| ABO Saleh Fridge Repair and Commercial Ltd | Wholesale & retail | 2018 |
| Abode Letting Agency Limited | Real estate | 2011 |
| Abode Residential Surveyors Ltd | Real estate | 2003 |
| Aboki Suya Limited | Hospitality | 2025 |
| About Eco Ltd | Professional & scientific | 2024 |
| Above & Beyond Scaffolding (NE) Limited | Construction | 2018 |
| Above and Beyond Decorating Ltd | Construction | 2026 |
| Abprotectivecoatings Ltd | Construction | 2023 |
| Abracadabra A1 Locksmiths Limited | Administrative & support | 2011 |
| Abraham Kiflu Ltd | Real estate | 2025 |
| Abraham Properties Ltd | Real estate | 2016 |
| Abri Trading Limited | Wholesale & retail | 2015 |
| Abrian Limited | Health & social care | 2022 |
| Abring Homes Limited | Real estate | 2025 |
| Abrs Wind Ltd | Administrative & support | 2024 |
| ABS Maintenance Services Ltd | Construction | 2026 |
| ABS Residential Ltd | Real estate | 2023 |
| ABS Service Accountancy & Bookkeeping Ltd | Professional & scientific | 2015 |
| Abs's Barbers Ltd | Other services | 2024 |
| Abs's Hair Stylists Limited | Other services | 2017 |
| Abshields Management Company Limited | Real estate | 2026 |
| Absolute Aesthetics by Rachael Wainwright Ltd | Health & social care | 2016 |
| Absolute Care Training & Education Ltd | Education | 2011 |
| Absolute Image Ltd | Health & social care | 2004 |
| Absolute Interior Design Limited | Wholesale & retail | 2003 |
| Absolute Luxury Furniture Ltd | Wholesale & retail | 2008 |
| Absolute Medicals Limited | Financial services | 2004 |
| Absolute Pleasure Limited | Transport & logistics | 2007 |
| Absolute Quality Business Solutions Ltd | Other services | 2025 |
| Absolute Skin Ltd | Health & social care | 2015 |
| Absolve Properties Limited | Real estate | 2025 |
| Abstract Offshore Services Ltd | Administrative & support | 2018 |
| Abuthltd Limited | Other services | 2022 |
| ABV NCL Ltd | Wholesale & retail | 2025 |
| AC Accom Limited | Hospitality | 2025 |
| AC Innovations Ltd | Wholesale & retail | 2009 |
| AC MIX Limited | Real estate | 2024 |
| AC Pharma Consultancy Ltd | Professional & scientific | 2024 |
| AC Plastering Restoring Ltd | Construction | 2017 |
| AC Psychology Ltd | Public administration | 2020 |
| Acacia Lets Ltd | Real estate | 2022 |
| Academically Ltd | Financial services | 2019 |
| Academy of Excellence Innovation Ltd | Education | 2023 |
| Acakhtar Limited | Health & social care | 2019 |
| Acarris Solutions Limited | Information & communication | 2018 |
| Acbc Tech Ltd | Professional & scientific | 2018 |
| Accent Atlantic Ltd | Administrative & support | 2021 |
| Accentra-Brownrigg Guarantee Ltd | Health & social care | 2026 |
| Accentuate Comms Limited | Wholesale & retail | 2006 |
| Accentuate North East Ltd | Other services | 2006 |
| Access Advise Ltd | Extraterritorial | 2025 |
| Access Engineering Solutions Ltd | Construction | 2024 |
| Access Given Ltd | Administrative & support | 2025 |
| Access Immigration Law Ltd | Professional & scientific | 2012 |
| Access Music Production Community Interest Company | Information & communication | 2022 |
| Accident Solicitors Limited | Professional & scientific | 2004 |
| Acclive Advisory & Solutions Limited | Construction | 2020 |
| Acclive Group Ltd | Real estate | 2020 |
| Accord Management Services Limited | Administrative & support | 1994 |
| Accorn Properties Group Ltd | Real estate | 2023 |
| Accounting Inc. Ltd | Professional & scientific | 2018 |
| Accountree Limited | Professional & scientific | 2014 |
| Accounts Wright Limited | Administrative & support | 2011 |
| Accountsbynet Limited | Professional & scientific | 2000 |
| Accountxble Limited | Other services | 2026 |
| Accredifire Systems Ltd | Construction | 2025 |
| Acctax Outsourcing Ltd | Professional & scientific | 2023 |
| Acctax Pro Services Ltd | Professional & scientific | 2025 |
| Acctax Services Ltd | Professional & scientific | 2016 |
| Accura Wealth Management Ltd | Administrative & support | 2015 |
| Accuracy Independent Certified Field Biologists Ltd | Other services | 2026 |
| Accurate Data Services Limited | Information & communication | 2003 |
| Acdc Plumbing & Heating Services Ltd | Construction | 2019 |
| Ace High CRM Ltd | Professional & scientific | 2024 |
| Ace Home Improvements & Construction Limited | Construction | 2018 |
| Ace of Braids Ltd | Other services | 2021 |
| Ace Spectrum Limited | Real estate | 2023 |
| Acecprop Ltd | Real estate | 2025 |
| Acedia Care (LL) Limited | Real estate | 2024 |
| Acedia Care Limited | Health & social care | 2023 |
| Aces Commercial Finance Ltd | Professional & scientific | 2019 |
| Aces Property Holdings Ltd | Real estate | 2021 |
| Aces Property Solutions Ltd | Real estate | 2018 |
| ACF Business Services Limited | Professional & scientific | 2007 |
| ACF Groundworks Ltd | Professional & scientific | 2026 |
| ACF Lettings Ltd | Real estate | 2025 |
| Acfb Project Management Limited | Information & communication | 2015 |
| ACG Trade Ltd | Administrative & support | 2025 |
| Achanalt Bess Limited | Energy | 2023 |
| Achieving Real Change in Communities CIC | Public administration | 2014 |
| Achomi Ltd | Information & communication | 2026 |
| Acid Gamelabs Ltd | Information & communication | 2026 |
| Acius Developments Limited | Construction | 2018 |
| Ackc Property Limited | Real estate | 2019 |
| Ackerman Investments Limited | Hospitality | 2024 |
| Acklam Events & Hospitality Limited | Wholesale & retail | 2023 |
| Acklam Green Management Limited | Households | 2012 |
| Acklam Park (the Oval) Management Company Limited | Real estate | 2006 |
| ACL Bathrooms Ltd | Construction | 2025 |
| ACL Data Ltd | Information & communication | 2022 |