| Person with significant control | APIRA LIMITED | 🇬🇧Regno Unito | Active | 08/12/2025 – present |
| Person with significant control | MEDICINES EVALUATION UNIT LIMITED | 🇬🇧Regno Unito | Active | 08/12/2025 – present |
| Person with significant control | CRO SOLUTIONS LIMITED | 🇬🇧Regno Unito | Active | 08/12/2025 – present |
| Person with significant control | PHARMASPECTRA GROUP LTD | 🇬🇧Regno Unito | Active | 07/12/2025 – present |
| Person with significant control | PHARMAREVIEW LIMITED | 🇬🇧Regno Unito | Active | 08/12/2025 – present |
| Person with significant control | CEUTA HOLDINGS LIMITED | 🇬🇧Regno Unito | Active | 19/05/2025 – 15/05/2025 |
| Person with significant control | EPS RESEARCH LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 25/06/2024 – present |
| Person with significant control | EPS SOFTWARE LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 26/06/2024 – present |
| Person with significant control | INFOCUS HEALTH LIMITED | 🇬🇧Regno Unito | Dissolved | 26/06/2024 – present |
| Person with significant control | OPTIMUM CONTACT LIMITED | 🇬🇧Regno Unito | Active | 22/06/2024 – present |
| Person with significant control | ARDENTIA INTERNATIONAL LIMITED | 🇬🇧Regno Unito | Dissolved | 24/06/2024 – present |
| Person with significant control | ALBATROSS FINANCIAL SOLUTIONS LTD. | 🇬🇧Regno Unito | Proposal to strike off | 21/06/2024 – present |
| Person with significant control | PHR TOPCO LIMITED | — | Liquidation | 26/06/2024 – present |
| Person with significant control | HEALTHCARE BUSINESS INFORMATION LIMITED | 🇬🇧Regno Unito | Active | 24/06/2024 – present |
| Person with significant control | IQVIA TECHNOLOGY SERVICES LTD. | 🇬🇧Regno Unito | Active | 26/06/2024 – present |
| Person with significant control | THEMIS LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 21/06/2024 – present |
| Person with significant control | IQVIA WORLD PUBLICATIONS LTD. | 🇬🇧Regno Unito | Active | 26/06/2024 – present |
| Person with significant control | IMS HEALTH SURVEYS LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 26/06/2024 – present |
| Person with significant control | IMS HOSPITAL GROUP LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 22/06/2024 – present |
| Person with significant control | CAMBRIDGE PHARMA CONSULTANCY LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 25/06/2024 – present |
| Person with significant control | INFOPHARM LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 26/06/2024 – present |
| Person with significant control | IMS INFORMATION SOLUTIONS UK LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 22/06/2024 – present |
| Person with significant control | IMS INFORMATION SOLUTIONS MEDICAL RESEARCH LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 24/06/2024 – present |
| Person with significant control | HOSPITAL MARKETING SERVICES LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 26/06/2024 – present |
| Person with significant control | IMS TECHNOLOGY SOLUTIONS UK LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 24/06/2024 – present |
| Person with significant control | SOURCE INFORMATICS LIMITED | 🇬🇧Regno Unito | Active | 26/06/2024 – 01/11/2023 |
| Person with significant control | IMS HEALTH NETWORKS LIMITED | 🇬🇧Regno Unito | Active | 20/06/2024 – 01/11/2023 |
| Person with significant control | PHARMADEALS LIMITED | 🇬🇧Regno Unito | Active | 26/06/2024 – present |
| Person with significant control | IQVIA SOLUTIONS UK LIMITED | 🇬🇧Regno Unito | Active | 21/06/2024 – present |
| Person with significant control | DATALINE SOFTWARE LIMITED | 🇬🇧Regno Unito | Active | 26/06/2024 – 01/11/2023 |
| Person with significant control | LH PERSPECTIVES LIMITED | 🇬🇧Regno Unito | Active | 21/06/2024 – present |
| Person with significant control | PHARMASPECTRA TOPCO LTD | — | Liquidation | 20/06/2024 – present |
| Person with significant control | PRIORITIS LIMITED | 🇬🇧Regno Unito | Active | 23/06/2024 – present |
| Person with significant control | LINGUAMATICS SOLUTIONS LIMITED | 🇬🇧Regno Unito | Active | 26/06/2024 – present |
| Person with significant control | REDSITE LIMITED | 🇬🇧Regno Unito | Proposal to strike off | 26/06/2024 – present |
| Person with significant control | IMS (UK) PENSION PLAN TRUSTEE COMPANY LIMITED | 🇬🇧Regno Unito | Active | 26/06/2024 – present |
| Person with significant control | IQVIA BIOTECH LTD. | 🇬🇧Regno Unito | Active | 26/06/2024 – present |
| Person with significant control | QH RESEARCH LIMITED | 🇬🇧Regno Unito | Active | 25/06/2024 – present |
| Person with significant control | DRUGDEV LIMITED | 🇬🇧Regno Unito | Active | 26/06/2024 – present |
| Person with significant control | GCE CLIN SOLUTIONS LIMITED | 🇬🇧Regno Unito | Active | 26/06/2024 – present |
| Person with significant control | IQVIA SOLUTIONS FINANCE UK V LTD. | 🇬🇧Regno Unito | Active | 21/06/2024 – present |
| Person with significant control | CLINTEC INTERNATIONAL LTD. | 🇬🇧Regno Unito | Active | 25/06/2024 – present |
| Person with significant control | IQVIA INVESTMENT HOLDINGS LIMITED | 🇬🇧Regno Unito | Active | 23/06/2024 – present |
| Person with significant control | Q SQUARED SOLUTIONS HOLDINGS LIMITED | 🇬🇧Regno Unito | Active | 04/05/2026 – 06/04/2016 |
