| AAS Group Holdings Ltd | Financial services | 2026 |
| Acco-Rexel Harmondsworth Limited | | 1955 |
| Airport Logistical Solutions Limited | Transport & logistics | 2011 |
| Airways Pension Scheme Trustee Limited | Financial services | 2016 |
| ALB Reinforcement&Construction Ltd | Construction | 2014 |
| Alsharie Alarabi Publications Limited | Information & communication | 2001 |
| AMP Aero Services Ltd | Wholesale & retail | 2024 |
| APS Speedbird One Limited | Financial services | 1988 |
| Aviation Business Continuity Limited | Transport & logistics | 2007 |
| Avios Group (AGL) Limited | Administrative & support | 1988 |
| BA and AA Holdings Limited | Professional & scientific | 1999 |
| BA Cash Management Limited Partnership | | 2008 |
| BA Cityflyer Limited | Transport & logistics | 1991 |
| BA European Limited | Transport & logistics | 2007 |
| BA Healthcare Trust Limited | Administrative & support | 2015 |
| BA Holdco Limited | Financial services | 2019 |
| BA Number One Limited | Professional & scientific | 2012 |
| Bailoy Associates LLP | | 2010 |
| Bailoy Products (Holdings) Limited | Professional & scientific | 2006 |
| Bailoy Products Limited | Manufacturing | 1975 |
| Bealine Limited | Extraterritorial | 2012 |
| Biggg Ltd | Information & communication | 2010 |
| BLU Property Portfolio Ltd. | Real estate | 2014 |
| Bordlex Limited | Wholesale & retail | 2025 |
| Britair Holdings Limited | Financial services | 1998 |
| British Airways (BA) Limited | Extraterritorial | 2012 |
| British Airways 777 Leasing Limited | Financial services | 2003 |
| British Airways Associated Companies Limited | Professional & scientific | 1957 |
| British Airways Avionic Engineering Limited | Manufacturing | 1993 |
| British Airways Engineering Gatwick Limited | Manufacturing | 2024 |
| British Airways Engineering Wales Limited | Manufacturing | 1987 |
| British Airways Holidays Limited | Administrative & support | 1955 |
| British Airways Interior Engineering Limited | Manufacturing | 1995 |
| British Airways Leasing Limited | Administrative & support | 2001 |
| British Airways Pension Services Limited | Financial services | 1995 |
| British Airways Pension Trustee (NO. 2) Limited | Financial services | 2002 |
| British Airways Pension Trustees Limited | Financial services | 1948 |
| British Airways PLC | Transport & logistics | 1983 |
| British Midland Airways Limited | Administrative & support | 1949 |
| British Midland Limited | Professional & scientific | 1987 |
| Cargo Innovations Limited | Extraterritorial | 2019 |
| Cera Family Holding Group Ltd | Financial services | 2025 |
| Cloudcrest Innovations Ltd | Information & communication | 2025 |
| Credicorp Limited | Information & communication | 2024 |
| Deluxe Barber Studio Ltd | Other services | 2024 |
| Doggypaw Ltd | Wholesale & retail | 2025 |
| Flylevel UK Limited | Professional & scientific | 2017 |
| Gatwick Ground Services Limited | Professional & scientific | 2016 |
| Ghulam Care Ltd | Health & social care | 2014 |
| IAG Loyalty Limited | Professional & scientific | 1993 |
| IAG Loyalty Retail Limited | Wholesale & retail | 2022 |
| Iberia Operadora UK Limited | Professional & scientific | 2020 |
| J a D Technology Limited | Information & communication | 2016 |
| Jssi Properties Ltd | Real estate | 2024 |
| M.Group Technologies Ltd. | Wholesale & retail | 2017 |
| Mher Ltd | Hospitality | 2016 |
| New Airways Pension Scheme Trustee Limited | Financial services | 2016 |
| Overseas Air Travel Limited | Administrative & support | 1995 |
| Pinnacle Property Management and Maintenance Limited | Real estate | 2016 |
| Shivamar Estates Limited | Real estate | 2016 |
| Smart Planner Co Ltd | Wholesale & retail | 2025 |
| Sword Arabia Ltd | Professional & scientific | 2026 |
| THE Five Bells (Harmondsworth) Ltd | Hospitality | 2025 |
| Wiltshier Construction (Thames Valley) Limited | Wholesale & retail | 1913 |
| Wiltshier Construction (Wessex) Limited | Wholesale & retail | 1978 |
| Wiltshier PLC | Professional & scientific | 1943 |