| Ageas Insurance Staff Pension Scheme Trustee Limited | Eastleigh | 2025 |
| Ageas Retail Limited | Eastleigh | 1977 |
| Ageas Services (UK) Limited | Eastleigh | 1922 |
| Agebanque SA Ltd | Bradford | 2019 |
| Agecare UK Holdings Ltd | Watford | 2022 |
| Agecko Holdings Limited | Easingwold | 2021 |
| Agecroft Masha Limited | Manchester | 2022 |
| Agecroft Properties (NO.2) Limited | Bristol | 2001 |
| Agedi UK Ltd | London | 2025 |
| Agegift Limited | London | 1990 |
| Ageis Ltd | Barry | 2025 |
| Ageli Ltd | London | 2020 |
| Agellus One Limited | Bury St. Edmunds | 2018 |
| Agellus Tuddenham Limited | Bury St. Edmunds | 2018 |
| Agen (London) Limited | London | 2016 |
| Agenais Limited | Banbury | 2018 |
| Agence France-Presse Limited | | 1990 |
| Agencies Holdings Limited | London | 2022 |
| Agency a Holdings Ltd | London | 2026 |
| Agency Accelerators Limited | London | 2011 |
| Agenda 21 Digital Holding Limited | London | 2015 |
| Agenda Marketing Holdings Limited | Bristol | 2018 |
| Agenda Resource Management Holdings Limited | Hull | 2023 |
| Agendas Group Limited | Bournemouth | 2020 |
| Agent PAY Ltd | London | 2025 |
| Agentic Asset & Advisory Ltd | Hythe | 2026 |
| Agentic Group Ltd | Hastings | 2026 |
| Agentic Risk Management Ltd | London | 2025 |
| Agentic Ventures Limited | Abergavenny | 2025 |
| Agentica Holdings Ltd | London | 2025 |
| Agentis Financial and Mortgage Solutions Limited | Peterborough | 2014 |
| Agentis Health Group Ltd | Brighton | 2020 |
| Agentis Technologies Ltd | Newbury | 2026 |
| Agentiv Ltd | Ilford | 2023 |
| Agents of Change (Scotland) Limited | Edinburgh | 2022 |
| Agents of Time- Financial Planning Ltd | Scunthorpe | 2019 |
| AGENTS4SPORTS Limited | London | 2026 |
| Agenzia Liguria Russia Ltd | London | 2011 |
| Ager Capital Partners Ltd | London | 2014 |
| Agero Capital Limited | London | 2024 |
| Agero Holdings Limited | London | 2023 |
| Ages AMS GP Ltd | London | 2025 |
| AGF Finance Limited | Stockport | 2011 |
| AGF Group Limited | Hartlepool | 2019 |
| AGF Property Holdings Ltd | Hove | 2025 |
| Agfa UK Group Pension Plan Trustee Limited | Reading | 2000 |
| Agfeac Limited | London | 2021 |
| Agfs Holding Limited | Wembley | 2017 |
| AGG Booth Title Limited | London | 2020 |
| AGG Group Ltd | Liverpool | 2020 |
| AGG Pro Ltd | Cambridge | 2019 |
| Agg-Pak Holdings Limited | Barnsley | 2021 |
| Aggancio Group Limited | London | 2016 |
| Aggarwal Group Ltd | Liverpool | 2024 |
| Aggb Mort Ltd | Billericay | 2023 |
| Aggelia Limited | Salisbury | 2018 |
| Aggi Christou Mortgages Ltd | Margate | 2022 |
| Aggie Holdings Limited | Wareham | 2024 |
| Aggleton Enterprises Ltd | Glasgow | 2021 |
| Aggrade Limited | Aylesbury | 2014 |
| Aggrecial Limited | London | 2003 |
| Aggrecycle Holdings Limited | Nuneaton | 2024 |
| Aggrecycle Limited | Nuneaton | 2023 |
| Aggregate Processing and Recycling (Holdings) Limited | Cambridge | 2012 |
| Aggregate Systems Group Holdings Limited | Wrotham | 2026 |
| Aggregated Finance Solutions Limited | Yeovil | 2021 |
| Aggregated Micro Power Holdings Limited | London | 2013 |
| Aggregator Holdco Limited | London | 2014 |
| Aggregator Vehicle PLC | London | 2014 |
| Aggreko Indonesia Finance Limited | Glasgow | 2018 |
| Aggreko IPP Solutions Development Limited | Cannock | 2024 |
| Aggreko IPP Solutions Europe Limited | Cannock | 2024 |
| Aggreko RAY SA Midco Limited | Cannock | 2024 |
| Aggreko Resalta Holdings Limited | Glasgow | 2023 |
| Aggreko Resalta Midco Limited | Cannock | 2025 |
| Aggybear Ltd | Blackpool | 2019 |
| AGH Financial Consultants Limited | Weybridge | 2008 |
| AGH Holdings Ltd | Rossendale | 2021 |
| Aghabridge (2020) Holdings Limited | Maidstone | 2020 |
| Aghabridge Group Account Limited | Maidstone | 2014 |
| Aghadaragh Holdings Ltd | Omagh | 2021 |
| Aghaverdiyev Ltd | London | 2026 |
| Aghh Ltd | Dungannon | 2017 |
| Aghlabeg Limited | Dungannon | 2023 |
| Aghoco 1256 Limited | Cheltenham | 2014 |
| Aghoco 1419 Limited | Leeds | 2016 |
| Aghoco 1438 Limited | Ipswich | 2016 |
| Aghoco 1507 Limited | Telford | 2017 |
| Aghoco 1709 Limited | Windermere | 2018 |
| Aghoco 1762 Limited | Leicestershire | 2018 |
| Aghoco 2081 Limited | Andover | 2021 |
| Aghoco 2082 Limited | Andover | 2021 |
| Aghoco 2083 Limited | Andover | 2021 |
| Aghoco 2214 Limited | Brough | 2022 |
| Aghoco 2288 Limited | London | 2023 |
| Aghoco 2341 Limited | London | 2025 |
| Aghoco 5029 Limited | Cheshire | 2025 |
| AGI Assets Ltd | Potters Bar | 2026 |
| AGI Investments NO1 Limited | London | 2024 |
| AGI Investments NO2 Limited | London | 2024 |