| AK Motors Bradford Ltd | Wholesale & retail | 2025 |
| AK Talukdar Holdings Ltd | Wholesale & retail | 2025 |
| AKA the Recruitment Specialists Limited | Administrative & support | 2011 |
| Akaizac Ltd | Wholesale & retail | 2024 |
| Akjem Healthcare Services Ltd | Health & social care | 2023 |
| AKM PVT Ltd | Wholesale & retail | 2025 |
| AKO Geotechnical Group Limited | Professional & scientific | 2016 |
| Akram Build Ltd | Construction | 2025 |
| Akshainie Consulting Limited | Education | 2025 |
| Akshainie Limited | Information & communication | 2018 |
| Akshainie Properties Limited | Real estate | 2022 |
| Akshar Convenience Store Ltd | Wholesale & retail | 2025 |
| Aktints Ltd | Wholesale & retail | 2013 |
| Aktive Fire Design Limited | Professional & scientific | 2022 |
| Akut Marketing Ltd | Extraterritorial | 2016 |
| AL Ahad Corporation Ltd | Hospitality | 2022 |
| AL Jazeera Auto Trading Ltd | Wholesale & retail | 2025 |
| AL Metals Ltd | Wholesale & retail | 2017 |
| AL Noor Pharmacy Limited | Financial services | 2011 |
| AL Saddique Ltd | Real estate | 2025 |
| Al-Adl Ltd | Real estate | 2025 |
| Al-Shakoor Limited | Hospitality | 2016 |
| Alacrity House Ltd | Real estate | 2016 |
| Aladdin Logistics Limited | Transport & logistics | 2022 |
| Alafiaa Limited | Wholesale & retail | 2020 |
| Alan Whylde Joinery Limited | Manufacturing | 2004 |
| Alben Electrical Services Ltd | Professional & scientific | 2015 |
| Albert Parker & SON Limited | Wholesale & retail | 1965 |
| Albion Crestline Limited | Information & communication | 2026 |
| ALC Systems Ltd | Construction | 2023 |
| Alchemy Research Associates Limited | Professional & scientific | 2000 |
| Alchemy Research Limited | Professional & scientific | 2006 |
| Alchris Audio Limited | Manufacturing | 2021 |
| Alcuin Homes (Brighouse) Limited | Construction | 2014 |
| Alcuin Homes Holdings Limited | Extraterritorial | 2015 |
| Aldbourne Properties Limited | Households | 1984 |
| Aldin Property Limited | Real estate | 2025 |
| Aldred Sports Management Limited | Arts & recreation | 2015 |
| Alegna Limited | Real estate | 1987 |
| Alerce Care Limited | Health & social care | 2026 |
| Alex Carriage Ltd | Transport & logistics | 2019 |
| Alex Engineering Services Ltd | Construction | 2019 |
| Alex Walker Architecture Ltd | Professional & scientific | 1999 |
| Alexaandra West Ltd | Administrative & support | 2018 |
| Alf-Fe Limited | Manufacturing | 2021 |
| Alfmya Group Limited | Financial services | 2024 |
| Alfred Hawkins and Company Limited | Professional & scientific | 2021 |
| Alge Pathways Limited | Professional & scientific | 2026 |
| Algoil 99 Ltd | Manufacturing | 2014 |
| Algorithmic Solutions Ltd | Information & communication | 2021 |
| ALH Groundworks Limited | Construction | 2013 |
| Alhambra Care Limited | Health & social care | 2010 |
| ALI Services Limited | Health & social care | 2021 |
| ALI Toor Ltd | Other services | 2021 |
| Ali's Auto Repairs (Wakefield) Ltd | Wholesale & retail | 2026 |
| Ali's Local Ltd | Wholesale & retail | 2025 |
| Ali's Lounge Ltd | Hospitality | 2021 |
| Ali's Partners Ltd | Real estate | 2026 |
| Alicialambert Ltd | Hospitality | 2025 |
| Align Property Limited | Real estate | 2013 |
| Aligning Minds Ltd | Other services | 2025 |
| Alinéra Ltd | Wholesale & retail | 2026 |
| Aliza & Hoorain Limited | Transport & logistics | 2021 |
| Alize.Digital Ltd | Professional & scientific | 2024 |
| ALK Earthworks & Landscaping Ltd | Construction | 2020 |
| ALL Clear (Yorkshire) Ltd | Administrative & support | 2016 |
| ALL Records Broken Ltd | Manufacturing | 2018 |
| ALL Saints Support Ltd | Administrative & support | 2020 |
| ALL Season Fencing Ltd | Construction | 2022 |
| ALL Things Deluxe Ltd | Professional & scientific | 2023 |
| ALL Things Equal Consulting Ltd | Professional & scientific | 2025 |
| Allbase Group Ltd | Manufacturing | 2015 |
| Allen's Newsagents Limited | Wholesale & retail | 2020 |
| Alleviate IT Solutions Ltd | Information & communication | 2024 |
| Allgas (Wakefield) Limited | Wholesale & retail | 2000 |
| Alliance One Oilfield Ltd | Manufacturing | 2021 |
| Alliance Stocktakers Ltd | Administrative & support | 2019 |
| Allied Care, Consultancy, Education, Planning and Training Ltd | Information & communication | 2025 |
| Allmore Homes Limited | Real estate | 2025 |
| Allott Property Limited | Real estate | 2014 |
| Allrounder Marketing+Consulting Ltd. | Professional & scientific | 2007 |
| Allstal Engineering Ltd | Professional & scientific | 2022 |
| Allways Consulting Ltd | Professional & scientific | 2014 |
| Allyouneedgb Ltd | Wholesale & retail | 2023 |
| Almore Life Care Limited | Health & social care | 2025 |
| Alpaca Trail Adventures Crowle Ltd | Agriculture & fishing | 2026 |
| Alpha Edge Traders Ltd | Information & communication | 2025 |
| Alpha Graphic Machinery (UK) Ltd | Manufacturing | 2010 |
| Alpha Integrated Security Systems Ltd | Administrative & support | 2026 |
| Alpha Wolf Limited | Transport & logistics | 2024 |
| Alphabet Holdings BC Limited | Professional & scientific | 2017 |
| Alphapro Smartdial Ltd. | Manufacturing | 2013 |
| ALS Cleaning Contractors Limited | Administrative & support | 2016 |
| Alternative Care Limited | Health & social care | 2000 |
| Alternative Finishes Limited | Construction | 1999 |
| Alternative Water Company Ltd | Professional & scientific | 2026 |
| Althane Tech Ltd | Information & communication | 2025 |
| Alto Techniques Limited | Construction | 2019 |
| Altofts Community and Sports Foundation Limited | Arts & recreation | 2011 |
| Altura Partners Limited | Administrative & support | 2024 |