| Accuro Logistics Limited | Transport & logistics | 2003 |
| Ace Business Solutions Italy Limited | Information & communication | 2015 |
| Ace Garden Services Limited | Other services | 2003 |
| Ace Miller Limited | Professional & scientific | 2025 |
| Acecloud Limited | Real estate | 2021 |
| Acefree Ltd | Professional & scientific | 1999 |
| Aceharland Ltd | Real estate | 2024 |
| Achenar Consulting Ltd | Professional & scientific | 2021 |
| Achenar Investments LLP | | 2021 |
| Acir Limited | Professional & scientific | 2019 |
| ACK Trading Ltd | Wholesale & retail | 2017 |
| Ackers Property Ltd | Real estate | 2020 |
| ACM Logistics Limited | Transport & logistics | 2015 |
| Acme Construction Group Limited | Construction | 2024 |
| Acme Value Management Limited | Financial services | 2016 |
| ACN 1 Limited | Hospitality | 2025 |
| Acorn & Steel Ltd | Real estate | 2026 |
| Acorn Global Partners Ltd | Professional & scientific | 2016 |
| Acre (Chancery) Limited | Real estate | 2016 |
| Acre 1162 (Shell T) Limited | Administrative & support | 2013 |
| Acre 1219 Limited | Financial services | 2019 |
| Acre Construction Ltd | Construction | 2017 |
| Acre GL Mountain (Sunset) Limited | Financial services | 2016 |
| Acredean Limited | Professional & scientific | 2024 |
| ACS Building & Constructions Ltd | Construction | 2021 |
| Action Medical Services Limited | Health & social care | 2013 |
| Active Retail Merchandising Services Limited | Administrative & support | 2010 |
| Acton Carpark Limited | Hospitality | 2025 |
| Acuity Selective Finance Limited | Financial services | 2011 |
| AD Property Construction Limited | Construction | 2019 |
| Adam Building & Maintenance Ltd | Construction | 2013 |
| Adam DOE Props Ltd | Information & communication | 2016 |
| Adam Fahn and Co Limited | Information & communication | 2013 |
| Adam KAY Chiropractic Limited | Health & social care | 2011 |
| Adam LEE Developments Limited | Construction | 2021 |
| Adam LEE Property Maintenance Ltd | Construction | 2016 |
| Adam Regent Public House Ltd | Hospitality | 2015 |
| Adama Consultants Ltd | Information & communication | 2015 |
| Adaptacraft Limited | Wholesale & retail | 1965 |
| ADC Europe Limited | Professional & scientific | 2018 |
| Addapta Solutions Limited | Professional & scientific | 2009 |
| Adencloud Limited | Health & social care | 2019 |
| Adept Decor Films Ltd | Construction | 2021 |
| ADH Property Holdings (London) Limited | Financial services | 2026 |
| Adhq Ltd | Professional & scientific | 2024 |
| Adhrit Consultancy Services UK Ltd | Information & communication | 2018 |
| ADI Consultancy Limited | Information & communication | 2008 |
| Adic Flooring Ltd | Construction | 2022 |
| Adivahs London Limited | Hospitality | 2024 |
| Adjei-Amoah Ltd | Extraterritorial | 2023 |
| ADK & JG Properties Limited | Real estate | 2020 |
| ADK & JG Rental Management Limited | Real estate | 2023 |
| ADL Building Ltd | Construction | 2023 |
| Adley Facilities LLP | | 2016 |
| ADM Medical Care Ltd | Health & social care | 2021 |
| Admirals Court Residents Limited | Households | 1995 |
| Adrian Interiors Ltd | Construction | 2017 |
| Adrican Building Services Ltd | Construction | 2003 |
| ADS Business Solutions Ltd | Information & communication | 2016 |
| Adtil Limited | Real estate | 2013 |
| Advanced Medicals Ltd | Health & social care | 2015 |
| Advanced Systems London Ltd | Other services | 2013 |
| Advanced Thermal Applications Limited | Construction | 2022 |
| Advanced Thinking Resources Limited | Information & communication | 2024 |
| Advanced Thinking Tuition Limited | Education | 2020 |
| Advantage Capital Ltd | Financial services | 2023 |
| Adveniunt Medical International Limited | Health & social care | 2009 |
| AEA1 Ltd | Construction | 2024 |
| Aedp LLP | | 2025 |
| AEJ Ventures Ltd | Hospitality | 2023 |
| Aeni's Design Studio Limited | Wholesale & retail | 2019 |
| Aeolian Finance (UK) Ltd | Professional & scientific | 2011 |
| Aeolus Yachts Limited | Manufacturing | 2023 |
| Aerial Empire Ltd | Construction | 2014 |
| Aero Waste Services Limited | Administrative & support | 2022 |
| Aeroline Executive Transfers Ltd | Transport & logistics | 2026 |
| Aeroqms Ltd. | Information & communication | 2009 |
| Aesthetic Network Limited | Health & social care | 2024 |
| AEX Ventures Limited | Real estate | 2026 |
| AF Photography Limited | Professional & scientific | 2018 |
| Afal Limited | Information & communication | 2010 |
| Afas Debtco Limited | Financial services | 2021 |
| Afas Midco Limited | Financial services | 2021 |
| Afas the Core Limited | Financial services | 2021 |
| Affordable Rads Ltd | Wholesale & retail | 2021 |
| Affy Construction Ltd | Construction | 2014 |
| Affy Maintenance and Repairs Ltd | Construction | 2024 |
| Afghan Bazaar Limited | Wholesale & retail | 2013 |
| Afinn Limited | Professional & scientific | 2024 |
| African Energy Ltd | Financial services | 2023 |
| Afters Supplies Ltd | Hospitality | 2008 |
| AGA Decorating Ltd | Construction | 2015 |
| Agabria Maritime Limited | Administrative & support | 2023 |
| Agaete Ltd | Other services | 2016 |
| Against ALL Odds 78 Ltd | Health & social care | 2026 |
| AGAPÉ4ALL Foods Limited | Wholesale & retail | 2024 |
| AGAPÉ4ALL Property Limited | Information & communication | 2022 |
| Agate Marketing Limited | Professional & scientific | 2012 |
| Agdesign-Build Ltd | Professional & scientific | 2020 |
| Agewage Limited | Administrative & support | 2018 |