| AL4HAIR Limited | Other services | 2024 |
| ALA Marketing Ltd | Arts & recreation | 2025 |
| ALA Trades Ltd | Wholesale & retail | 2023 |
| Alabboud Barbering Ltd | Other services | 2025 |
| Aladdins Cave Leeds Ltd | Wholesale & retail | 2020 |
| Alai Ventures Ltd | Hospitality | 2026 |
| Alake Consulting Limited | Information & communication | 2014 |
| Alam Transport Limited | Transport & logistics | 2014 |
| Alamo Design Limited | Professional & scientific | 2015 |
| Alan and Co Trading Limited | Wholesale & retail | 2016 |
| Alan Beattie (Leeds) Limited | Other services | 1999 |
| Alan Bush (Engineering Services) Limited | Manufacturing | 1986 |
| Alan Bush (Holdings) Limited | Professional & scientific | 2000 |
| Alan Carnel Glass & Glazing Ltd | Extraterritorial | 2005 |
| Alan Cooke Estate Agents (Meanwood) Limited | Real estate | 2012 |
| Alan Cooke Estate Agents Limited | Real estate | 2008 |
| Alan Kenyon Ltd | Other services | 2024 |
| Alan Michael Salter Limited | Health & social care | 2023 |
| Alan Paling Limited | Information & communication | 2009 |
| Alan Smith Enterprises Limited | Arts & recreation | 2002 |
| Alan Strike Developments Ltd | Construction | 2018 |
| Alanas UK Food Ltd | Wholesale & retail | 2021 |
| Aland (Leeds) Ltd | Wholesale & retail | 2019 |
| Aland H & a Limited | Other services | 2018 |
| Alanda Cleaning Services Ltd | Other services | 2017 |
| Alandale Assets Ltd | Real estate | 2025 |
| Alani Estate Ltd | Real estate | 2024 |
| Alani Investments Ltd | Real estate | 2025 |
| Alara Therapy Ltd | Other services | 2025 |
| Alast Exteriors Limited | Construction | 2006 |
| Alawasports Ltd | Arts & recreation | 2022 |
| Alaya Enterprises 2 Ltd | Hospitality | 2025 |
| Alaya Enterprises Limited | Hospitality | 2021 |
| Alayance Ltd | Wholesale & retail | 2024 |
| ALB Legal Services Limited | Professional & scientific | 2014 |
| ALB Roofing & Cladding Ltd | Construction | 2022 |
| ALB Ventures Ltd | Professional & scientific | 2023 |
| Albarex Ltd | Construction | 2024 |
| Albazi Medical Services Limited | Health & social care | 2024 |
| Albbarros Limited | Financial services | 2025 |
| Albermarle Investments Limited | Real estate | 2003 |
| Alberoy Ltd | Wholesale & retail | 2026 |
| Albert & Co Ltd | Health & social care | 2014 |
| Albert House RTM Company Limited | Households | 2022 |
| Albert Innes Group Ltd | Financial services | 2018 |
| Albert Innes Limited | Construction | 1939 |
| Albert Mill Properties Limited | Financial services | 2013 |
| Albert Retail Limited | Wholesale & retail | 2025 |
| Albert Road Consulting Limited | Professional & scientific | 2017 |
| Albert Yeadon Ltd | Hospitality | 2021 |
| Alberton Investments Limited | Financial services | 2024 |
| Albiatty Ltd | Real estate | 2023 |
| Albina’S Kitchen Ltd | Hospitality | 2023 |
| Albion and Rose Ltd | Real estate | 2023 |
| Albion Fabrications Limited | Construction | 2018 |
| Albion Glass Leeds Ltd | Construction | 2019 |
| Albion INK Ltd | Other services | 2023 |
| Albion Intelligence Ltd | Information & communication | 2024 |
| Albion Jones Limited | Construction | 1990 |
| Albion Search Limited | Administrative & support | 2024 |
| Albion Services Ltd | Administrative & support | 2020 |
| Albury Properties Limited | Construction | 1962 |
| Albus Property Ltd | Real estate | 2026 |
| Alcach Ltd | Hospitality | 2018 |
| Alcatraz Storage Limited | Information & communication | 2000 |
| Alchemicvibe Ltd | Professional & scientific | 2021 |
| Alchemie IP Limited | Professional & scientific | 2007 |
| Alchemist Aesthetics Birmingham Limited | Other services | 2024 |
| Alchemist Technologies Ltd | Manufacturing | 2022 |
| Alchemist Ventures and Consultancy Services Ltd | Professional & scientific | 2017 |
| Alchemy App Wellness Ltd | Arts & recreation | 2021 |
| Alchemy Change Consulting Ltd | Professional & scientific | 2012 |
| Alchemy Consulting Services Limited | Professional & scientific | 2025 |
| Alchemy Leeds Ltd | Hospitality | 2016 |
| Alchorne Ltd | Health & social care | 2022 |
| Alchymir Ltd | Information & communication | 2024 |
| ALD Race Engines & Heads Ltd | Manufacturing | 2023 |
| Aldacorp Limited | Health & social care | 2014 |
| Aldan Services Limited | Education | 2024 |
| Aldar Cafe Limited | Transport & logistics | 2020 |
| Aldburgh Estate Company Limited | Extraterritorial | 2018 |
| Alderburgh Limited | Wholesale & retail | 1980 |
| Alderly Edge SK Convenience Ltd | Wholesale & retail | 2024 |
| Alderson Auto's Limited | Wholesale & retail | 2014 |
| Aldo Construction Limited | Construction | 2024 |
| Aldona Electrical Ltd | Information & communication | 2011 |
| Aldran Group Ltd | Information & communication | 2025 |
| Aldreds Limited | Health & social care | 2003 |
| Aldrick Property Ltd | Real estate | 2020 |
| Aldro Eastbourne Limited | Construction | 2024 |
| ALE Houses Inc Ltd | Hospitality | 2019 |
| Aleeba Ltd | Health & social care | 2019 |
| Aleef Travels Yorkshire Ltd | Administrative & support | 2025 |
| Alegra Properties Limited | Real estate | 2014 |
| Alegria Studio Ltd | Professional & scientific | 2024 |
| Alejandria Ltd | Information & communication | 2025 |
| Alekh Capital Ltd | Real estate | 2023 |
| Alelfe Project Management Ltd | Information & communication | 2016 |
| Alemad Ltd | Transport & logistics | 2024 |
| Alens Barber Leeds Ltd | Other services | 2024 |