- Aleph Midstream
- Canadian Non-Operated Resources
- Carrier II
- Castex Energy
- Centennial Resource Development
- Fieldwood Energy
- Hammerhead Resources Inc. (formerly Canadian International Oil Corp.)
- ILX III
- Liberty Resources II
- Onyx Power
- Ridgebury H3 LLC
- Riverstone Credit Opportunities
- Capital Investment Analysis
Castex Energy is a private oil and gas company focused on exploration and development in South Louisiana and the Gulf of Mexico Shelf.
In September 2014, Riverstone committed up to $200 million (of which up to $67 million is from Riverstone Energy Limited) to Castex Energy 2014, a newly formed venture focusing on Castex's current and future drilling prospect inventory in the Gulf Coast Region.
In December 2014, Riverstone committed $150 million (of which approximately $50 million is from Riverstone Energy Limited) to Castex Energy 2005, which has more than 130 mmcfe/d of existing production.
Castex 2005 and Castex 2014 are both managed by Castex Energy, Inc., which has a 27 year operating history in exploration and development in South Louisiana and the Gulf of Mexico Shelf.