| Archean Holdings Ltd | London | 2025 |
| Arched Holdings Limited | Derby | 2020 |
| Archel Group Limited | London | 2026 |
| Archenfield Insurance Management Limited | London | 2001 |
| Archenon Ltd | London | 2022 |
| Archer Asset & Capital Management Ltd | Plymouth | 2021 |
| Archer Bidco Limited | Hemel Hempstead | 2019 |
| Archer Daniels Asset Management Limited | London | 2019 |
| Archer Daniels Initial Limited Partner Limited | London | 2020 |
| Archer Daniels Securities Ltd. | London | 1996 |
| Archer Family Limited | Witney | 2021 |
| Archer Insurance Services Limited | Ruislip | 1991 |
| Archer John Unlimited | London | 2025 |
| Archer Joy Financial Planning Limited | Linlithgow | 2026 |
| Archer Midco Limited | Hemel Hempstead | 2019 |
| Archer Mortgages Ltd | London | 2024 |
| Archer Windows Holdings Limited | Colchester | 2024 |
| Archer's Mark Holdings Limited | London | 2017 |
| Archerdale Group EOT Limited | Shipley | 2024 |
| Archerfield Homes Holdings Limited | Peterborough | 2022 |
| Archers Avenue Limited | St. Helens | 2025 |
| Archers Financial Services Limited | Enfield | 2014 |
| Archers Holdings Limited | Tamworth | 2023 |
| Archers Sleepcentre (Holdings) Ltd | Glasgow | 2021 |
| Archery Investments Ltd | London | 2023 |
| Arches Group Ltd | Rugby | 2026 |
| Arches Holdings Limited | East Finchley | 2016 |
| Archetype Financial Services Ltd | Selby | 2017 |
| Archgate Wealth Ltd | Canterbury | 2025 |
| Archgold Investments Ltd | Wellington | 2005 |
| Archi-Made Ltd | London | 2026 |
| Archibald Macinnes and Company Limited | Motherwell | 1956 |
| Archibald Marckay Group Ltd | Hereford | 2018 |
| Archie John Financial Solutions Ltd | Cheadle | 2018 |
| Archie John Ltd | Cheadle Hulme | 2011 |
| Archie Murray Holdings Limited | Milnathort | 2020 |
| Archie's Holdings Ltd | Manchester | 2026 |
| Archie.Pi Ltd | Milton Keynes | 2023 |
| Archiedale Ltd | Manchester | 2022 |
| Archiedora Holdings Ltd | Preston | 2021 |
| Archieg Capital Limited | Weybridge | 2025 |
| Archigrow International Limited | London | 2024 |
| Archimed Advisors Ltd | London | 2025 |
| Archimedes Holdings Limited | London | 2023 |
| Archimedes Investments Ltd | London | 2021 |
| Archimedes Partners Limited | Grantham | 2012 |
| Archimedes Partners Trustees Limited | London | 2012 |
| Archimedes Securities Limited | London | 2025 |
| Archimedes SP Holdings Limited | Bromley | 2021 |
| Archipelago Capital Limited | Plymouth | 2023 |
| Archipelago Circular Economy GP Limited | London | 2024 |
| Archipelago Circular Economy LP1 Limited | London | 2024 |
| Archipelago Eco Investors Holdings Ltd | London | 2022 |
| Archipelago Eco Investors Ltd | London | 2019 |
| Archipelago One Ltd | London | 2012 |
| Archipelago Sands Ltd | Cambridge | 2020 |
| Archiq Limited | Pontefract | 2025 |
| Archishil Holdings Ltd | Ilford | 2025 |
| Archit Holdings Ltd | Bath | 2015 |
| Archital Holdings Limited | Telford | 2022 |
| Architas Limited | London | 1991 |
| Architectural Heritage Fund(The) | London | 1973 |
| Architectural Systems Limited | Leeds | 2003 |
| Architecture Construction Engineer Group Ltd | London | 2018 |
| Architen Landrell Group Limited | Chepstow | 2019 |
| Archival Investments Limited | Burton Upon Trent | 2024 |
| Archive Bidco Limited | Bristol | 2017 |
| Archive Innovation Limited | Witney | 2021 |
| Archive Labs Ltd | London | 2024 |
| Archive Midco Limited | Bristol | 2017 |
| Archive Pensions Limited | Knowle, Solihull | 2001 |
| Archive Topco Limited | Bristol | 2017 |
| Archkabe Ltd | Newport | 2025 |
| Archmagic Limited | Wallington | 1987 |
| Archmont Advisers Ltd | London | 2024 |
| Archmore Emerald Ltd | London | 2020 |
| Archmore Infrastructure Holdings Ltd | London | 2019 |
| Archoldingsuk Limited | Nottingham | 2024 |
| Archon Holdings Limited | Worthing | 2026 |
| Archon Investments Limited | Haslemere | 2022 |
| Archopal Ltd | Plymouth | 2023 |
| Archover Limited | London | 2010 |
| Archrise Holdings Limited | Newcastle Upon Tyne | 2020 |
| Archroma UK, Ltd | London | 2013 |
| Archrose Wealth Management Limited | Hull | 2026 |
| Archsmartbusiness Holding Limited | Solihull | 2020 |
| Archstone Labs Ltd | London | 2026 |
| Archway Assistance Limited | Altrincham | 2025 |
| Archway Capital Partners Limited | Weybridge | 2020 |
| Archway Capital Ventures Limited | Edgware | 2026 |
| Archway Commercial Limited | London | 2017 |
| Archway Finance Ltd | London | 2024 |
| Archway Group Holdings Ltd | Rochdale | 2024 |
| Archway Holdings & Investments Ltd | London | 2026 |
| Archway Holdings Ltd | Chester | 2016 |
| Archway Investments MCR Ltd | Manchester | 2024 |
| Archway Residential Limited | London | 2017 |
| Archway Strategic Holdings Ltd | Edgware | 2026 |
| Archytas Commercial Finance Ltd | Clitheroe | 2017 |
| Archytas Corporate Planning Ltd | Cardiff | 2018 |