| AB Investigations Ltd | Administrative & support | 2012 |
| AB Landscape Construction Limited | Construction | 2026 |
| AB Letting Agents Ltd | Real estate | 2020 |
| AB Motors (Leeds) Limited | Wholesale & retail | 2018 |
| AB Ophthalmics Ltd | Health & social care | 2025 |
| AB Ortho & Aesthetics Ltd | Health & social care | 2022 |
| AB Pharma Solutions Ltd | Wholesale & retail | 2023 |
| AB Plant Repairs Ltd | Manufacturing | 2019 |
| AB Property Maintenance Ltd | Construction | 2017 |
| AB Property Network Ltd | Real estate | 2025 |
| AB21 Consultancy Ltd | Financial services | 2023 |
| AB3 Locums Ltd | Health & social care | 2024 |
| AB3 Medical Ltd | Information & communication | 2021 |
| ABA Developments (U.K) Ltd | Real estate | 2023 |
| Abacus 152 Limited | Professional & scientific | 2007 |
| Abacus Tax Advisors Ltd | Professional & scientific | 2015 |
| Abacus Therapy Services Ltd | Information & communication | 2023 |
| Abacus Training Group Limited | Administrative & support | 2008 |
| Abacus X Ltd | Manufacturing | 2019 |
| Abadat Acquisitions Limited | Real estate | 2021 |
| Abago Limited | Wholesale & retail | 2023 |
| Abas Cafe Ltd | Hospitality | 2019 |
| Abas Solutions Ltd | Information & communication | 2017 |
| Abaseen Chapeltown Ltd | Wholesale & retail | 2021 |
| Abaseen Superstore (UK) Ltd | Wholesale & retail | 2015 |
| Abbas Property Ltd | Real estate | 2021 |
| Abberdale Guttering Limited | Construction | 2026 |
| Abbey Car Sales Ltd | Wholesale & retail | 2025 |
| Abbey Contract Flooring Limited | Manufacturing | 1999 |
| Abbey Court Vicarage Terrace Management Company Limited | Households | 2005 |
| Abbey Multi Academy Trust | Education | 2011 |
| Abbey OIL Waste Ltd | Water & waste | 2023 |
| Abbey Upholstery Leeds Limited | Wholesale & retail | 2015 |
| Abbey Wedding Warehouse Limited | Wholesale & retail | 2003 |
| Abbey World Services Ltd | Professional & scientific | 2022 |
| Abbey's Store Limited | Wholesale & retail | 2025 |
| Abbeycrown Limited | Real estate | 2017 |
| Abbeydale SPV Limited | Real estate | 2026 |
| Abbeystone Gardens Limited | Households | 2017 |
| Abbie Hartley Life Guidance Ltd | Other services | 2026 |
| Abbigale Newell Ltd | Administrative & support | 2024 |
| Abbot Group Limited | Mining & quarrying | 1959 |
| Abbot Holdings Limited | Administrative & support | 1992 |
| Abbot Investments (North Africa) Limited | Administrative & support | 2004 |
| Abbot Passive Fire Ltd | Construction | 2025 |
| Abbots Terrace Property Limited | Real estate | 2023 |
| Abbotsbury Management Ltd | Real estate | 2024 |
| Abbott Decorating Ltd | Other services | 2019 |
| Abbott Land & Planning Ltd | Other services | 2026 |
| Abbott Learning Ltd | Education | 2023 |
| Abbott Legal Limited | Professional & scientific | 2022 |
| Abbotts Properties (Leeds) Limited | Real estate | 2016 |
| Abby Roberts Cosmetics Ltd | Arts & recreation | 2020 |
| ABC Cricket Academy Ltd | Arts & recreation | 2023 |
| ABC Joinery Ltd | Construction | 2022 |
| ABC Science Ltd | Education | 2025 |
| ABC Yorkshire Ltd | Construction | 2021 |
| Abc@D's Limited | Education | 2012 |
| Abcplus Healthcare Services Ltd | Health & social care | 2025 |
| ABD Design & Consulting Limited | Manufacturing | 2006 |
| ABD FM Services Ltd | Administrative & support | 2019 |
| Abdoulaye Ltd | Transport & logistics | 2025 |
| Abdullah Manik Ltd | Financial services | 2026 |
| Abduls (Yorkshire) Ltd | Hospitality | 2020 |
| Abduls C Carry Ltd | Wholesale & retail | 2013 |
| Abduls Group (Yorkshire) Ltd | Financial services | 2023 |
| Abduls Ltd | Hospitality | 2008 |
| Abduls Properties (Yorkshire) Ltd | Real estate | 2023 |
| ABE Properties Ltd | Real estate | 2018 |
| Abeelabb Limited | Health & social care | 2025 |
| Abel Builders Ltd | Construction | 2024 |
| Abel Cleaning Services Ltd | Administrative & support | 2020 |
| Abel Palaghia Limited | Transport & logistics | 2025 |
| Abenixs Limited | Wholesale & retail | 2020 |
| Abercrombie Business Consulting Ltd | Professional & scientific | 2019 |
| Aberfield Communications Limited | Professional & scientific | 2012 |
| Aberford Bridge Private Gardens Limited | Other services | 1985 |
| Aberford Interiors Limited | Extraterritorial | 2007 |
| Aberford Kitchens Limited | Wholesale & retail | 2005 |
| Aberford Road Limited | Real estate | 2020 |
| Abertrade Limited | Other services | 2002 |
| Abes Crossgates Day & Night Ltd | Wholesale & retail | 2010 |
| Abeto Holdings Limited | Financial services | 2020 |
| ABH Property Group Ltd | Real estate | 2023 |
| Abhaile Construction Ltd | Construction | 2022 |
| Abhika Aura Ltd | Information & communication | 2026 |
| ABI Saleem Production Ltd | Information & communication | 2021 |
| ABI Thompson Ltd | Professional & scientific | 2024 |
| Abids Pudsey Limited | Hospitality | 2021 |
| Abigaia Ltd | Wholesale & retail | 2018 |
| Abigail Housing | Hospitality | 2007 |
| Abigail Levin Consultancy Limited | Professional & scientific | 2002 |
| Ability Properties Limited | Real estate | 2020 |
| Abiola Oduwusi Services Ltd | Information & communication | 2022 |
| Abirose Limited | Real estate | 2011 |
| Abiy Ltd | Wholesale & retail | 2016 |
| ABJ Properties Limited | Real estate | 2005 |
| Abje Limited | Construction | 2024 |
| ABK Construction Services Ltd | Construction | 2019 |
| ABK1 | Financial services | 2017 |