| Alawihubuk Limited | Financial services | 2026 |
| Albalaw Limited | Professional & scientific | 2022 |
| Albara Ltd | Manufacturing | 2024 |
| Alber Investments Ltd | Financial services | 2024 |
| Alber Properties Ltd | Real estate | 2024 |
| Albern Eding Ltd | Wholesale & retail | 2023 |
| Albert Mortensen Shipbrokers Ltd | Transport & logistics | 2020 |
| Albert Stanley Ltd | Professional & scientific | 2020 |
| Albion (Thetford) 2026 Ltd | Hospitality | 2026 |
| Albos Media Limited | Information & communication | 2026 |
| Alcantara Neiva Ltd | Financial services | 2025 |
| Alchemie Materials Limited | Manufacturing | 2002 |
| Alchemy Personal Training Ltd | Health & social care | 2021 |
| Alchemy Skateboards Ltd | Wholesale & retail | 2025 |
| Alcohol & Drug Testing Services Ltd | Other services | 2025 |
| Alderamin Solutions Ltd | Information & communication | 2025 |
| Alderbrook Partners Ltd | Professional & scientific | 2026 |
| Aldous Advisory Ltd | Professional & scientific | 2025 |
| Aldous Coaching Ltd | Professional & scientific | 2020 |
| Alecia's Study Space Ltd | Education | 2025 |
| Alegria Capital Partners LLP | | 2023 |
| Alema Roastery Limited | Wholesale & retail | 2025 |
| Alemacoffee Ltd | Manufacturing | 2022 |
| Alemdar Ltd | Information & communication | 2026 |
| Alera Health Ltd | Health & social care | 2026 |
| Alera Ltd | Wholesale & retail | 2025 |
| Alesia Media Ltd | Professional & scientific | 2025 |
| Alesphym Ltd. | Wholesale & retail | 2023 |
| Alevenio Ltd | Information & communication | 2025 |
| Alex Cullum Limited | Education | 2023 |
| Alex Hazelwood Ltd | Wholesale & retail | 2018 |
| Alexander Renewables Ltd | Energy | 2025 |
| Alexarciab Content Ltd | Arts & recreation | 2024 |
| Alfalah AI Ltd | Information & communication | 2025 |
| Alfray Glyne Ltd | Professional & scientific | 2024 |
| Alfrech Scent Ltd | Wholesale & retail | 2020 |
| ALG Innovations Limited | Administrative & support | 2017 |
| Algernon Limited | Information & communication | 2025 |
| Algonexis Tech Ltd | Information & communication | 2026 |
| ALI9NED Ltd | Manufacturing | 2025 |
| Alia Terra Ltd | Information & communication | 2023 |
| Alice Backham Limited | Information & communication | 2023 |
| Alice Estates Limited | Real estate | 2002 |
| Alice in the Garden Limited | Information & communication | 2025 |
| Aligato Lily Clays Ltd | Wholesale & retail | 2019 |
| Align and Shine Ltd | Education | 2025 |
| Aligned Collective Limited | Professional & scientific | 2022 |
| Alikko Limited | Wholesale & retail | 2025 |
| Alios-Pes Ltd | Professional & scientific | 2025 |
| Alisa Dumi RAI Ltd | Manufacturing | 2025 |
| Alistaire Jama Leadership & Management Training Ltd | Education | 2026 |
| Alkemy Distillery Ltd. | Manufacturing | 2021 |
| ALL 4 JS Ltd | Construction | 2026 |
| ALL Aircon Limited | Construction | 2025 |
| ALL Aspects Plumbing Solutions Limited | Construction | 2008 |
| ALL Brickwork Limited | Construction | 2015 |
| ALL Checked Hosting Limited | Other services | 2021 |
| ALL Day Cars Ltd | Wholesale & retail | 2021 |
| ALL Day Motors Ltd | Wholesale & retail | 2021 |
| ALL FIX Central Ltd | Construction | 2024 |
| ALL Floorings Direct Ltd | Construction | 2025 |
| ALL Foods Restaurant Ltd | Hospitality | 2019 |
| ALL Homes Limited | Real estate | 2002 |
| ALL in School Ltd | Information & communication | 2025 |
| ALL Living Natural Supplies Limited | Wholesale & retail | 2025 |
| ALL Ocean Ltd | Wholesale & retail | 2025 |
| ALL of the Humans Limited | Information & communication | 2024 |
| ALL Over Beauty Bury ST Edmunds Ltd | Other services | 2026 |
| ALL Over Productions Limited | Professional & scientific | 2024 |
| ALL Roofing and Building Services Ltd | Construction | 2026 |
| ALL Seasons Fencing Limited | Construction | 2006 |
| ALL Star Telecom Limited | Information & communication | 2007 |
| ALL TOO Social Ltd | Professional & scientific | 2025 |
| ALL World Products Ltd | Manufacturing | 2019 |
| ALL YOU CAN Sea Ltd | Wholesale & retail | 2025 |
| All-In Hypnosis Ltd | Extraterritorial | 2022 |
| Allan Fade Barbers Ltd | Other services | 2025 |
| Allcarto Ltd | Wholesale & retail | 2026 |
| Allco Trading Ltd | Wholesale & retail | 2021 |
| Allegra Health Limited | Health & social care | 2017 |
| Allen Contractors Limited | Construction | 2019 |
| Alliance Glow Ltd | Wholesale & retail | 2026 |
| Alliance Security Solutions Limited | Administrative & support | 2025 |
| Allium Foods Ltd | Agriculture & fishing | 2001 |
| Allmart Supplies Ltd | Wholesale & retail | 2007 |
| Allotment Store Ltd | Wholesale & retail | 2020 |
| Allreid Holdings Limited | Financial services | 2026 |
| Allreid Property Group Limited | Real estate | 2026 |
| Allspeed UK Limited | Manufacturing | 1999 |
| Allt Environmental Ltd | Professional & scientific | 2020 |
| Alltank Limited | Wholesale & retail | 2024 |
| Allteck Ltd | Information & communication | 2024 |
| Alltime Alarm Solutions Ltd | Administrative & support | 2010 |
| Allure Property (Exeter) Ltd | Hospitality | 2018 |
| Allure Property (Plymouth) Ltd | Hospitality | 2018 |
| Allure Property Ltd | Construction | 2017 |
| Allvixo Ltd | Wholesale & retail | 2026 |
| Alma&Kg Ltd | Wholesale & retail | 2025 |
| Almami Limited | Hospitality | 2020 |
| Almareach Ltd | Information & communication | 2026 |