| ALL Round Contractors Ltd | Construction | 2024 |
| ALL Saints Care Limited | Health & social care | 2009 |
| ALL Seasons Properties Investment Ltd | Real estate | 2023 |
| ALL Seasons Removal & Storage Ltd | Transport & logistics | 2021 |
| ALL Seasons Roofing Group Ltd | Construction | 2014 |
| ALL Soft BD Limited | Information & communication | 2024 |
| ALL Star Recovery Ltd | Wholesale & retail | 2014 |
| ALL Stars Relocations Ltd | Transport & logistics | 2021 |
| ALL Stars UK Debtco Limited | Financial services | 2024 |
| ALL Supreme Logistics Limited | Transport & logistics | 2025 |
| ALL the Good Names ARE Taken Ltd | Professional & scientific | 2014 |
| ALL the Paws Ltd | Wholesale & retail | 2022 |
| ALL Trade Point Ltd | Wholesale & retail | 2017 |
| All-Purpose Property Ltd | Real estate | 2017 |
| Allaira Financial Advisory Ltd | Professional & scientific | 2025 |
| Allamagan MDM Trading Ltd | Hospitality | 2017 |
| Alldoorsuk.Com Ltd | Manufacturing | 2025 |
| Allenb Limited | Wholesale & retail | 2025 |
| Alley Marketing Consultancy (AMC) Ltd | Professional & scientific | 2013 |
| Alleyna PVT Limited | Transport & logistics | 2025 |
| Alliance Business Solutions Ltd | Information & communication | 2016 |
| Alliance in Property Limited | Households | 2020 |
| Alliance Solicitors Ltd | Professional & scientific | 2018 |
| Allied Brotherz Construction Ltd | Construction | 2026 |
| Allied Facilities (South East) Limited | Professional & scientific | 2000 |
| Allied Facilities Limited | Administrative & support | 1987 |
| Allied Halal Foods Limited | Wholesale & retail | 2017 |
| Allied Movers Ltd | Transport & logistics | 2025 |
| Allied Resource Ltd | Administrative & support | 2016 |
| Allinoni Limited | Wholesale & retail | 2026 |
| Allout Clean Ltd | Administrative & support | 2025 |
| Alloys Refurb Limited | Wholesale & retail | 2023 |
| Allprint Supplies Limited | Manufacturing | 1999 |
| Allpro Building Contractors Ltd | Construction | 2021 |
| Allround Building Services Limited | Construction | 2017 |
| Allround Storage Solutions Limited | Other services | 2019 |
| Allsafe Engineering Limited | Professional & scientific | 2018 |
| Allstar Uhlmann UK Ltd | Wholesale & retail | 2017 |
| Allthingsbrighttoys Ltd | Wholesale & retail | 2024 |
| Allthingshair Limited | Other services | 2024 |
| Alltrucks London Ltd | Wholesale & retail | 2022 |
| Allura Services Limited | Construction | 2017 |
| Allwaste (Berkshire) Limited | Water & waste | 2005 |
| ALM Rail Solutions UK Limited | Transport & logistics | 2019 |
| Alma Bridging Properties Ltd | Real estate | 2023 |
| Alma Supported Accommodation Ltd | Health & social care | 2019 |
| Almah Limited | Wholesale & retail | 2024 |
| Almahroosah Ltd | Wholesale & retail | 2025 |
| Almas Consulting Ltd | Professional & scientific | 2011 |
| Almasi House Limited | Wholesale & retail | 2024 |
| Almeida Logistics Ltd | Transport & logistics | 2014 |
| Almeida Plumbing Ltd | Construction | 2019 |
| ALN Security Ltd | Administrative & support | 2021 |
| Alnoor Foods Ltd | Hospitality | 2003 |
| Alpha AD Astra Ltd | Real estate | 2023 |
| Alpha Building Maintenance Limited | Construction | 2006 |
| Alpha Charlie Security Ltd | Financial services | 2024 |
| Alpha Construction (PVT) Ltd | Professional & scientific | 2013 |
| Alpha Consulting IT Limited | Information & communication | 2007 |
| Alpha Distribution (UK) Ltd | Wholesale & retail | 2014 |
| Alpha E-Business Ltd | Wholesale & retail | 2024 |
| Alpha Eco Tech Ltd | Construction | 2025 |
| Alpha Finative Ltd | Information & communication | 2021 |
| Alpha Global Logistics Ltd | Transport & logistics | 2009 |
| Alpha Medical Consultancy Limited | Health & social care | 2004 |
| Alpha Motors Trading Ltd | Wholesale & retail | 2024 |
| Alpha Network Supply Ltd | Information & communication | 2022 |
| Alpha Noir Ltd | Information & communication | 2023 |
| Alpha Transit Ltd | Transport & logistics | 2023 |
| Alphabeta Estates Ltd | Real estate | 2024 |
| Alpharoute Sevices Ltd | Transport & logistics | 2024 |
| Alpharumi Ltd | Wholesale & retail | 2025 |
| Alphastock Ltd | Real estate | 2013 |
| Alphatec Ltd | Construction | 2024 |
| Alphatech Designz Ltd | Information & communication | 2026 |
| Alphega Riskmatrix Solutions Ltd | Information & communication | 2026 |
| Alpial Brother Ltd | Transport & logistics | 2025 |
| Alpine Flips Ltd | Real estate | 2025 |
| Alrehab Services Ltd | Administrative & support | 2025 |
| Alrich Group Limited | Hospitality | 2019 |
| Alrich Luxe Interiors Ltd | Real estate | 2015 |
| ALS Lock Tools Ltd | Manufacturing | 2022 |
| Alshaheer Halal Foods (PVT) Ltd | Hospitality | 2014 |
| Alsl Tech Limited | Information & communication | 2018 |
| Altaforma Limited | Professional & scientific | 2025 |
| Altai Ltd | Wholesale & retail | 2025 |
| Alter Construction Limited | Construction | 2014 |
| Altfood Ltd | Wholesale & retail | 2025 |
| Althea Private Limited | Health & social care | 2025 |
| Althea Wade Ltd | Information & communication | 2014 |
| Altitude Solutions Ltd | Administrative & support | 2022 |
| Altom Transport Limited | Transport & logistics | 2014 |
| Altonville Properties Limited | Administrative & support | 2007 |
| Altray Consultancy Ltd | Professional & scientific | 2016 |
| Always Rise Enterprises Limited | Real estate | 2025 |
| Alx.Execonstruct Ltd | Construction | 2024 |
| Alyawm Ltd | Wholesale & retail | 2021 |
| Alza International Ltd | Administrative & support | 2018 |
| Alzene Ltd | Transport & logistics | 2016 |
| AM Auto Zone Ltd | Wholesale & retail | 2024 |