| Alandi Limited | Financial services | 2018 |
| Alarbi Pharmaceuticals Ltd | Wholesale & retail | 2022 |
| Albaicin Ltd | Health & social care | 2025 |
| Albany BC Ltd | Professional & scientific | 2014 |
| Albany Construction (Yorkshire) Limited | Real estate | 2008 |
| Albany Developments (Glasgow) Limited | Real estate | 2023 |
| Albany Investments (Yorkshire) Limited | Professional & scientific | 2016 |
| Albers Construction Ltd | Construction | 2025 |
| Albers Traders Ltd | Wholesale & retail | 2024 |
| Albert Property Group Ltd | Real estate | 2024 |
| Alcemi Storage Developments 3 Limited | Energy | 2019 |
| Alcemi Storage Developments 4 Limited | Energy | 2019 |
| Alcemi Storage Developments 6 Limited | Energy | 2022 |
| Alco Line M.G Ltd | Construction | 2023 |
| Aldam Chase Property Management Company Limited | Real estate | 2012 |
| Alderson Catering Equipment (UK) Limited | Professional & scientific | 1984 |
| Alderson Electrical Ltd | Construction | 2010 |
| ALE Radu Mortgage Associates Ltd | Financial services | 2020 |
| Aleema Pharm Ltd | Wholesale & retail | 2021 |
| Alex & Myna Courier Ltd | Transport & logistics | 2019 |
| Alex Christopher Investments Limited | Real estate | 2014 |
| Alex Courier Limited | Transport & logistics | 2020 |
| Alex Fashion Ltd | Wholesale & retail | 2023 |
| Alex HGV Ltd | Transport & logistics | 2024 |
| Alex K Ltd | Water & waste | 2018 |
| Alex N Drivers Limited | Transport & logistics | 2025 |
| Alex Rodin TV Services Ltd | Information & communication | 2023 |
| Alex Woods Online Coach Ltd | Arts & recreation | 2022 |
| Alexandra Centre Management Company Limited | Households | 1992 |
| Alexandra Trans Ltd | Transport & logistics | 2022 |
| Alexisreedltd Ltd | Information & communication | 2024 |
| Alfie Little Kitchen Ltd | Hospitality | 2022 |
| Alford Business Properties Ltd | Real estate | 2021 |
| Alford Business Services Ltd | Manufacturing | 2019 |
| ALG Drywall Ltd | Construction | 2025 |
| Algonest Private Limited | Information & communication | 2024 |
| Alhussain Group Investments UK Ltd | Real estate | 2021 |
| Alhussain Group UK Ltd | Professional & scientific | 2021 |
| ALI and Co Logistics Limited | Transport & logistics | 2024 |
| ALI Aslam Ltd | Professional & scientific | 2017 |
| Aliam & SON Property Ltd | Real estate | 2022 |
| Alicia Construction Ltd | Construction | 2019 |
| Aliciabarlow Limited | Transport & logistics | 2025 |
| Align Holdings Limited | Financial services | 2024 |
| Align Management Services Limited | Construction | 2022 |
| Alin Alina Ltd | Hospitality | 2020 |
| ALIN500 Ltd | Transport & logistics | 2019 |
| Alina Beauty & Fashion Ltd | Other services | 2016 |
| Aliqon Limited | Wholesale & retail | 2025 |
| Alisha Developments Limited | Real estate | 2021 |
| Aliyanaa Ltd | Health & social care | 2025 |
| Ali’S Doncaster Ltd Ltd | Hospitality | 2025 |
| ALJ Group Properties Ltd | Real estate | 2022 |
| Alkar Transport 2 Ltd | Transport & logistics | 2026 |
| Alkent Technical Ltd | Arts & recreation | 2023 |
| ALL 2 Cover Ltd | Wholesale & retail | 2025 |
| ALL 4 Security Ltd | Administrative & support | 2023 |
| ALL About U Ltd | Health & social care | 2014 |
| ALL Aspects Interiors Ltd | Construction | 2018 |
| ALL Aspects Joinery and Heating Ltd | Construction | 2023 |
| ALL Branded Workwear Limited | Manufacturing | 2020 |
| ALL for Tots Ltd | Education | 2025 |
| ALL Four for One Ltd | Health & social care | 2018 |
| ALL Inns Ltd | Hospitality | 2023 |
| ALL My Trips Ltd | Transport & logistics | 2026 |
| ALL Roads Tyres Limited | Wholesale & retail | 2008 |
| ALL Safe Scaffolding and Safety Netting Ltd | Construction | 2025 |
| ALL Steel Bending Limited | Manufacturing | 2017 |
| ALL Things Learning Ltd | Health & social care | 2010 |
| ALL Time Creations Limited | Wholesale & retail | 2025 |
| ALL Type Motors Ltd | Wholesale & retail | 2022 |
| All-About O.T. Ltd | Health & social care | 2012 |
| Allagefitness Limited | Education | 2016 |
| Allbit Ltd | Wholesale & retail | 2013 |
| Allen Chipunza Limited | Health & social care | 2014 |
| Allen Engineering (Rotherham) Limited | Manufacturing | 2003 |
| Allendale & Co Ltd | Real estate | 2026 |
| Allgas 1 Limited | Construction | 2010 |
| Alliance Primary Care Limited | Health & social care | 2019 |
| Alliance Racing Limited | Manufacturing | 2020 |
| Allied Credit Limited | Financial services | 1998 |
| Allstar Engineering Ltd | Professional & scientific | 2020 |
| Allugato Streetwear Ltd | Wholesale & retail | 2022 |
| Allure Real Estate Limited | Real estate | 2021 |
| Allure Staffing Solutions Limited | Health & social care | 2016 |
| Allways Freight Forwarding Ltd | Transport & logistics | 2017 |
| Allwood Property Solutions Ltd | Real estate | 2026 |
| Almadina Rotherham Ltd | Wholesale & retail | 2026 |
| Almco Ltd | Administrative & support | 2021 |
| Almost Famous Limited | Extraterritorial | 2002 |
| Alnaiym Ltd | Wholesale & retail | 2025 |
| ALO Developments Limited | Real estate | 2025 |
| Alpenbury Enterprises Limited | Wholesale & retail | 2023 |
| Alpenbury Group Limited | Financial services | 2023 |
| Alpenbury Precision Engineering Limited | Manufacturing | 2007 |
| Alpha Bridge Ltd | Hospitality | 2026 |
| Alpha Fencing (Yorkshire) Ltd | Manufacturing | 2019 |
| Alpha Fire Limited | Construction | 2021 |
| Alpha Fit Ltd | Arts & recreation | 2025 |
| Alpha Machine Knife Company Limited | Manufacturing | 2011 |