| Abbots Court (Stafford) Limited | Real estate | 2019 |
| ABC (Beaconsfield) Ltd | Hospitality | 2020 |
| ABC (Chequers) Ltd | Hospitality | 2020 |
| ABC (G MAN) Ltd | Hospitality | 2020 |
| ABC (Hibbert) Ltd | Hospitality | 2020 |
| ABC (Leather) Ltd | Hospitality | 2020 |
| ABC (Mariner) Ltd | Hospitality | 2020 |
| ABC (Monken) Ltd | Hospitality | 2020 |
| ABC (Nambucca) Ltd | Hospitality | 2020 |
| ABC (One Crown) Ltd | Hospitality | 2020 |
| ABC (Pheasant) Ltd | Hospitality | 2020 |
| ABC (Railway) Ltd | Hospitality | 2020 |
| ABC (the Well) Ltd | Hospitality | 2020 |
| ABC (Willam) Ltd | Hospitality | 2020 |
| ABC Diesels Ltd | Extraterritorial | 2021 |
| ABC Inn Group Ltd | Real estate | 2022 |
| ABC Power Limited | Professional & scientific | 2020 |
| ABC Power Solutions Ltd | Manufacturing | 2003 |
| ABC PUB5 Ltd | Hospitality | 2019 |
| Abdp Home Limited | Real estate | 2026 |
| Abhyudaya Estates Limited | Real estate | 2026 |
| Able Power PTE Ltd | Extraterritorial | 2016 |
| Abode (Midlands) Limited | Real estate | 2003 |
| Abode Automation Limited | Construction | 2016 |
| Abode Estate Agents Limited | Real estate | 2014 |
| Abode New Homes Ltd | Construction | 2023 |
| Abrar Trading Company Ltd | Wholesale & retail | 2025 |
| Absence Management Applied Resolutions Ltd | Health & social care | 2017 |
| Absolute Ultrasound Limited | Health & social care | 2025 |
| ABT Electrical Services Ltd | Construction | 2025 |
| AC (Penkridge) Limited | Professional & scientific | 2015 |
| AC Snooker Ltd | Manufacturing | 2026 |
| Academy of High Achievers Ltd | Administrative & support | 2004 |
| Academyclub CIC | Education | 2019 |
| Acadia Support Services Limited | Other services | 2014 |
| Acce Investment Ltd | Wholesale & retail | 2021 |
| Access Assured Locksmiths Limited | Administrative & support | 2021 |
| Accolade Workspace Ltd | Manufacturing | 2017 |
| Ace Padel 1 Limited | Arts & recreation | 2025 |
| Ace Padel 2 Limited | Arts & recreation | 2025 |
| Ace Padel Limited | Arts & recreation | 2024 |
| Ace Property Care Limited | Construction | 2025 |
| Ace Property Lettings Limited | Real estate | 1998 |
| Acer Garden Landscapes Limited | Administrative & support | 2001 |
| Achieve Beyond Schools Limited | Education | 2025 |
| Achieve Holding Group Limited | Financial services | 2025 |
| Achrise Ltd | Wholesale & retail | 2025 |
| ACM Trade Ltd | Wholesale & retail | 2017 |
| Acorns Motorcycle Club Limited | Arts & recreation | 2009 |
| ACP Architecture Limited | Professional & scientific | 2008 |
| ACP Industry Co., Ltd | Extraterritorial | 2016 |
| Acpd Ltd | Households | 2023 |
| Acquire & Integrate International Limited | Professional & scientific | 2019 |
| Acquire & Integrate Limited | Professional & scientific | 2018 |
| Acre Research Limited | Information & communication | 2021 |
| Acrolein Ltd | Transport & logistics | 2022 |
| Activ-Tec Limited | Wholesale & retail | 2016 |
| ACTIV7 Ltd | Transport & logistics | 2019 |
| Active Athlete Limited | Arts & recreation | 2017 |
| Active Chiropractic & Wellness Centre Ltd | Health & social care | 2017 |
| Active Energy Assessors Limited | Professional & scientific | 2006 |
| Active Food Group Limited | Wholesale & retail | 2018 |
| Active Weed Control Limited | Other services | 1999 |
| Acton Design Partnership Limited | Administrative & support | 2008 |
| Acton Gate Enterprises Limited | Real estate | 2009 |
| Acton Group Estates Ltd | Real estate | 2026 |
| Acton Group Ltd | Financial services | 2017 |
| Acton Moat Limited | Real estate | 2019 |
| Acton Relocation Management Ltd | Administrative & support | 2013 |
| Acton Ridge Ltd | Administrative & support | 2012 |
| Acton Stone Ltd | Construction | 2025 |
| Acts Health Care Ltd | Health & social care | 2016 |
| AD 2441 Ltd | Real estate | 2019 |
| AD Barton Ltd | Construction | 2012 |
| Adam Williams Electrical Limited | Construction | 2022 |
| Adam's Acre Ltd | Other services | 2025 |
| Adamandellie Ltd | Information & communication | 2025 |
| Adams Cars Ltd | Wholesale & retail | 2022 |
| Adams Consultancy & Management Limited | Administrative & support | 2010 |
| Adapt Education Group Limited | Education | 2026 |
| Adapt Education Staffordshire Ltd | Education | 2023 |
| ADD Skills Limited | Professional & scientific | 2018 |
| Addmaster Holdings Limited | Professional & scientific | 2004 |
| ADE Adams Joinery & Roofing Ltd | Construction | 2025 |
| Adeeg International Trading Co., Ltd | Wholesale & retail | 2025 |
| Adenzai Ltd | Real estate | 2022 |
| Adept Business Consultancy Limited | Administrative & support | 1992 |
| Adlam Consultancy Services Limited | Professional & scientific | 2019 |
| Adou International Trading Company Limited | Wholesale & retail | 2026 |
| Adrian White Wealth Management Limited | Financial services | 2022 |
| Adspark London ADS Ltd | Professional & scientific | 2025 |
| Advanced Ceramics Limited | Manufacturing | 2001 |
| Advanced Land Clearance Services Limited | Other services | 2023 |
| Advanced Metal Recycling Ltd | Wholesale & retail | 2019 |
| Advanced Shipping Limited | Transport & logistics | 2024 |
| Advanced Upvc & Aluminium Ltd | Construction | 2019 |
| Adventure Street (Dudley) Ltd | Health & social care | 2023 |
| Advservice Limited | Wholesale & retail | 2016 |
| Advtech Solution Limited | Professional & scientific | 2016 |
| AE Electronics Limited | Professional & scientific | 2003 |