| A J Carpentry Kent Limited | Construction | 2018 |
| A J Colley Ltd | Construction | 2024 |
| A J K Projects Ltd | Construction | 2020 |
| A Lincoln Limited | Information & communication | 2024 |
| A M 1 Projects Ltd | Construction | 2011 |
| A M D Flooring Ltd | Construction | 2021 |
| A One Vinyl and Sign Supplies Limited | Wholesale & retail | 2024 |
| A P & Partners Legal Advice and Consultancy Ltd | Professional & scientific | 2026 |
| A P & Partners Legal Advice Ltd | Professional & scientific | 2026 |
| A Plus Dynamics Recruitment Ltd | Administrative & support | 2022 |
| A Plus O Consultancy Limited | Real estate | 2017 |
| A Plus O Properties Limited | Real estate | 2021 |
| A Plusy Property Ltd | Real estate | 2024 |
| A Recovery Limited | Transport & logistics | 2024 |
| A Reinforcement Ltd | Construction | 2019 |
| A S Cook Carpentry and Building Services Limited | Construction | 2018 |
| A Star Tyre & Car Wash Ltd | Wholesale & retail | 2024 |
| A Viron Ltd | Construction | 2016 |
| A&A Luxestate Limited | Real estate | 2024 |
| A&A Plumbing Heating and GAS Services Ltd | Construction | 2023 |
| A&I Living Ltd | Real estate | 2025 |
| A&T Recruitment Solutions Ltd | Administrative & support | 2025 |
| A&Z Archery Limited | Wholesale & retail | 2025 |
| A-Z Home to Home Properties Ltd | Real estate | 2022 |
| A.D.K (Plant) Services Limited | Administrative & support | 2012 |
| A.D.L Building Services Ltd | Other services | 2016 |
| A.E. Ford Electrical Services Limited | Professional & scientific | 2007 |
| A.J.S. Site Services Limited | Construction | 2007 |
| A.N.R. Developments Limited | Construction | 1998 |
| A.O.O Care Services Limited | Health & social care | 2023 |
| A.Q. Services Limited | Construction | 2004 |
| A.S Cleaning Group Limited | Other services | 2020 |
| A1 Healthcare Solutions Ltd | Health & social care | 2020 |
| A1 Homecare Group Ltd | Construction | 2026 |
| A1 Launderette & DRY Cleaning Limited | Other services | 2019 |
| A1 Works Ltd | Real estate | 2023 |
| A2 Mini Coaches Limited | Transport & logistics | 2018 |
| A212 Electric & GAS Ltd | Construction | 2021 |
| A2CARPENTERS Ltd | Construction | 2018 |
| A2Z Medical Consultancy Ltd | Health & social care | 2018 |
| AA Cleaning & Building Maintenance Limited | Administrative & support | 2025 |
| AA Consultancy & Manpower Ltd | Administrative & support | 2022 |
| AA Genuine Limited | Health & social care | 2022 |
| AAA Credit Ltd | Extraterritorial | 2015 |
| AAA Intelligent Solutions Ltd | Information & communication | 2014 |
| AAA LUX Travel Ltd | Transport & logistics | 2025 |
| AAA Properties (Kent) Ltd | Real estate | 2024 |
| AAF Building & Decorating Services Limited | Construction | 2000 |
| AAK Smile Limited | Health & social care | 2026 |
| AAMEEN2CARES Ltd | Health & social care | 2022 |
| Aargents Construction UK Ltd | Construction | 2011 |
| Aayesha Pharma Ltd | Other services | 2023 |
| AB & M Co Ltd | Construction | 2025 |
| AB NDT Ltd | Construction | 2026 |
| Abalone Property Advisory Ltd | Real estate | 2026 |
| Abalone Stays Ltd | Hospitality | 2025 |
| Abarak Resources Limited | Information & communication | 2024 |
| Abayomi Limited | Administrative & support | 2024 |
| Abba Hi-Tech Limited | Wholesale & retail | 1988 |
| Abba-Fortune Limited | Hospitality | 2024 |
| Abbas Security Systems Limited | Administrative & support | 2018 |
| Abbyglitzx Limited | Other services | 2025 |
| ABC Networks Limited | Other services | 2013 |
| ABC Taxis (Kent) Limited | Transport & logistics | 2009 |
| Abccia Limited | Professional & scientific | 2018 |
| ABE Installs Ltd | Construction | 2024 |
| ABH Management LLP | | 2018 |
| Abhaile Insight Ltd | Health & social care | 2024 |
| Abhigna Infotech Private Limited | Information & communication | 2023 |
| ABI Food & Wine Ltd | Wholesale & retail | 2024 |
| ABI Wine Ltd | Wholesale & retail | 2019 |
| Abiosu & Co Limited | Health & social care | 2022 |
| Abishel Accounting Ltd | Professional & scientific | 2021 |
| Abishel PVT Ltd | Wholesale & retail | 2017 |
| Abiskills Limited | Construction | 2022 |
| ABL123 Limited | Professional & scientific | 2015 |
| Able Hands Healthcare Ltd | Health & social care | 2022 |
| Able Mabel Crafts Limited | Wholesale & retail | 2014 |
| Ablestoke Financial Advisers Limited | Financial services | 2011 |
| Ablestoke Financial Planning LLP | | 2011 |
| Ablestoke Group Limited | Financial services | 2019 |
| Ablestoke Limited | Financial services | 2008 |
| Ablestoke Wealth Management Limited | Financial services | 2008 |
| Aboki Suya Lounge Ltd | Hospitality | 2025 |
| Absolute Homes Ltd | Real estate | 2026 |
| Abtax Consultancy Services (UK) Limited | Professional & scientific | 2005 |
| Abundance TEC Ltd | Health & social care | 2022 |
| Abusquo’S BBQ Ltd | Wholesale & retail | 2023 |
| Aby's Kitchen Ltd | Hospitality | 2024 |
| Abyme Ltd | Other services | 2018 |
| AC Entertainment Limited | Arts & recreation | 2018 |
| AC Law Ltd | Professional & scientific | 2025 |
| AC Project Services Limited | Professional & scientific | 2008 |
| Academy Education Network International Ltd | Education | 2024 |
| Academy Education Network Limited | Education | 2024 |
| Academy of Professional Developing Ltd | Education | 2024 |
| Accent on Type Limited | Professional & scientific | 1989 |
| Access and Rescue Solutions Ltd | Education | 2014 |
| Access Plant Transport Ltd | Transport & logistics | 2025 |
| Accolaide Surveyors Limited | Professional & scientific | 2011 |