| AG OBS Holding Limited | London | 2025 |
| AG Offices Holdings Limited | London | 2024 |
| AG Optical Limited | Nottinghamshire | 2004 |
| AG Park Street Holdco Limited | London | 2025 |
| AG Park Street Limited | London | 2025 |
| AG Pbsa Vauxhall GP Limited | London | 2025 |
| AG Pbsa Vauxhall Holdco Limited | London | 2025 |
| AG Protect Ltd | London | 2026 |
| AG PS GP Limited | London | 2025 |
| AG Ramrous Holdings Ltd | Cambridge | 2024 |
| AG Refinery Ltd | Brierley Hill | 2026 |
| AG Security ALL Services Ltd | Corby | 2022 |
| AG Senior Executives Pension Trustee Limited | London | 1956 |
| AG Sunset Limited | Ilford | 2019 |
| AG UK Acquireco Ltd. | Bradford | 2016 |
| AG Venture Partners Ltd | London | 2024 |
| AG Ventures Limited | Buckingham | 2018 |
| Ag-Tech Holdings Ltd | Taunton | 2024 |
| AG29 Investments Ltd | London | 2021 |
| AG47 Limited | London | 2014 |
| AGA Asset Management Ltd | Harrow | 2020 |
| AGA Corporate Broking Limited | Bexleyheath | 2025 |
| AGA Holdings (SW) Limited | Tiverton | 2024 |
| AGA Holdings Ltd | Harrow | 2020 |
| AGA Solar Holdco Limited | London | 2024 |
| Aga-Rayburn Limited | Long Eaton | 2005 |
| Agadir Limited | Spondon | 2013 |
| Again Holdings Limited | South Hetton | 2025 |
| Against Breast Cancer Holdings Limited | Abingdon | 2024 |
| Against the Head Limited | Dundee | 2014 |
| Agalma Ltd | Kent | 2025 |
| Agalmic Ltd | Romsey | 2019 |
| Agalsi Holdings Limited | Portsmouth | 2024 |
| Agam Aujla Limited | Wolverhampton | 2025 |
| Agama & Associates Limited | Edwalton | 2015 |
| Agamemnon Holdings Limited | Belfast | 2023 |
| Agant (Scotland) Ltd | Stirling | 2023 |
| Agant Limited | Stirling | 2026 |
| Agapanthus Holdings Limited | Brierley Hill | 2017 |
| Agapanthus Ventures Ltd | London | 2025 |
| Agape Holding Ltd | Birmingham | 2023 |
| Agape Online Group Limited | Canterbury | 2024 |
| Agape Trading Group Limited | Bolton | 2025 |
| Agapeuk Ltd | Barnstaple | 2024 |
| Agar Interiors Holdings Limited | Wisbech | 2026 |
| Agarsen Capital Limited | Kings Langley | 2024 |
| Agarwals FIC Ltd | Birmingham | 2026 |
| Agass Holdings Ltd | Altrincham | 2020 |
| Agasthiya Consult Fintech (UK) Limited | Taunton | 2025 |
| Agastya Consulting Limited | Amersham | 2023 |
| Agatha Holdings Ltd | Bury St. Edmunds | 2026 |
| Agathe World Ltd | London | 2020 |
| Agathi Holdings Ltd | Glasgow | 2022 |
| Agathos One (GP) Limited | London | 2014 |
| Agatino Marine Services Ltd | London | 2015 |
| Agave Capital Management Limited | London | 2024 |
| Agave Holdings Limited | London | 2024 |
| AGB & Associates Limited | Chertsey | 2002 |
| AGB Property Finance Ltd | Chertsey | 2017 |
| Agbaje Sterling Capital Limited | London | 2025 |
| Agborichy.Com Limited | London | 2025 |
| AGC Business (UK) Limited | Stanmore | 2025 |
| AGC Global Limited | London | 2025 |
| AGC Holdings Ltd | Dunfermline | 2024 |
| AGC UK Holdings Ltd | Leicester | 2025 |
| Agca Holdings Ltd | London | 2026 |
| Agcap Limited | Cirencester | 2016 |
| Agco Finance Limited | Watford | 1990 |
| AGD & RS Holdings Limited | Oswestry | 2026 |
| AGD Commodities Ltd | London | 2026 |
| AGD Investment Management Limited | Leicester | 2021 |
| AGD Ltd | London | 2023 |
| Agdevco Holdings Limited | London | 2019 |
| Agdevco Limited | London | 2009 |
| Agdevco Ventures Limited | London | 2025 |
| AGE Assist Limited | Leeds | 2012 |
| AGE Concern Liverpool (Services) Limited | Liverpool | 1987 |
| AGE Concern Manchester Trading Co. Ltd | Manchester | 1994 |
| AGE Concern Morgannwg Trading Limited | Aberdare | 2000 |
| AGE Concern Solihull Trading Limited | Solihull | 1994 |
| AGE Concern Trading in Cheshire Limited | Northwich | 1995 |
| AGE Lifetime Limited | Leeds | 2015 |
| AGE Partnership Group Limited | Leeds | 2014 |
| AGE Partnership Limited | Leeds | 2004 |
| AGE Partnership Wealth Management Limited | Leeds | 2014 |
| AGE Refined Holdings Limited | Glasgow | 2025 |
| AGE Scotland Enterprises Limited | Edinburgh | 1999 |
| AGE UK Bedfordshire Trading Limited | Bedford | 2012 |
| AGE UK Devon Trading Limited | Exeter | 2012 |
| AGE UK East Sussex Trading Limited | Lewes | 1998 |
| AGE UK Lancashire Trading Ltd | Ormskirk | 2007 |
| AGE UK Manchester Trading Co. Limited | Manchester | 2009 |
| AGE UK Sunderland Services Limited | Sunderland | 1996 |
| AGE UK Wakefield Trading Limited | West Yorkshire | 1995 |
| AGE UK West Sussex Enterprises Limited | Brighton | 1998 |
| AGE UK York Enterprises Ltd | York | 2003 |
| Agean Trading UK Ltd | London | 2026 |
| Ageas (UK) Limited | Eastleigh | 1973 |
| Ageas Inshur Services Ltd | Nottingham | 2026 |
| Ageas Insurance Limited | Eastleigh | 1939 |