne de Venezuela, C.A. | Venezuela Bolivarian Republic of |
| Helmerich & Payne del Ecuador, Inc. | United States, Oklahoma |
| Helmerich & Payne International Drilling Co (Mc00108529) | United States, Delaware |
| Helmerich & Payne International Drilling Co. | United States, Delaware |
| Helmerich & Payne International Holdings, LLC | United States, Delaware |
| Helmerich & Payne Management, LLC | United States, Delaware |
| Helmerich & Payne Offshore, LLC | United States, Delaware |
| Helmerich & Payne Properties, Inc. | United States, Oklahoma |
| Helmerich & Payne Rasco, Inc. | United States, Oklahoma |
|
Helmerich & Payne Rasco, Inc. Bahrain Branch Operations |
Bahrain |
|
Helmerich & Payne Rasco, Inc. Peru Branch Operations |
Peru |
| Helmerich & Payne Technologies Canada, Inc. | Canada |
| Helmerich & Payne Technologies Private Limited | India |
| Helmerich & Payne Technologies UK Limited | Scotland |
| Helmerich & Payne Technologies, LLC | United States, Delaware |
| Helmerich & Payne, Inc. | United States, Delaware |
| Helmerich and Payne Drilling Muscat LLC | Oman |
| HP Falcon Investments, LLC | United States, Delaware |
|
HP Falcon Investments, LLC Abu Dhabi Branch |
United Arab Emirates |
| HP Global Holdings Limited | Jersey |
| HP Middle East Holdings Limited Company | Saudi Arabia |
| HP Middle East Holdings, LLC | United States, Delaware |
| HP Middle East Operations FZE | United Arab Emirates |
| HPO Holdco, LLC | United States, Delaware |
| ILI Corporation Limited | Cayman Islands |
| International Air Drilling Company Limited | Gibraltar |
| International Drilling Technology LLC | Oman |
| International Energy Services Jersey Holding Co. Ltd | Jersey |
| International Energy Services KSA Jersey Ltd | Jersey |
| International Energy Services ROW Jersey Ltd | Jersey |
| International Energy Services South America Co. Ltd | Jersey |
| KCA Deutag (Cyprus) Limited | Cyprus |
| KCA Deutag (Land Rig) Limited | United Kingdom |
| KCA Deutag (Nigeria) Limited | Nigeria |
| KCA Deutag Alpha Limited | United Kingdom |
| KCA Deutag Caspian Limited | United Kingdom |
| KCA Deutag Drilling Canada Inc | Canada |
| KCA Deutag Drilling GmbH | Germany |
| KCA Deutag Drilling Group Limited | United Kingdom |
| KCA Deutag Drilling Limited | United Kingdom |
| KCA Deutag Drilling Norge AS | Norway |
| KCA Deutag Drilling Offshore Services AS | Norway |
| KCA Deutag Drilling Saudi Arabia Ltd | Saudi Arabia |
| KCA Deutag Energy Global LLC | Oman |
| KCA Deutag Energy International LLC | Oman |
| KCA Deutag Energy LLC | Oman |
| KCA Deutag Energy National LLC | Oman |
| KCA Deutag Energy Rigs SPC | Oman |
| KCA Deutag Enterprises Limited | United Kingdom |
| KCA Deutag Europe B.V. | Netherlands |
| KCA Deutag GmbH | Germany |
| KCA Deutag Gulf Drilling Limited Company | Saudi Arabia |
| KCA Deutag Holdings Limited | Cyprus |
| KCA Deutag Holdings Norge AS | Norway |
| KCA Deutag International 2 Limited | United Kingdom |
| KCA Deutag International 3 Limited | United Kingdom |
| KCA Deutag International Limited | Jersey |
| KCA Deutag Investments B.V. | Netherlands |
| KCA Deutag Investments Ltd | British Virgin Islands |
| KCA Deutag Kazakhstan LLP | Kazakhstan |
| KCA Deutag Limited | United Kingdom |
| KCA Deutag LLC | United States, Texas |
| KCA Deutag MODU Operations AS | Norway |
| KCA Deutag Nederland B.V. | Netherlands |
| KCA Deutag Offshore AS | Norway |
| KCA Deutag Operations Services DMCC | Dubai |
| KCA Deutag Overseas Limited | Cyprus |
| KCA Deutag Pikco Plc | United Kingdom |
| KCA Deutag PTE Limited | United Kingdom |
| KCA Deutag PTE Limited | Singapore |
| KCA Deutag Rider Cooperatief U.A. | Netherlands |
| KCA Deutag Rig Co. Limited | United Kingdom |
| KCA Deutag Rig Design Services Limited | United Kingdom |
| KCA Deutag Technical Support Limited | United Kingdom |
| KCA Deutag Tender Barges (Offshore) Pte Ltd | Singapore |
| KCA Deutag Tiefbohrgesellschaft mbH | Germany |
| KCA Deutag UK Finance Plc | United Kingdom |
| KCA European Holdings Limited | United Kingdom |
| KCAD International DMCC | Dubai |
| Kenera Energy Solutions Limited | United Kingdom |
| Kenera Energy Solutions Middle East Limited | Saudi Arabia |
| Magnetic Variation Services, LLC | United States, Colorado |
| Motive Drilling Technologies, Inc. | United States, Delaware |
| Oman KCA Deutag Drilling Company LLC | Oman |
| Performance Drilling for Oil Services Ltd | Iraq |
| RDS Energy Solutions Limited | United Kingdom |
| Rig Design Services Holdings Limited | United Kingdom |
| Saudi International Energy Services Company Ltd | Saudi Arabia |
| Scissortail Assurance, LLC | United States, Oklahoma |
| SET Drilling Company Limited | United Kingdom |
| Space Center, Inc. | United States, Oklahoma |
| Surcon Ltd | United States, Colorado |
| TOB Bentec | Ukraine |
| Torquer Ltd. | Scotland |
| Turan Drilling and Engineering Company LLC | Azerbaijan |
| Utica Resources Co. | United States, Oklahoma |
| Utica Square Shopping Center, Inc. | United States, Oklahoma |
| White Eagle Assurance Company | United States, Vermont |