| Company Name | Entity type | Parent/Subsidiary/Independent | Headquarters | No. of Employees | Annual Revenue ($M) | |
|---|---|---|---|---|---|---|
| Osler, Hoskin & Harcourt LLP | Private | Independent | Canada | XYZ | XYZ | |
| Osler Logging Inc | Private | Independent | United States of America | XYZ | XYZ | |
| Hoskin Ryan Consultants, Inc. | Private | Subsidiary (of Huitt-Zollars Inc ) | United States of America | XYZ | XYZ | |
| Houghton Mifflin Harcourt Co | Private | Parent | United States of America | XYZ | 1,051 | |
| NNPC Ltd | Private | Parent | Nigeria | XYZ | XYZ | |
| Osler Technology | Private | Independent | Australia | XYZ | XYZ | |
| Osler Inc | Private | Independent | United States of America | XYZ | XYZ | |
| Harcourt Chiropractic Office | Private | Independent | United States of America | XYZ | XYZ | |
| Harcourt Assessment, Inc | Private | Independent | United States of America | XYZ | XYZ | |
| Osler Investors LLC | Private | Independent | United States of America | XYZ | XYZ | |
| OSLER Diagnostics Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Steve Hoskin Construction Limited | Private | Independent | United Kingdom | XYZ | XYZ | |
| Murray Harcourt Limited | Private | Independent | United Kingdom | XYZ | XYZ | |
| Harcourt Developments Ltd | Private | Independent | Ireland | XYZ | XYZ | |
| Harcourt Energy Partners LLC | Private | Independent | United States of America | XYZ | XYZ | |
| African Refineries Port Harcourt Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Port Harcourt Refining Co Ltd | Private | Subsidiary (of NNPC Ltd ) | Nigeria | XYZ | XYZ | |
| University of Port-Harcourt Teaching Hospital | Institution | Subsidiary (of University of Port Harcourt ) | Nigeria | XYZ | XYZ | |
| E. F. Hoskin & Associates Pty Ltd | Private | Independent | Australia | XYZ | XYZ | |
| Port Harcourt Electricity Distribution Company Plc | Private | Subsidiary (of Power Holding Company of Nigeria PLC ) | Nigeria | XYZ | XYZ | |
| SpicyBlogs4U Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Theo General Service Co Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Folstaj International Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Digital Horizon Co Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Mobirevo | Private | Independent | Nigeria | XYZ | XYZ | |
| Petrosmart Oilfield Services | Private | Independent | Nigeria | XYZ | XYZ | |
| Grandeur Subserv Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Cleanwaters Refinery Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Timiun | Private | Independent | Nigeria | XYZ | XYZ | |
| Kohasa Engineering Co Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Frazoil Exploration and Production Ltd | Private | Subsidiary (of Oilserv Ltd ) | Nigeria | XYZ | XYZ | |
| RivGas Petroleum and Energy Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| TideRx Limited | Private | Independent | Nigeria | XYZ | XYZ | |
| The Shell Petroleum Development Co of Nigeria Ltd | Private | Subsidiary (of Shell plc ) | Nigeria | XYZ | XYZ | |
| Dateline Energy Services Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Subsaharan Atlantic Energy Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Shorelink Oil and Gas Services Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| 7 Waves Petroleum Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Indorama Fertilizers B.V. | Private | Independent | Nigeria | XYZ | XYZ | |
| Pyloop | Private | Independent | Nigeria | XYZ | XYZ | |
| FLITBASE | Private | Independent | Nigeria | XYZ | XYZ | |
| Emerald Energy Institute | Institution | Subsidiary (of University of Port Harcourt ) | Nigeria | XYZ | XYZ | |
| Bridgsite Nigeria Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Vhelbherg Exploration & Production Development Co Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Somora GTP Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Gsp.ng | Private | Independent | Nigeria | XYZ | XYZ | |
| Farmers Parlor | Private | Independent | Nigeria | XYZ | XYZ | |
| Siat Nigeria Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Twin Summit Resources Ltd | Private | Independent | Nigeria | XYZ | XYZ | |
| Steering International Nigeria Ltd | Private | Independent | Nigeria | XYZ | XYZ |
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