| Autobasil Car Body Repairs Ltd | Wholesale & retail | 2023 |
| Autobrid Ltd | Administrative & support | 2025 |
| Autocabops Ltd | Information & communication | 2024 |
| Autograph Electrics Ltd | Construction | 2022 |
| Automated Document Processing Ltd | Information & communication | 2024 |
| Automotive Alliance Limited | Transport & logistics | 2012 |
| Automotive Gray Modelling Ltd | Professional & scientific | 2021 |
| AV Accountancy Ltd | Professional & scientific | 2015 |
| AV Vending Ltd | Wholesale & retail | 2025 |
| AVA Leisure (Vehicles) Limited | Wholesale & retail | 2000 |
| Avangul Ltd | Wholesale & retail | 2025 |
| Avani Global Ltd | Real estate | 2024 |
| Avatan Ltd | Construction | 2019 |
| AVE Maria Coaching Ltd | Other services | 2025 |
| Avem Property Holdings Ltd | Real estate | 2026 |
| Avensys Limited | Wholesale & retail | 2000 |
| Avesco Services Limited | Professional & scientific | 1988 |
| AVIA1 Ltd | Wholesale & retail | 2024 |
| Aviansh Properties Ltd | Real estate | 2024 |
| Aviation House Ltd | Real estate | 2025 |
| Aviation Repair Centre Limited | Education | 2026 |
| Aviation Training Centre Limited | Education | 2026 |
| Aviator 2015 Ltd | Real estate | 2014 |
| Avico UK Ltd | Transport & logistics | 2024 |
| Avidred Ltd | Wholesale & retail | 2019 |
| Avighna Consulting Limited | Information & communication | 2011 |
| Avionics Support Properties Ltd | Real estate | 2024 |
| Avionics Support Sales Limited | Transport & logistics | 2015 |
| AVJ Automotive Ltd | Wholesale & retail | 2025 |
| AVN Cluster UK Ltd | Wholesale & retail | 2022 |
| AVR Properties Limited | Real estate | 2013 |
| Avril Poole Ltd | Arts & recreation | 2016 |
| Avron Contractors Limited | Wholesale & retail | 1989 |
| Avwill Limited | Health & social care | 2013 |
| Avwill Properties Limited | Real estate | 2026 |
| AW Limited | Extraterritorial | 1966 |
| Awamaridi Holdings Ltd | Real estate | 2017 |
| Award Consulting Limited | Administrative & support | 2004 |
| AWM Clearance Limited | Water & waste | 2025 |
| Axcel Holding Limited | Hospitality | 2024 |
| AXE Consultancy and Services Ltd | Real estate | 2019 |
| Axeion Holdings Ltd | Wholesale & retail | 2025 |
| Axia Fans Limited | Manufacturing | 1970 |
| Axis Cars Crawley Ltd | Transport & logistics | 2025 |
| Axxine Limited | Information & communication | 2025 |
| Ayads Ltd | Wholesale & retail | 2019 |
| Ayeetreats Limited | Wholesale & retail | 2025 |
| AYH Baby Ltd | Wholesale & retail | 2025 |
| Ayka Property Investments Limited | Real estate | 2020 |
| Aylesbury Cheerleading Academy | Arts & recreation | 2018 |
| Aylesbury Cheerleading Academy Trading Limited | Wholesale & retail | 2024 |
| Ayok Consultancy Limited | Professional & scientific | 2013 |
| Ayoke Ltd | Wholesale & retail | 2025 |
| Ayub MED Ltd | Health & social care | 2022 |
| Ayushivaay Ltd | Wholesale & retail | 2025 |
| AZ Commercial Ltd | Administrative & support | 2025 |
| AZ Ecom Ltd | Professional & scientific | 2024 |
| AZ Jobs Ltd | Construction | 2024 |
| AZ Supply Ltd | Wholesale & retail | 2021 |
| Azad Global Care Ltd | Health & social care | 2026 |
| Azano Ltd | Wholesale & retail | 2022 |
| Azaro Group Ltd | Hospitality | 2013 |
| Azeem's Travel Limited | Transport & logistics | 2025 |
| Aziz Auto Repair Centre Ltd | Wholesale & retail | 2022 |
| Azurezenity Ltd | Other services | 2023 |
| AZZ Enterprise Ltd | Wholesale & retail | 2025 |
| B & C E Financial Services Limited | Extraterritorial | 2016 |
| B & C Electrical Solutions Limited | Construction | 2018 |
| B a Transportations Ltd | Transport & logistics | 2023 |
| B Beautiful by Binita Ltd | Health & social care | 2024 |
| B&C Business Support Ltd | Administrative & support | 2021 |
| B&Ce Holdings Limited | Extraterritorial | 2021 |
| B&I Property Limited | Real estate | 2025 |
| B&W Properties Limited | Households | 2025 |
| B.A. Eastwell Property Company Limited | Construction | 1980 |
| B.Art Electrical Ltd | Construction | 2021 |
| B.E.T. Building Services Limited | Extraterritorial | 1984 |
| B.G.L Property Services Limited | Construction | 2018 |
| B.H.O.S.S Microsystems Limited | Manufacturing | 1990 |
| B.P. Installations Limited | Construction | 2000 |
| B4BAKKALI Ltd | Hospitality | 2020 |
| Baba 2 Store Ltd Ltd | Wholesale & retail | 2026 |
| Baba Abode Ltd | Real estate | 2018 |
| Baba Couriers Ltd | Transport & logistics | 2023 |
| Babang Media Ltd | Other services | 2017 |
| Babcock Energy Limited | Manufacturing | 1974 |
| Babiha Care Solutions Limited | Information & communication | 2026 |
| Bablys EYE Brow Baar Ltd | Other services | 2025 |
| Baby Sensory Sevenoaks Limited | Education | 2017 |
| Babycomfort Zone Limited | Wholesale & retail | 2023 |
| BAC Electrical (West Sussex) Ltd | Construction | 2010 |
| Backend Tech Ltd | Information & communication | 2019 |
| BAD Moon Design Ltd | Professional & scientific | 2025 |
| Badgers Copse (Copthorne) Management Company Limited | Households | 2009 |
| BAG Art Ltd | Wholesale & retail | 2025 |
| Bahoz Cafe Limited | Hospitality | 2026 |
| Bailey Construction Copthorne LLP | | 2011 |
| Bainstani Ltd | Other services | 2018 |
| BAJWA97 Limited | Transport & logistics | 2024 |
| Bakeberry Ltd | Hospitality | 2018 |