| Aarush IT Limited | Information & communication | 2018 |
| Aashay Advisors Ltd | Professional & scientific | 2026 |
| Aashay Limited | Real estate | 2023 |
| Aashi Limited | Other services | 2011 |
| Aasmi Technologies Limited | Information & communication | 2024 |
| Aava Design Limited | Other services | 2017 |
| Aava Venture Ltd | Hospitality | 2025 |
| Aawi Enterprise Ltd | Transport & logistics | 2019 |
| Aayzee Global Enterprises Ltd | Wholesale & retail | 2025 |
| AB Absolute Limited | Arts & recreation | 2025 |
| AB Engineering & Consultancy Ltd | Professional & scientific | 2018 |
| AB Link Ltd | Information & communication | 2024 |
| AB Medical Group Limited | Health & social care | 2025 |
| AB Moss Limited | Wholesale & retail | 2021 |
| AB Proport Ltd | Real estate | 2023 |
| AB Tech Supports Ltd | Information & communication | 2022 |
| Ab&S Businesses Ltd | Health & social care | 2018 |
| ABA Renovations Ltd | Construction | 2018 |
| ABA Solutions Limited | Transport & logistics | 2014 |
| Ababc Limited | Health & social care | 2025 |
| Abacas Studios Limited | Manufacturing | 2009 |
| Abacus IT Consultants Limited | Information & communication | 2014 |
| Abacus TEC Ltd | Information & communication | 2019 |
| Abadis Ltd | Health & social care | 2021 |
| Abayaelegance Ltd | Wholesale & retail | 2026 |
| Abbasi Property Management Ltd | Other services | 2020 |
| Abbcan Solutions Limited | Wholesale & retail | 2008 |
| Abbey Build Conversions Ltd | Construction | 2016 |
| Abbey Mews Management Company Limited | Real estate | 1982 |
| Abbey Motors MK Ltd | Wholesale & retail | 2024 |
| Abbeyclone Limited | Real estate | 1998 |
| Abbeygate Design Limited | Professional & scientific | 2003 |
| Abbeymead Limited | Professional & scientific | 2014 |
| Abbeymill Developments Limited | Real estate | 2020 |
| Abbeymill Housing Partnerships Ltd | Real estate | 2026 |
| Abbots Place Estate Management Company Limited | Real estate | 2022 |
| Abbotts Auto Services Ltd | Wholesale & retail | 2024 |
| Abbrr Limited | Information & communication | 2015 |
| Abbyna Limited | Health & social care | 2015 |
| ABC Enterprise Systems Limited | Information & communication | 2001 |
| ABC Food Ltd | Hospitality | 2023 |
| Abchedd Property Ltd | Real estate | 2022 |
| Abdulrasheed Olalekan Healthcare Ltd | Health & social care | 2013 |
| Abema Healthcare Limited | Public administration | 2023 |
| Abemin Education Centre Ltd | Education | 2019 |
| Abenako Properties Ltd | Extraterritorial | 2022 |
| Aberdeen & Cunningham Properties Limited | Real estate | 1984 |
| Aberdino Ltd | Professional & scientific | 2021 |
| Abff Healthcare Limited | Health & social care | 2017 |
| ABG Enterprises (Woburn) Ltd | Wholesale & retail | 2023 |
| Abhay PVT Ltd | Professional & scientific | 2021 |
| Abhiramsoft Limited | Wholesale & retail | 2011 |
| ABI Newsagents Ltd | Wholesale & retail | 2015 |
| Abibadem Ltd | Information & communication | 2019 |
| Abicare 71 Limited | Health & social care | 2014 |
| Abide Property Services Ltd | Real estate | 2024 |
| Abigail Day Care Ltd | Health & social care | 2023 |
| Ability Care Services Ltd | Health & social care | 2019 |
| Ability Support Services Limited | Professional & scientific | 2024 |
| Abington Decorators Limited | Administrative & support | 2015 |
| Abismo Ltd | Manufacturing | 2023 |
| Abiwill Limited | Health & social care | 2020 |
| Abiyan Properties Ltd | Real estate | 2021 |
| ABK JET Ltd | Construction | 2025 |
| Ablaze Kleening Services Ltd | Administrative & support | 2015 |
| Ablaze Solutions Limited | Health & social care | 2023 |
| Able Hospitality Ltd | Other services | 2023 |
| Able International Limited | Administrative & support | 2019 |
| Able Plumbing Solutions Ltd | Construction | 2012 |
| ABM Holdings Limited | Financial services | 2018 |
| Abmman Limited | Wholesale & retail | 2025 |
| ABN Benefits Ltd | Professional & scientific | 2026 |
| ABN Rewards Ltd | Administrative & support | 2023 |
| Abnd Holdings Limited | Professional & scientific | 2023 |
| ABO Accountants Ltd | Professional & scientific | 2021 |
| Abode Installations Ltd | Construction | 2018 |
| Abofall Limited | Information & communication | 2007 |
| Abotech Services Limited | Information & communication | 2014 |
| Abotheia Ltd | Administrative & support | 2018 |
| About Detailing Ltd | Professional & scientific | 2022 |
| About Property UK Ltd | Real estate | 1999 |
| Above and Beyond Drone Solutions Limited | Extraterritorial | 2023 |
| Above PAR Consulting Ltd | Other services | 2016 |
| Above the Bay Ltd | Arts & recreation | 2008 |
| Abphil Ltd | Transport & logistics | 2025 |
| ABR Station Express Ltd | Wholesale & retail | 2015 |
| Abraham Express Ltd | Administrative & support | 2017 |
| Abrar Ltd | Education | 2015 |
| Abreeze Ltd | Real estate | 2024 |
| ABS Mart Limited | Wholesale & retail | 2026 |
| Abscent PTY Limited | Extraterritorial | 2025 |
| Absk International Group Limited | Manufacturing | 2021 |
| Absolute Circuits Ltd | Information & communication | 2020 |
| Absolute ESG Ltd | Professional & scientific | 2024 |
| Absolute Micro Communications Limited | Information & communication | 1995 |
| Absolute Number Plates Limited | Wholesale & retail | 2021 |
| Absolute Stays Ltd | Real estate | 2020 |
| Absorption Systems Limited | Manufacturing | 2026 |
| Abstract Fork Lift Training Ltd | Education | 2025 |
| ABSTRACT2CONSTRUCT Limited | Construction | 2015 |