| Ablatus Therapeutics Limited | Professional & scientific | 2015 |
| Ablaze Promotions Limited | Wholesale & retail | 2021 |
| Able & Able Upholstery Limited | Manufacturing | 2002 |
| Able 2 Help Mobility Limited | Wholesale & retail | 2014 |
| Able Exhibitions Limited | | 1982 |
| Able Packaging Group Limited | Administrative & support | 1975 |
| Able Young Minds Ltd | Health & social care | 2021 |
| Ableflow Limited | Manufacturing | 1991 |
| Ableigh Country Inn Ltd | Other services | 2016 |
| Ablr Services Ltd | Professional & scientific | 2019 |
| ABM Consultancy Limited | Financial services | 2017 |
| ABM Hand Ltd | Professional & scientific | 2019 |
| ABM Hygiene Therapist Limited | Health & social care | 2020 |
| Abmh Holdings Limited | Financial services | 2016 |
| Abms Global Ltd | Health & social care | 2025 |
| Abode Assets Group Limited | Administrative & support | 2002 |
| Abode Invests Limited | Real estate | 2016 |
| Abode Maintenance Limited | Administrative & support | 2009 |
| Abode Realty Private Limited | Real estate | 2021 |
| Abodhi Design Ltd | Professional & scientific | 2017 |
| Aboreeda Medical Ltd | Health & social care | 2022 |
| Aboughazy Anaesthetics Ltd | Health & social care | 2025 |
| Abouzied Limited | Health & social care | 2023 |
| Above ALL Ltd | Wholesale & retail | 2025 |
| Above and Beyond Loft Conversions Specialists Ltd | Construction | 2020 |
| Above and Beyonder Limited | Real estate | 2020 |
| Above Salons Ltd | Other services | 2020 |
| Above Standard Ltd | Construction | 2025 |
| ABP (Leeds) Ltd | Real estate | 2026 |
| Abqari Trust Limited | Education | 2014 |
| ABR Grace Solutions Limited | Administrative & support | 2022 |
| ABR Properties Limited | Real estate | 1996 |
| ABR Real Estate Ltd | Real estate | 2020 |
| ABR Solicitors Limited | Professional & scientific | 2010 |
| Abracs 2013 Limited | Professional & scientific | 2013 |
| Abracs Limited | Wholesale & retail | 1999 |
| Abraham Moon & Sons Limited | Manufacturing | 1920 |
| Abraham Moon Holdings Limited | Financial services | 2005 |
| Abraham Vehicle Services Limited | Wholesale & retail | 2003 |
| Abramson Hall Limited | Professional & scientific | 2014 |
| Abrar International Ltd | Wholesale & retail | 2007 |
| Abrecovery Ltd | Transport & logistics | 2025 |
| ABS Auto Bodyshine Ltd | Administrative & support | 2017 |
| ABS Builder (Leeds) Ltd | Construction | 2021 |
| ABS Car Wash (York) Ltd | Administrative & support | 2018 |
| ABS Car Wash Ltd | Administrative & support | 2017 |
| ABS Dent Care Ltd | Health & social care | 2014 |
| ABS Dent Ltd | Health & social care | 2011 |
| ABS Global Property Ltd | Construction | 2026 |
| ABS Houses Ltd | Real estate | 2020 |
| ABS Medical Services Ltd | Health & social care | 2022 |
| Absolute Access Limited | Administrative & support | 2002 |
| Absolute Arbitrage Ltd | Financial services | 2018 |
| Absolute Flooring Solutions (Yorkshire) Ltd | Construction | 2024 |
| Absolute Inclusion Ltd | Education | 2026 |
| Absolute Roofing 24/7 Limited | Construction | 2024 |
| Absolute Self Drive Car/Van Hire Limited | Administrative & support | 2016 |
| Absolute Studio Ltd | Manufacturing | 2017 |
| Absolute Warehouse Services Limited | Transport & logistics | 2009 |
| Absolutezero Software Development Limited | Information & communication | 2018 |
| Abss Properties Ltd | Real estate | 2025 |
| Absterling Properties Limited | Real estate | 2025 |
| Abstract Brickwork Ltd | Construction | 2019 |
| Abstract Group Limited | Financial services | 2022 |
| Abstract Online Limited | Information & communication | 2005 |
| Abstract Records Ltd | Information & communication | 2024 |
| Abstract Tech Limited | Information & communication | 2017 |
| Abstract Topco Limited | Financial services | 2024 |
| Absupport Limited | Information & communication | 2013 |
| Abtarardeals Ltd | Wholesale & retail | 2024 |
| Abtech (Leeds) Limited | Other services | 2024 |
| ABU Bakar (Batley) Ltd | Wholesale & retail | 2023 |
| ABU Turkish Patisserie Ltd | Wholesale & retail | 2024 |
| Abubakar Properties Limited | Real estate | 2026 |
| Abuela Records Limited | Information & communication | 2025 |
| Abundance Haven Ltd | Real estate | 2025 |
| Abundance Income Limited | Real estate | 2019 |
| Abundance Real Estate Limited | Real estate | 2019 |
| Abundance Seeker Ltd | Transport & logistics | 2019 |
| Abusalma Medical Consultancy Limited | Other services | 2023 |
| ABW Construction Ltd | Construction | 2009 |
| ABW Heating & Electrical Ltd | Construction | 2022 |
| Abys Consulting Limited | Professional & scientific | 2015 |
| Abyshire Technology Ltd | Information & communication | 2023 |
| Abyss Machinery Limited | Manufacturing | 2012 |
| Abyss Marketing Limited | Professional & scientific | 2014 |
| AC & F Care Ltd | Health & social care | 2014 |
| AC Auto Locksmiths Limited | Wholesale & retail | 2019 |
| AC Commercial Solutions Ltd | Construction | 2022 |
| AC Database Services Limited | Information & communication | 2010 |
| AC Healthcare Resources Limited | Health & social care | 2017 |
| AC Secure Systems Ltd | Administrative & support | 2020 |
| AC Signs Limited | Manufacturing | 2022 |
| AC Valeting Ltd | Administrative & support | 2022 |
| AC Works Group Ltd | Construction | 2023 |
| Ac&Co Group Limited | Wholesale & retail | 2025 |
| AC8 Football Academy Limited | Arts & recreation | 2019 |
| AC8 Properties Ltd | Real estate | 2017 |
| AC88 Transport Ltd | Transport & logistics | 2024 |
| Acacia Farm Ltd | Construction | 2021 |