| Company Name Sort descending | Description | Membership Type |
|---|---|---|
| Occidental Chemical Corporation | Regular Member | |
| Odfjell USA (Houston) Inc. | Associate Member | |
| Ohmstede | Turnaround/Specialty Contractor Hard Crafts |
Associate Member |
| Oiltanking | Associate Member | |
| Old World Industries, LLC | Associate Member | |
| Olin Chlor Alkali Products and Vinyls | Associate Member | |
| Opportune LLP | Opportune LLP is an independent consultancy focused on the energy industry. We are led by seasoned professionals with senior executive experience in major energy and consulting firms. We serve clients in North America and throughout the world from our headquarters in Houston, and satellite offices in Denver and London. Across energy segments, our practice areas include corporate finance, complex financial reporting, process and technology, strategy and organization, dispute resolution, enterprise risk, tax and outsourcing. |
Associate Member |
| OSIsoft | Major producer of real time data management systems for the refining industry with supported interfaces to most of the control systems used in the industry. OSIsoft has 1400 people and operates in over 125 countries and offers their PI Software in 9 languages. |
Associate Member |
| Oxea Corporation | Regular Member |