| AGE UK Local Trading Limited | Nottingham | 1995 |
| AGE UK Runnymede and Spelthorne | Godalming | 2008 |
| AGE UK Somerset Trading Ltd. | Taunton | 1999 |
| AGE UK Surrey (Trading) Limited | Godalming | 2001 |
| Agecare (Eastern) Limited | Harrogate | 2016 |
| Ageless Worldwide Co., Ltd. | London | 2024 |
| Agency 54 Ltd | Crawley | 2009 |
| Agency Construction Limited | Birmingham | 2018 |
| Agency Payroll Solutions Ltd | Calne | 2005 |
| Agencyserve Limited | York | 2023 |
| Agenda Five Limited | Hull | 2023 |
| Agendua Ltd | London | 2009 |
| Agent Labour Ltd | Bognor Regis | 2024 |
| Agent Ltd | London | 2002 |
| Agentica Limited | Newcastle Upon Tyne | 2024 |
| Ager Solutions Ltd | Haywards Heath | 2017 |
| Ages Limited | Glasgow | 2009 |
| Ageuk County Durham | Durham | 2010 |
| Ageuk County Durham Trading Limited | Durham | 2010 |
| AGF Davies Limited | Glasgow | 2022 |
| AGF UK Enterprises Ltd | Welwyn | 2024 |
| Agfhb Ltd. | Edinburgh | 2005 |
| Aggar Consulting Limited | Ipswich | 2018 |
| Aggpo Int'L Limited | Cardiff | 2016 |
| Aggreg&Te Consultancy Ltd | Maidenhead | 2021 |
| Aggregate Direct Limited | Birmingham | 1979 |
| Aggregate Industries Limited | Coalville | 2015 |
| Aggregate Industries Slas Limited | Coalville | 1994 |
| Aggregate Supplies Limited | Middlesex | 2005 |
| Aggregates Recycling Limited | Cambridge | 1969 |
| Aggroran Limited | London | 2025 |
| Aghaboy Aquaculture Limited | Antrim | 2012 |
| Aghatti Limited | London | 2018 |
| Aghavannan Limited | Aghalee | 2018 |
| Aghita Ltd | Manchester | 2022 |
| Aghoco 1472 Limited | Liverpool | 2016 |
| Aghoco 1491 Limited | Thornton Cleveleys | 2016 |
| Aghoco 1630 Limited | Altrincham | 2017 |
| Aghoco 1952 Limited | Sheffield | 2020 |
| Aghoco 2049 Limited | Reading | 2021 |
| Aghoco 2080 Limited | Andover | 2021 |
| Aghoco 2269 Limited | Manchester | 2023 |
| Aghoco 2311 Limited | Manchester | 2024 |
| Aghoco 2350 Limited | Manchester | 2025 |
| Aghoco 2352 Limited | Reading | 2025 |
| Aghoco 2375 Limited | Manchester | 2026 |
| Aghoco 2376 Limited | Manchester | 2026 |
| Aghoco 2377 Limited | Manchester | 2026 |
| Aghoco 2378 Limited | Manchester | 2026 |
| Aghoco 2379 Limited | Manchester | 2026 |
| Aghoco 2380 Limited | Manchester | 2026 |
| Aghoco 5015 Limited | Edinburgh | 2020 |
| Aghp Management Limited | Cardiff | 2021 |
| AGI Professionals Ltd | Basingstoke | 2014 |
| AGI Research Limited | Chalvington | 2011 |
| Agil Limited | Worksop | 2007 |
| Agile Accountants Limited | Birmingham | 2022 |
| Agile Business Systems Solutions Ltd | Bracknell | 2007 |
| Agile Elite Ltd | Reading | 2022 |
| Agile Financial Solutions Limited | Sheffield | 2018 |
| Agile for HR Ltd | Hampton | 2021 |
| Agile for International Services Limited | Manchester | 2026 |
| Agile Human Resources Ltd | Hampton | 2021 |
| Agile Pronunciation Teachers Ltd | Mansfield | 2020 |
| Agile World Associates Limited | Harrow | 2016 |
| Agileup Limited | Wednesbury | 2022 |
| Agilia Infrastructure Partners Trustee Limited | London | 2023 |
| Agilion Insurance Brokers Limited | Billericay | 2024 |
| Agilite Limited | London | 2011 |
| Agility Data Solutions Limited | Cirencester | 2012 |
| Agility Direct Ltd | Crewe | 2023 |
| Agility Fleet Limited | Nottingham | 2012 |
| Agis Engineering Ltd | Nottingham | 2024 |
| Agito Holdings Limited | Huntingdon | 2020 |
| Agivey Renewables Ltd | Armoy | 1992 |
| AGK Packaging Ltd | Leigh-On-Sea | 2023 |
| AGL Associates Ltd | Dudley | 2018 |
| AGL Global Ltd | Brentwood | 2014 |
| AGL Logistics Ltd | Airdrie | 2017 |
| Aglb Property Ltd | West Malling | 2024 |
| AGM Homes Limited | Greenock | 2016 |
| AGM Projects Limited | Greenock | 2016 |
| AGM Property Limited | Greenock | 2016 |
| Agman Cocoa Limited | London | 1976 |
| Agman's Limited | London | 2024 |
| Agmec Limited | | 1975 |
| Agmr Limited | Brentwood | 2016 |
| Agms Energy Ltd | Bedford | 2023 |
| Agne Engstrom Limited | London | 2014 |
| Agni Foods Limited | Sheffield | 2021 |
| Agnic Limited | Brighton | 2025 |
| Agogo's Garden Limited | Burley In Wharfedale | 2017 |
| Agora Business Consulting Limited | Birmingham | 2021 |
| Agora Midco 2 Limited | Sheffield | 2021 |
| Agora Midco Limited | Sheffield | 2021 |
| Agora Topco Limited | Sheffield | 2021 |
| Agoston Wines Limited | Guildford | 2016 |
| AGP (2) Limited | Swanley | 2001 |
| AGP Business Solutions Ltd | London | 1994 |
| AGP Management Limited | Whiteley | 2013 |