| Alabaster Studio Ltd | Manufacturing | 2023 |
| Aladdins Lamp Ltd | Real estate | 2022 |
| Alamillo Ltd | Professional & scientific | 2021 |
| Alan Blackfish Ltd | Information & communication | 2014 |
| Alan Matley (Properties) Limited | Hospitality | 2001 |
| Alana Kitchens Ltd | Construction | 2019 |
| Alara Studios Ltd | Information & communication | 2026 |
| Alas Motors Ltd | Wholesale & retail | 2026 |
| Albany Court II Limited | Households | 1981 |
| Albatross Conversions Ltd | Wholesale & retail | 2024 |
| Albert Waeschle Limited | Wholesale & retail | 1982 |
| Albi & US Ltd | Wholesale & retail | 2026 |
| Albion Botanicals Limited | Extraterritorial | 2012 |
| Albion Glass and Glazing Ltd | Construction | 2017 |
| Alborada Holdings Ltd | Information & communication | 2025 |
| Albubay View Limited | Professional & scientific | 2020 |
| Albury Hills Ltd | Administrative & support | 2022 |
| Alca Global Services Limited | Wholesale & retail | 2025 |
| Alcar Enterprise Ltd | Wholesale & retail | 2023 |
| Alcd Ltd | Financial services | 2023 |
| ALD 8 Limited | Construction | 2010 |
| ALD3 Limited | Construction | 2007 |
| Aldaray Ltd | Information & communication | 2009 |
| Alder Hills Barber Ltd | Other services | 2026 |
| Alder Payroll Services Limited | Professional & scientific | 2023 |
| Alderney Plating Limited | Manufacturing | 1986 |
| ALE Canteiro Digital Ltd | Information & communication | 2025 |
| ALE Tales Ltd | Financial services | 2025 |
| Alea Advisory Ltd | Administrative & support | 2025 |
| Alea Catering Ltd | Hospitality | 2022 |
| Alecstar Limited | Health & social care | 2016 |
| Aleftaf Consultancy Private Limited | Professional & scientific | 2023 |
| Aleksander Koziej Ltd | Transport & logistics | 2025 |
| Aleksandra Consulting Ltd | Information & communication | 2016 |
| Aletheia Intelligence Limited | Administrative & support | 2024 |
| Aleurones Limited | Other services | 2025 |
| Aleve International Ltd | Information & communication | 2024 |
| Alex Gale Automotive Ltd | Information & communication | 2025 |
| Alexander Lawrence Property Limited | Construction | 2018 |
| Alexandra Elizabeth Kaye Ltd | Extraterritorial | 2022 |
| Alexandria Developments Ltd | Construction | 2018 |
| Alexia Motor Yacht Charters LLP | | 2018 |
| Alexis Rose Ltd | Arts & recreation | 2024 |
| Alexrainbirdmusic Ltd | Information & communication | 2022 |
| Alfai Ltd | Information & communication | 2023 |
| Alfatronix (Holdings) Limited | Professional & scientific | 2006 |
| Alfera Ltd | Other services | 2024 |
| Alfredasa Ltd | Transport & logistics | 2018 |
| Alfresco Investments Holdings Limited | Financial services | 2022 |
| Alfresco Investments Limited | Wholesale & retail | 2018 |
| ALG Catering Limited | Hospitality | 2026 |
| Alharthi Group Company Limited | Wholesale & retail | 2025 |
| ALI Akbar Tatla Limited | Wholesale & retail | 2024 |
| ALI Ecom Enterprise Limited | Wholesale & retail | 2026 |
| ALI Hassan Ltd | Wholesale & retail | 2026 |
| Alicaster Limited | Administrative & support | 2016 |
| Alice Callow Film Ltd | Information & communication | 2026 |
| Alicraft Limited | Manufacturing | 2021 |
| Alidile Ltd | Real estate | 2018 |
| Align Global Limited | Professional & scientific | 2011 |
| Align Orthodontic Group Ltd | Health & social care | 2023 |
| Align Property Consultants Limited | Construction | 2007 |
| Aligned Syndicate Ltd | Financial services | 2025 |
| Alignixai Ltd | Information & communication | 2025 |
| Alington Limited | Hospitality | 2003 |
| Alipen Limited | Financial services | 2019 |
| Aliquantum Limited | Information & communication | 2012 |
| Aliroo Limited | Manufacturing | 2006 |
| Alishba Takeaway Limited | Hospitality | 2025 |
| Alison Britt Ltd | Professional & scientific | 2017 |
| Alison Sweeney Consultancy Services Ltd | Administrative & support | 2022 |
| Alive 81 Limited | Wholesale & retail | 2024 |
| Aliyevastorex Limited | Wholesale & retail | 2026 |
| Aljunaid Limited | Wholesale & retail | 2024 |
| Alkavie Limited | Wholesale & retail | 2025 |
| Alke Capital Partners Limited | Professional & scientific | 2019 |
| ALL Building Services Ltd | Construction | 2012 |
| ALL Flavours Vapes Ltd | Wholesale & retail | 2023 |
| ALL Glazing Solutions Limited | Construction | 2016 |
| ALL Hail ALE Limited | Hospitality | 2016 |
| ALL Kind Ltd | Wholesale & retail | 2025 |
| ALL Phase Contracting Group Ltd | Construction | 2025 |
| ALL Purpose Cake Co International Ltd. | Wholesale & retail | 2025 |
| ALL Rise Consulting Ltd | Information & communication | 2022 |
| ALL SME Ltd | Information & communication | 2021 |
| ALL Star Building Ltd | Construction | 2026 |
| ALL That's Bellissimo Ltd | Extraterritorial | 2015 |
| ALL Things Custom by J Ltd | Wholesale & retail | 2024 |
| ALL Wells and Good Limited | Professional & scientific | 2022 |
| ALL10TIC Ltd | Information & communication | 2026 |
| ALL2WHEELERS Limited | Wholesale & retail | 2014 |
| Alla's Dream Community Interest Company | Wholesale & retail | 2022 |
| Allaboutcareers Limited | Administrative & support | 2008 |
| Allaboutgrads Ltd | Administrative & support | 2017 |
| Allaboutgroup Holdings Ltd | Financial services | 2016 |
| Allaboutgroup Services Ltd | Administrative & support | 2017 |
| Allaboutschoolleavers Ltd | Administrative & support | 2017 |
| Allan (DOT) Ltd | Information & communication | 2026 |
| Allenbrook Care Limited. | Health & social care | 2004 |
| Allenby Court Developments Limited | Real estate | 2023 |