| At-Rack Ltd | Administrative & support | 2023 |
| Atej Properties Limited | Real estate | 2023 |
| ATF Dubier Ltd | Administrative & support | 2024 |
| Atif & Sons Ltd | Other services | 2017 |
| ATJ Traders Ltd | Wholesale & retail | 2026 |
| Atlantic Groundwork Ltd | Administrative & support | 2022 |
| Atlas Direct Mail Ltd | Professional & scientific | 2007 |
| Atlas Security Solutions Limited | Professional & scientific | 2025 |
| Atoz Inventory Marketplace Trading Ltd | Wholesale & retail | 2025 |
| ATP Projects Ltd | Manufacturing | 2013 |
| Atticus Trading Ltd | Wholesale & retail | 2021 |
| AU Risk Management Ltd | Administrative & support | 2024 |
| AU Stores UK Limited | Wholesale & retail | 2022 |
| Augmentable Marketing Limited | Professional & scientific | 2016 |
| Aura Cleaning NKS Ltd | Administrative & support | 2025 |
| Aura Enterprise Smne Ltd | Construction | 2025 |
| Aura Inventory Limited | Other services | 2025 |
| Aura Jeans London Ltd | Wholesale & retail | 2025 |
| Auracoreuk Ltd | Wholesale & retail | 2026 |
| Auto Body Expert Limited | Wholesale & retail | 2010 |
| Auto Edocs Ltd | Information & communication | 2019 |
| Auto V MOT Ltd | Wholesale & retail | 2025 |
| Autobyte Ltd | Professional & scientific | 2021 |
| Autologik Repairs Ltd | Wholesale & retail | 2023 |
| AV & Family Ltd | Wholesale & retail | 2021 |
| Avalon IT Developments Limited | Information & communication | 2022 |
| Avance Digital Ltd | Information & communication | 2026 |
| Aveley Building & Construction Ltd | Construction | 2013 |
| Axelerate Business Services Ltd | Professional & scientific | 2023 |
| Axis Design & Build Limited | Professional & scientific | 2016 |
| Ayanko Ltd | Real estate | 2020 |
| Ayco Ltd | Construction | 2015 |
| Ayling & Sons Roofing Limited | Construction | 2013 |
| Ayling Prestige Renovation Ltd | Construction | 2014 |
| Aysar Homes Limited | Real estate | 2024 |
| Ayyaz Homes (ASH Grove) Limited | Real estate | 2020 |
| Azpirar Limited | Professional & scientific | 2015 |
| Azure Aduku Ltd | Wholesale & retail | 2017 |
| B & B Store Ltd | Wholesale & retail | 2017 |
| B & D Manufacturing Limited | Extraterritorial | 1988 |
| B & H Windows Limited | Construction | 2007 |
| B and S PVT Limited | Administrative & support | 2024 |
| B G Smalley & Sons Limited | Construction | 2006 |
| B H J Rolph Limited | Construction | 2003 |
| B&B Retail Ltd | Wholesale & retail | 2025 |
| B&J Investment Ltd | Real estate | 2025 |
| B&N Personell Ltd | Other services | 2016 |
| B2 Tyres Ltd | Other services | 2025 |
| B4S Property Limited | Real estate | 2026 |
| Baconhair Ltd | Professional & scientific | 2021 |
| Badger Bespoke Gardens Limited | Administrative & support | 2021 |
| Badshot LEA Football Club Ltd | Arts & recreation | 2013 |
| Bageshwor Ltd | Hospitality | 2023 |
| Baggage Solutions Limited | Information & communication | 2008 |
| Bagley Homes Limited | Households | 2018 |
| Bagshot Radiator Services Limited | Administrative & support | 2004 |
| Baguette Studios Ltd | Extraterritorial | 2024 |
| Bahm Properties Ltd | Real estate | 2025 |
| Bajeko Sekuwa Aldershot (UK) Limited | Hospitality | 2025 |
| Bajra Construction Ltd | Construction | 2024 |
| Bajwa Distributors Ltd | Wholesale & retail | 2021 |
| Baker Oldfield Limited | Financial services | 2009 |
| Bakers of Maybury Limited | Wholesale & retail | 1978 |
| Balaju Enterprises Ltd | Wholesale & retail | 2013 |
| Bambootech Ltd | Professional & scientific | 2025 |
| Banapati Limited | Hospitality | 2026 |
| Bani Edem Construction Services Limited | Construction | 2015 |
| Baniya Family Group Limited | Hospitality | 2025 |
| Bankers Mortgage Ltd | Professional & scientific | 2005 |
| Bantha Cleaning Ltd Ltd | Administrative & support | 2025 |
| Barahsinghe UK Ltd | Wholesale & retail | 2025 |
| Barbie Nail Spa Limited | Other services | 2025 |
| Baristas Coffee House and Bistro Limited | Professional & scientific | 2011 |
| Baron Trans Limited | Transport & logistics | 2025 |
| BAS Kumari Ltd | Health & social care | 2022 |
| Base Construction Ltd | Administrative & support | 2024 |
| Battersea UK Developments Limited | Construction | 2020 |
| Bavan & Co Limited | Wholesale & retail | 2009 |
| BB Property Services Limited | Construction | 2016 |
| BCH Naturals Ltd | Manufacturing | 2018 |
| BE Cyber Aware Ltd | Information & communication | 2024 |
| BEA Antonella Ltd | Health & social care | 2015 |
| Beacon Limited | Real estate | 2018 |
| Bear Sports Ltd | Arts & recreation | 2019 |
| Beating Rhythm Manchester Limited | Wholesale & retail | 1993 |
| Beau Beau Limited | Hospitality | 2015 |
| Beaumont Shutters and Blinds Limited | Construction | 2015 |
| Beck Property Holdings Limited | Real estate | 2016 |
| Bedroom Craft Limited | Manufacturing | 2014 |
| Beds N Furniture Limited | Wholesale & retail | 2012 |
| Beechnut Electrical Limited | Energy | 2014 |
| Beleaf Ltd | Wholesale & retail | 2013 |
| Believe in Goodness (BG) Care Home Ltd | Health & social care | 2026 |
| Believe in Goodness (BG) Care Ltd | Health & social care | 2024 |
| Bella Bébé Ltd | Wholesale & retail | 2023 |
| Bella Grounds Limited | Administrative & support | 2022 |
| Belladerm Clinic Ltd | Other services | 2023 |
| Benjess Properties Limited | Real estate | 2020 |
| Bennett Care Corporation Ltd | Health & social care | 2025 |
| Bennett Care Hampshire Ltd | Health & social care | 2024 |