| Aassandhutransport Ltd | Transport & logistics | 2021 |
| AAT Global Ltd | Public administration | 2024 |
| Aaven Logistics Ltd | Transport & logistics | 2026 |
| AAW Joinery Ltd | Manufacturing | 2022 |
| AAY Foods Ltd | Hospitality | 2025 |
| AAY Properties Ltd | Real estate | 2026 |
| AAZ Developments Limited | Construction | 2022 |
| AB Cakes (2025) Limited | Manufacturing | 2025 |
| AB Globe Ltd | Professional & scientific | 2019 |
| AB Heyyy Limited | Wholesale & retail | 2025 |
| AB Mechanical Ltd | Construction | 2025 |
| AB Service & Recovery Ltd | Wholesale & retail | 2025 |
| AB Temporary Fencing Ltd | Manufacturing | 2026 |
| AB1 Consultancy Limited | Wholesale & retail | 2019 |
| ABA Supreme Ltd | Other services | 2024 |
| Abaan Ltd | Real estate | 2023 |
| Abacus Rail Limited | Extraterritorial | 2009 |
| Abacus Surveying Services Limited | Professional & scientific | 2008 |
| Abacus Wealth Services Limited | Financial services | 2021 |
| Abange Limited | Professional & scientific | 2022 |
| ABB Property Limited | Real estate | 2023 |
| Abbey Cleaning Limited | Other services | 1994 |
| Abbey Lodge Care Limited | Real estate | 2015 |
| Abbey Serviced Apartments Limited | Hospitality | 2023 |
| Abbottabad Ltd | Wholesale & retail | 2025 |
| Abby & Logan Properties Limited | Real estate | 2025 |
| ABC Construction Solutions Ltd | Construction | 2026 |
| ABC Early Learning & Childcare Centre UK Limited | Other services | 2002 |
| ABC Support Limited | Health & social care | 2022 |
| ABC Van Hire Limited | Administrative & support | 2011 |
| Abco Electrical Services Limited | Construction | 2014 |
| Abdul Ahad Limited | Wholesale & retail | 2026 |
| Abdul Building Services Ltd | Construction | 2019 |
| Abdul Private Limited | Wholesale & retail | 2024 |
| Abduljan Ltd | Wholesale & retail | 2026 |
| Abdulrehman Ltd | Information & communication | 2025 |
| Abeer Ltd | Construction | 2025 |
| Abel Roofing Ltd | Construction | 2025 |
| Aberdeen's Cake Box Ltd | Wholesale & retail | 2024 |
| Aberdovey Breaks Limited | Extraterritorial | 2003 |
| ABG Think Ltd | Other services | 2020 |
| Abhi Ltd | Hospitality | 2026 |
| Abhub Limited | Wholesale & retail | 2024 |
| ABI Electrical Solutions Ltd | Construction | 2025 |
| Abiba Limited | Administrative & support | 2017 |
| Abimatic Care Ltd. | Health & social care | 2020 |
| Abisi Abasa Company Ltd | Other services | 2026 |
| ABJ Enterprises Limited | Real estate | 2025 |
| ABK Logistics Ltd | Transport & logistics | 2025 |
| Abkb Investments Limited | Financial services | 2024 |
| Able Engineering Products Limited | Manufacturing | 2006 |
| Able Facilities Group Limited | Administrative & support | 2014 |
| Ablifeecom Ltd | Wholesale & retail | 2026 |
| ABM Builders Limited | Construction | 2005 |
| ABM Group Holding Ltd | Financial services | 2018 |
| Aboi Limited | Real estate | 2021 |
| Aboki Global Trading Ltd | Wholesale & retail | 2025 |
| Above and Beyond Media Group Limited | Professional & scientific | 2023 |
| Above Next Ltd | Wholesale & retail | 2026 |
| ABP Accountancy Services Limited | Professional & scientific | 2010 |
| ABP Property Holdings Ltd | Real estate | 2024 |
| Abraxas Investments Limited | Administrative & support | 1999 |
| ABS Facility Solutions Ltd | Administrative & support | 2025 |
| ABS Henn Ltd | Professional & scientific | 2020 |
| ABS114 Healthcare Solutions Ltd | Health & social care | 2026 |
| ABS114 Hospitality Ltd | Hospitality | 2026 |
| ABS114 Limited | Financial services | 2026 |
| Absolute Apparel Limited | Wholesale & retail | 2004 |
| Absolute Care Solutions Limited | Health & social care | 2016 |
| Absolute Decorating Limited | Construction | 2005 |
| Absolute Professional Services Limited | Real estate | 2024 |
| Absolute Services Intl Limited | Administrative & support | 2022 |
| Abstract Aerial Art Ltd | Professional & scientific | 2017 |
| Abstract Blinds Ltd | Manufacturing | 2016 |
| Abstract Counselling and Support CIC | Administrative & support | 2021 |
| Abstrakt Events Ltd | Administrative & support | 2024 |
| ABT Estates Ltd | Real estate | 2023 |
| Abundant Food Centre Limited | Hospitality | 2017 |
| ABZ Builders Limited | Administrative & support | 2017 |
| AC Carpenters Limited | Construction | 2016 |
| AC Crystal Clean UK Ltd | Administrative & support | 2025 |
| AC EU Services Ltd | Professional & scientific | 2020 |
| AC Gifts Limited | Wholesale & retail | 2016 |
| AC Holding Group Limited | Real estate | 2025 |
| AC International Limited | Administrative & support | 2024 |
| Acacia Grove Homes Ltd | Real estate | 2025 |
| Academic Consultancy Services Limited | Professional & scientific | 1997 |
| Academic Plus Ltd | Education | 2023 |
| Academy Kits Limited | Manufacturing | 2023 |
| Academy Motorsport Limited | Arts & recreation | 2011 |
| Academy Training Ltd | Education | 2014 |
| Acam Video Limited | Information & communication | 2003 |
| Acaninternational Ltd | Manufacturing | 2025 |
| Acanthus Developments Ltd | Administrative & support | 2018 |
| Acanthus Properties Ltd | Real estate | 1991 |
| ACB Gifts UK Ltd | Wholesale & retail | 2025 |
| Acceber Design Limited | Professional & scientific | 2012 |
| Accelero Logistics Ltd | Transport & logistics | 2014 |
| Access 2 Barristers Direct Limited | Administrative & support | 2013 |
| Access Karting-Uk Ltd | Arts & recreation | 2022 |