| Accounts & Tax Advisor Ltd | Professional & scientific | 2008 |
| Accounts & Tax Ltd | Professional & scientific | 2019 |
| Accounts Hub Ltd | Professional & scientific | 2017 |
| Accowntax Services Ltd | Professional & scientific | 2025 |
| Acctech Limited | Professional & scientific | 2018 |
| Acculearn Training Ltd. | Education | 2010 |
| Accurate Lifts Limited | Manufacturing | 2008 |
| Accutax Consultants Ltd | Professional & scientific | 2013 |
| Accuwise Accountants Limited | Professional & scientific | 2024 |
| Ace Accountants & Tax Consultants Ltd | Professional & scientific | 2010 |
| Ace Accounting & Taxes Ltd | Professional & scientific | 2025 |
| Ace Business Club Ltd | Real estate | 2023 |
| Ace Business Consultancy Ltd | Professional & scientific | 2009 |
| Ace Cart Ltd | Wholesale & retail | 2025 |
| Ace Coffee Ltd | Other services | 2018 |
| Ace Couriers North East Ltd | Transport & logistics | 2018 |
| Ace Education Academy Limited | Education | 2016 |
| Ace Establishments Limited | Real estate | 2016 |
| Ace Exams Ltd | Information & communication | 2026 |
| Ace Fast Lets Ltd | Hospitality | 2015 |
| Ace Industries Ltd | Financial services | 2026 |
| Ace London School Limited | Education | 2023 |
| Ace Medlegal Limited | Health & social care | 2020 |
| Ace Parfums Limited | Administrative & support | 2014 |
| Ace Professionals (UK) Limited | Professional & scientific | 2011 |
| Ace Property Portfolio Limited | Real estate | 2024 |
| Ace Removals & Storage Ltd | Transport & logistics | 2020 |
| Ace Removals Limited | Transport & logistics | 2009 |
| Ace Resources Ltd | Water & waste | 2019 |
| Ace Runners Ltd | Transport & logistics | 2020 |
| Ace Sails Ltd | Wholesale & retail | 2025 |
| Ace Services Global Ltd | Information & communication | 2025 |
| Ace Technologies Limited | Information & communication | 2005 |
| Ace Visuals Ltd | Information & communication | 2024 |
| Acecrest Limited | Manufacturing | 2001 |
| ACENOX369 Ltd | Wholesale & retail | 2023 |
| Aces Trading Limited | Wholesale & retail | 2023 |
| Aceukmla Ltd | Education | 2025 |
| ACF Maintenance Limited | Construction | 2020 |
| ACG Basi Properties Ltd | Real estate | 2025 |
| ACG Defender Limited | Construction | 2023 |
| Acglucky Ltd | Wholesale & retail | 2024 |
| Achanna Limited | Information & communication | 2006 |
| Achieve Group Ltd | Administrative & support | 2018 |
| Achieve Teachers Ltd | Education | 2016 |
| Achyutaya Tech Limited | Information & communication | 2014 |
| Acithan Ltd | Wholesale & retail | 2026 |
| ACK Property Services Limited | Administrative & support | 2012 |
| Ackcore Ltd | Information & communication | 2023 |
| Acme Secure Ltd | Administrative & support | 2024 |
| Acme Securex Limited | Manufacturing | 2025 |
| Acme Solutions Essex Ltd | Construction | 2026 |
| Acmx Consulting Ltd | Professional & scientific | 2022 |
| Acolade Ltd | Financial services | 2016 |
| Acorn Beauty Limited | Other services | 2011 |
| Acorn Independent Care Services Ltd | Health & social care | 2023 |
| Acorn Security Services Limited | Administrative & support | 2018 |
| Acquire Estate Ltd | Real estate | 2023 |
| Acquired Cricklewood Limited | Real estate | 2025 |
| Acquired Hainault Limited | Real estate | 2024 |
| Acquired London Ltd | Real estate | 2016 |
| Acquired Woodford Limited | Real estate | 2024 |
| Acquisition Sprint Ltd | Professional & scientific | 2025 |
| Acr.Co Trans Limited | Transport & logistics | 2019 |
| Acre & Tweed Group Limited | Professional & scientific | 2019 |
| Acre 1181 Limited | Wholesale & retail | 2014 |
| Acreside Developments Limited | Real estate | 2025 |
| Acreside Limited | Wholesale & retail | 2022 |
| Acrestones Property Management Ltd | Households | 1996 |
| Acrofame Limited | Wholesale & retail | 1986 |
| Across Abroad Ltd | Education | 2026 |
| Across Borders Educare Ltd | Professional & scientific | 2020 |
| Acryptum Ltd | Information & communication | 2024 |
| ACS Consultants Group Ltd | Other services | 2017 |
| Actaa Consultants Ltd | Professional & scientific | 2016 |
| Actar Ellis Brown & Co (UK) Limited | Professional & scientific | 2010 |
| Acting Genius Limited | Administrative & support | 2022 |
| Action Vehicles Ltd | Administrative & support | 2020 |
| Active Bravo Ltd | Wholesale & retail | 2021 |
| Active Bureau Ltd | Information & communication | 2024 |
| Active Care Agency (UK) Ltd | Professional & scientific | 2021 |
| Active Consulting Group Ltd | Administrative & support | 2020 |
| Active Door Solutions Limited | Extraterritorial | 2016 |
| Active Fire Services Ltd | Other services | 2021 |
| Active Flip Ltd | Information & communication | 2011 |
| Active Health Support Services Limited | Health & social care | 2005 |
| Active IQ Wear Ltd | Manufacturing | 2024 |
| Active Nights Ltd | Real estate | 2024 |
| Active Property Services London Ltd | Professional & scientific | 2019 |
| Active Security Services Ltd | Administrative & support | 2019 |
| Acton Meat Supplies Ltd | Wholesale & retail | 2018 |
| Acumen Construction Group Ltd | Construction | 2018 |
| Acumen Development Group Ltd | Construction | 2018 |
| Acumen New Homes Limited | Real estate | 2022 |
| Acumen Realty Group Limited | Real estate | 2016 |
| Acumen Realty Hawks Ltd | Financial services | 2022 |
| Acumen Sea Ltd | Real estate | 2025 |
| Acumen UK Services Ltd | Information & communication | 2022 |
| Acumen UK Solutions Ltd | Real estate | 2016 |
| Acute Medical Associates Limited | Health & social care | 2018 |