| Albion Prime Development Limited | Construction | 2021 |
| Albright Electrical Solutions Ltd | Construction | 2025 |
| Albright Estates Ltd | Real estate | 2021 |
| Albright Solutions Ltd | Construction | 2025 |
| Albright Tots Ltd | Health & social care | 2026 |
| Albz Limited | Real estate | 2026 |
| Alchemic Coach Ltd | Information & communication | 2018 |
| Alder & Carter Limited | Professional & scientific | 2018 |
| Aldervale Capital Limited | Wholesale & retail | 2019 |
| Aldsol Limited | Professional & scientific | 2021 |
| Alesso Law Limited | Professional & scientific | 2026 |
| Alex Eco Builders Ltd | Construction | 2018 |
| Alexa Horizon Ltd | Manufacturing | 2023 |
| Alexander & Sharp Properties Limited | Real estate | 2026 |
| Alexandra 44 Ltd | Real estate | 2025 |
| Alexandra Flats Ltd | Real estate | 2023 |
| Alexiskattys Kitchen Ltd | Hospitality | 2024 |
| Alferra Ltd | Households | 2025 |
| Alfresco by Design Ltd | Financial services | 2020 |
| Alfreton Estate Company Limited | Other services | 2018 |
| Alfreton Estate Company NO.2 Limited | Other services | 2018 |
| Alfreton Hall Events Ltd | Hospitality | 2024 |
| ALH Developments Ltd | Real estate | 2026 |
| ALI Ellam Productions Ltd | Information & communication | 2015 |
| ALI Salford Ltd | Hospitality | 2026 |
| ALI Therapy Ltd | Health & social care | 2023 |
| Ali's Kebab and Grill House Ltd | Hospitality | 2018 |
| Alice Casey Clarke Ltd | Professional & scientific | 2023 |
| Alili Limited | Wholesale & retail | 2024 |
| Alina Matiullah JAN Ltd | Professional & scientific | 2025 |
| Aliya Youth Manchester Ltd | Other services | 2022 |
| Aliyaqaiser Productions Ltd | Information & communication | 2014 |
| ALL Around the World Music Limited | Arts & recreation | 1991 |
| ALL Around the World Publishing Limited | Information & communication | 2003 |
| ALL for Baby Ltd | Wholesale & retail | 2025 |
| ALL Most Limited | Manufacturing | 2019 |
| ALL of OUR Company Limited | Wholesale & retail | 2019 |
| ALL Weather Roofing Solutions Ltd | Construction | 2025 |
| Allcarbitz Ltd | Wholesale & retail | 2026 |
| Allgoodsarenauk Ltd | Wholesale & retail | 2024 |
| Alliance Technologies Ltd | Construction | 2015 |
| Allied Construction Holdings Limited | Professional & scientific | 2005 |
| Allied Consultancy Ltd | Professional & scientific | 2019 |
| Allied Industrial Products Limited | Manufacturing | 1986 |
| Allied Logistics and Warehousing Limited | Extraterritorial | 2021 |
| Alloyrefurbsalford Ltd | Wholesale & retail | 2025 |
| Allplan UK Limited | Other services | 2017 |
| Allstar Property Solutions Limited | Real estate | 2018 |
| Allweis and Co Ltd | Professional & scientific | 2023 |
| Alma Estates Ltd | Extraterritorial | 2017 |
| Almagell Limited | Extraterritorial | 2015 |
| Almat Limited | Health & social care | 1980 |
| Almazey Ltd | Other services | 2021 |
| Almex Estates MB Limited | Real estate | 2023 |
| Almond Holdings Limited | Administrative & support | 2018 |
| Almond Nursing Limited | Wholesale & retail | 2021 |
| Alnabwi Limited | Financial services | 2026 |
| Alnk Ltd | Information & communication | 2023 |
| Alodent Ltd | Wholesale & retail | 2017 |
| Alpha Clinical Developments Limited | Professional & scientific | 2012 |
| Alpha Group Estates Limited | Other services | 2023 |
| Alpha Ward Properties Ltd | Real estate | 2020 |
| ALQ Trading Ltd | Hospitality | 2025 |
| Alqua Sports Limited | Wholesale & retail | 2023 |
| Alresford Systems Ltd | Information & communication | 2026 |
| Alshloul Ltd | Transport & logistics | 2025 |
| ALT Distribution Ltd | Wholesale & retail | 2019 |
| Altair 1965 Limited | Extraterritorial | 2014 |
| Altcom 407 Limited | Construction | 2006 |
| Altogether NOW Community Hall CIC | Health & social care | 2023 |
| Altoria Properties Ltd | Real estate | 2022 |
| Altpin Ltd | Professional & scientific | 2020 |
| Altrincham Paradise Nails Ltd | Other services | 2025 |
| Aluck Ltd | Hospitality | 2023 |
| Alysha Jessica Limited | Professional & scientific | 2023 |
| AM Building NW Ltd | Construction | 2020 |
| AM Change Consulting Ltd | Professional & scientific | 2019 |
| AM Machinery Services Ltd | Manufacturing | 2025 |
| AM Malik Enterprises Ltd | Wholesale & retail | 2016 |
| AM9 Autocentre Ltd | Wholesale & retail | 2025 |
| Amac Traffic Management Limited | Other services | 2016 |
| Amado Enterprise Limited | Wholesale & retail | 2025 |
| Amanda Presha Ltd | Extraterritorial | 2015 |
| Amari MCR Limited | Real estate | 2018 |
| Amazen Properties Limited | Real estate | 2025 |
| Amberdeal Limited | Wholesale & retail | 1986 |
| Amberley Evenington Estates Limited | Other services | 2025 |
| Amberwood Way Management Company Limited | Households | 2025 |
| Ambient Stays Ltd | Hospitality | 2019 |
| Amblemead Limited | Wholesale & retail | 1988 |
| Ambrose Cleaning Group LLP | | 2025 |
| Ameloblast Ltd | Health & social care | 2024 |
| American and Speciality Auto Parts Limited | Wholesale & retail | 1993 |
| American Cars Online Ltd | Wholesale & retail | 2019 |
| Amerisur Resources Limited | Mining & quarrying | 2000 |
| AMG VIP Consultancy and Events Ltd | Hospitality | 2018 |
| AMI Community AID | Health & social care | 2014 |
| Amia Properties Limited | Real estate | 2024 |
| Amigo Barber Company Ltd | Other services | 2024 |
| Amigos Worldwide Sport Consultant Limited | Arts & recreation | 2010 |