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| Name | Sector | Country | Member Since |
|---|---|---|---|
| OCON Medical | Commerce & Industry | Israel | 2014 |
| One Heart Worldwide | Civil Society | United States of America | 2022 |
| Optel Group | Commerce & Industry | Canada | 2017 |
| Options | Technical Support Agencies & Partnerships | United Kingdom | 2009 |
| Organisation of Eastern Caribbean States Commission (OECS) | Governmental Organisations | Saint Lucia | 2024 |
| Organon | Commerce & Industry | United States of America | 2021 |
| OSTROM CENTER | Foundations & Institutions of Higher Education | Nepal | 2023 |
| Pakachere Institute of Health and Development Communication | Civil Society | Malawi | 2024 |
| Palladium | Technical Support Agencies & Partnerships | United States of America | 2007 |
| Pamela Steele Associates (PSA Ltd) | Technical Support Agencies & Partnerships | United Kingdom | 2014 |