| Abhi Builders Ltd | Construction | 2020 |
| ABI Property Solutions Ltd | Real estate | 2025 |
| ABI Vehicle Sales Limited | Wholesale & retail | 2018 |
| Abington Colnbrook Management Company Limited | Households | 1980 |
| Abington Pharmacy Limited | Wholesale & retail | 2005 |
| ABK IT Solutions PVT Ltd | Information & communication | 2023 |
| Abkr Holdings Limited | Real estate | 2018 |
| Able Construction (London) Ltd | Construction | 2017 |
| Ablexique Ltd | Wholesale & retail | 2024 |
| Ablinc Malibu Consulting Ltd | Wholesale & retail | 2023 |
| Ablique Fitness Limited | Arts & recreation | 2022 |
| ABM Autos Limited | Wholesale & retail | 2019 |
| ABM Transport Solutions Ltd | Wholesale & retail | 2026 |
| ABM Tronix Ltd | Information & communication | 2025 |
| Abmh Estates Holding Ltd | Financial services | 2026 |
| Abmj Properties Ltd | Real estate | 2019 |
| About MOI Ltd | Other services | 2021 |
| Abovethewings Ltd | Administrative & support | 2023 |
| ABR Kitchens Ltd | Hospitality | 2025 |
| Abra Industries Ltd | Wholesale & retail | 2025 |
| ABS Groundwork Limited | Manufacturing | 2021 |
| ABS IT Consulting Services Ltd | Information & communication | 2024 |
| Absolute Brilliance Cleaning Ltd | Administrative & support | 2014 |
| Absolute Direct Ltd | Wholesale & retail | 2022 |
| Absolute Floors Ltd | Construction | 2022 |
| Absolute Plumbing & Bathrooms Ltd | Other services | 2021 |
| Absolute Post Limited | Information & communication | 2003 |
| Absolute Training & Development Ltd | Public administration | 2023 |
| Absolute Workwear Ltd | Wholesale & retail | 2022 |
| Absolution Consulting Ltd | Professional & scientific | 2015 |
| Absorbee Ltd | Wholesale & retail | 2023 |
| Absub Online Ltd | Wholesale & retail | 2024 |
| ABT Tuning Ltd | Wholesale & retail | 2023 |
| Abundant Redemption Ltd | Health & social care | 2019 |
| ABY Transport Services Ltd | Transport & logistics | 2026 |
| AC Auto Color Ltd | Wholesale & retail | 2021 |
| AC Buildclean Ltd | Construction | 2025 |
| AC Global Trading Ltd | Wholesale & retail | 2025 |
| AC Transport Management Limited | Other services | 2025 |
| AC Ventilation Systems Limited | Construction | 2018 |
| AC20 Ltd | Transport & logistics | 2020 |
| ACA Pharma Ltd | Professional & scientific | 2025 |
| Acad International Business Training Ltd | Administrative & support | 2022 |
| Academy of Indian Music & Dance Ltd | Other services | 2026 |
| ACC Enterprises Ltd | Wholesale & retail | 2021 |
| Accelerate Gym Ltd | Arts & recreation | 2025 |
| Accelerated Home Health Ltd | Health & social care | 2018 |
| Accent Investments Limited | Construction | 2018 |
| Access Consulting Limited | Professional & scientific | 2024 |
| Access Languages Ltd | Professional & scientific | 2024 |
| Access VC Limited | Financial services | 2019 |
| Accevia Academe Ltd | Education | 2021 |
| Accident Claims Compensation Specialists Ltd | Professional & scientific | 2011 |
| Accomo Services Ltd | Real estate | 2024 |
| Accomodation.X Ltd | Real estate | 2023 |
| Accordion Technology Limited | Information & communication | 2016 |
| Account and Services Limited | Administrative & support | 2017 |
| Accountancy Chamber Ltd | Professional & scientific | 2026 |
| Accountant Tax Ltd | Information & communication | 2024 |
| Accounting Horizon (UK) Ltd | Professional & scientific | 2014 |
| Accounting Personnel Ltd | Professional & scientific | 2019 |
| Accounting Services for ALL Ltd | Professional & scientific | 2019 |
| Accountinguide Ltd | Professional & scientific | 2016 |
| Accountntax Limited | Professional & scientific | 2019 |
| ACCTS44 Limited | Health & social care | 2023 |
| Accure Fire and Flood Restoration Ltd | Administrative & support | 2009 |
| Ace Cleaners and Removals Ltd | Transport & logistics | 2022 |
| Ace Design Build Limited | Construction | 2022 |
| Ace Fortuna Ltd | Professional & scientific | 2025 |
| Ace Metric Media Ltd | Information & communication | 2024 |
| Ace Motor Company (UK) Ltd | Wholesale & retail | 2008 |
| Ace of Blades AOB Ltd | Other services | 2024 |
| Ace Properties Group Ltd | Real estate | 2024 |
| Ace Retail Training Limited | Administrative & support | 2013 |
| Ace Security Consulting Limited | Administrative & support | 2025 |
| Ace Social Media Limited | Information & communication | 2019 |
| Ace Specialist Cars Ltd | Wholesale & retail | 2024 |
| Ace Storage and Recovery Ltd | Transport & logistics | 2026 |
| Ace Sweets Limited | Manufacturing | 2018 |
| Ace Transporter Ltd | Transport & logistics | 2023 |
| ACE3 Ltd | Wholesale & retail | 2022 |
| Acent Investments Limited | Real estate | 1993 |
| Acharya for Life Solutions Limited | Information & communication | 2026 |
| Achhar Consulting Ltd | Professional & scientific | 2025 |
| Achievable Properties Ltd | Hospitality | 2018 |
| Achieve UK Limited | Professional & scientific | 2002 |
| Ackha Limited | Professional & scientific | 2024 |
| Aclass Consultancy Ltd | Information & communication | 2023 |
| Acme Recruitment Consultants Ltd | Administrative & support | 2021 |
| Acnestis Limited | Health & social care | 2018 |
| Acnoor Limited | Wholesale & retail | 2020 |
| Acom IT Ltd | Information & communication | 2020 |
| Acomad Ltd | Real estate | 2024 |
| Acorn Assets Ltd | Real estate | 2023 |
| Acorn Springs Ltd | Health & social care | 2023 |
| Acoustic Detection Ltd | Information & communication | 2024 |
| Acquisitions & Alliances Ltd | Real estate | 2024 |
| Actic Advisors Limited | Financial services | 2009 |
| Actic Partners LLP | | 2009 |
| Actis Global Ltd | Other services | 2023 |