| ABC Renovation Projects Ltd | Administrative & support | 2026 |
| Abex Systems Limited | Information & communication | 1994 |
| Abike Global Limited | Manufacturing | 2025 |
| Ability Outlet Limited | Wholesale & retail | 2008 |
| Abim Health Care Services Limited | Health & social care | 2015 |
| ABM Multisector Ltd | Wholesale & retail | 2021 |
| Abode Heating Services Ltd | Construction | 2021 |
| Abode Renovation Faversham Ltd | Construction | 2013 |
| Above the Norm Beauty Limited | Other services | 2021 |
| ABR Trans Limited | Transport & logistics | 2018 |
| Abraham Management Limited | Professional & scientific | 2022 |
| Abraham Mercy Ltd | Wholesale & retail | 2025 |
| ABS Scaffolding Ltd | Construction | 2025 |
| Absolute Gases Limited | Manufacturing | 2020 |
| Abtax CA Limited | Professional & scientific | 2006 |
| Academy Finance Limited | Professional & scientific | 2016 |
| Accertum Ltd | Professional & scientific | 2018 |
| Access Paper Ltd | Wholesale & retail | 2005 |
| Accesslink Health CIC | Public administration | 2026 |
| Acclaimed Property Solutions Limited | Real estate | 2025 |
| Acclaimed Services Limited | Financial services | 2019 |
| Accolade Lifts Ltd | Manufacturing | 2021 |
| Accord Staffing Ltd | Administrative & support | 2025 |
| Accountants Team Limited | Administrative & support | 2023 |
| Accounting & Taxation Ltd | Professional & scientific | 2023 |
| Accounting Value 4U Limited | Professional & scientific | 2006 |
| Accounts and Bookkeeping Services Ltd | Professional & scientific | 2025 |
| Ace Hydraulics Holdings Ltd | Financial services | 2020 |
| Ace Hydraulics Ltd | Manufacturing | 2011 |
| Ace Online Accounting Ltd | Professional & scientific | 2025 |
| Ace UK Couriers Limited | Transport & logistics | 2022 |
| ACG Lettings Limited | Real estate | 1995 |
| Acheson Attachment Hire Ltd | Administrative & support | 2014 |
| Acho Consultancy Ltd | Professional & scientific | 2025 |
| Acmud Private Ltd | Real estate | 2020 |
| ACP South East Ltd | Health & social care | 2022 |
| Acre Consultants Limited | Information & communication | 2001 |
| Acreplan Properties Limited | Real estate | 2007 |
| ACS Imaging Ltd | Manufacturing | 2009 |
| Active Physical Therapy Ltd | Health & social care | 2023 |
| Activeplay Nurseries Limited | Education | 2001 |
| Ada's Pies Ltd | Hospitality | 2021 |
| Adam Green Media Ltd | Professional & scientific | 2025 |
| Adam, Rouilly Limited | Manufacturing | 1971 |
| Adamra Ltd | Transport & logistics | 2022 |
| Adco Secure Ltd | Administrative & support | 2019 |
| Addaura Limited | Professional & scientific | 2003 |
| Ade's Couriers Ltd | Transport & logistics | 2023 |
| Adept Training Solutions Limited | Information & communication | 2025 |
| Adiadrian Limited | Transport & logistics | 2017 |
| Admx Ltd | Professional & scientific | 2024 |
| ADS Executive Chauffeurs Ltd | Transport & logistics | 2024 |
| Aduke Limited | Wholesale & retail | 2018 |
| Adumis Ltd | Construction | 2020 |
| Advance Medical Transport Services Limited | Health & social care | 2016 |
| Advance Training and Consulting Ltd | Information & communication | 2022 |
| Advanced Industries Strategic Resources Limited | Professional & scientific | 2024 |
| Advanced Signalling Associates Ltd | Transport & logistics | 2019 |
| Advantage Autos Ltd | Wholesale & retail | 2025 |
| Aeolus Air Limited | Construction | 2026 |
| Aera Smile Ltd | Health & social care | 2025 |
| Aerobic Trading Ltd | Wholesale & retail | 2019 |
| Aerotech Solutions Ltd | Manufacturing | 2007 |
| AF Electrical Contractors Limited | Construction | 2013 |
| AFA Property Investments Ltd | Real estate | 2021 |
| Afemid Services Limited | Administrative & support | 2015 |
| Affluent Group Homes Limited | Real estate | 2026 |
| Afrigoal Services Limited | Professional & scientific | 2018 |
| AG Family Homes Limited | Real estate | 2024 |
| Agabb Ltd | Wholesale & retail | 2024 |
| Aghappe Limited | Information & communication | 2014 |
| Aghappe Properties 2 Limited | Real estate | 2025 |
| Aghappe Properties Limited | Real estate | 2017 |
| Agile-Dev Services Ltd | Information & communication | 2024 |
| Agleam Properties Limited | Real estate | 2022 |
| Agma Consulting Ltd | Information & communication | 2026 |
| Agrenk Care Limited | Health & social care | 2025 |
| Agripack Limited | Administrative & support | 2017 |
| Agrovest Ltd | Agriculture & fishing | 2011 |
| Agunpopp TM Ltd | Construction | 2024 |
| AH Fire & Electrical Services Ltd | Construction | 2026 |
| AH Services (Kent) Limited | Energy | 2007 |
| AH Tunnelling Limited | Construction | 2017 |
| AHA & Brothers Ltd | Real estate | 2026 |
| AI Build Group Ltd | Information & communication | 2026 |
| AI Radiography Solutions Ltd | Health & social care | 2024 |
| Aida Grill House Ltd | Hospitality | 2021 |
| Aiden Rayan Limited | Hospitality | 2023 |
| AIM Hire Centres Limited | Administrative & support | 1999 |
| Airport Transfers Kent Limited | Transport & logistics | 2019 |
| AJ Fine Foods & Drinks Ltd | Wholesale & retail | 2026 |
| AJ Star Consultancy Limited | Professional & scientific | 2025 |
| AJ Sterling Limited | Health & social care | 2022 |
| Ajax Digital Ltd | Information & communication | 2024 |
| AJE Properties Ltd | Real estate | 2018 |
| AJF Care Solutions Limited | Extraterritorial | 2016 |
| AJH Coatings Ltd | Other services | 2014 |
| Ajisho Ltd | Information & communication | 2018 |
| AJK Security Services Ltd | Administrative & support | 2021 |
| Ajt&T Accountant Limited | Professional & scientific | 2025 |