| A.R.A Value Property Ltd | Construction | 2019 |
| A.S.Bell Limited | Construction | 2010 |
| A.S.E Decor Services Ltd | Construction | 2026 |
| A2 Pro Ltd | Construction | 2026 |
| A2B Property Services Ltd | Real estate | 2025 |
| A2MOTION Ltd | Information & communication | 2020 |
| A3C Healthcare Limited | Health & social care | 2026 |
| Aa&Ss Foods Ltd | Real estate | 2021 |
| Aakif & Co Ltd | Transport & logistics | 2016 |
| AB Homes Properties Ltd | Real estate | 2023 |
| AB Teamwork Construction Limited | Construction | 2016 |
| ABA Insurance Commercial Limited | Financial services | 2017 |
| Abbay Limited | Real estate | 2009 |
| Abbey Auction Rooms Ltd | Wholesale & retail | 2021 |
| Abbey View Physiotherapy Ltd. | Health & social care | 2012 |
| Abbott Heating Care Limited | Extraterritorial | 2021 |
| ABD Healthcare Services Limited | Administrative & support | 2022 |
| ABE Home Solutions Ltd | Real estate | 2023 |
| Abhunnoo Limited | Real estate | 2024 |
| Abinibi Photography UK Limited | Professional & scientific | 2023 |
| ABL Swim Limited | Arts & recreation | 2018 |
| Able Bathrooms Ltd | Construction | 2003 |
| Able Cable Electricians Ltd | Construction | 2016 |
| Able Industrial Group Limited | Manufacturing | 2025 |
| Abmedia Services Ltd | Manufacturing | 2020 |
| Abode 24 Ltd | Construction | 2022 |
| Abode First Development Limited | Construction | 2018 |
| Above ALL Garden Maintenance Limited | Households | 2023 |
| Academy of Cheese | Education | 2016 |
| Academy of Cheese (Development) Ltd | Education | 2018 |
| Accessible Care Services Limited | Health & social care | 2013 |
| Accs Technologies Limited | Information & communication | 2014 |
| Acctlon Invest Ltd | Real estate | 2025 |
| Acctlon Tax Ltd | Professional & scientific | 2020 |
| Accuwaste Environmental Ltd | Professional & scientific | 2021 |
| Ace Admin and Accounts Ltd | Administrative & support | 2026 |
| Ace Baits Ltd | Agriculture & fishing | 2024 |
| Ace Hits TCG Ltd | Wholesale & retail | 2025 |
| Ace Motion Logistics Ltd | Transport & logistics | 2026 |
| ACH Imports Ltd | Wholesale & retail | 2021 |
| Achieverplus Services Ltd | Administrative & support | 2026 |
| Achilles Holdings Limited | Financial services | 2020 |
| Achilles Medway (29) Limited | Financial services | 2020 |
| Achilles Medway (32) Limited | Financial services | 2020 |
| Achilles Properties Limited | Real estate | 2014 |
| ACK Accounting & Financial Services Limited | Professional & scientific | 2025 |
| ACM Woodworking Machines Ltd | Manufacturing | 2014 |
| ACR Construction Ltd | Construction | 2024 |
| Active Lifestyle Limited | Administrative & support | 2019 |
| Acudoc Limited | Health & social care | 2012 |
| AD Building Contractors Ltd | Construction | 2018 |
| AD Care Services Ltd | Health & social care | 2019 |
| ADA Park Limited | Real estate | 2022 |
| Adam B Services Limited | Construction | 2011 |
| Adam GUY Painting & Decorating Limited | Construction | 2011 |
| Adams Motor Repairs Ltd | Wholesale & retail | 2018 |
| Adams Mots Ltd | Wholesale & retail | 2014 |
| Adapt Property Management Limited | Real estate | 2020 |
| ADE TC Cleaning Ltd | Administrative & support | 2019 |
| Adeks-Bryte Solutions Limited | Information & communication | 2023 |
| Adenosh Limited | Health & social care | 2019 |
| Adept Electronic Services Limited | Manufacturing | 2016 |
| Adept NDT & Weld Inspection Ltd | Professional & scientific | 2017 |
| Ades Auto Services Ltd | Wholesale & retail | 2024 |
| Adewog Services Ltd | Administrative & support | 2020 |
| Adexa Clinical and Aesthetics Ltd | Health & social care | 2026 |
| ADI Computer Services Limited | Information & communication | 2011 |
| ADI DIR Building Ltd | Water & waste | 2022 |
| Adior Construction Ltd | Construction | 2020 |
| Adler Consults Limited | Information & communication | 2024 |
| Admiralty Gate Limited | Households | 2013 |
| Adonai Studios Ltd | Wholesale & retail | 2024 |
| ADR Electrical Solutions Ltd | Construction | 2012 |
| Adrilex Ltd | Transport & logistics | 2019 |
| ADS Car Sales Ltd | Wholesale & retail | 2023 |
| ADS Consult Services Ltd | Mining & quarrying | 2025 |
| ADSPRODUCTION395 Limited | Professional & scientific | 2024 |
| Adurocks Ltd | Real estate | 2026 |
| Advanced Beauty Aesthetics Ltd | Other services | 2022 |
| Advanced Electrical Services Ltd | Construction | 2019 |
| Advanced Healthcare Computing Limited | Information & communication | 1990 |
| Advanced Ophthalmic Support Limited | Health & social care | 2024 |
| ADY Kent Ltd | Administrative & support | 2016 |
| AE Home Ltd | Real estate | 2013 |
| AEG Refurbishments Limited | Construction | 2019 |
| Aegis of Athena Ltd | Manufacturing | 2021 |
| Aemb Limited | Real estate | 2019 |
| Aerial Solutions (South East) Limited | Construction | 2010 |
| AF Catering Ltd | Hospitality | 2019 |
| Affinity Services Ltd | Wholesale & retail | 2022 |
| Affordable Building Services Limited | Real estate | 2020 |
| Afoor Properties Limited | Real estate | 2020 |
| African Solidarity C.I.C. | Other services | 2025 |
| Afrikan Glory Ltd | Wholesale & retail | 2022 |
| Afrofeast Cusine Limited | Hospitality | 2024 |
| Afrom Limited | Health & social care | 2013 |
| Afrosupply Hub Ltd | Wholesale & retail | 2025 |
| Afterlight Limited | Administrative & support | 2014 |
| Agapeo Love International Ministries Limited | Extraterritorial | 2020 |
| Agilit.Ai Ltd | Information & communication | 2026 |